Impoundments Cap Design Specifications by cityofindepmo

SECTION 011000 SUMMARY PART 1 - GENERAL 1.

SUMMARY A.

This Section includes the following: 1.

Work covered by the Contract Documents.

Use of premises.

Specification formats and conventions.

WORK COVERED BY CONTRACT DOCUMENTS A.

Project Identification: Blue Valley Power Station Ash Impoundment Closure 1. Project Location:

21500 E Truman Rd Independence, Missouri 64056

OWNER: City of Independence OWNER's Representative:

Jessica Fett, Production Engineer City of Independence Power & Light Department P.O. Box 1019 21500 E. Truman Road

Design Professional:

SCS Aquaterra 7311 West 130th Street, Ste. 100 Overland Park, Kansas 66213

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Section 011000 Summary BVPS Ash Impoundment Closure

Statement of Work: The scope of work for the City of Independence, Blue Valley Power Station Ash Impoundment Closure is to close three former ash impoundments, containing Coal Combustion Residuals (CCR), in accordance with Section 257.100 of CFR 40 Part 257. The Blue Valley Power station contains three ash impoundments totaling approximately 38.5 acres. The original impoundments, built in 1978, consisted of the South Fly Ash Pond (13.9 acres) and the Bottom Ash Pond (7.9 acres). In 1978, the North Fly Ash Pond was built. The 16.7 acre North Fly Ash impoundment is located to the north of the other ash ponds, and is separated from the south ponds by a drainage ditch that drains storm water from a portion of the power plant site and from properties to the west of the power plant through outfall 004 at the eastern edge of the facility boundary. Storm water and sluice water from the ponds is discharged to the Little Blue Valley Sewer District (LBVSD) through a discharge structure (i.e., outfall 002) located in the southeast corner of the Bottom Ash Pond. The original depth of the ash impoundments was approximately 15 feet, and the depth of ash in the impoundments varies from approximately 2 to 15 feet. To close the CCR impoundments in accordance with Section 257.100: • •

the ash and any liner soils must be removed from the impoundments (Clean Closure), or the ash impoundment can be closed in place by: 1) capping the ash in a manner that minimizes post closure infiltration of liquids into the ash or the release of CCR, leachate, or contaminated runoff to the ground, surface waters, or air; 2) preventing the probability of future impoundment of water; 3) includes measures to prevent a slope failure or movement of the cover system; and 4) minimizes the need for further maintenance of the CCR unit. 5) Prior to installing the cap, a. free liquids must be eliminated by removing liquid waste and solidifying the remaining wastes, and b. the remaining waste must be stabilized sufficiently to support the final cap system. 6) The cap must meet the following requirements:

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Section 011000 Summary BVPS Ash Impoundment Closure

a. b. c. d.

The permeability of the cap must be less than or equal to the bottom layer or underlying natural soil (1x10-7 cm/sec), The thickness of the compacted soil in the barrier soil layer must be a minimum of 18 inches of earthen material, An erosion layer capable of sustaining native plant growth must be a minimum thickness of 6 inches, and The cap must be designed to minimize settlement and subsidence.

7) An alternate cap meeting the requirements of item 6 above may be used. Alternate caps may include a bentonite geocomposite liner (GCL), a bentonite backed geomembrane liner or other materials, if approved by the owner. The Blue Valley Power Station Ash Impoundment Closure Design and technical specifications were developed to achieve the closure of the ash ponds in accordance with Section 257.100 while minimizing the required regrading of CCR (CCR cannot be moved from the pond in which it is currently located to another on site pond) and providing the Closure Contractor the latitude to construct the cap in accordance with the federal regulations in the most cost effective manner possible given the equipment and capabilities of each contractor. The Contractors can choose between the earthen cap or one of the alternate caps. No earthen materials for construction of the cap are located on the site, and the Contractor will be responsible for securing the barrier soil (if applicable), topsoil, and riprap from an offsite source. The existing berms will be cut down as part of the cap grading plan, and excavated soil can be used as general fill, or as barrier soil or Sed Basin liner, if it meets the permeability and soil characteristic requirements for the barrier soil layer or Sed Basin liner. Non-impacted berm soils can be used at any location for any purpose if the berm soil meets the requirements of the area of intended use. The non-impacted soils can be moved into any of the CCR impoundments or disposed off site if unneeded in the closure. CCR, the Sed Basin liners (if applicable), and soil impacted by the CCR cannot be moved outside of the impoundment footprint in which the materials are currently located or disposed off site. The gravel on the existing roads may be removed and stockpiled for reestablishing access roads on the cap as shown on the drawings. The design drawings show the bottom of cap grades for the impoundment cap. The slope of the cap is generally one percent (1%). The technical specifications and this scope of work are written to provide latitude in the

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Section 011000 Summary BVPS Ash Impoundment Closure

elevation of the cap as long as the slopes are generally in the 1% range, the cap drains to the discharge points, potential ponding is eliminated, and obvious high points in the cap are not visible. The existing CCR is expected to be variable in strength, grain size, and moisture content, and the bidders are expected to conduct sufficient testing to evaluate the stability of the CCR under the loads imposed by the equipment to be used to construct the cap and the need for dewatering of the CCR as necessary to complete construction of the cap. The ash impoundments are located on alluvial soils of the Little Blue River and generally consist of 30 to 50 feet of silty clay and clay overlying shale bedrock. Boring logs and geotechnical testing from the design of the 1978 ash ponds is available to the bidders. Installation of a dewatering system may be necessary to stabilize the CCR sufficiently to allow for construction of the cap. If dewatering is necessary, the well points shall not penetrate into the clay soils underlying the ash, and the dewatering system shall be removed before construction of the cap. No portion of the Contractor dewatering system shall penetrate the final cap. Water generated by the dewatering system and plant discharge water will be discharged to the LBVSD through either the existing storm water pond (currently the bottom ash pond), the new sedimentation basin, or temporary sedimentation tanks provided by the Contractor. The installation of a well point system in the areas of the cap excavated is shown on the drawings. The well point hydrostatic pressure control system will be required to control hydrostatic pressures on the underside of the cap following completion of the cap construction which may develop due to water remaining in the CCR. A riprap layer has been located above the cap drainage areas to prevent erosion and to provide additional weight of the cap to resist hydrostatic uplift pressure on the underside of the cap. The south portion of the bottom ash pond will be closed under the “Clean Closure” rule so the Contractor can build a new storm water sedimentation basin (Sed Basin) for the plant. The clean closure will require the relocation of ash from the new basin area to the north end of the bottom ash pond. The Contractor will remove the ash from the footprint of the new Sed Basin down to the underlying clay soil. As the ash is removed to expose the underlying soils, the Design Professional will sample the underlying clay soils to determine if a liner is present, and to what depth, the underlying clay liner will be excavated and stockpiled for testing by the owner. The Contractor should anticipate a delay of approximately two (2) weeks in the schedule between the removal of the ash from the footprint of the Sed Basin and the start of the removal of the liner/impacted clay process.

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Section 011000 Summary BVPS Ash Impoundment Closure

Following the removal of the ash, liner (if present), and soils impacted by the CCR, the Contractor shall begin construction of the new Sed Basin. The new Sed Basin will have a six inch liner system constructed from the clay soil present in the bottom of the Sed Basin after the completion of the clean closure, from excavated soil (tested by the owner by the owner and determined to be clean, or from other berm soils that meet the liner requirements (existing berm soils). As part of the Sed Basin construction, the Contractor shall make repairs to the inlet pipe to the existing discharge structure, relocate the coal yard pipe inlet to the Sed Basin, remove the existing concrete structure and the piping in the southwest corner of the Sed Basin as part of the clean closure and extend the existing pipe into the Sed Basin after the clean closure, and seal the piping from the Bottom Ash pond discharge structure in the north end of the pond and demolish the structure as shown on the Drawings. The Contractor shall seal the remaining pipes in the former pump house, demolish the building if present, and fill in the foundation to create a gravel parking area as shown on the Drawings. Presently, the bottom ash pond is used as a settling basin for plant runoff and storm water falling on the CCR impoundments. The storm water flows by gravity to the LBVSD from the ponds. During the construction of the Sed Basin and the ash grading, the Contractor will be required to handle, including pumping if necessary), all storm water, including the plant discharge water, either in the north portion of the bottom ash pond, via temporary storage in frac tanks, or by alternate means selected by the contractor. Water that contacts ash must either be treated or pumped to the LBVSD discharge pipe. The Contractor is responsible for obtaining the required permit for the capping of the site and for complying with the terms of the of the Missouri Department of Natural Resources (MDNR) Non-Point Discharge Elimination System (NPDES) Land Disturbance General Permit. As part of the Land Disturbance General Permit, the Contractor will be required to update the project Storm Water Pollution Prevention Plan (SWPPP) describing the procedures and best management practices (BMPs) the Contractor will employ to prevent impacted storm water runoff from the site or a Project Erosion Control Plan (PECP). Compliance with applicable permits, including documentation, and reporting is the responsibility of the Contractor. E. 3.

Project will be constructed under a single prime contract. USE OF PREMISES

General: Contractor shall have full use of ash pond areas for construction operations during the construction period. IPL will mow and maintain areas of the ash ponds not affected by the construction. The Contractor shall

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Section 011000 Summary BVPS Ash Impoundment Closure

cooperate with IPL maintenance crews. Contractor's use of other portions of the plant will be as approved by the Owner’s Representative. SPECIFICATION FORMATS AND CONVENTIONS

4. A.

Specification Format: The Specifications are organized into Divisions and Sections using the 49-division format and the Construction Specifications Institute’s "Master Format" numbering system. 1.

Division 01: Sections in Division 01 govern the execution of the Work of all Sections in the Specifications.

Specification Content: The Specifications use certain conventions for the style of language and the intended meaning of certain terms, words, and phrases when used in particular situations. These conventions are as follows: 1.

Abbreviated Language: Language used in the Specifications and other Contract Documents is abbreviated. Words and meanings shall be interpreted as appropriate. Words implied, but not stated, shall be inferred as the sense requires. Singular words shall be interpreted as plural, and plural words shall be interpreted as singular where applicable as the context of the Contract Documents indicates.

Imperative mood and streamlined language are generally used in the Specifications. Requirements expressed in the imperative mood are to be performed by Contractor. Occasionally, the indicative or subjunctive mood may be used in the Section Text for clarity to describe responsibilities that must be fulfilled indirectly by Contractor or by others when so noted. a.

The words "shall," "shall be," or "shall comply with," depending on the context, are implied where a colon (:) is used within a sentence or phrase.

PART 2 – PRODUCTS Not Used PART 3 - EXECUTION Not Used END OF SECTION

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SECTION 012010 MEASUREMENT AND PAYMENT PART 1 – GENERAL 1.1

SUMMARY A. This Section includes requirements for measurement and payment for items listed on the bid. The bid form includes line items for unit prices and lump sum prices.

1.2

DEFINITIONS A. Unit price is an amount stated on the Bid Form, as a price per unit of measurement for materials or services added to or deducted from the Contract Sum by appropriate modification, if estimated quantities of Work required by the Contract Documents are increased or decreased. B. Lump sum is an amount stated on the Bid Form, as the total price for the materials or services described in the measurement and payment item description, specified in the project manual, and indicated on the Construction Drawings.

1.3 A.

MEASUREMENT AND PAYMENT ITEM DESCRIPTIONS General 1. Mobilization/Demobilization includes: materials, equipment, and labor

required for equipment mobilization/demobilization, project management, submittals, construction reports, field office, sanitary facilities, waste services, utilities (e.g., water, electricity, phone), temporary roads and paved areas, site enclosure fence, barricades and warning signs, protection of vegetation, dust and pollution control, final cleaning, project closeout, and record documents. Payment for Mobilization/Demobilization will be lump sum, with 40% of the fee after mobilization, 30% after earning 25% of the original contract amount and 100% after achieving substantial completion. 2. Storm Water/Erosion Controls includes: Provide controls (silt fence, mulch,

socks) as determined necessary to comply with the General Permit, SWPPP or project erosion control plan. Additionally, includes inspections and maintenance of controls. Payment for Storm Water/Erosion Controls will be lump sum on a percent complete basis. 3. Provide Construction Quality Assurance includes: materials, equipment, and

labor required to conduct testing, and submit reports specified. A separate

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Section 012010 Measure and Payment BVPS Ash Impoundment Closure

payment for Construction testing will not be made. B.

Final Cover System 1. Provide and Install the bid cover system includes: materials, equipment, and

labor required to grade the CCR to the required contours, provide and install the barrier layer including placement, tie-in to existing berms, regrading existing berms, seaming and repairs, the vegetative layer, and seeding, but not riprap. Payment for the final cover system will be lump sum, and the riprap and cap roadways will be the unit price for each square foot of riprap or roadway. PART 2 - PRODUCTS Not Used PART 3 - EXECUTION Not Used END OF SECTION

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SECTION 013100 PROJECT MANAGEMENT AND COORDINATION PART 1 - GENERAL 1.1 A.

1.2 A. 1.3 A.

SUMMARY This Section includes administrative provisions for coordinating construction operations on the Project including, but not limited to, the following: 1.

Project meetings.

Requests for Interpretation (RFIs).

See Section 017300, Execution, for procedures for coordinating general installation and field-engineering services, including establishment of benchmarks and control points. DEFINITIONS RFI: Request from Contractor seeking interpretation or clarification of documents. COORDINATION Coordination: Coordinate construction operations included in different Sections of the Specifications to ensure efficient and orderly installation of each part of the Work. Coordinate construction operations, included in different Sections that depend on each other for proper installation, connection, and operation. 1.

Prepare memoranda for distribution to each party involved, outlining special procedures required for coordination. Include such items as required notices, reports, and list of attendees at meetings. 1.

Schedule construction operations in sequence required to obtain the best results where installation of one part of the Work depends on installation of other components, before or after its own installation.

Prepare similar memoranda for Owner and separate contractors if coordination of their Work is required.

Administrative Procedures: Coordinate scheduling and timing of required administrative procedures with other construction activities to avoid conflicts and to ensure orderly progress of the Work. Such administrative activities include, but are not limited to, the following: 1.

Preparation of Contractor's Construction Schedule 013100 - 1

Section 013100 Project Management and Coordination BVPS Ash Impoundment Closure

1.4 A.

Preparation of the Schedule of Values

Installation and removal of temporary facilities and controls

Delivery and processing of submittals

Progress meetings

Project closeout activities

PROJECT MEETINGS General: Schedule and conduct meetings and conferences at Project site, unless otherwise indicated. 1.

Attendees: Inform participants and others involved, and individuals whose presence is required, of date and time of each meeting. Notify Owner’s Representative and Design Professional of scheduled meeting dates and times.

Agenda: Prepare the meeting agenda. Distribute the agenda to all invited attendees.

Minutes: Record significant discussions and agreements achieved. Distribute the meeting minutes to everyone concerned, including Owner’s Representative and Design Professional, within five days of the meeting.

Preconstruction Conference: Schedule a preconstruction conference before starting construction, at a time convenient to Owner’s Representative and Design Professional, but no later than 15 days after execution of the Agreement. Hold the conference at Project site or another convenient location. Conduct the meeting to review responsibilities and personnel assignments. 1.

Attendees: Authorized representatives of Owner’s Representative, Design Professional, and their consultants; Contractor and its superintendent; major subcontractors; suppliers; and other concerned parties shall attend the conference. All participants at the conference shall be familiar with Project and authorized to conclude matters relating to the Work.

Agenda: Discuss items of significance that could affect progress, including the following: a.

Tentative construction schedule

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3. C.

Critical work sequencing and long-lead items

Designation of key personnel and their duties

Procedures for processing field decisions and Change Orders

Procedures for RFIs

Procedures for testing and inspecting

Procedures for processing Applications for Payment

Distribution of the Contract Documents

Submittal procedures

Preparation of Record Documents

Use of the premises

Work restrictions

Owner's occupancy requirements

Responsibility for temporary facilities and controls

Construction waste management and recycling

Parking availability

Office, work, and storage areas

Equipment deliveries and priorities

Health and Safety

Security

Progress cleaning

Working hours

Minutes: Design Professional will record and distribute meeting minutes.

Progress Meetings: Conduct progress meetings at a minimum of monthly intervals or as needed to address significant issues. 1.

Attendees: In addition to representatives of Owner’s Representative and Design Professional, each contractor, subcontractor, supplier, and

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Section 013100 Project Management and Coordination BVPS Ash Impoundment Closure

other entity concerned with current progress or involved in planning, coordination, or performance of future activities shall be represented at these meetings. All participants at the conference shall be familiar with Project and authorized to conclude matters relating to the Work. 2.

Agenda: Review and correct or approve minutes of previous progress meeting. Review other items of significance that could affect progress. Include topics for discussion as appropriate to status of Project. a.

Contractor's Construction Schedule: Review progress since the last meeting. Determine whether each activity is on time, ahead of schedule, or behind schedule, in relation to Contractor's Construction Schedule. Determine how construction behind schedule will be expedited; secure commitments from parties involved to do so. Discuss whether schedule revisions are required to ensure that current and subsequent activities will be completed within the Contract Time. 1)

Review schedule for next period.

Review present and future needs of each entity present, including the following: 1)

Interface requirements

Sequence of operations

Status of submittals

Deliveries

Access

Site utilization

Temporary facilities and controls

Work hours

Hazards and risks

10)

Progress cleaning

11)

Quality and work standards

12)

Status of correction of deficient items

13)

Field observations

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Section 013100 Project Management and Coordination BVPS Ash Impoundment Closure

RFIs

15)

Status of proposal requests

16)

Pending changes

17)

Status of Change Orders

18)

Pending claims and disputes

19)

Documentation of information for payment requests

Minutes: Record the meeting minutes.

Reporting: Distribute minutes of the meeting to each party present and to parties who should have been present. a.

1.5

14)

Schedule Updating: Revise Contractor's Construction Schedule after each progress meeting where revisions to the schedule have been made or recognized. Issue revised schedule concurrently with the report of each meeting.

REQUESTS FOR INTERPRETATION (RFIs) Procedure: Immediately on discovery of the need for interpretation of the Contract Documents, and if not possible to request interpretation at Project meeting, prepare and submit an RFI in the form specified. 1.

RFIs shall originate with Contractor. RFIs submitted by entities other than Contractor will be returned with no response.

Coordinate and submit RFIs in a prompt manner so as to avoid delays in Contractor's work or work of subcontractors.

Content of the RFI: Include a detailed, legible description of item needing interpretation and the following: 1.

Project name

Date

Name of Contractor

Name of Design Professional

RFI number, numbered sequentially

Specification Section number and title and related paragraphs, as

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Section 013100 Project Management and Coordination BVPS Ash Impoundment Closure

appropriate

Drawing number and detail references, as appropriate

Field dimensions and conditions, as appropriate

Contractor's suggested solution(s). If Contractor's solution(s) impact the Contract Time or the Contract Sum, Contractor shall state impact in the RFI.

10.

Contractor's signature

11.

Attachments: Include drawings, descriptions, measurements, photos, Product Data, Shop Drawings, and other information necessary to fully describe items needing interpretation.

Hard-Copy RFIs: 1.

Identify each page of attachments with the RFI number and sequential page number.

Design Professional's Action: Design Professional will review each RFI, determine action required, and return it. Allow seven working days for Design Professional's response for each RFI. RFIs received after 1:00 p.m. will be considered as received the following working day. 1.

The following RFIs will be returned without action: a.

Requests for approval of submittals

Requests for approval of substitutions

Requests for coordination information already indicated in the Contract Documents

Requests for adjustments in the Contract Time or the Contract Sum

Requests for interpretation of Design Professional's actions on submittals

Incomplete RFIs or RFIs with numerous errors

Design Professional's action may include a request for additional information, in which case Design Professional's time for response will start again.

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Section 013100 Project Management and Coordination BVPS Ash Impoundment Closure

Design Professional's action on RFIs that may result in a change to the Contract Time or the Contract Sum may be eligible for Contractor to submit Change Order Proposal according to Division 01 Section "Change Order." a.

If Contractor believes the RFI response warrants change in the Contract Time or the Contract Sum, notify Design Professional in writing within 10 days of receipt of the RFI response.

On receipt of Design Professional's action, update the RFI log and immediately distribute the RFI response to affected parties. Review response and notify Design Professional within seven days if Contractor disagrees with response.

RFI Log: Prepare, maintain, and submit a tabular log of RFIs organized by the RFI number. Submit log monthly. Include the following: 1.

Project name.

Name and address of Contractor.

Name and address of Design Professional.

RFI number including RFIs that were dropped and not submitted.

RFI description.

Date the RFI was submitted.

Date Design Professional's response was received.

Identification of related Field Order, Work Change Directive, and Proposal Request, as appropriate.

PART 2 – PRODUCTS Not Used PART 3 – EXECUTION Not Used END OF SECTION

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SECTION 013200 CONSTRUCTION PROGRESS DOCUMENTATION PART 1 - GENERAL 1.1 A.

B. 1.2 A.

1.3 A.

SUMMARY This Section includes administrative and procedural requirements for documenting the progress of construction during performance of the Work, including the following: 1.

Contractor's Construction Schedule.

Submittals Schedule.

Daily construction reports.

Field condition reports.

See General Conditions for submitting the Schedule of Values. DEFINITIONS Activity: A discrete part of a project that can be identified for planning, scheduling, monitoring, and controlling the construction project. Activities included in a construction schedule consume time and resources. 1.

Critical activities are activities on the critical path. They must start and finish on the planned early start and finish times.

Predecessor Activity: An activity that precedes another activity in the network.

Successor Activity: An activity that follows another activity in the network.

SUBMITTALS Submittals Schedule: Submit three copies of schedule. Arrange the following information in a tabular format: 1.

Scheduled date for first submittal.

Specification Section number and title.

Submittal category (action or informational).

Name of subcontractor.

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Section 013200 Construction Progress Documentation BVPS Ash Impoundment Closure

Description of the Work covered.

Scheduled date for Design Professional's final release or approval.

Contractor's Construction Schedule: Submit three copies of initial schedule, large enough to show entire schedule for entire construction period. 1.

Submit an electronic copy of schedule, using software indicated, on CDR, and labeled to comply with requirements for submittals. Include type of schedule (Initial or Updated) and date on label.

Daily Construction Reports: Submit electronic copies at weekly intervals. The project distribution list will be provided after the award.

Field Condition Reports: Submit three copies at time of discovery of differing conditions.

1.4

COORDINATION

Coordinate preparation and processing of schedules and reports with performance of construction activities and with scheduling and reporting of separate contractors.

Coordinate Contractor's Construction Schedule with the Schedule of Values, list of subcontracts, Submittals Schedule, progress reports, payment requests, and other required schedules and reports. 1.

Secure time commitments for performing critical elements of the Work from parties involved.

Coordinate each construction activity in the network with other activities and schedule them in proper sequence.

PART 2 - PRODUCTS 2.1 A.

SUBMITTALS SCHEDULE Preparation: Submit a Submittal Schedule, arranged in chronological order by dates required by construction schedule. Include time required for review, resubmittal, ordering, manufacturing, fabrication, and delivery when establishing dates. 1.

Coordinate Submittals Schedule with list of subcontracts, the Schedule of Values, and Contractor's Construction Schedule.

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Section 013200 Construction Progress Documentation BVPS Ash Impoundment Closure

2. 2.2 A.

CONTRACTOR'S CONSTRUCTION SCHEDULE, GENERAL Time Frame: Extend schedule from date established for the Notice of Award to date of Final Completion. 1.

Submit concurrently with the first complete submittal of Contractor's Construction Schedule.

Contract completion date shall not be changed by submission of a schedule that shows an early completion date, unless specifically authorized by Change Order.

Activities: Treat each work item or separate area as a separate numbered activity for each principal element of the Work. Comply with the following: 1.

Activity Duration: Define activities so no activity is longer than 30 days, unless specifically allowed by Design Professional.

Procurement Activities: Include procurement process activities for the following long lead items and major items, requiring a cycle of more than 60 days, as separate activities in schedule. Procurement cycle activities include, but are not limited to, submittals, approvals, purchasing, fabrication, and delivery.

Submittal Review Time: Include review and resubmittal times indicated in Section 013300, Submittal Procedures, in schedule. Coordinate submittal review times in Contractor's Construction Schedule with Submittals Schedule.

Substantial Completion: Indicate completion in advance of date established for Substantial Completion, and allow time for Design Professional's administrative procedures necessary for certification of Substantial Completion.

Constraints: Include constraints and work restrictions indicated in the Contract Documents and as follows in schedule, and show how the sequence of the Work is affected. 1.

Phasing: Arrange list of activities on schedule by phase.

Milestones: Include milestones indicated in the Contract Documents in schedule, including, but not limited to, the Notice to Proceed, Substantial Completion, and Final Completion.

Contract Modifications: For each proposed contract modification and concurrent with its submission, prepare a time-impact analysis to demonstrate the effect of the proposed change on the overall project schedule.

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Section 013200 Construction Progress Documentation BVPS Ash Impoundment Closure

2.3 A.

CONTRACTOR'S CONSTRUCTION SCHEDULE (GANTT CHART) Gantt-Chart Schedule: Submit a comprehensive, fully developed, horizontal Gantt-chart- type, Contractor's Construction Schedule within 30 days of date established for the Notice to Proceed. Base schedule on the Preliminary Construction Schedule and whatever updating and feedback was received since the start of Project.

Preparation: Indicate each significant construction activity separately. Identify first workday of each week with a continuous vertical line. 1.

2.4 A.

For construction activities that require 3 months or longer to complete, indicate an estimated completion percentage in 10 percent increments within time bar.

REPORTS Daily Construction Reports: Prepare a daily construction report recording the following information concerning events at Project site: 1.

List of subcontractors at Project site.

Equipment at Project site.

Material deliveries.

High and low temperatures and general weather conditions.

Accidents.

Stoppages, delays, shortages, and losses.

Field Condition Reports: Immediately on discovery of a difference between field conditions and the Contract Documents, prepare and submit a detailed report. Submit with a request for interpretation. Include a detailed description of the differing conditions, together with recommendations for changing the Contract Documents.

PART 3 - EXECUTION 3.1 A.

CONTRACTOR'S CONSTRUCTION SCHEDULE Contractor's Construction Schedule Updating: At monthly intervals, update schedule to reflect actual construction progress and activities. Issue schedule one week before each regularly scheduled progress meeting.

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Section 013200 Construction Progress Documentation BVPS Ash Impoundment Closure

Revise schedule immediately after each meeting or other activity where revisions have been recognized or made. Issue updated schedule concurrently with the report of each such meeting.

Include a report with updated schedule that indicates every change, including, but not limited to, changes in logic, durations, actual starts and finishes, and activity durations.

As the Work progresses, indicate Actual Completion percentage for each activity.

Distribution: Distribute copies of approved schedule to Design Professional, Owner’s Representative, separate contractors, testing and inspecting agencies, and other parties identified by Contractor with a need-to-know schedule responsibility. 1.

Post copies in Project meeting rooms and temporary field offices.

When revisions are made, distribute updated schedules to the same parties and post in the same locations. Delete parties from distribution when they have completed their assigned portion of the Work and are no longer involved in performance of construction activities. END OF SECTION

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SECTION 013300 SUBMITTAL PROCEDURES PART 1 - GENERAL 1.1

SUMMARY

This Section includes administrative and procedural requirements for submitting Shop Drawings, Product Data, Samples, and other submittals.

See Section 013200, Construction Progress Documentation, for submitting schedules and reports, including Contractor's Construction Schedule.

See Section 014000, Quality Requirements, for submitting test and inspection reports.

See Section 017839, Project Record Documents, for submitting Record Drawings, Record Specifications, and Record Product Data.

1.2

DEFINITIONS

Action Submittals: Written and graphic information that requires Design Professional's response.

Informational Submittals: Written information that does not require Design Professional's response. Submittals may be rejected for not complying with requirements.

1.3 A.

SUBMITTAL PROCEDURES Coordination: Coordinate preparation and processing of submittals with performance of construction activities. 1.

Coordinate each submittal with fabrication, purchasing, testing, delivery, other submittals, and related activities that require sequential activity.

Coordinate transmittal of different types of submittals for related parts of the Work so processing will not be delayed because of need to review submittals concurrently for coordination. a.

Design Professional reserves the right to withhold action on a submittal requiring coordination with other submittals until related submittals are received.

Submittals Schedule: Comply with requirements in Section 013200, Construction Progress Documentation, for list of submittals and time requirements for scheduled performance of related construction activities.

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

Processing Time: Allow enough time for submittal review, including time for resubmittals, as follows. Time for review shall commence on Design Professional's receipt of submittal. No extension of the Contract Time will be authorized because of failure to transmit submittals enough in advance of the Work to permit processing, including resubmittals. 1.

Initial Review: Allow 10 days for initial review of each submittal. Allow additional time if coordination with subsequent submittals is required. Design Professional will advise Contractor when a submittal being processed must be delayed for coordination.

Intermediate Review: If intermediate submittal is necessary, process it in same manner as initial submittal.

Resubmittal Review: Allow 10 days for review of each resubmittal.

Identification: Place a permanent label or title block on each submittal for identification. 1.

Indicate name of firm or entity that prepared each submittal on label or title block.

Provide a space approximately 4 by 6 inches on label or beside title block to record Contractor's review and approval markings and action taken by Design Professional.

Include the following information on label for processing and recording action taken: a.

Project name.

Date.

Name and address of Design Professional.

Name and address of Contractor.

Name and address of subcontractor.

Name and address of supplier.

Name of manufacturer.

Submittal number or other unique identifier, including revision identifier. 1)

Submittal number shall use Specification Section number followed by a decimal point and then a sequential number

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

(e.g., 061000.01). Resubmittals shall include an alphabetic suffix after another decimal point (e.g., 061000.01.A). i.

Number and title of appropriate Specification Section.

Drawing number and detail references, as appropriate.

Location(s) where product is to be installed, as appropriate.

Other necessary identification.

Deviations: Highlight, encircle, or otherwise specifically identify deviations from the Contract Documents on submittals.

Additional Copies: Unless additional copies are required for final submittal, and unless Design Professional observes noncompliance with provisions in the Contract Documents, initial submittal may serve as final submittal.

Transmittal: Package each submittal individually and appropriately for transmittal and handling. Transmit each submittal using a transmittal form. Design Professional will return submittals, without review, received from sources other than Contractor.

Resubmittals: Make resubmittals in same form and number of copies as initial submittal. 1.

Note date and content of previous submittal.

Note date and content of revision in label or title block and clearly indicate extent of revision.

Resubmit submittals until they are marked "Approved" or "Approved as Noted."

Distribution: Furnish copies of final submittals to manufacturers, subcontractors, suppliers, fabricators, installers, authorities having jurisdiction, and others as necessary for performance of construction activities. Show distribution on transmittal forms.

Use for Construction: Use only final submittals with mark indicating "Approved" or "Approved as Noted " taken by Design Professional.

013300 - 3

Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

PART 2 - PRODUCTS 2.1

ACTION SUBMITTALS

General: Prepare and submit Action Submittals required by individual Specification Sections.

Product Data: Collect information into a single submittal for each element of construction and type of product or equipment. 1.

If information must be specially prepared for submittal because standard printed data are not suitable for use, submit as Shop Drawings, not as Product Data.

Mark each copy of each submittal to show which products and options are applicable.

Include the following information, as applicable:

Manufacturer's written recommendations.

Manufacturer's product specifications.

Manufacturer's installation instructions.

Manufacturer's catalog cuts.

Compliance with specified referenced standards.

Testing by recognized testing agency.

Number of Copies: Submit three copies of Product Data, unless otherwise indicated. Design Professional will return two copies. Mark up and retain one returned copy as a Project Record Document.

Shop Drawings: Prepare Project-specific information, drawn accurately to scale. Do not base Shop Drawings on reproductions of the Contract Documents or standard printed data. 1.

Preparation: Fully illustrate requirements in the Contract Documents. Include the following information, as applicable: a.

Dimensions.

Identification of products.

Fabrication and installation drawings.

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

Templates and patterns.

Schedules.

Notation of coordination requirements.

Notation of dimensions established by field measurement.

Relationship to adjoining construction clearly indicated.

Seal and signature of professional engineer if specified.

Sheet Size: Except for templates, patterns, and similar full-size drawings, submit Shop Drawings on sheets at least 8-1/2 by 11 inches but no larger than 24 by 36 inches.

Product Schedule or List: As required in individual Specification Sections, prepare a written summary indicating types of products required for the Work and their intended location. 1.

Number of Copies: Submit three copies of product schedule or list, unless otherwise indicated. Design Professional will return two copies.

Submittals Schedule: Comply with requirements specified in Section 013200, Construction Progress Documentation.

Application for Payment: Comply with requirements specified in General Conditions.

Schedule of Values: Comply with requirements specified in General Conditions.

2.2 A.

INFORMATIONAL SUBMITTALS General: Prepare and submit Informational Submittals required by other Specification Sections. 1.

Number of Copies: Submit two copies of each submittal, unless otherwise indicated. Design Professional will not return copies.

Certificates and Certifications: Provide a notarized statement that includes signature of entity responsible for preparing certification. Certificates and certifications shall be signed by an officer or other individual authorized to sign documents on behalf of that entity.

Test and Inspection Reports: Comply with requirements specified in Section 014000, Quality Requirements.

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

Contractor's Construction Schedule: Comply with requirements specified in Section 013200, Construction Progress Documentation.

Qualification Data: Prepare written information that demonstrates capabilities and experience of firm or person. Include lists of completed projects with project names and addresses, names and addresses of design professionals and owners, and other information specified.

Manufacturer Certificates: Prepare written statements on manufacturer's letterhead certifying that manufacturer complies with requirements in the Contract Documents. Include evidence of manufacturing experience where required.

Product Certificates: Prepare written statements on manufacturer's letterhead certifying that product complies with requirements in the Contract Documents.

Material Certificates: Prepare written statements on manufacturer's letterhead certifying that material complies with requirements in the Contract Documents.

Material Test Reports: Prepare reports written by a qualified testing agency, on testing agency's standard form, indicating and interpreting test results of material for compliance with requirements in the Contract Documents.

Product Test Reports: Prepare written reports indicating current product produced by manufacturer complies with requirements in the Contract Documents. Base reports on evaluation of tests performed by manufacturer and witnessed by a qualified testing agency, or on comprehensive tests performed by a qualified testing agency.

Preconstruction Test Reports: Prepare reports written by a qualified testing agency, on testing agency's standard form, indicating and interpreting results of tests performed before installation of product, for compliance with performance requirements in the Contract Documents.

Field Test Reports: Prepare reports written by a qualified testing agency, on testing agency's standard form, indicating and interpreting results of field tests performed either during installation of product or after product is installed in its final location, for compliance with requirements in the Contract Documents.

Manufacturer's Instructions: Prepare written or published information that documents manufacturer's recommendations, guidelines, and procedures for installing or operating a product or equipment. Include name of product and name, address, and telephone number of manufacturer.

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

Insurance Certificates and Bonds: Prepare written information indicating current status of insurance or bonding coverage. Include name of entity covered by insurance or bond, limits of coverage, amounts of deductibles, if any, and term of the coverage.

PART 3 - EXECUTION 3.1

CONTRACTOR'S REVIEW

Review each submittal and check for coordination with other Work of the Contract and for compliance with the Contract Documents. Note corrections and field dimensions. Mark with approval stamp before submitting to Design Professional.

Approval Stamp: Stamp each submittal with a uniform, approval stamp. Include Project name and location, submittal number, Specification Section title and number, name of reviewer, date of Contractor's approval, and statement certifying that submittal has been reviewed, checked, and approved for compliance with the Contract Documents.

3.2

DESIGN PROFESSIONAL'S ACTION

General: Design Professional will not review submittals that do not bear Contractor's approval stamp and will return them without action.

Action Submittals: Design Professional will review each submittal, make marks to indicate corrections or modifications required, and return it. Design Professional will stamp each submittal with an action stamp and will mark stamp appropriately to indicate action taken, as follows: 1.

Approved,

Approved as Noted,

Resubmit, or

Disapproved

The submittal stamp also will include the following statement: “Review of this document has been made only for conformance with the design concept of the project and approval or disapproval as noted shall not relieve the Contractor from responsibility for any errors therein or for furnishing the materials and equipment of proper dimension, size, quantity, quality, and all performance characteristics to meet the requirement and intent of the contact document.”

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Section 013300 Submittal Procedures BVPS Ash Impoundment Closure

Informational Submittals: Design Professional will review each submittal and will not return it, or will return it if it does not comply with requirements. Design Professional will forward each submittal to appropriate party.

Partial submittals are not acceptable, will be considered nonresponsive, and will be returned without review.

Submittals not required by the Contract Documents may not be reviewed and may be discarded. END OF SECTION

013300 - 8

SECTION 014000 QUALITY REQUIREMENTS PART 1 - GENERAL 1.1

SUMMARY

This Section includes administrative and procedural requirements for quality assurance and quality control to be completed by the Contractor and the Owner. The Contractor shall document the construction of his work using this section. Unless testing is specifically called out as being performed by the Owner, it is assumed the Contractor’s CQC staff will perform the testing

Testing and inspecting services are required to verify compliance with requirements specified or indicated. Testing completed within this section by the Owner does not relieve the Contractor of responsibility for compliance with the Contract Document requirements.

C. 1.2

Specified tests, inspections, and related actions do not limit Contractor's other quality assurance/quality control (QA/QC) procedures that facilitate compliance with the Contract Document requirements.

Requirements for Contractor to provide quality assurance and quality control services required by Design Professional, Owner’s Representative, or authorities having jurisdiction are not limited by provisions of this Section.

See Divisions 02 through 43 Sections for specific test and inspection requirements. DEFINITIONS

Constructions Quality Assurance (CQA): A planned system of activities by the Contractor that provides the Owner assurance that the facility was constructed as specified in the design. CQA includes inspections, verifications, audits, and evaluations of materials and workmanship necessary to determine and document the quality of the constructed facility. CQA refers to the measures taken by the Contractor or installer is in compliance with the CCR Closure rules and construction drawings and technical specifications for a project. Services do not include contract enforcement activities performed by the Design Professional.

CQA Manager: A professional engineer retained by the Contractor to provide on-site construction oversight, quality assurance testing, and a final report demonstrating that the requirements of permit requirements and construction drawings and technical specifications have been met.

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Section 014000 Quality Requirements BVPS Ash Impoundment Closure

Construction Quality Control (CQC): A planned system of inspections that is used to directly monitor and control the quality of a construction project. CQC is normally performed by the Contractor and is necessary to achieve quality in the constructed or installed system. CQC refers to measures taken by the Contractor or installer to determine compliance with the requirements for material and workmanship as stated in the plans and specifications for the project.

Preconstruction Testing: Tests and inspections that are performed specifically for the Project before products and materials are incorporated into the Work to verify performance or compliance with specified criteria.

Product Testing: Tests and inspections that are performed by a National Recognized Testing Laboratory (NRTL), a National Voluntary Laboratory Accreditation Program (NVLAP), or other testing agency qualified to conduct product testing and acceptable to authorities having jurisdiction, to establish product performance and compliance with industry standards.

Source QA/QC Testing: Tests and inspections that are performed at the source, i.e., borrow area, plant, mill, factory, or shop.

Field QA/QC Testing: Tests and inspections that are performed on-site for installation of the Work and for completed Work.

Testing Agency: An entity engaged to perform specific tests, inspections, or both. Testing laboratory shall mean the same as testing agency.

Installer/Applicator/Erector: Contractor or another entity engaged by Contractor as an employee, Subcontractor, or Sub-subcontractor, to perform a particular construction operation, including installation, erection, application, and similar operations. 1.

1.3 A.

Using a term such as "carpentry" does not imply that certain construction activities must be performed by accredited or unionized individuals of a corresponding generic name, such as "carpenter." It also does not imply that requirements specified apply exclusively to tradespeople of the corresponding generic name.

CONFLICTING REQUIREMENTS General: If compliance with two or more standards is specified and the standards establish different or conflicting requirements for minimum quantities or quality levels, comply with the most stringent requirement. Refer uncertainties and requirements that are different, but apparently equal, to Design Professional for a decision before proceeding.

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Section 014000 Quality Requirements BVPS Ash Impoundment Closure

1.4

Minimum Quantity or Quality Levels: The quantity or quality level shown or specified shall be the minimum provided or performed. The actual installation may comply exactly with the minimum quantity or quality specified, or it may exceed the minimum within reasonable limits. To comply with these requirements, indicated numeric values are minimum or maximum, as appropriate, for the context of requirements. Refer uncertainties to Design Professional for a decision before proceeding. SUBMITTALS

Qualification Data: For testing agencies as specified to demonstrate their capabilities and experience. Include proof of qualifications in the form of a recent report on the inspection of the testing agency by a recognized authority.

Reports: Prepare and submit certified written reports that include the following:

Date of issue.

Project title and number.

Name, address, and telephone number of testing agency.

Dates and locations of samples and tests or inspections.

Names of individuals making tests and inspections.

Description of the Work and test and inspection method.

Identification of product and Specification Section.

Complete test or inspection data.

Test and inspection results and an interpretation of test results.

10.

Record of temperature and weather conditions at time of sample taking and testing and inspecting.

11.

Comments or professional opinion on whether tested or inspected Work complies with the Contract Document requirements.

12.

Name and signature of laboratory inspector.

13.

Recommendations on retesting and reinspecting.

Permits, Licenses, and Certificates: For Owner's records, submit copies of permits, licenses, certifications, inspection reports, releases, jurisdictional

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Section 014000 Quality Requirements BVPS Ash Impoundment Closure

settlements, notices, receipts for fee payments, judgments, correspondence, records, and similar documents, established for compliance with standards and regulations bearing on performance of the Work. 1.5

QUALIFICATIONS

General: Contractor shall provide a CQA Manager and specific CQC inspectors trained to document the completed work.

General: Qualifications paragraphs in this section establish the minimum qualification levels required; individual Specification Sections specify additional requirements.

Installer Qualifications: A firm or individual experienced in installing, erecting, or assembling work similar in material, design, and extent to that indicated for this Project, whose work has resulted in construction with a record of successful in-service performance.

Manufacturer Qualifications: A firm experienced in manufacturing products or systems similar to those indicated for this Project and with a record of successful in-service performance, as well as sufficient production capacity to produce required units.

Fabricator Qualifications: A firm experienced in producing products similar to those indicated for this Project and with a record of successful in-service performance, as well as sufficient production capacity to produce required units.

Testing Agency Qualifications: An NRTL, an NVLAP, or an independent agency with the experience and capability to conduct testing and inspecting indicated, as documented according to ASTM E 548; and with additional qualifications specified in individual Sections; and where required by authorities having jurisdiction, that is acceptable to authorities.

NRTL: A nationally recognized testing laboratory according to 29 CFR 1910.7.

NVLAP: A testing agency accredited according to NIST's National Voluntary Laboratory Accreditation Program.

Factory-Authorized Service Representative Qualifications: An authorized representative of manufacturer who is trained and approved by manufacturer to inspect installation of manufacturer's products that are similar in material, design, and extent to those indicated for this Project.

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Section 014000 Quality Requirements BVPS Ash Impoundment Closure

1.6 A.

QA/QC Owner Responsibilities: Where QA/QC services are indicated as Owner's responsibility, Owner will engage a qualified testing agency to perform these services. 1.

Owner will furnish Contractor with names, addresses, and telephone numbers of testing agencies engaged and a description of types of testing and inspecting they are engaged to perform.

Costs for retesting and reinspecting construction that replaces or is necessitated by work that failed to comply with the Contract Documents will be charged to Contractor.

Tests and inspections not explicitly assigned to Owner are Contractor's responsibility. Unless otherwise indicated, provide quality-control services specified. 1.

Where services are indicated as Contractor's responsibility, engage a qualified testing agency to perform these quality control services. a.

Contractor shall not employ same entity engaged by Owner, unless agreed to in writing by Owner.

Notify testing agencies at least 24 hours in advance of time when Work that requires testing or inspecting will be performed.

Where QA/QC services are indicated as Contractor's responsibility, submit a certified written report, in duplicate, of each QA/QC service.

Testing and inspecting requested by Contractor and not required by the Contract Documents are Contractor's responsibility.

Submit additional copies of each written report directly to authorities having jurisdiction, when they so direct.

Manufacturer's Field Services: Where indicated, engage a factoryauthorized service representative to inspect field-assembled components and equipment installation, including service connections. Report results in writing as specified in Section 013300, Submittal Procedures.

Retesting/Reinspecting: Regardless of whether original tests or inspections were Contractor's responsibility, provide QA/QC services, including retesting and reinspecting, for construction that replaced Work that failed to comply with the Contract Documents.

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Section 014000 Quality Requirements BVPS Ash Impoundment Closure

Testing Agency Responsibilities: Cooperate with Design Professional and Contractor in performance of duties. Provide qualified personnel to perform required tests and inspections. 1.

Notify Design Professional and Contractor promptly of irregularities or deficiencies observed in the Work during performance of its services.

Determine the location from which test samples will be taken and in which in-situ tests are conducted.

Conduct and interpret tests and inspections and state in each report whether tested and inspected work complies with or deviates from requirements.

Submit a certified written report, in duplicate, of each test, inspection, and similar QA/QC service through Contractor.

Do not release, revoke, alter, or increase the Contract Document requirements or approve or accept any portion of the Work.

Do not perform any duties of Contractor.

Associated Services: Cooperate with agencies performing required tests, inspections, and similar QA/QC services, and provide reasonable auxiliary services as requested. Notify agency sufficiently in advance of operations to permit assignment of personnel. Provide the following: 1.

Access to the Work.

Incidental labor and facilities necessary to facilitate tests and inspections.

Adequate quantities of representative samples of materials that require testing and inspecting. Assist agency in obtaining samples.

Facilities for storage and field curing of test samples.

Coordination: Coordinate sequence of activities to accommodate required quality-assurance and quality-control services with a minimum of delay and to avoid necessity of removing and replacing construction to accommodate testing and inspecting. 1.

Schedule times for tests, inspections, obtaining samples, and similar activities.

PART 2 - PRODUCTS Not Used 014000 - 6

Section 014000 Quality Requirements BVPS Ash Impoundment Closure

PART 3 - EXECUTION 3.1 A.

REPAIR AND PROTECTION General: On completion of testing, inspecting, sample taking, and similar services, repair damaged construction and restore substrates and finishes. 1.

Provide materials and comply with installation requirements specified in other Specification Sections. Restore patched areas and extend restoration into adjoining areas with durable seams that are as invisible as possible.

Protect construction exposed by or for quality-control service activities.

Repair and protection are Contractor's responsibility, regardless of the assignment of responsibility for quality-control services. END OF SECTION

014000 - 7

SECTION 015713 TEMPORARY EROSION AND SEDIMENT CONTROLS PART 1 GENERAL 1.1

SUMMARY

This Section includes requirements for temporary erosion and sediment controls to ensure protection of adjacent and downstream surface water and drainage facilities. The Contractor shall provide all labor, materials, tools, equipment, and services necessary for the placement of temporary, biodegradable Type I and II Erosion Control Material (ECM) for side slopes, non-biodegradable ECM for swales, etc. as required to comply with the required permits.

Contractor is responsible for complying with the storm water discharges associated with construction activity under Missouri National Pollutant Discharge Elimination System (NPDES) General Permit No. MO-RA.

The Contractor is responsible for determination of the controls to use and compliance with the SWPPP and the NPDES General Permit for Storm Water Discharges Associated with Construction Activity.

1.2

SUBMITTALS

Submit a Project Erosion Control Plan (or updated SWPPP) detailing the scope and procedures to be implemented to comply with the MDNR NPDES permit and to prevent ash from entering water courses.

Submit six copies of manufacturer data, specifications, dimensions and installation instructions for erosive soils and high runoff velocities.

Submit six copies of an affidavit certifying that each ECM furnished complies with all requirements specified herein.

No ECM shall be shipped until the affidavit is submitted to CQC Manager.

1.3 A.

SPECIAL REQUIREMENTS In addition to appropriate permit and/or SWPPP requirements, construction procedures shall include protection of the environment in accordance with all pertinent federal, state, and local regulations. Prohibited construction procedures in the undertaking of work associated with this Project include, but are not limited to:

015713 - 1

Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

Discharging storm water that has contacted ash or water from dewatering operations.

Pumping of silt-laden water from trenches or other excavations into any surface waters, stream corridors, or any wetlands.

Damaging vegetation beyond the extent necessary for the Work.

Disposal of trees, brush, and other debris in any stream corridors, any wetlands, or within the 100-year floodplain of any surface waters.

Dumping of spoil material into any stream corridor, any wetlands, any surface waters, or at any unspecified or unapproved locations.

Open burning of any debris.

Upon acceptance by the Owner of the PECP or updated SWPPP, the Contractor shall implement, maintain and update the PECP or SWPPP, as necessary.

The Contractor shall not be permitted to begin construction activities in any area until erosion and sediment control measures have been installed for all areas potentially affected by said construction.

1.4 A.

PRODUCT DELIVERY, STORAGE AND HANDLING Delivery of Materials: 1.

Deliver packaged materials in original, unopened containers showing weight, analysis and name of manufacturer. Protect materials from deterioration during delivery.

Notify Design Professional of delivery schedule in advance so materials may be inspected upon arrival at Site.

Remove unacceptable material immediately from Site.

Storage of Materials: Store and cover materials to prevent deterioration. Remove packaged materials which show deterioration or damage from the Site. Replace at no further cost to the Owner.

015713 - 2

Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

PART 2 - PRODUCTS 2.1

2.2

GENERAL A.

The Contractor shall provide all necessary supervision, labor, equipment and materials as needed to perform the specified work.

Materials shall include silt fence, straw bales, or other manufactured products to reduce erosion and control siltation as specified in the Contract Documents.

Stakes shall not be used in any area where installation of the stakes will damage underlying materials (e.g., underground utilities, geosynthetics). Any damage caused by the installation of stakes shall be immediately reported to the Owner’s Representative and the damage shall be remedied to the satisfaction of the Owner’s Representative at no additional cost to the Owner.

SILT FENCE A.

2.3

Posts shall be steel or 1.5-inch square hardwood: 1.

Hardwood and 6-foot spacing, if wire fence backing is not used.

Steel and 10-foot spacing, if wire fence backing is used.

Wire fence backing for reinforced silt fence shall be woven wire, 14 gauge, with 6-inch maximum mesh opening.

Geotextile filter cloth sizing shall be as recommended by the manufacturer. The material shall have a tensile strength of 120 pounds if wire fence backing is used and 200 pounds if wire fence backing is not used.

STRAW BALES A.

Straw bales shall be bound with wire or nylon.

1.5-inch square wooden stakes (two per bale) at least 4 feet long, shall be driven through the straw bale and into the underlying soil.

Straw bales shall be free from noxious weeds and shall weigh approximately 40 pounds with a moisture content of not greater than 15 percent when delivered to the Site.

015713 - 3

Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

PART 3 - EXECUTION 3.1

INSTALLATION, GENERAL A.

Locate erosion and sediment controls where they will serve Project adequately and result in minimum interference with performance of the Work. Relocate and modify controls as required by progress of the Work.

Do not remove until controls are no longer needed or are replaced by completed permanent site stabilization controls.

3.2

EROSION AND SEDIMENT CONTROLS A.

Clearing and Site Preparation - Only those portions of the Site necessary and essential to be cleared for Work shall be cleared. Clearing schedules shall be formulated to provide minimum particle exposure of soils, and shall include sufficient detail for performance by the Contractor in separate construction areas. Local storm water run-on/run-off control measures shall be implemented as conditions warrant. The Contractor shall make every reasonable effort so as to not unduly disturb the ecological or environmental quality of the area.

Erosion and Sediment Control 1.

During the land disturbance life of the Project, the following order related to implementation of erosion and sedimentation controls shall be adhered to: a.

Clearing and grubbing for those areas necessary for installation of perimeter erosion and sediment controls.

Installation of perimeter erosion and sediment controls.

Remaining area clearing and grubbing.

Perform construction work, providing temporary stabilization/ erosion/run-on/run-off controls as required.

Final grading and installation of permanent erosion and sediment controls.

Removal of perimeter erosion and sediment controls.

Sediment and erosion control measures may include straw bale dikes, silt fences, earth dikes, stone outlet sediment traps, construction entrances, riprap, seeding/sodding, properly anchored mulch, and/or other measures as required.

015713 - 4

Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

Sediment and erosion control measures shall be properly maintained and adequately functioning. Any existing measures that are damaged shall be immediately repaired.

Excavated material shall be protected from erosion by using appropriate devices or stabilization.

Trapped sediment shall be removed from the area of deposition and returned to its point of origin.

As soon as possible after disturbance of a graded area, slope stabilization through the use of mulches (wood chips or straw anchored appropriately) or matting shall be provided.

Silt Fence - Where reinforced silt fence is not used, filter fabric shall be stapled to the posts. In all areas, fabric shall be keyed six inches into a trench. The trench shall be backfilled with material reserved from excavation, after installation of the silt fence has been completed.

Straw Bales and Straw Wattles - Where straw bales and straw wattles are used, they shall be placed in a trench 2 inches deep. If placed in a drainage way to prevent migration of sediment, the first bale shall be placed in the center. Two stakes shall be used for each bale and a minimum of 10 stakes for each wattle. The first stake shall be placed at a 30 degree angle with the stake driven towards the adjacent bale. The Contractor shall not drive stakes closer than 12 inches to any geosynthetic, underground utility or other feature sensitive to penetration. 1.

Hold the number and size of areas of bare soil or waste exposed at one time to a minimum.

Provide temporary control measures such as mulch socks, silt fences, etc., as specified in the SWPPP and as directed by the Owner’s Representative.

Maintain erosion and sediment control measures to the satisfaction of the Design Professional and remove them only when the site is appropriately stabilized, as determined by the Owner’s Representative.

Periodically inspect earthwork to detect any evidence of the start of erosion, and apply corrective measures as required to control erosion.

Erosion and sediment control structure locations may be added and adjusted at the discretion of the Contractor throughout the construction period.

At minimum, the qualified inspector shall inspect all erosion and sediment control practices to ensure integrity and effectiveness, all permanent storm

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Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

water control features already constructed, all areas of disturbance that have not achieved final stabilization, and all points of discharge from the Site. I.

Inspect erosion and sediment control structures in accordance with one of the following schedules, as per the Missouri General Permit: 1.

At least once every 7 calendar days

At least once every 14 calendar days and within 24 hours of the end of a storm event of 0.50 inches or greater (a rain gauge must be installed and maintained onsite).

Within one business day of the completion of an inspection, the Contractor (or Contractor’s subcontractor) shall begin implementing the corrective actions within one business day of this notification and shall complete the corrective actions in a reasonable time frame.

All inspection reports shall be signed by the Contractor. The Contractor shall maintain the inspection reports on-site with the SWPPP and shall submit them electronically on the day prepared to the Owner and Design Professional.

Remove excess, accumulated sediments from the control structures and transport the sediment to its original location.

Remove temporary erosion and sediment controls:

3.2

When the need for the controls has ended and site stabilization is achieved.

At completion of the Project.

MAINTENANCE

Silt fences shall be maintained as needed throughout the life of the Project to control sediment migration to the satisfaction of the Owner’s Representative. Sediment materials shall be removed when bulges develop in the silt fence as directed by the Owner’s Representative.

Straw bale dikes shall be inspected weekly and cleaned and/or replaced promptly as directed by the Owner’s Representative throughout the life of the Project.

As required by the Owner’s Representative to control erosion and/or sedimentation, erosion control devices in addition to those specified in the SWPPP shall be installed by the C during construction at no additional cost to the Owner.

015713 - 6

Section 015713 Temporary Erosion and Sediment Controls BVPS Ash Impoundment Closure

Sediment shall be removed from sediment traps or sediment basins whenever their capacity has been reduced by fifty (50) percent from the design capacity. Prior to demobilization, storm water basins including swales or channels that lead into the storm water basins must be restored to their pre-construction condition or better, as established in the pre-construction Site assessment, and as specified in the Technical Specifications. END OF SECTION

015713 - 7

SECTION 015719 TEMPORARY ENVIRONMENTAL CONTROLS PART 1 - GENERAL 1.1

SUMMARY

This section specifies the control of environmental pollution and damage the Contractor must consider for air, water, and land resources. It includes management of visual aesthetics, noise, solid waste, radiant energy, and radioactive materials, as well as other pollutants and resources encountered or generated by the Contractor. The Contractor is obligated to consider specified control measures with the costs included within the various contract items of work.

Environmental pollution and damage is defined as the presence of chemical, physical, or biological elements or agents which: 1.

Adversely affect human health or welfare,

Unfavorably alter ecological balances of importance to human life,

Effect other species of importance to humankind, or;

Degrade the utility of the environment for aesthetic, cultural, and historical purposes.

Waste Materials: No waste or eroded materials shall be allowed to enter natural or man-made water or sewage removal systems. Eroded materials from excavations, borrow areas, or stockpiled fill shall be contained within the Work area.

Definitions of Pollutants: 1.

Chemical Waste: Petroleum products, bituminous materials, salts, acids, alkalis, herbicides, pesticides, organic chemicals, and inorganic wastes.

Debris: Combustible and noncombustible wastes, such as leaves, tree trimmings, ashes, and waste materials resulting from construction or maintenance and repair work.

Sediment: Soil and other debris that has been eroded and transported by runoff water.

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Section 015719 Temporary Environmental Controls BVPS Ash Impoundment Closure

1.2 A.

Solid Waste: Rubbish, debris, garbage, and other discarded solid materials resulting from industrial, commercial, and agricultural operations and from community activities.

Surface Discharge: The term "Surface Discharge" implies that the water is discharged with possible sheeting action and subsequent soil erosion may occur. Waters that are surface discharged may terminate in drainage ditches, storm sewers, creeks, and/or "water of the United States" and would require a permit to discharge water from the governing agency.

Rubbish: Combustible and noncombustible wastes such as paper, boxes, glass and crockery, metal and lumber scrap, tin cans, and bones.

SUBMITTALS Prior to the start of any construction activities submit: 1.

A detailed proposal of all methods of control and preventive measures to be utilized for environmental protection.

A Drawing of the work area, haul routes, storage areas, access routes and current land conditions including trees and vegetation.

A pollution prevention plan.

Miscellaneous Submittals. 1.

Weekly copies of monitoring and maintenance records showing compliance with the Storm Water Pollution Prevention Plan (SWPPP).

PART 2 PRODUCTS Not Used PART 3 EXECUTION 3.1

INSTALLATION

A. Employ and utilize environmental protection methods, obtain all necessary permits, and fully observe all local, state, and federal regulations including those related to documentation of environmental compliance.

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Section 015719 Temporary Environmental Controls BVPS Ash Impoundment Closure

B. Land Protection: 1.

Except for any work or storage area and access routes specifically assigned for the use of the Contractor, the land areas outside the limits of construction shall be preserved in their present condition. The Contractor shall take care that construction equipment does not track ash onto roads outside of the pond foot print.

Contractor shall confine his construction activities to areas defined for work within the Contract Documents.

Manage and control all borrow areas, work or storage areas, access routes and embankments to prevent sediment from entering nearby water or land adjacent to the work site.

Restore all disturbed areas including borrow and haul areas and establish permanent type of locally adaptable vegetative cover.

Protect all side slopes and backslopes immediately upon completion of final grading.

Plan and execute earthwork in a manner to minimize duration of exposure of unprotected soils.

Except for areas designated by the Contract Documents to be cleared and grubbed, the Contractor shall not deface, injure or destroy trees and vegetation, nor remove, cut, or disturb them without approval of the Owner’s Representative or Design Professional. Any damage caused by the Contractor's equipment or operations shall be restored as nearly as possible to its original condition at the Contractor's expense.

A. Surface Water Protection: 1.

Utilize, as necessary and specified, erosion control methods to protect side and backslopes, minimize the discharge of sediment to the surface water leaving the construction site as soon as rough grading is complete. These controls shall be maintained until the site is ready for final grading and seeding or until they are no longer warranted and concurrence is received from the Design Professional. Physically retard the rate and volume of run-on and runoff by: a. Implementing structural practices such as diversion swales, terraces, straw bales, silt fences, berms, storm drain inlet protection, rocked outlet protection, sediment traps and temporary basins. b. Implementing vegetative practices such as temporary seeding,

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Section 015719 Temporary Environmental Controls BVPS Ash Impoundment Closure

permanent seeding, mulching, vegetative buffers, hydroseeding, anchored erosion control blankets, vegetated swales or a combination of these methods. c. Providing Construction sites with graveled or rocked access entrance and exit drives and parking areas to reduce the tracking of sediment onto public or private roads. 2.

The Contractor shall prevent erosion of excavated areas, embankments, stockpiled earth materials, and other erodible areas, and shall provide control of runoff sediment from siltation and pollution of the drainage systems.

Prevent erosion of excavated areas, embankments, stockpiled earth materials, and other erodible construction areas, and prevent pollution of drainage systems by diversion of storm runoff around construction activities or by trapping or retaining sediment delivered by storm runoff.

Provide control of construction operations so excessive sediment or siltation shall not be introduced into the drainage systems from storm runoff.

Discharges from the construction site shall not contain pollutants at concentrations that produce objectionable films, colors, turbidity, deposits or noxious odors in the receiving stream or waterway.

B. Solid Waste Disposal: 1.

Collect solid waste on a daily basis.

Provide disposal of degradable solid waste to an approved solid waste disposal site.

Provide disposal of nondegradable solid waste to an approved solid waste disposal site or in an alternate manner approved by Design Professional and regulatory agencies.

No demolition or construction materials wastes or unused materials shall be burned, buried, dumped, or otherwise disposed of on the site.

C. Fuel and Chemical Handling: 1.

Store and dispose of chemical wastes in a manner approved by regulatory agencies.

Take special measures to prevent chemicals, fuels, oils, greases, herbicides, and insecticides from entering drainage ways.

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Section 015719 Temporary Environmental Controls BVPS Ash Impoundment Closure

Do not allow water used in onsite material processing, cleanup, and other wastewaters to enter a drainage way(s) or stream.

The Contractor shall provide containment around fueling and chemical storage areas to ensure spills in these areas do not reach waters of the state. Containment shall be constructed and operating in accordance with applicable local laws

D. Control of Dust: 1.

The control of dust shall mean no construction activity shall take place without applying all such reasonable measures as may be required to prevent particulate matter from becoming airborne so that it remains visible beyond the limits of construction. Reasonable measures may include paving, frequent road cleaning, planting vegetative groundcover, application of water or application of chemical dust suppressants. The use of chemical agents such as calcium chloride must be approved by the Owner’s Representative. a.

At a minimum, Contractor shall apply water to all Work area roads daily when rain is not imminent.

During all grading and soil work activities, Contractor shall maintain a minimum of one water truck on-site for dust control.

Cost for dust control shall be incidental to all other Work.

Contractor shall also be responsible for maintaining dust control when hauling materials to the construction site.

Contractor shall implement dust control measures if wind and dry soil conditions reduce visibility or cause nuisance dust on adjacent roads or property.

Utilize methods and practices of construction to eliminate dust in full observance of agency regulations.

The Design Professional will determine the effectiveness of the dust control program and may request the Contractor to provide additional measures, at no additional cost to Owner.

E. Burning: 1.

Do not burn material on the site. If the Contractor elects to dispose of waste materials by burning, make arrangements for an off-site burning area and conform to all agency regulations.

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Section 015719 Temporary Environmental Controls BVPS Ash Impoundment Closure

F. Control of Noise: 1.

Control noise by fitting equipment with appropriate mufflers.

Daily construction activities shall be scheduled to minimize disruption of nearby residents.

G. Completion of Work: 1.

Upon completion of work, leave area in a clean, natural looking condition.

Ensure all signs of temporary construction and activities incidental to construction of required permanent work are removed. END OF SECTION

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SECTION 017300 EXECUTION PART 1 - GENERAL 1.1 A.

SUMMARY This Section includes general procedural requirements governing execution of the Work including, but not limited to, the following: 1.

Construction layout.

Field engineering and surveying.

Progress cleaning.

Protection of installed construction.

Correction of the Work.

Related Sections: 1.

1.2

Section 017700-Closeout Procedures.

SUBMITTALS

Certificates: Submit certificate signed by a Missouri-licensed land surveyor certifying that location and elevation of improvements comply with requirements.

Certified Surveys: Submit three hard copies and one electronic copy (on CD) signed and stamped by an Missouri-licensed land surveyor for the following: 1.

1.3 A.

Base of barrier, top of barrier layer (if applicable), and top of final cover.

Final Property Survey: Submit three hard copies and one electronic copy (on CD) showing the Work performed and record survey data, including elevations of the final, completed landfill cap. QUALIFICATIONS Land Surveyor Qualifications: A professional land surveyor who is legally qualified to practice in jurisdiction where Project is located and who is experienced in providing land- surveying services of the kind indicated.

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PART 2 - PRODUCTS Not Used PART 3 - EXECUTION 3.1 A.

3.2

EXAMINATION Existing Conditions: The existence and location of site improvements, utilities, and other construction indicated as existing are not guaranteed. Before beginning work, investigate and verify the existence and location of underground utilities and other construction affecting the Work. PREPARATION

Existing Utility Information: Furnish information to local utility and Owner that is necessary to adjust, move, or relocate existing utility structures, utility poles, lines, services, or other utility appurtenances located in or affected by construction. Coordinate with authorities having jurisdiction.

Field Measurements: Take field measurements as required to fit the Work properly. Recheck measurements before installing each product.

Review of Contract Documents and field conditions: Immediately on discovery of the need for clarification of the Contract Documents, submit a Request for Information to Design Professional. Include a detailed description of problem encountered, together with recommendations for changing the Contract Documents.

3.3

CONSTRUCTION LAYOUT

Verification: Before proceeding to lay out the Work, verify layout information shown on Drawings, in relation to the property survey and existing benchmarks. If discrepancies are discovered, notify Design Professional promptly.

General: Engage a Missouri-licensed land surveyor to lay out the Work using accepted surveying practices. 1.

Establish benchmarks and control points to set lines and levels as needed to locate each element of Project.

Establish dimensions within tolerances indicated. Do not scale Drawings to obtain required dimensions.

Inform installers of lines and levels to which they must comply.

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Section 017300 Execution BVPS Ash Impoundment Closure

Check the location, level and plumb, of every major element as the Work progresses.

Notify Design Professional when deviations from required lines and levels exceed allowable tolerances.

Site Improvements: Locate and lay out site improvements, including grading, fill and topsoil placement, utility slopes, and invert elevations.

Record Log: Maintain a log of layout control work. Record deviations from required lines and levels. Include beginning and ending dates and times of surveys, weather conditions, name and duty of each survey party member, and types of instruments and tapes used. Make the log available for reference by Design Professional.

3.4

FIELD ENGINEERING

Reference Points: Locate existing permanent benchmarks, control points, and similar reference points before beginning the Work. Preserve and protect permanent benchmarks and control points during construction operations.

Benchmarks: Establish and maintain a minimum of two permanent benchmarks on Project site, referenced to data established by survey control points. Comply with authorities having jurisdiction for type and size of benchmark. 1.

Record benchmark locations, with horizontal and vertical data, on Project Record Documents.

Certified Survey: On completion of subgrade layer, barrier soil layer, and final cap, prepare a certified survey showing dimensions, locations, angles, and elevations of construction and sitework.

Final Property Survey: Prepare a final property survey showing significant features (real property) for Project. Include on the survey a certification, signed by a Missouri-licensed land surveyor, that principal metes, bounds, lines, and levels of Project are accurately positioned as shown on the survey. 1.

Recording: At Substantial Completion, have the final property survey recorded by or with authorities having jurisdiction as the official "property survey."

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3.5

INSTALLATION

General: Locate the Work and components of the Work accurately, in correct alignment and elevation, as indicated.

Comply with manufacturer's written instructions and recommendations for installing products in applications indicated.

Conduct construction operations so no part of the Work is subjected to damaging operations or loading in excess of that expected during normal conditions of occupancy.

Tools and Equipment: Do not use tools or equipment that produce harmful noise levels.

Hazardous Materials: Use products, cleaners, and installation materials that are not considered hazardous.

3.6 A.

PROGRESS CLEANING General: Clean Project site and work areas daily, including common areas. Enforce requirements strictly. Dispose of materials lawfully. 1.

Comply with requirements in NFPA 241 for removal of combustible waste materials and debris.

Do not hold materials more than 7 days during normal weather or 3 days if the temperature is expected to rise above 80 deg F.

Containerize hazardous and unsanitary waste materials separately from other waste. Mark containers appropriately and dispose of legally, according to regulations.

Site: Maintain Project site free of waste materials and debris.

Work Areas: Clean areas where work is in progress to the level of cleanliness necessary for proper execution of the Work. 1.

Remove liquid spills promptly.

Waste Disposal: Burning waste materials on-site will not be permitted. Washing waste materials down sewers or into waterways will not be permitted.

Provide maintenance on completed construction as frequently as necessary through the remainder of the construction period.

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3.7 A. 3.8 A.

Limiting Exposures: Supervise construction operations to assure that no part of the construction, completed or in progress, is subject to harmful, dangerous, damaging, or otherwise deleterious exposure during the construction period. PROTECTION OF CONSTRUCTION Provide final protection and maintain conditions that ensure Work is without damage or deterioration at time of Substantial Completion. CORRECTION OF THE WORK Repair or remove and replace defective construction. Restore damaged substrates. END OF SECTION

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SECTION 017700 CLOSEOUT PROCEDURES PART 1 - GENERAL 1.1 A.

1.2 A.

SUMMARY This Section includes administrative and procedural requirements for contract closeout, including, but not limited to, the following: 1.

Inspection procedures.

Final cleaning.

Related Sections: 1.

General Conditions.

Section 017839-Project Record Documents.

Division 02 through 43 - All Sections.

SUBMITTALS Preliminary Procedures: Before requesting inspection for determining date of Substantial Completion, complete the following. List items below that are incomplete in request. 1.

Prepare a list of items to be completed and corrected (punch list), the value of items on the list, and reasons why the Work is not complete.

Advise Owner of pending insurance changeover requirements.

Prepare and submit Project Record Documents, damage or settlement surveys, property surveys, and similar final record information.

Terminate and remove temporary facilities from Project site, along with construction tools and similar elements.

Complete final cleaning requirements.

Inspection: Submit a written request for inspection for Substantial Completion. On receipt of request, Design Professional will either proceed with inspection or notify Contractor of unfulfilled requirements. Design Professional will prepare the Certificate of Substantial Completion after inspection or will notify Contractor of items, either on Contractor's list or additional items identified by Design Professional, that must be completed or corrected before certificate will be issued.

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Section 017700 Closeout Procedures BVPS Ash Impoundment Closure

1.1 A.

1.2 A.

Reinspection: Request reinspection when the Work identified in previous inspections as incomplete is completed or corrected.

Results of completed inspection will form the basis of requirements for Final Completion.

LIST OF INCOMPLETE ITEMS (PUNCH LIST) Preparation: Submit three copies of list. Include name and identification of each area affected by construction operations for incomplete items and items needing correction including, if necessary, areas disturbed by Contractor that are outside the limits of construction. FINAL COMPLETION Preliminary Procedures: Before requesting final inspection for determining date of Final Completion, complete the following: 1.

Submit a final Application for Payment according to General Conditions.

Submit certified copy of Design Professional's Substantial Completion inspection list of items to be completed or corrected (punch list), endorsed and dated by Design Professional. The certified copy of the list shall state that each item has been completed or otherwise resolved for acceptance.

Submit evidence of final, continuing insurance coverage complying with insurance requirements.

Inspection: Submit a written request for final inspection for acceptance. On receipt of request, Design Professional will either proceed with inspection or notify Contractor of unfulfilled requirements. Design Professional will prepare a final Certificate for Payment after inspection or will notify Contractor of construction that must be completed or corrected before certificate will be issued. 1.

Reinspection: Request reinspection when the Work identified in previous inspections as incomplete is completed or corrected.

PART 2 - PRODUCTS 2.1

MATERIALS Not Applicable

PART 3 - EXECUTION

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3.1

FINAL CLEANING

General: Provide final cleaning. Conduct cleaning and waste-removal operations to comply with local laws and ordinances and Federal and local environmental and antipollution regulations.

Cleaning: Employ experienced workers for final cleaning. 1.

Complete the following cleaning operations before requesting inspection for certification of Substantial Completion for entire Project or for a portion of Project: a.

Clean Project site, yard, and grounds, in areas disturbed by construction activities, including landscape development areas, of rubbish, waste material, litter, and other foreign substances.

Sweep paved areas broom clean. Remove petrochemical spills, stains, and other foreign deposits.

Remove tools, construction equipment, machinery, and surplus material from Project site.

Leave Project clean and ready for occupancy.

Comply with safety standards for cleaning. Do not burn waste materials. Do not bury construction debris or excess materials on Owner's property, except in areas specified in the Contract Documents or approved by Design Professional. Do not discharge volatile, harmful, or dangerous materials into drainage systems. Remove waste materials from Project site and dispose of lawfully. END OF SECTION

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SECTION 017839 PROJECT RECORD DOCUMENTS PART 1 GENERAL 1.1 A.

SUMMARY Section includes administrative and procedural requirements for Project Record Documents, including the following: 1.

Record Drawings.

Record Specifications.

Related Sections: 1.

1.2 A.

Divisions 02 through 43 Sections.

SUBMITTALS Record Drawings: Comply with the following: 1.

Number of Copies: Submit copies of Record Drawings as follows: a.

Final Submittal: Submit one set of marked-up Record Prints, and the following: •

Record CAD Drawing Files and Plots: Two sets.

Record Specifications: Submit one copy of Project's Specifications, including addenda and contract modifications.

PART 2 PRODUCTS 2.1 A.

RECORD DRAWINGS Record Prints: Maintain one set of blue- or black-line white prints of the Drawings and Shop Drawings. 1.

Preparation: Mark Record Prints to show the actual installation where installation varies from that shown originally. Require individual or entity who obtained record data, whether individual or entity is subcontractor or similar entity, to prepare the marked-up Record Prints. a.

Give particular attention to information on concealed elements that would be difficult to identify or measure and record later.

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Section 017839 Project Record Documents BVPS Ash Impoundment Closure

Record data as soon as possible after obtaining it. Record and check the markup before enclosing concealed installations.

Mark the Construction Drawings or Shop Drawings, whichever is most capable of showing actual physical conditions, completely and accurately. If Shop Drawings are marked, show cross-reference on the Construction Drawings.

Mark record sets with erasable, red-colored pencil. Use other colors to distinguish between changes for different categories of the Work at same location.

Note Construction Change Directive numbers, alternate numbers, Change Order numbers, and similar identification, where applicable.

Record CAD Drawings: Immediately before inspection for Certificate of Substantial Completion, review marked-up Record Prints with Design Professional. When authorized, prepare a full set of corrected CAD Drawings of the Construction Drawings, as follows: 1.

Format: AutoCAD Release 2000 or later.

Incorporate changes and additional information previously marked on Record Prints. Delete, redraw, and add details and notations where applicable.

Refer instances of uncertainty to Design Professional for resolution.

Design Professional will furnish Contractor one set of CAD Drawings of the Construction Drawings for use in recording information. a.

Design Professional makes no representations as to the accuracy or completeness of CAD Drawings as they relate to the Construction Drawings.

CAD Software Program: The Drawings are available in AutoCAD 2014 Civil 3D.

C. Format: Identify and date each Record Drawing; include the designation "RECORD DRAWING" in a prominent location. 1.

Record Prints: Organize Record Prints and newly prepared Record Drawings into manageable sets. Bind each set with durable paper cover sheets. Include identification on cover sheets.

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Section 017839 Project Record Documents BVPS Ash Impoundment Closure

2.2 A.

2.3 A.

Record CAD Drawings: Organize CAD information into separate electronic files that correspond to each sheet of the Drawings. Name each file with the sheet identification. Include identification in each CAD file.

Identification: As follows: a.

Project name.

Date.

Designation "PROJECT RECORD DRAWINGS."

Name of Design Professional.

Name of Contractor.

RECORD SPECIFICATIONS Preparation: Mark Specifications to indicate the actual product installation where installation varies from that indicated in Specifications, addenda, and contract modifications. 1.

Give particular attention to information on concealed products and installations that cannot be readily identified and recorded later.

Mark copy with the proprietary name and model number of products, materials, and equipment furnished, including substitutions and product options selected.

Record the name of manufacturer, supplier, Installer, and other information necessary to provide a record of selections made.

Note related Change Orders and Record Drawings where applicable.

MISCELLANEOUS RECORD SUBMITTALS Assemble miscellaneous records required by other Specification Sections for miscellaneous record keeping and submittal in connection with actual performance of the Work. Bind or file miscellaneous records and identify each, ready for continued use and reference.

PART 3 EXECUTION 3.1 A.

RECORDING AND MAINTENANCE Recording: Maintain one copy of each submittal during the construction period for Project Record Document purposes. Post changes and

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modifications to Project Record Documents as they occur; do not wait until the end of Project. B.

Maintenance of Record Documents and Samples: Store Record Documents and Samples in the field office apart from the Contract Documents used for construction. Do not use Project Record Documents for construction purposes. Maintain Record Documents in good order and in a clean, dry, legible condition, protected from deterioration and loss. Provide access to Project Record Documents for Design Professional's reference during normal working hours. END OF SECTION

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SECTION 310513 EARTHWORK PART 1 GENERAL 1.1

1.2

SUMMARY A.

Section includes grading (cutting and fill) of ash or other soils to achieve base of cover grades and the clean closure, excavating existing embankment soils, placement of clay soils for the approved cover, and placement of clay soil in the liner for the Sedimentation Basin (Sed Basin).

Related Sections: 1.

Section 014000 – Quality Requirements: Testing and analysis of soil material.

Section 015713 – Temporary Erosion and Sediment Controls

Section 015719 – Temporary Environmental Controls

Section 311000 – Site Clearing

Section 313700 – Riprap

REFERENCES A.

American Association of State Highway and Transportation Officials: 1.

AASHTO T180 - Standard Specification for Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop.

ASTM International: 1.

ASTM D422 – Standard Test Methods for Particle-Size Analysis of Soils.

ASTM D698 – Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3)).

ASTM D1557 – Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lb/ft3 (2,700 kN-m/m3))

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Section 310513 Earthwork BVPS Ash Impoundment Closure

ASTM D2216 – Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass.

ASTM D2487 – Standard Test Method for Classification of Soils for Engineering Purposes (Unified Soil Classification System).

ASTM D4318 – Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.

ASTM D5084 – Standard Test Method for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible-Wall Permeameter.

ASTM D6938 – Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth).

Environmental Protection Agency (USEPA): 1.

40 CFR Parts 257 and 261 Disposal of Coal Combustion Residuals from Electric Utilities, Final Rule, April 2015

Technical Guidance Document - Quality Assurance and Quality Control for Waste Containment Facilities, EPA/600/R-93/182, September 1993.

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Section 310513 Earthwork BVPS Ash Impoundment Closure

1.3

QUALITY ASSURANCE A. The Contractor shall conduct Quality Assurance/Quality Control testing as necessary to document compliance with the Technical Specifications. The Owner may conduct additional Quality Assurance/Quality Control testing; however, such testing or lack of testing does not relieve the Contractor of the responsibility to comply with the Technical Specifications. B. The Contractor shall be responsible for reworking or removing and replacing nonconforming soil and other construction materials that do not meet the requirements of the Technical Specifications and the Construction Drawings as directed by the Design Professional. C. The Contractor shall be responsible for all survey work required to complete construction in accordance with the required lines and elevations as described in the Technical Specifications and as shown on the Construction Drawings. D. Unless specifically superseded by these Contract Documents or approved plans submitted by the Contractor, the barrier soil layer, Sed Basin liner, and erosion layer shall be prepared, placed, compacted, processed, tested, and protected as described in EPA/600/R-93/182. This includes, but is not necessarily limited to: a. Material selection and prequalification. b. Placement, remolding, and compaction. c. Protection from desiccation, freezing temperatures, and excess surface water. d. Repair of holes. E. The Contractor will perform soils testing as follows: 1. Recompacted Clay Layer (Cap) and Sed BasinLiner: a) Laboratory Testing: 1) Moisture/Density Compaction Curves. 2) Water Content. 3) Atterberg Limits/Plasticity. 4) Percentage Fines.

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5) Percentage Gravel. 6) Maximum Clod or Particle size, if deviation from Specification is suspected. 7) Hydraulic Conductivity. b) Field testing for Quality Assurance: 1) Field compaction and moisture tests on completed portions. 2) Other quality assurance tests as Design Professional deems appropriate. 3) Contractor to pay for failing moisture/density tests. 2. Erosion/Vegetation layer: a) Quality assurance tests as Design Professional deems appropriate.

3. Structural Fills: a) Compaction Curves. b) Field Compaction and Moisture Tests on Finished Products. b) Quality assurance tests as Design Professional deems appropriate. 4. Ash Preparation for Cover Materials a) Compaction Curves. b) Field Compaction 1.4

SUBMITTALS A.

The Contractor shall submit proposed material sources to the Design Professional for approval before construction.

The Contractor shall submit soil test results for fill, barrier soil, Sed Basin liner soil, and topsoil before construction.

The Contractor shall submit Test Pad results for the barrier soil layer for approval prior to construction.

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Laboratory and field tests during construction shall be submitted to the Design Professional within 24 hours of receipt of laboratory data or field test performance.

PART 2 PRODUCTS 2.1

2.2

GENERAL A.

All barrier soil, Sed Basin liner soil, and topsoil will be purchased by the Contractor, and the soils must be approved by the Design Professional prior to transporting to the site.

If the Contractor elects to install the soil cover alternative, the barrier soils in the cover shall consist of clay (CL or CH) which the Contractor can compact to achieve the 1x10-7 cm/sec requirement of the barrier soil layer. Clean clay excavated from the existing embankments may be used as barrier soils or Sed Basin liner soils if the Contractor can compact the clay to achieve the 1x10-7 cm/sec requirement of the barrier soil layer and Sed Basin liner.

The topsoil in the all of the cover alternatives (except for a synthetic turf option) shall consist of friable sandy loam suitable to support the cover vegetation.

Excavated materials from the project construction area may be used as general fill material as directed by the Design Professional.

The final surface of all excavated areas and all areas designated to receive the final cover will be prepared and accepted in accordance with the Technical Specifications. The final surface will also be free of loose material, clods and any other debris including grade stakes and hubs that may impact the integrity of the final cover system.

Natural subgrade soils or compacted fill softened by frost, flooding, weather, or any other natural or man-made events will be removed and replaced or re-compacted in accordance with the requirements specified herein.

Fill will not be placed on snow, ice, or frozen ground surfaces.

STRUCTURAL FILL A.

Structural fill materials will refer to materials used for subgrade construction, the construction of berms, and backfilling trenches.

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Section 310513 Earthwork BVPS Ash Impoundment Closure

2.3

Structural fill shall be tested for laboratory compaction by ASTM D698 prior to construction in locations where compaction specifications are applicable.

Structural fill materials for the Sed Basin divider berm shall be obtained from the existing ash impoundment embankments or other source obtained by the Contractor.

The bottom ash pond liner, if present, can be used as structural fill within the north half of the Sed Basin divider berm or as structural fill in the bottom ash pond. The clay excavated from the Bottom Ash Pond will be stockpile by the contractor and tested by the Owner to determine if the the soil is non-impacted and can be used as liner or barrier soils.

Ash can only be moved within the pond in which the ash is currently located and cannot be moved from one pond to another pond.

Structural fill materials will be free of debris, roots, organic matter, frozen matter, roots, wood, peat, cinders, rubbish, stones having any dimension greater than two (2) inches or any other deleterious materials.

BARRIER SOIL AND SED BASIN LINER MATERIALS A.

Barrier soil materials will refer to materials used for the construction of the infiltration barrier soil layer in the soil cap alternative. Sed Basin liner soil refers to the clay liner to be installed on the base and side slopes of the new Sed Basin.

Barrier soil and Sed Basin liner materials will be moisture conditioned and installed by the Contractor and tested to verify compliance with the Technical Specifications.

It is anticipated that Contractor will be required to purchase all of the barrier soil and Sed Basin liner soils from an offsite source.

Barrier Soil Fill and Sed Basin Liner Fill: Soil Classification: Groups ML, CL, or CH according to ASTM D 2487, or a combination of these groups. Rock/gravel fragments larger than 1/2-inch in diameter may not be used as barrier soil fill. Barrier soil fill shall have fines content of soil (material passing a #200 sieve) greater than 70 percent. Soils shall have a Plasticity Index (PI) greater than 25, and material greater than the #4 sieve must compose less than 7 percent of soil by weight. Soil clods must be less than 4 inches.

Required Performance: Hydraulic Conductivity less than or equal to 1x10-7 cm/sec (ASTM D5048).

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Section 310513 Earthwork BVPS Ash Impoundment Closure

2.4

A test pad shall be constructed for purposes of demonstrating level of compaction and moisture content required to achieve specified hydraulic conductivity.

Test/demonstration shall be performed for each soil type used in the barrier clay liner construction

TOPSOIL MATERIALS A.

Topsoil shall consist of friable sandy loam with soil particles within the following percentages: clay 0-25; silt 25-50; sand 40-60; decomposed organic matter 5-10 and reasonably free of grass, roots, weeds sticks, stones and other foreign materials. 1. No rocks larger than 1-inch in diameter 2. Maximum sand content of 60 percent. 3. Classified as CL, ML, or OL. 4. Maximum liquid limit of 40 percent. 5. pH range of 5.4 to 7.9.

B. 2.5

It is anticipated that Contractor will be required to purchase all of the topsoil from an offsite source.

SOURCE QUALITY CONTROL A.

Testing and Analysis of Structural Fill: Perform in accordance with ASTM D698.

Testing and Analysis of Barrier Soil and Sed Basin Liner Soil 1. Barrier and Liner soil fill taken at the borrow source during preconstruction testing shall be tested at the rate of one test per every 20,000 cubic yards of material, or more frequently if visual observations indicate a change in material characteristics, or deemed so by the geotechnical technician. Soil from the borrow source shall be tested before transportation to the landfill site. 2. Bulk sample testing shall include: a. Moisture Content (ASTM D854) b. Particle Size (ASTM D1140, D442)

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Section 310513 Earthwork BVPS Ash Impoundment Closure

c. Atterberg Limits (ASTM D4318) d. Laboratory Compaction (ASTM D698) e. Laboratory Hydraulic Conductivity at a specified compaction (ASTM D5084) C.

Testing and Analysis of Topsoil Material: Perform in accordance with ASTM D422 and testing by an agricultural testing laboratory for nitrogen, phosphorus, potash, soluble salt content, organic matter content, and pH.

PART 3 EXECUTION 3.1

SITE EXCAVATION AND GRADING A.

Call Local Utility Line Information service not less than three working days before performing Work. Perform preparation and protection of utilities in accordance with Section 311000 – Site Clearing.

Access to poles for the transmission line crossing the area to be maintained throughout the project.

The clean closure of the south end of the bottom ash pond will be completed in the general manner described below: 1. The contractor shall establish a method to treat (sedimentation) the water currently treated in the Bottom Ash Pond and discharged to the LBVSD. The method may include using one of the other ash ponds, a portion of the Bottom Ash Pond, sedimentation tanks, or an alternate method proposed by the Contractor. 2. The bottom ash within the footprint of the proposed Sed Basin shall be removed down to natural soil and either placed in the north end of the Bottom Ash or stockpile if the north end of the Bottom Ash Pond is used as a temporary sedimentation basin. 3. After the native soil is exposed and the ash removed from the soil surface, the contractor will excavate a total of ten test pits to a depth of 4-feet to allow the Design Profession to determine if there is a clay liner under the pond that requires removal under the CCR regulations. The Design Professional will collect samples of the native soil to determine the additional excavation depth and whether the

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Section 310513 Earthwork BVPS Ash Impoundment Closure

excavated soil can be used as structural fill or if the soil must be disposed in the north end of the bottom ash pond. 4. The test pitting will begin as the ash is removed and the underlying soil is exposed; however the contractor should plan on a two week delay following the complete exposure of the clean closure surface and the decision on whether a liner is present and if additional soil excavation is required. 5. If additional soil excavation is required, the contractor will stockpile the native clay soil for possible additional testing to determine if the soil is impacted or can be used as liner material for the Sed Basin. 6. A divider berm between the bottom ash to be cap and the proposed Sed Basin will be constructed as shown on the drawings. The south half of the berm must be constructed with clean clay while impacted clays can be placed in the north half of the berm. 7. A six inch clay liner will be installed on the base and side slopes of the proposed Sed Basin. If the soils under the proposed Sed Basin are suitable for liner material, the Contractor can .deep disc the soils to a minimum depth of 8 inches, moisture condition the soil as necessary, and compact the soil to meet the liner density and permeability. Alternatively, the Contractor can use clean stockpiled soils or other on-site or off-site soils to construct the Sed Basin liner. 8. The Sed Basin will be constructed in a manner to utilize the existing discharge structure to gravity feed Sed Basin water to the LBVSD outfall as shown on the Drawings. 9. The contractor shall extend the inlet piping into the new Sed Basin as shown on the Drawings. 10. Gravel removed from the existing roads around the ash ponds will be used to construct a new road around the Sed Basin as shown on the Drawings. D.

Grading of the existing ash to the final contours will be performed using equipment suitable for the strength of the disposed ash. The ash shall be graded such that the final surface generally has a 1 per cent grade to the discharge points to be created by excavating a portion of the existing embankments. As indicated in the scope of work, the final surface of the

310513 - 9

Section 310513 Earthwork BVPS Ash Impoundment Closure

ash pond cover shall allow storm water falling on the cap to flow to the discharge points without ponding and without visible high points in the cap. E.

The Design Professional and the Owner will be notified at least forty eight (48) hours prior to Contractor placing any fill.

Compact each layer, when required, to the required thickness, density and moisture content prior to placing additional fill.

Compaction densities of the various materials and layers shall comply with the following requirements: 1. Barrier Clay Layer and Sed Basin Liner: As required to achieve specified hydraulic conductivity, in no instance less than 90 percent, ASTM D698. 2. Erosion layer: not less than 85 percent, ASTM D698. 3. Structural fills: not less than 90 percent, ASTM D698. 4. Compacted clean clay for the Sed Basin divider berm: not less than 95 percent, ASTM D698 5. Compacted backfill for northern half of divider berm: not less than 90 percent, ASTM D698

Compact by sheepsfoot-style soil compactors and pneumatic rollers or by other equipment as required to obtain specified density. 1. Compaction of the barrier soil layer and Sed Basin liner shall be accomplished with a sheepsfoot roller with fully penetrating feet. 2. Length of feet should be adequate to penetrate entire lift including scarified portion of lift below.

Ensure each layer of the barrier soil layer and Sed Basin liner is fully bonded to adjoining layers. This may be accomplished with compaction equipment and by disking between adjoining layers.

Work shall commence and progress in a manner to ensure rain events, which contact ash, are contained within the boundary of the existing ash ponds. A excavation and cap construction plan is to be submitted to the Design Professional and Owner’s Representative for approval, prior to commencement.

310513 - 10

Section 310513 Earthwork BVPS Ash Impoundment Closure

1. No ash contact water is to be discharged directly from the ash impoundments. All ash contact water is to be discharged through Outfall 002 or treated and tested in a manner approved by the Owner. 2. See J below regarding testing and handling of storm water discharge. K.

The work includes all operations in connection with excavation, borrow, construction of fills and embankments, rough and fine grading in connection with the preparation of the site for construction of the proposed facilities.

Provide dewatering systems where necessary to successfully complete excavation, compaction, and other construction requirements. 1. Provide pumping of accumulated storm water, as required, to allow for excavations to allow construction access, and as needed in other construction. 2. Prior to initial pumping of storm water, Contractor must conduct testing for total metals (RCRA-8). Results must be under LBVSD Pretreatment Discharge Limits. a. If testing indicates compliance, Contractor will be allowed to discharge storm water to the on-site settling basin or the LBVSD sewer. b. If testing indicates non-compliance, Contractor will be required to containerize and dispose of storm water off-site or to treat the storm water to comply with the LBVSD pretreatment requirements. c. The use of a silt bag on outlet end of pump will be required for all pumping and dewatering applications. M. Protection of finish grade: 3. During construction, shape and drain embankment and excavations. 4. Maintain ditches and drains to provide drainage at all times. 5. Provide temporary drainage where necessary to prevent water from entering excavations or damaging construction. 6. Protect graded areas against action of elements prior to completion and acceptance.

310513 - 11

Section 310513 Earthwork BVPS Ash Impoundment Closure

7. Reestablish grade where erosion or sedimentation occurs. 8. Contractor is encouraged to develop a sequencing plan that diverts storm water away from the ash pond to limit dewatering. N. The Contractor has the responsibility to maintain all soil layers intact in all respects including: 1. Thickness, moisture content, density, free of waste, free of rill erosion, and free of weather related damage. 2. Freeze-thaw cycles on the barrier soil layer or the Sed Basin liner should be minimized. If freeze thaw cycles are encountered, Contractor will be required to confirm, by retesting hydraulic conductivity, that the barrier soil layer meets the requirements of the specifications. If testing indicates permeability greater than specified, Contractor will be responsible to rework the barrier soil layer, at no additional cost to the Owner. 3.2

PLACEMENT AND COMPACTION OF BARRIER SOIL, LINER SOIL, AND STRUCTURAL FILL A.

The Design Professional and Owner will be notified at least forty eight (48) hours prior to Contractor placing any fill material.

The Contractor shall place and compact fill in accordance with industry standard construction practices and procedures.

Hauling and spreading equipment will not be considered compaction equipment.

Exposed areas to receive the cover, backfill, or embankment shall be proof-rolled to detect localized zones of excessively wet, unstable, organic, or low bearing capacity materials to the extent as follows: 1.

Proof roll as a single-pass operation with conventional compaction equipment during subgrade preparation and prior to placement of fill, and as a spot check process without the need for complete coverage per unit area of tire. Soft spots shall be over excavated, backfilled, and compacted with suitable material.

The Contractor shall perform a Test Fill of the barrier soil layer in accordance with the Specifications. The Test Fill results must be accepted by the Design Professional before beginning construction of the Barrier Soil layer.

310513 - 12

Section 310513 Earthwork BVPS Ash Impoundment Closure

Borrow soils used in the barrier soil layer or Sed Basin liner shall be processed to achieve required moisture content prior to compaction. Maintained in a range established by acceptable zone but in no instance outside the range of optimum moisture to less than or equal to 6 percent above optimum moisture as defined by ASTM D698

The Contractor shall be responsible for maintaining proper lift thickness. The maximum loose lift thickness shall not exceed eight (8) inches.

Soil utilized for structural components shall be compacted to the minimum percent of the maximum dry density as indicated in Part 3.1.C. of this Section as determined by field testing performed in accordance with ASTM D6938.

Barrier soil fill and Sed Basin liner soil taken at the borrow source during construction testing shall be tested at the rate of one test per every 5,000 cubic yards of material, or more frequently if visual observations indicate a change in material characteristics, or deemed so by the geotechnical technician. Soil from the borrow source shall be tested before transportation to the landfill site. 1.

Bulk sample testing shall include: a.

Moisture Content (ASTM D854)

Particle Size (ASTM D1140, D442)

Atterberg Limits (ASTM D4318)

Laboratory Compaction (ASTM D698)

Laboratory Hydraulic Conductivity at a specified compaction (ASTM D5084)

The barrier soil and Sed Basin liner soil shall be compacted to at least 90 percent of the maximum dry density at a moisture content at or exceeding the optimum moisture content and as necessary to achieve the hydraulic conductivity performance requirement. Compaction shall be field tested at a rate of one test per 10,000 square feet in accordance with ASTM D6938.

The compacted barrier soil layer and Sed Basin liner must achieve a hydraulic conductivity of 1 x 10-7 cm/sec or less as determined on an undisturbed soil sample by ASTM D5084. Tests shall be conducted at a rate of one test per 100,000 square feet.

310513 - 13

Section 310513 Earthwork BVPS Ash Impoundment Closure

3.3

If the compacted barrier soil layer or Sed Basin liner soil is not protected or instrumented while the ambient air temperature drops below 27 degrees F at the nearest national weather station observation point, the top lift of the compacted clay material shall be repaired by removing the vegetative layer, exposing the barrier soil layer, re-compacting the clay damaged by the freeze thaw cycle within the “acceptable zone”, and recertifying the construction of the barrier soil system or Sed Basin liner system in accordance with this plan.

Each accepted lift will be left rough or scarified at least two (2) inches before placing the next overlying lift.

If a failure in moisture or density requirements is detected, after placement of any part of the barrier soil layer or Sed Basin liner is detected, this material, in the area of the failure, shall be over excavated, the failure repaired and the full depth of the layer replaced in lifts and compacted as specified.

Desiccation of Sed Basin liner or barrier soil layer will be corrected by Contractor at no additional expense to the Owner.

No surveying grade stakes or other penetrations shall be made in the Sed Basin liner or barrier soil layer. If such penetrations occur, entire area is subject to removal and replacement at no additional cost to the Owner.

Final surfaces will be graded to the lines shown on the Construction Drawings plus the thickness of the final cover system. Completed fill shall correspond to shape of cross section or contour indicated.

Final surfaces will be smooth drum rolled free of loose material, clods, and other debris including grade stakes and hubs.

PLACEMENT AND COMPACTION OF VEGETATIVE TOPSOIL A.

The owner will be notified at least forty eight (48) hours prior to Contractor placing any soil material

The Contractor shall place vegetative topsoil fill in accordance with industry standard construction practices and procedures.

Topsoil shall be placed immediately following QA testing and surveying of the barrier soil layer.

The Contractor shall place the topsoil so as not to damage the underlying geosynthetics, if applicable, or the barrier soil layer. Low ground pressure

310513 - 14

Section 310513 Earthwork BVPS Ash Impoundment Closure

equipment shall be used to spread the overlying soil. Any damage to the geosynthetics will be repaired at the Contractor’s expense.

3.4

3.5

3.6

Topsoil layer soils shall not be compacted beyond tracking with equipment used for placement.

Avoid clods greater than 3 inches in any dimension.

EXCAVATION AND GRADING OF ASH A.

Excavate existing ash materials to the depth and grade in order to establish proposed grades.

Move excavated ash material and place in compacted lifts to achieve proposed grades. Maximum lift thickness shall be 8 inches.

Exposed ash materials may be consolidated or cemented and may require mechanical effort to break apart materials to make suitable fill for placement and compaction. Compact to requirements for structural fill per Section 3.3.

BARRIER SOIL LAYER TEST PAD A.

The construction of test pad(s) or test fill(s) is required to verify that the materials and methods of construction proposed for production will produce a barrier soil layer as shown on the Drawings with the required, in-situ hydraulic conductivity.

The minimum size of the test pad shall be 30 feet by 40 feet in plan area and the methods and equipment shall be identical to those utilized in actual construction. The test pad shall be conducted on undisturbed ash.

Test pad may be part of proposed construction and remain in place provided all compaction tests pass specified moisture and density requirements.

STOCKPILING A.

Stockpile materials on site as designated by Design Professional.

Stockpile in sufficient quantities to meet Project schedule and requirements.

Separate differing materials with dividers or stockpile apart to prevent mixing.

310513 - 15

Section 310513 Earthwork BVPS Ash Impoundment Closure

3.7

3.8

Stockpile topsoil 8 feet high maximum.

Prevent intermixing of soil types or contamination.

Direct surface water away from stockpile site to prevent erosion or deterioration of materials.

STOCKPILE CLEANUP A.

Leave unused materials in neat, compact stockpile.

When borrow area is indicated, leave area in clean and neat condition. Grade site surface to prevent free standing surface water.

ACCEPTANCE A.

Upon completion of excavation and filling to the specified contours, each of the components (the top of ash and subgrade, barrier soil layer, topsoil layer, and Sed Basin liner), the Contractor will survey each layer to confirm proper grades and layer thicknesses.

The thickness of the barrier soil layer and erosion layers will be confirmed by test holes through the layer to measure the layer thickness.

The minimum acceptable thickness of the barrier soil layer is 18 inches.

The minimum acceptable thickness of the topsoil layer is 11 inches and the minimum average of the topsoil layer thickness measurements must be 12 inches or greater.

Fill any holes in the barrier soil layer with bentonite. END OF SECTION

310513 - 16

SECTION 310519.13 GEOTEXTILES PART 1 GENERAL 1.1

1.2

SUMMARY A.

Section includes: Installing geotextile associated with the installation of riprap over an alternate final cover systems and under site roadways, as shown on the Construction Drawings or as directed by the Design Professional.

Related Sections: Section 310513 – Earthwork.

Section 310519.23 – Geosynthetic Clay Liner (GCL)

QUALITY ASSURANCE/QUALITY CONTROL A.

1.3

Quality Assurance (QA) and Quality Control (QC) shall be performed in conformance with this Section.

SUBMITTALS A.

Prior to procurement of the geotextile, the Contractor shall submit to the Design Professional the following information for approval: 1.

Origin and identification of the raw materials used to manufacture the geotextile (including polymer density and type, and ultraviolet radiation (UV) stability).

A copy of QC certificate regarding the raw materials issued by the producer of the raw materials.

A copy of QC certificate issued by the manufacturer of the geotextile that the geotextile is continuously inspected for uniformity, damage, imperfections, and foreign materials. A history of the nature and frequency of repair, the method of repair and remediation, and results of re-testing of the geotextile shall be reported. In addition, the manufacturer recommended method of transportation, loading, and unloading of the geotextile should be submitted.

Samples of the proposed material. The material samples shall, at a minimum, consist of a piece of material three feet in length, by the whole width of the roll.

310519.16 - 1

Section 310519.16 Geomembranes BVPS Ash Impoundment Closure

The Contractor shall submit the following to the Design Professional for evaluation and acceptance of each material and manufacturer prior to use: a.

Proposed product model and manufacturer.

Manufacturer published Minimum Average Roll Values (MARVs) for the material properties specified.

Manufacturer's QC testing protocol for the product including tests performed and frequency.

Results of manufacturer QC testing for the material produced for this project.

Manufacturer affidavit of compliance that the material conforms to the physical properties specified.

Manufacturer data including roll dimensions, storage requirements, handling requirements, and installation instructions.

Bill of Lading indicating the rolls were delivered to the Site.

The Contractor shall provide samples of material from actual material delivered to the site to the Design Professional for independent QA Testing as required by the Design Professional.

A sample of the proposed sewn seam to be tested by the QC Geosynthetic Laboratory in accordance with ASTM D4884 - Test Method for Strength of Sewn or Thermally Bonded Seams of Geotextiles. The sample shall include at least five feet of seam and three feet of width, such that five specimens of the seam for ASTM D4884 testing can be obtained from the sample.

Certified minimum values (i.e., values equal to the mean value minus two standard deviations obtained from routine testing on the product) by the QC Geosynthetic Laboratory for the properties listed in Parts 2.2, 2.3 and 2.4.

The frequency of testing shall be as specified in Part 3.3 of this Section. The manufacturer shall submit his proposed testing program to the Design Professional for approval.

310519.16 - 2

Section 310519.16 Geomembranes BVPS Ash Impoundment Closure

1.4

DELIVERY, STORAGE, AND HANDLING A.

Provide wrapping to protect geotextile during shipping and storage and should not be removed until just before installation.

Protect geotextile from exposure to UV and moisture.

Geotextile materials shall be stored such that they are not in direct contact with ground and ponded liquid. Any materials that become saturated by storm water runoff, ponding, or direct precipitation will be evaluated by the Design Professional for possible rejection. Rejected materials will be removed from the site and replaced at no additional cost to the Owner.

Deliver, store, and handle in accordance with the manufacturer’s recommendations.

Geotextile shall be lifted off the ground when moving.

Contractor shall use a front end loader fitted with a tapered pole for loading and unloading geotextile.

PART 2 PRODUCTS 2.1

MATERIALS A.

Contractor shall demonstrate that the properties (excluding seam strength) of the geotextile specified in the table below do not deviate more than the specified percentage from values of average test results obtained from the manufacturer testing program and NOT compared to the values listed in these tables. Acceptable evidence may consist of comparing average values of at least five tests before and after exposure or any other method proposed by the Contractor that is acceptable to the Design Professional. In any case, values shall not fall below the values listed in the table in this Section.

8-ounce per square yard non-woven geotextile shall have the following properties:

Properties Mass Per Unit Area Grab Strength @ 50% Elongation(2) Tear Strength(3) CBR Puncture Strength UV Resistance @ 500 hours

Value(1) 8.0 oz/sy 220 lb 90 lb 575 lb 70 percent, minimum

(1) Values are MARV except UV resistance, it is a minimum value

310519.16 - 3

Test Method(4) ASTM D 5261 ASTM D 4632 ASTM D 4533 ASTM D 4833 ASTM D 7238

Section 310519.16 Geomembranes BVPS Ash Impoundment Closure

PART 3 EXECUTION 3.1

INSTALLATION A.

The non-woven geotextile shall be installed under rebuilt roadways and at all locations where riprap is to be installed, as indicated on the Construction Drawings and/or by the Design Professional.

For placement of non-woven geotextile used as part of the final cover system, the geomembrane surface shall be cleared of sharp objects, or any materials that may contribute to geosynthetic punctures, shearing, rupturing or tearing.

During periods of high winds, sandbags or other methods approved by the manufacturer shall be used to secure any exposed fabric in place.

Prior to deployment, the geotextile shall be protected from UV exposure, precipitation, mud, dirt, puncture, cutting or any other damaging or deleterious conditions. The rolls shall be shipped and stored in opaque and watertight wrappings. The wrappings shall be removed just before the installation but no more than one hour prior to installation. After installation, the geotextile shall not be exposed to sunlight for more than 30 days. Geotextile exposed to sunlight for more than 30 days will be removed from the site and replaced at no additional cost to the Owner.

The geotextile shall be unrolled in overlapping strips as recommended by the manufacturer and directed by the Design Professional.

The geotextile shall not be placed on top of alternate barrier layer, if applicable, until the geotextile has been inspected and approved by the Design Professional.

Care shall be taken in installing geotextile to avoid excessive stretching and tearing of the material.

All non-woven geotextile seams for final cover systems shall be overlapped a minimum of 6 inches and sewn according to manufacturer’s recommendations and procedures, and as approved by the Design Professional. The woven geotextiles for roadways shall be overlapped a minimum of 1 foot. Seams on side-slopes shall be oriented perpendicular to the slope contours. End-of-roll seams shall be offset a minimum of 5 feet between adjacent rolls ends. Cross-slope seams shall be avoided as much as possible. All geotextile seams shall be sewn, not layered.

Any fabric damaged during its installation or during placement of cover materials shall be replaced by the Contractor at no additional cost to the Owner, as specified in Part 3.4 of this Section.

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Section 310519.16 Geomembranes BVPS Ash Impoundment Closure

3.2

Upon complete installation of geotextile fabrics, and prior placement of overlying materials, the CQA Manager shall inspect the installed geotextile fabrics for physical damage, satisfactory sewing of seams and/ or proper seam overlap in accordance with the installation instructions.

The Contractor shall mark any damaged area requiring repair.

The Contractor shall inspect all repairs prior to overlying material placement.

PRODUCT QUALIFICATION TESTING A.

3.3

Quality Control Testing: 1.

The Contractor shall perform the initial QC Testing specified herein for each manufacturer and model of geotextile material prior to approval of material for use.

The Contractor shall perform testing for each manufacturer and model of geotextile materials for the parameters listed in Parts 2.1 of this Section.

The Contractor shall submit a three-foot long by the total roll width sample to Design Professional for QA testing.

QUALITY CONTROL DURING CONSTRUCTION A.

Quality Control Testing: 1.

The Contractor shall perform the QC Testing specified herein at the frequency specified for each manufacturer and model of the geotextile material.

The Contractor shall collect representative samples from geotextile materials delivered to the Site and test them at a rate of one sample per 100,000 square feet or one sample per lot, whichever is more frequent for the parameters listed in Part 2.1 of this Section.

Each sample shall be a minimum of 2 feet long by the roll width and representative of geotextile installed. The Contractor shall mark the sample with the roll number and lot number from which the sample was taken

The QC Geosynthetics Laboratory shall forward copies of all material test results to both the Design Professional and the Contractor.

310519.16 - 5

Section 310519.16 Geomembranes BVPS Ash Impoundment Closure

3.4

PROTECTION A.

Any geotextile damaged during its installation or during placement shall be repaired or replaced at the discretion of the Design Professional and at no additional cost to the Owner.

If non-woven geotextile for service roadways should be damaged during any step of the installation, a piece of geotextile material shall be cut and placed over the damaged area with a 2 feet minimum overlap.

The Contractor shall protect the work described in this Section before, during, and after installation, and shall protect the installed work covered by other Sections.

Any damage mark, hole or tear in non-woven geotextile fabric for the final cover system construction shall be repaired as follows: 1.

A fabric patch shall be sewn into place using a double sewn lock stitch (¼-inch to ¾-inch apart and no closer than 1-inch form any edge) or as directed by the Design Professional.

On slopes with a grade less than 10 percent, the Contractor may use a fabric patch spot lystered in place with a minimum of 12 inches overlap in all directions.

Should any damaged area exceed 10 percent of the width of the roll, the roll shall be cut and overlapped to form a new seam.

Any defects in a fused seam will be covered a minimum of one foot on all sides with a new piece of geotextile and temporarily bonded in-place, as approved by the Design Professional. END OF SECTION

310519.16 - 6

SECTION 310519.23 GEOSYNTHETIC CLAY LINER (GCL) PART 1 GENERAL 1.1

1.2

Summary A.

If the Contractor elects to install an alternate cover incorporating a geosynthetic clay liner (GCL), the Contractor shall furnish all labor, materials, testing, surveying and incidentals required to supply, install and test the GCL material, including installation of GCL final cover system, as shown on the Construction Drawings and specified herein or as directed by the Design Professional.

A GCL liners incorporate a geosynthetic with a sodium bentonite clay to form an impermeable barrier to replace the 18 inches of clay soil in the EPA CCR cap. The term GCL includes both a geomembrane supported GCL and a fabric encased GCL.

Related Sections: 1.

Section 310513, Earthwork

Section 310519.13, Geotextiles

REFERENCES A.

ASTM D 4632 (latest version), Grab Breaking Load and Elongation of Geotextiles.

ASTM D 5084 (latest version), Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter.

ASTM D 5887 (latest version), Measurement of Index Flux Through Saturated Geosynthetic Clay Liner Specimens Using a Flexible Wall Permeameter.

ASTM D 5888 (latest version), Storage and Handling of Geosynthetic Clay Liners.

ASTM D 5889 (latest version), Quality Control of Geosynthetic Clay Liners.

ASTM D 5890 (latest version), Swell Index of Clay Mineral Component of Geosynthetic Clay Liners.

ASTM D 5891 (latest version), Fluid Loss of Clay Component of Geosynthetic Clay Liners. 310519.23 - 1

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

H. 1.3

ASTM D 5993 (latest version), Measuring Mass per Unit of Geosynthetic Clay Liners.

SUBMITTALS A.

The Contractor shall submit the following items to the Design Professional for approval prior to procuring the GCL: 1.

Manufacturer certified raw and roll material data sheets indicating that the material conforms to the requirements of this Section.

Manufacturer qualifications and QC manual which describes testing procedures, frequency of testing and acceptance/rejection criteria for QC testing. At a minimum, the manufacturer shall provide QC testing of the type and frequency as required.

Drawings showing layout of GCL sheets, anchor trench details and pipe penetration details. Layout diagram indicating the location of pre-assembled panels. Shop drawings need not identify each sheet and panel by number.

Complete description of field seaming procedures.

Work plan for GCL installation including manpower and equipment requirements.

Samples of GCL proposed for use.

Detailed description of field testing methods to be performed.

Interface friction angle test results, if required.

Reference list supplied by GCL manufacturer indicating the appropriate experience level as required.

10.

Reference list supplied by the GCL installer indicating the appropriate experience level as required.

11.

Manufacturer warranty.

12.

Provide 6 copies of an affidavit, certifying that all GCL materials furnished for this project comply with all requirements specified in the Contract Documents. No GCL shall be shipped until the affidavits are submitted.

Prior to the installation of any GCL material, the Contractor shall submit for approval to the Design Professional information obtained from the

310519.23 - 2

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

manufacturer and/or QC geosynthetic testing laboratory, as indicated in the specifications. 1.4

1.5

DELIVERY, STORAGE, AND HANDLING A.

Delivery: Delivery, storage, and handling of GCL shall be in accordance with ASTM D 5888. The QC Geosynthetic Inspector shall be present during delivery and unloading of the GCL. Rolls shall be packaged in an opaque, waterproof, protective covering and wrapped around a central core. Tears in the packaging shall be repaired to restore a waterproof protective barrier around the GCL. Unloading of rolls from the delivery vehicles shall be done preventing damage to the GCL and its packaging.

Storage: Field storage shall be in flat, dry areas where water cannot accumulate and the GCL rolls can be protected from damage. Storage of the rolls on blocks or pallets will not be allowed unless the GCL rolls are fully supported as approved by the Design Professional. Stacks of GCL rolls shall be no greater than three high. Rolls shall be covered with a waterproof tarpaulin or plastic sheet if stored outdoors. Rolls shall be stored in a manner that prevents sliding or rolling.

Handling: Rolls shall not be dragged, lifted by one end, or dropped to the ground from the delivery vehicle. A pipe or solid bar of sufficient strength to support the full weight of the roll without significant bending shall be used for all unloading and handling activities. The diameter of the pipe shall be small enough to be easily inserted through the core of the GCL roll. Chains shall be used to link the ends of the core pipe or bar to the ends of a spreader bar. The spreader bar shall be wide enough to prevent the chains from rubbing against the ends of the GCL roll. Alternatively, a stinger bar protruding from the end of a forklift or other equipment may be used. The stinger bar shall be at least three-fourths the length of the core and also must be capable of supporting the full weight of the GCL without significant bending. If recommended by the manufacturer, a sling handling method utilizing appropriate loading straps may be used.

Bagged bentonite, to be used for seaming, penetration or repairs, shall be stored and handled in accordance with the manufacturer recommendations. Bentonite shall be stored in a manner that provides complete protection from the weather so that the bentonite does not come into contact with moisture at any time prior to installation.

QUALITY ASSURANCE/QUALITY CONTROL A.

Quality Assurance (QA) and Quality Control (QC) shall be performed in conformance with these Specifications and the Construction Drawings.

310519.23 - 3

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

1.6

1.7

QUALIFICATIONS A.

Manufacturer: GCL shall be the product of a GCL Manufacturer who has produced the proposed GCL using the same bentonite, polyethylene geomembrane and/or geotextile and adhesive for at least 5 completed projects and shall have produced a minimum of 1,000,000 square feet of the proposed GCL.

Installer: The installer shall have installed GCL at a minimum of 5 projects of comparable scope and complexity and shall have installed a minimum of 1,000,000 square feet of the proposed GCL

WARRANTY A.

The manufacturer's warranty shall state that GCL material meets all requirements of the Contract Documents and that for the intended use the GCL is warranted for 20 years against deterioration.

The Geosynthetics Installer's warranty shall state that the GCL shall not fail due to improper installation within 5 years.

PART 2 PRODUCTS 2.1

General A.

Single Source: All GCL material shall be obtained from a single material supplier and all GCL rolls shall be manufactured by a single GCL manufacturer. Any accessory bentonite used for sealing seams, penetrations or repairs shall be the same granular bentonite used in the production of the GCL itself.

2.2

GCL materials: A.

The fabric encased GCL shall be a reinforced (needle-punched) system of sodium bentonite between one non-woven geotextile (top layer) and one woven geotextile (bottom layer), that meets the following minimum average roll values (MARV) criteria as a composite system:

310519.23 - 4

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

MATERIAL TEST TEST PROPERTY METHOD FREQUENCY GEOTEXTILE PROPERTIES (TOP AND BOTTOM) Nonwoven, Mass/Unit 1/25,000 yd² ASTM D 5261 Area (1/20,000m²) Woven, Mass/Unit 1/25,000 yd² ASTM D 5261 Area (1/20,000m²) BENTONITE PROPERTIES Swell Index ASTM D5890 1/load or 1/50 tons Fluid Loss ASTM D5891 1/load or 1/50 tons Mass/Area ASTM D5993 1/40,000 SF FINISHED GCL PROPERTIES Mass/Area ASTM D 5993 1/5,000 yd² Tensile Strength ASTM D6768 25,000 yd2 Peel Strength ASTM D6496 1/5,000 yd² Moisture Content ASTM D5993 1/5,000 yd3

REQUIRED VALUES 6.0 oz/yd² MARV 3.1 oz/yd² MARV 24 mL / 2g min. 18 mL max. 0.75 lbs/sf.

Index Flux

ASTM D5887

30,000 yd2

Permeability (cm/sec) Internal Shear Strength

ASTM D5887

30,000 yd2

0.81 lb/ft² 23 lbs/in 2.1 lb/in 35% max. 1 x 10-6 cm/sec max 5 x 10-9 max

ASTM D 6243

Periodically

500 psf Typical

The GCL shall be reinforced with high strength fabric thread similar to the carrier geotextile to provide internal shear strength reinforcing. The internal shear reinforcing mechanism shall resist failure due to thread pullout over long-term creep situations.

The geotextiles shall allow sufficient bentonite flow-through such that the permeability of the overlap seams is equal to or less than the permeability of the body of the GCL sheet without the addition of granular or paste bentonite.

The bentonite shall be continuously adhered to both geotextiles to ensure that the bentonite will not be displaced during handling, transportation, storage and installation, including cutting, patching, and fitting around penetrations. A.

The geomembrane supported GCL shall be a textured LLDPE geomembrane adhered with a sodium bentonite layer that meets the following minimum requirements:

310519.23 - 5

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

MATERIAL TEST PROPERTY METHOD FINISHED GCL PROPERTIES

TEST FREQUENCY

Bentonite Coating(1), lb/ft2 Effective Hydraulic Conductivity, cm/sec GCL Tensile Strength(3), lb/in

1/40,000 ft2 periodically

ASTM D 5993 ASTM D 5887/E96 ASTM D 6768

REQUIRED VALUES >0.75 <4X10-12

1/200,000 ft2

GEOMEMBRANE PROPERTIES ASTM D 5199

1/100,000 ft2

30 27

ASTM D 1505

1/200,000 ft2

0.94

ASTM D 6693

1/200,000 ft2

ASTM D 6693

1/200,000 ft2

100

ASTM D 4833

1/200,000 ft

SODIUM BENTONITE PROPERTIES Hydraulic Conductivity, ASTM D 5887 cm/sec Swell Index, ml/2 g ASTM D 5890

periodically

<1X10-8

1/60,000 lb

>24

Thickness, mil Lowest individual reading Density, g/cm3 Tensile Properties Tensile Break Strength, lb/in Elongation at Break, % Puncture Resistance, lb

Hydraulic Conductivity, cm/sec

2.3

periodically

>18

PACKING AND LABELING

2.4

ASTM D 5887

GCLs shall be supplied in rolls wrapped in relatively impermeable and opaque protective covers and marked or tagged with the following information: 1. Manufacturer’s name 2. product identification 3. lot or batch number 4. roll number 5. roll dimensions

TRANSPORTATION A.

Transportation of the GCL, to the site, shall be the responsibility of the MANUFACTURER. The MANUFACTURER shall be liable for all damages to the materials incurred prior to and during transportation to the site.

310519.23 - 6

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

2.5

MANUFACTURING QUALITY CONTROL A.

The GCL shall be subject to quality control and conformance testing to assure that the materials provided meet the minimum performance requirements. In most cases, sampling can be carried out on a sacrificial portions of the material. Consequently, repair of sampled locations should not be required. 1. Quality Control Tests a. Manufacturer shall verify that the geomembrane backing of the GCL meets the corresponding manufacturer’s specification for that product. b. Manufacturer shall verify the proper mass per unit area of bentonite has been added to the product. c. All materials shall be tested in accordance with Manufacturer’s quality control program. The Manufacturer shall perform testing. Samples not satisfying the Manufacturer’s specifications shall result in the rejection of the applicable rolls. At the Manufacturer’s discretion and expense, additional testing of individual rolls may be performed to more closely identify the non-complying rolls and/or to qualify individual rolls. d. The Manufacturer shall certify the quality of the rolls. The quality control certificate shall include: 1) roll number and identification 2) sampling procedures 3) results of all quality control tests, including a description of test methods used

PART 3 EXECUTION 3.1

INSTALLATION A.

GCL shall be installed as soon as practical after delivery to Site.

GCL shall not be deployed if it is frozen or at temperatures below 32°F.

Rolls shall be delivered to the work area in their original packaging. Immediately prior to deployment, the packaging shall be carefully removed without damaging the GCL.

GCL which has been hydrated prior to being covered by an overlying geomembrane or a minimum of 12 inches of cover soil shall be removed and replaced. Hydrated GCL is defined as material which has become soft as determined by squeezing the material with finger pressure or material which has exhibited swelling, and as determined by the Design Professional. 310519.23 - 7

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

Method of Placement: 1.

Use no equipment that could damage the GCL by handling, trafficking, leakage of fluid, or other means;

Prohibit all personnel on the GCL from smoking, wearing damaging shoes, or engaging in other activities which could damage the GCL;

Use methods to unroll the panels that do not cause tears, folds or crimps in the GCL and do not damage the underlying layers;

Use methods to place the panels that minimize wrinkles (especially differential wrinkles between adjacent panels);

Place adequate loading (e.g. sand bags) not likely to damage the GCL, to prevent uplift by wind; and

Equipment and materials which can damage the GCL shall not be allowed to travel directly on the GCL.

The Geosynthetic Installer shall use an appropriate material as a slip sheet to protect the GCL as approved by the Design Professional.

Deployed GCL panels shall lie flat on the subgrade surface, with no wrinkles or folds.

Only as much GCL as can be covered at the end of the covering day shall be deployed. The GCL shall not be left uncovered overnight and the edges of the GCL shall be protected from moisture.

Weather Conditions:

GCL placement shall not be done during any precipitation, in the presence of excessive moisture (e.g. fog, dew or frost) in an area of ponded water or in the presence of excessive winds.

The Contractor shall verify that the above conditions are fulfilled. Additionally the Contractor shall verify that the supporting subgrade has not been damaged by weather conditions.

Damaged panels or portions of panels which have been rejected shall be marked and removed from the work area. The damaged materials shall become the property of the Contractor. The Contractor shall remove damaged GCL from Site at its own expense.

310519.23 - 8

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

3.2

3.3

SEAMS PREPARATION A.

Prior to seaming, confirm that the seam area is clean and free of moisture, dust, dirt, debris of any kind, and foreign material; clean area as necessary to permit seaming.

Overlap panels as specified by the manufacturer or by a minimum of six (6) inches, if not specified. End of roll overlapped seams shall have a minimum overlap of 24 inches, if not specified by manufacturer.

Seams shall be aligned with the fewest possible number of wrinkles.

SEAMING EQUIPMENT AND PRODUCTS A.

General: Use only processes for field seaming which have been recommended by the manufacturer and approved by the Design Professional.

Weather Conditions for Seaming:

Field seaming in prohibited during precipitation, in presence of moisture, or in the presence of high winds as determined by the Design Professional.

In all cases, the GCL shall be kept dry and protected from wind and moisture damage.

General Seaming Procedure: 1.

Extend seaming to the outside edge of panels to be placed in the anchor trench.

Wrinkles at the seam overlaps shall be cut along the ridge of the wrinkle in order to achieve a flat overlap. The cut wrinkles shall be seamed and patched with an oval or round patch of the same GCL extending a minimum of 24 inches beyond the wrinkle in all directions.

Seams at the ends of the panels should be constructed such that they are shingled in the direction of the grade to prevent the potential for runoff flow to enter the overlap zone.

Bentonite-enhanced seams shall be constructed by overlapping the adjacent panels, exposing the underlying edge, and then applying a continuous bead or fillet of granular sodium bentonite along a zone defined be the edge of the underlying panel and the 6-inch overlap. The minimum application rate at which the bentonite is to be

310519.23 - 9

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

applied is ¼ pound per linear foot (i.e., 0.4 kg/m) or as recommended by the GCL manufacturer.

3.4

Cutting the GCL should be performed using a sharp utility knife. Frequent blade changes are recommended to avoid irregular tearing of the geotextile components of the GCL during the cutting process.

The GCL shall be sealed around penetrations and structures embedded in the subgrade in accordance with the Construction Drawings. Granular bentonite or bentonite mastic shall be used liberally (approximately 2 lb/linear foot or 3 kg/m) to seal the GCL to these structures.

A secondary collar of GCL should be placed around the penetrations. It is helpful to first trace an outline of the penetration on the GCL and then to cut a “star” pattern in the collar to enhance the collar’s fit around the penetration.

DEFECTS AND REPAIRS A.

Sweep the GCL surface prior to inspection. Inspect all seams and nonseam areas of the GCL for defects, holes and any sign of contamination by foreign matter. Mark and repair each location which requires corrective actions.

Repair procedures should be agreed upon between the Design Professional and the Contractor CQA Manager. Unless otherwise agreed, the procedures shall be as follows: 1.

Defective seams shall be repaired by reconstruction as described below.

Tears shall be repaired by patching.

Larger holes and contamination by foreign matter shall be repaired by patches.

Patches shall be round or oval in shape, and made of the same GCL and extended a minimum of 24 inches beyond the edge of defects in each direction.

Patches shall be applied using approved methods only.

Any cold rudded areas shall be patched.

310519.23 - 10

Section 310519.23 Geosynthetic Clay Liner (GCL) BVPS Ash Impoundment Closure

If the GCL is subjected to premature hydration, the GCL installer shall notify the Design Professional. The Design Professional shall make a determination as to whether or not the material is acceptable. If the material is not acceptable, the unacceptable areas shall be cut, removed and repaired according to the requirements of this Section. END OF SECTION

310519.23 - 11

SECTION 311000 SITE CLEARING PART 1 GENERAL 1.1

SUMMARY A.

Section includes removal and stockpiling of existing gravel roads, demolition of existing structures, and stripping of vegetation within the ash impoundments, and stripping and stockpiling topsoil in work areas outside of the impoundments.

Related Sections: 1.

1.2

Section 312213 - Earthwork.

QUALITY ASSURANCE A.

Perform Work in accordance with applicable federal, state, and municipal standards.

Conform to applicable state regulations for environmental requirements, disposal of debris, and burning debris on site.

PART 2 PRODUCTS Not Used. PART 3 EXECUTION 3.1

3.2

EXAMINATION A.

Verify existing plant life and structures designated to remain are tagged or identified.

Identify storage area for placing removed materials.

PREPARATION A.

Call Local Utility Line Information service not less than three working days before performing Work. 1.

Request underground utilities to be located and marked within and surrounding construction areas.

311000 - 1

Section 31100 Site Clearing BVPS Ash Impoundment Closure

3.3

3.4

3.5

Ensure that storm water line from plant to bottom ash pond is located.

Ensure that storm water line from bottom ash outlet structure to the LBVSD sanitary sewer is located.

Request electrical service to the construction area be shutdown.

Overhead transmission lines to remain in service at all times.

Access to poles for the transmission line crossing the area to be maintained throughout the project.

Contractor will pay utility company or others as required for any repairs to damaged utilities. Contractor will replace or repair other existing features damaged by construction.

PROTECTION A.

Locate, identify, and protect utilities indicated to remain, from damage.

Protect bench marks, survey control points, and existing structures, roadways, and culverts from damage or displacement.

Identify Owner of pipes, electrical conduits, and other utilities encountered during construction to determine if systems have been abandoned and/or if the system can be removed.

CLEARING A.

Remove trees and shrubs within marked areas indicated. Remove stumps, main root ball, root system to depth of 12 inches below grade.

Do not clear outside the designated limits of cover construction.

Clear undergrowth and deadwood, without disturbing subsoil.

Separate soil from objectionable material.

Demolish the concrete pump structure in the north end of the bottom ash pond and place concrete in deep fill within bottom ash pond.

WASTE MANAGEMENT A.

Do not burn combustible material on site.

Dispose of vegetation offsite or in area approved by the owner.

311000 - 2

Section 31100 Site Clearing BVPS Ash Impoundment Closure

C. 3.6

3.7

Stockpile rock as directed by the Owner.

TOPSOIL EXCAVATION A.

Excavate topsoil, if any, from areas to be further excavated or regraded without mixing with foreign materials for use in finish grading.

Do not excavate wet topsoil.

Stockpile in area designated on site to depth not exceeding 8 feet and protect from erosion.

Do not remove topsoil from site.

ROAD GRAVEL EXCAVATION A.

Remove and stockpile road gravel from existing roadways around the ash impoundments as indicated on the construction drawings.

Stockpile road gravel as directed by Design Professional for later use. END OF SECTION

311000 - 3

SECTION 312319 DEWATERING PART 1 GENERAL 1.1

SUMMARY A.

1.2

Design, furnish, install, test, operate, monitor, and maintain dewatering system of sufficient scope, size, and capacity to lower, control, remove, and dispose of existing water ponded at surface and permit excavation and construction to proceed on dry, stable subgrades adequate to support construction equipment. 1.

A wellpoint dewatering system or systems which will lower and maintain the water level in the ash at least 2 feet below required excavation elevations but in no case should extend below the bottom of ash.

CCR in the ponds are expected to be sensitive to seepage forces and pore pressures.

Dewatering design to be by a qualified Professional Engineer.

Prevent surface water from entering dewatering areas by berms or means selected by the Contractor.

Related Sections: 1.

Section 015713 – Temporary Erosion and Sediment Controls

Section 015719 – Temporary Environmental Controls

Section 31100 – Site Clearing

Section 310513 – Earthwork

PERFORMANCE REQUIREMENTS A.

Continuously maintain the water level in the ash at or slightly below the required elevations until all Work in the areas requiring dewatering until the cap placement reaches the location of the well points. Provide standby equipment as necessary to maintain the dewatering system. If the dewatering requirements are not met due to an inadequate system or system failure, expand the system as necessary to meet the dewatering requirements and repair the damage to any work, structure, or foundation.

329113 - 1

Section 312319 Dewatering BVPS Ash Impoundment Closure

B. 1.3

1.4

QUALITY CONTROL A.

Qualifications: The Work of this Section shall be performed by a firm experienced in wellpoint dewatering Work. The firm shall have satisfactorily completed such Work for at least 5 projects of comparable size.

The dewatering system shall consist of equipment, appliances, and materials designed or suitable for controlling the water level in the ash.

SUBMITTALS A.

1.5

The Contractor is responsible for testing to confirm the stability of the existing ash pond material prior to placement of any fill.

Shop Drawings: Submit drawings and diagrams, with all pertinent data, showing the dewatering system proposed for use. Indicate the spacing and location of wellpoints and reading wells, and location of header lines, pumps, valves and discharge lines.

PROJECT CONDITIONS A.

Existing Conditions: Site soil boring data and samples and any soil reports will be made available to prospective bidders for study and review. Bidders must make their own interpretation of subsurface conditions that may affect methods or the cost of construction of the Work.

312319 - 2

Section 312319 Dewatering BVPS Ash Impoundment Closure

PART 2 PRODUCTS 2.1

DEWATERING SYSTEM A.

Furnish a self-jetting type wellpoint dewatering system of adequate size and capacity to lower and maintain the water level in the ash at the specified level. The system shall include standby pumps and power source for continuous operation. 1.

Dewatering system shall consist of wellpoints, riser pipes, swing joints, header lines, valves, pumps, discharge lines, and all other necessary fittings, accessories and equipment for a complete operating wellpoint system. Furnish hole punches, sand backfill, and clay plugs as required by soil conditions.

Observation Wellpoints: Furnish sufficient wells or piezometers to monitor the water level in the ash. Furnish approved measuring equipment complete with all required piping and accessories as required for accurate measurements.

Sand: Clean concrete sand conforming to ASTM C 33.

PART 3 EXECUTION 3.1

PREPARATION A.

Install the observation wellpoints at locations indicated on approved shop drawings or where directed. Install observation wellpoints in accordance with manufacturer’s printed instructions and in accordance with approved shop drawings. Place sand backfill around wellpoint. Test each observation wellpoint to verify that the installation is performing properly. 1.

3.2

Protect observation well standpipes from damage by construction operations and maintain accessibility to them. Maintain piezometers or reading wells until the water in the ash is allowed to return to its normal level, then extend the well casing through the final cap.

INSTALLATION A.

Install the dewatering system in accordance with approved shop drawings and as required by Site conditions. Locate elements of the system to allow a continuous dewatering operation without interfering with the installation of any permanent project Work.

312319 - 3

Section 312319 Dewatering BVPS Ash Impoundment Closure

3.3

OPERATION A.

3.4

3.5

May need to keep the wellpoint system in continuous operation from the time excavation is started in the dewatering area (or before if required by Site conditions to lower the water level in the ash) until the time cap installation progress reaches the well.

FIELD QUALITY CONTROLS A.

Maintain a careful check to detect any settlement in existing adjacent Work. Notify the Owner’s Representative of any signs of settlement. Establish settlement point bench marks and take periodic readings when directed.

Take and record measurements of the water level in the ash from each reading well periodically as necessary to document the ash water level in the dewatering area.

DISCHARGE A.

3.6

The Owner’s Representative will designate wells that are to remain following the cap construction for monitoring long term hydrostatic pressures under the cap.

Discharge water into existing site storm water basin or temporary sedimentation units, as applicable.

REMOVAL A.

When the dewatering system is no longer required and when directed, modify the system to act as an underdrain for the impoundment cap. Cut off wellpoints as indicated in the drawings, connect to a gravity header, and extend the gravity header pipe through a trench cut in the existing berm slope outside of the limits of the cap. Terminate the gravity pipe as shown on the Drawings

Piezometers selected by the Owner to remain after construction, if any, will become the property of the Owner. END OF SECTION

312319 - 4

SECTION 313700 RIPRAP PART 1 GENERAL 1.1

1.2

1.3

SUMMARY A.

Section includes: riprap placed for erosion protection in the surface runoff areas from the impoundment cap as shown on the drawings.

Grade the locations where the riprap is to be placed as shown in the Drawings. Prepare for the riprap by undercutting to the depth required for the riprap applicable to the type of cap selected. After the cap barrier layer is completed, place the geotextile fabric (if using final cover system consisting of geosynthetics, exempt for soil cover option), bedding layer, and the riprap to the design grades.

Related Sections: 1.

Section 310513 – Earthwork

Section –310519.13 – Geotextiles

SUBMITTALS A.

Section 013300 - Submittal Procedures: Requirements for submittals.

Product Data: Submit data for riprap and geotextile fabric.

QUALITY ASSURANCE A.

Furnish each aggregate material from single source throughout the Work.

Perform Work in accordance with applicable federal, state, and municipal standards.

The Contractor shall provide the following to the Owner’s Representative for evaluation and acceptance of each material source prior to subsequent quality control (QC) testing and use of the material source: 1.

Proposed material source location and vendor.

Valid permit for material source, if applicable.

313700 - 1

Section 313700 Riprap BVPS Ash Impoundment Closure

50 pound sample of material for quality assurance (QA).

Access to the material source for inspection.

A gradation analysis.

Calcium carbonate test certification.

PART 2 PRODUCTS 2.1

MATERIALS A.

General 1.

Individual rock fragments shall be dense, sound, and free from cracks, seams, and other defects conducive to accelerated weathering. The rock fragments shall be rounded to subrounded in shape. The least dimension of an individual rock fragment shall be not less than one-third the greatest dimension of the fragment.

Except as provided below, the rock shall have the following properties:

Bulk specific gravity (saturated surface-dry basis) not less than 2.3.

Absorption not more than four percent.

Soundness: Weight loss in 5 cycles not more than 20 percent when sodium sulfate is used or 25 percent when magnesium sulfate is used.

The bulk specific gravity and absorption shall be determined by ASTM Method C 127. The test for soundness shall be performed by ASTM C88 for coarse aggregate modified as follows: a.

The test sample shall not be separated into fractions. It shall consist of 500 to 300 grams of rock fragments, reasonably uniform in size and shape and weighing approximately 100 grams each, obtained by breaking the rock and selecting fragments of the required size.

After the sample has been dried, following completion of the final test cycle and washing to remove the sodium sulfate or magnesium sulfate, the loss of weight shall be determined by subtracting from the original weight of the sample the final

313700 - 2

Section 313700 Riprap BVPS Ash Impoundment Closure

weight of all fragments which have not broken into three or more pieces. c. 4.

The report shall show the percentage loss of weight and the results of the qualitative examination.

Rock that fails to meet the requirements stated above, may be accepted only if similar rock from the same source has been demonstrated to be sound after five years or more of service under conditions of weather, wetting and drying, and erosive forces similar to those anticipated for the rock to be installed under this specification. Stone for Riprap.

The riprap materials shall be well graded by weight within the limits stated below : Gradation, Percentage of Stones of Various Weights (pounds) Size

% Finer by Weight

300 75 5

100 50 10

The solid rock shall have a density of at least 40 lb/ft3.

The rock shall be limestone. It shall be clean and free from earth, clay, or refuse.

Each piece shall have no dimension greater than three (3) times its least dimension.

Stone for Bedding Layer. 1.

The riprap materials shall be well graded by weight within the limits stated below : Percent Retained on Sieve Size Sieve Percent 4” 0-25 2” 40-60 ½” 75-95

313700 - 3

Section 313700 Riprap BVPS Ash Impoundment Closure

PART 3 EXECUTION 3.1

3.2

3.3

SUBGRADE PREPARATION A.

The subgrade surfaces on which the riprap or bedding course is to be placed shall be cut or filled and graded to the lines as required, it shall consist of approved materials and shall conform to the requirements of the specified class of fill.

Riprap shall not be placed until the foundation preparation is completed and the subgrade surfaces have been inspected, surveyed, and approved by the Owner’s Representative.

EQUIPMENT PLACED RIPRAP A.

The rock shall be placed by equipment on the surfaces and to the depths specified. The riprap shall be constructed to the full course thickness in one operation and in such a manner as to avoid serious displacement of the underlying materials. The rock shall be delivered and placed in a manner that will insure that the riprap in place shall be reasonably homogeneous with the larger rock uniformly distributed and firmly in contact to one another with the smaller rocks and spalls filling the voids between the larger rocks.

Riprap shall be placed in a manner to prevent damage to structures. Hand placing will be required to the extent necessary to prevent damage to the permanent works.

HAND-PLACED RIPRAP A.

3.4

The rock shall be placed by hand on the surfaces and to the depths specified. It shall be securely bedded with the larger rocks firmly in contact one to another. Spaces between the larger rocks shall be filled with smaller rocks and spalls. Smaller rocks shall not be grouped as a substitute for larger rocks. Flat slab rock shall be laid on edge.

FILTER LAYER AND BEDDING A.

Filter fabric (geotextile) shall be placed on properly graded and compacted subgrade when a final cover options includes a geosynthetic (exempt for soil only cover system). The fabric shall be laid such that the lateral seams run up and down the slope. All seams shall be lapped according to the manufacturer’s recommendation.

When the drawings specify filter layers or bedding beneath riprap, the filter or bedding material shall be spread uniformly on the prepared

313700 - 4

Section 313700 Riprap BVPS Ash Impoundment Closure

subgrade surfaces to the depth specified. Compaction of filter layers or bedding will not be required, but the surface of such layers shall be finished reasonably free of mounds, dips, or windows. 3.5

TESTING A.

The Design Professional may perform such tests as are required to verify that the riprap, filter, and bedding materials and the completed work meet the requirements of the specifications. These tests are not intended to provide the Contractor with the information he needs to assure that the materials and workmanship meet the requirements of the specifications, and their performance will not relieve the Contractor of the responsibility of performing his own tests for that purpose. END OF SECTION

313700 - 5

SECTION 329219 SEEDING PART 1 GENERAL 1.1

SUMMARY A.

Section includes permanent seeing to provide long-term, low maintenance vegetative cover. Dormant seeding can be performed between December 1st and March 15th. Cool season mixtures can be planted between August 1st and October 15th. This section includes: 1.

Fertilizing.

Seeding.

Hydroseeding.

Mulching.

Maintenance.

Related Sections: 1.

1.2

REFERENCES A.

ASTM International: 1.

Missouri Agronomy Specification, Vegetation Establishment, Herbaceous Seeding, Code 723 (Transmittal Number 499, July 2012)

DEFINITIONS A.

1.4

ASTM C602 - Standard Specification for Agricultural Liming Materials.

Natural Resources Conservation Services: 1.

1.3

Section 310513 - Earthwork

Weeds: Vegetative species other than specified species to be established in given area.

SUBMITTALS A.

Section 013300 - Submittal Procedures Requirements for submittals.

329219- 1

Section 329219 Seeding BVPS Ash Impoundment Closure

1.5

1.6

1.7

Product Data: Submit data for seed mix, fertilizer, mulch, and other accessories.

Certification: Certify each container of seed delivered will be labeled in accordance with Federal and State Seed Laws and equals or exceeds Specification requirements.

Manufacturer's Certificate: Certify products meet or exceed specified requirements.

CLOSEOUT SUBMITTALS A.

Sections 017300 - Execution and 017700 - Closeout Procedures: Requirements for submittals.

Copies of invoices for fertilizer used on Project showing grade furnished, along with certification of quality and warranty.

Operation and Maintenance Data: Include maintenance instructions, cutting method and maximum grass height.

QUALITY ASSURANCE A.

Provide seed mixture in containers showing percentage of seed mix, germination percentage, inert matter percentage, weed percentage, year of production, net weight, date of packaging, and location of packaging.

Seed mixture shall have a current seed test within 10 months of the planting date that lists germination, purity, and hard seed as a percentage for determining pure live seed and lists the percent of weed seed present that meets State seed quality law standards.

Perform Work in accordance with applicable federal, state, and municipal standards.

QUALIFICATIONS A.

Seed Supplier: Company specializing in manufacturing Products specified in this section with minimum three years documented experience.

Installer: Company specializing in performing work of this section with minimum three years documented experience approved by manufacturer.

329219- 2

Section 329219 Seeding BVPS Ash Impoundment Closure

1.8

1.9

DELIVERY, STORAGE, AND HANDLING A.

Deliver grass seed mixture in sealed containers labeled with producer's name and seed analysis. Seed in damaged packaging is not acceptable. Remove from the site seed which has become wet, moldy or otherwise damaged in transit.

Deliver fertilizer in waterproof bags showing weight, chemical analysis, and name of manufacturer.

MAINTENANCE SERVICE A.

Sections 017300 - Execution and 017700 - Closeout Procedures: Requirements for maintenance service.

Maintain seeded areas for three months from Date of Substantial Completion.

PART 2 PRODUCTS 2.1

SEED MIXTURE A.

Furnish materials in accordance with applicable federal, state, and municipal standards.

The seed mixture shall be a cool season mixture with the following: 80% Kentucky 31 Tall Fescue 20% Red Clover

2.2

The germination rate shall be 85% to 90%, but no less than 85%.

Seed must be clean and relatively free of weed seed and other contaminants.

Certified seed is preferred but not required.

Perform proper seed inoculation either by using pre-inoculated seed (must be used prior to expiration date on inoculum tag) or inoculating the seed with the appropriate inoculum within 24 hours prior to seeding. Inoculated seed will not be exposed to direct sunlight.

ACCESSORIES A.

Mulching Material: Oat or wheat straw, free from weeds, foreign matter detrimental to plant life, and dry. Hay or chopped cornstalks are acceptable. 329219- 3

Section 329219 Seeding BVPS Ash Impoundment Closure

2.3

Fertilizer: Commercial grade; recommended for listed grass mixture; of proportion necessary to eliminate deficiencies of topsoil, as indicated by topsoil testing (Section 310513), to the following proportions: Nitrogen 30 percent, phosphoric acid 30 percent, soluble potash 30 percent.

SOURCE QUALITY CONTROL A.

Section 014000 - Quality Requirements: Testing, inspection and analysis requirements.

Provide recommendation for fertilizer and lime application rates for specified seed mix based topsoil testing (Section 310513).

PART 3 EXECUTION 3.1

3.2

3.3

EXAMINATION A.

Section 013100 – Project Management and Coordination: Verification of existing conditions before starting work.

Verify prepared soil base is ready to receive the Work of this section and limit preparation of areas to be seeded so that planting occurs soon after.

FERTILIZING A.

Apply fertilizer at application rate recommended by soil analysis.

Apply after smooth raking of topsoil and prior to roller compaction.

Do not apply fertilizer at same time or with same machine used to apply seed.

Mix fertilizer thoroughly into upper 2 inches of topsoil.

Lightly water soil to aid dissipation of fertilizer. Irrigate top level of soil uniformly.

SEEDING A.

Do not use seed which is wet, moldy, or otherwise damaged.

Apply seed at rate of 4 lbs per 1000 sq ft evenly in two intersecting directions. Rake in lightly.

Perform seeding of cool season grasses in the appropriate planting period.

329219- 4

Section 329219 Seeding BVPS Ash Impoundment Closure

3.4

3.5

The fall planting period from August 1st and October 15th

Dormant planting period from December 1st to March 15th.

Do not seed areas in excess of that which can be mulched on same day.

Do not sow immediately following rain, when ground is too dry, or when winds are over 12 mph.

Sow seed using mechanical power-driven drills or seeders, or mechanical hand seeders, or other approved equipment.

Lightly rake seed into soil followed by light rolling or cultipacking.

Immediately protect seeded areas against erosion by mulching.

Spread mulch in continuous blanket using 1-1/2 tons per acre to a depth of 4 or 5 straws. Immediately following spreading mulch, anchor mulch using a rolling coulter or a wheatland land packer having wheels with Vshaped edges to force mulch into soil surface.

Protect seeded slopes against erosion with specified erosion control blanket or other methods approved by Design Professional

HYDROSEEDING A.

Apply fertilizer, mulch and seeded slurry with hydraulic seeder at rate of 5 lbs per 1000 sq ft evenly in one pass.

After application, apply water with fine spray immediately after each area has been hydroseeded. Saturate to 4 inches of soil and maintain moisture levels two to four inches.

SEED PROTECTION A.

Identify seeded areas with stakes and string around area periphery.

Cover seeded slopes where grade is 3H:1V or greater with erosion fabric. Roll fabric onto slopes without stretching or pulling.

Lay fabric smoothly on surface, bury top end of each section in 6 inch deep excavated topsoil trench. Overlap edges and ends of adjacent rolls minimum 12 inches. Backfill trench and rake smooth, level with adjacent soil.

Secure outside edges and overlaps with stakes at 36 inch intervals.

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Section 329219 Seeding BVPS Ash Impoundment Closure

3.6

Lightly dress slopes with topsoil to ensure close contact between fabric and soil.

At sides of ditches, lay fabric laps in direction of water flow. Lap ends and edges a minimum 6 inches.

MAINTENANCE A.

Mow grass at regular intervals to maintain at maximum height of 2-1/2 inches. Do not cut more than 1/3 of grass blade at each mowing. Perform first mowing when seedlings are 40 percent higher than desired height.

Do not let clippings lay in clumps.

Water to prevent grass and soil from drying out.

Control growth of weeds. Apply herbicides. Remedy damage resulting from improper use of herbicides.

Immediately reseed areas showing bare spots.

Repair washouts or gullies.

Protect seeded areas with warning signs during maintenance period. END OF SECTION

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