Allison Street Flood Protection System Certification Project Mount Rainier July 18, 2015
Presentation Overview Existing Allison Street Levee Levee Certification Program Allison Street Levee Certification Work
Allison Street Pumping Station Rehabilitation
Levee System Raising and Extension
34th Street Bridge Replacement
Project Limits Arundel Road Green Street Concepts Project Schedule
Allison Street Levee
Constructed by the Washington Suburban Sanitary Commission (WSSC) in the 1980s An extension of the US Army Corps of Engineers (USACE) Anacostia Levee System, constructed in the 1950’s Certification work is almost complete on the Anacostia Levee System
Project Area
Existing Allison Street Levee System
Levee Certification Program Following the disastrous impacts of Hurricane Katrina in 2005, the USACE initiated a nationwide evaluation of levee systems In 2007, County entered into agreement with FEMA to update County FEMA Flood Insurance Rate Maps (FIRM) 44 CFR 65.10 requires that a levee accredited by FEMA and shown on a FIRM be certified by a Professional Engineer or a Federal Agency Prince George’s County Evaluation Report, October 2010, identified work elements required on the Allison Street Levee System to meet 44 CFR 65.10 and be certified
FEMA Flood Insurance Rate Maps FEMA FIRM New updated FIRM’s in process to be issued and scheduled Winter 2014 and 90-day appeal period and ultimate adoption of the DFIRM will follow. Levee Seclusion Method - FEMA will allow the non-accredited levee impact areas to be shown on the FIRM exactly as it is shown on the effective FIRM until the certification process is complete. Flood Insurance - Property Owners may not be required, but are always encouraged to purchase flood insurance.
Certification Projects Overview Improvements to obtain certification include: Rehabilitate Allison Street Pumping Station Levee System 
Raise system embankments and walls

Extend levee system at 31st Street and Chillum Road
Replace 34th Street Bridge
Rehabilitate Allison Street Pumping Station Pumping station located at 3400 Chillum Road Constructed in mid-1980s, mostly original equipment Purpose of pumping station is to move interior drainage to channel area Rehabilitation includes:
Update electrical, mechanical and ventilation systems,
Install new exterior generator
Repair exterior concrete
Levee Raising Requirements
Raise Levee Embankments
Where required, embankments will be raised 0.5 feet to 3 feet
Raise Levee Walls
Raise Levee Walls
Where required, levee walls will be raised 0.5 feet to 3 feet
Potential Wall Treatment
Photo examples of wall treatment
Rendering of stained wall treatment
Other Potential Wall Option Town could initiate a project to design and install a Wall Mural for a section(s) of the floodwall. • If location is identified, the County will not stain the wall but leave
it “open” and available for mural installation.
• The mural would need to be reviewed and approved by the Town. • The County would also need to review the proposed mural
materials and installation techniques.
• The mural would be installed and maintained by the Town.
Extend Levee – 31st Street Levee Wall with proposed Formline Finish and Top Fence
Click to edit Master text styles Second level
● Third level
● Fourth level ● Fifth level
The levee wall extension is required to “tie” levee into “existing high ground”
Extend Levee – Chillum Road
Replace 34th Street Bridge
Replace 34th Street Bridge Proposed Improvements AN AN CH ET BU TRE S
L RO ARUNDE AD
PROPOSED BRIDGE
CH
EE TR T
LC DE UN AR
REET
AL AN
T ALLISON S
S AN AN CH BU
34th STREET
0’ G6 Y N I T A S EX I T O F W H RIG
M LU L I
AD O R
Replace 34th Street Bridge
Replace 34th Street Bridge Traffic Impacts During Phased Construction • One way
traffic during construction.
• Pedestrian
access will be maintained.
Additional Elements/Considerations
Additional Elements/Considerations
Wall to be closed County will work with the community, town, property owner, and emergency services on the closure
Vegetation and Structure Free Zone 44.CFR 65.10 and USACE require no structures (poles, barricades, guardrail post) or trees/vegetation within 15 feet of levee embankment or levee wall Tree removal will be required County will provide tree replacement and will work with Communities for tree planting locations County is evaluating tree replacement sites provided by the Town
Vegetation and Structure Free Zone
Temporary Construction Impacts Mt. Rainier North Neighborhood Park • •
M-NCPPC suggested that maybe the park should be closed during construction. The County concurs with this recommendation due to safety concerns.
Potential Storage and Stockpile Locations 1. 2.
Mt. Rainier North Neighborhood Park M-NCPPC property at corner of 34th Street and Buchanan Street
The use of these locations will be coordinated with MNCPPC and included in the Right of Entry agreement
Arundel Road Green Street
Arundel Road existing conditions
Arundel Road Green Street
Is this the right location for a green street? Considerations include: • Proximity to Flood Protection Wall • Potential Signal Impacts • ADA Compliance • Lane width limitations • Project Costs • Actual Water Quality benefit/treatment
Arundel Road Green Street Concept
Add an 8’ landscaped median Remove parking on the north side of Arundel Rd Add Bump Outs at all intersections Narrow intersection at 31st Street Add Rain Gardens in the open space and bump out near 34th St. Decorative crosswalks throughout Estimated Cost $957,000
Arundel Road Green Street Concept
Considerations: Median provides space for planting up to 25 new trees Calms traffic with a median and bump outs Provides a hiker biker loop around the river Less likely to require modifications to the signal at 34th St. Creates a potential traffic hazard with single lanes on either side of the median where no cars can pass disabled vehicles – could delay emergency response vehicles Loss of parking on the north side of the street Lane width are more narrow than County Traffic Safety Division would approve
Flood Protection Project Schedule Project
Allison Street Pumping Station Levee System Raising/Extension and 34th Street Bridge Replacement
Estimated Construction Start
Duration
Estimated Completion Date
Summer 2015
12 months
Fall/Winter 2016
Winter 2016
24 months
Winter 2018
Other items to be completed to obtain certification include: 
Flapper gate, sluice gate, and pipe closure deficiencies addressed, to be reinspected for final system certification
Public Involvement County will provide website updates and continue to coordinate with stakeholders:
Prince George’s County DER website: http://www.princegeorgescountymd.gov/DER/
Go to the Department of Environmental Resources Web site located at http://www.princegeorgescountymd.gov/DER/. Under the heading of Upcoming Events, click on the link titled Allison Street Levee System Project Status.
Mount Rainier community listserv
City of Mount Rainier
Project Contact Information Jignesh Sheth, Project Manager and Primary Contact Department of the Environmental Stormwater Management Division Capital Projects Section 1801 McCormick Drive, Suite 500 Largo, Maryland 20774 Phone: (301) 883-5670 E-mail: JSheth@co.pg.md.us
Questions and Answers