Mamaroneck Mill Pond Presentation

Kearny Building Solutions www.kearneybuildingsolutions.com

Mamaroneck Van Amringe Mill Pond Flapper Valve Report.

5.13.10

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Table of Contents Van Amringe Mill Pond Aerial Photo

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Inspection Overview

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Investigation of exiting conditions

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Initial Investigation Work and Temporary Repairs for the Pond Side Flapper Valve.

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Initial Investigation Work and Temporary Repairs for the Sea Side Flapper Valve.

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Existing Pond Side Flapper Valve Assembly Schematics.

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Issue #1: Plate Thinning

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Issue #2: Hinge Erosion

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Issue #3: Flange Plate Gaps

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Issue #4: Pond Drainage

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Supporting CAD work

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Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Van Amringe Mill Pond Aerial Photo

Marina side Valve Area Pond side

Existing Dam

Sea side

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Inspection Overview Investigation of exiting conditions Tuesday May 12th and Wednesday the 13th 2010, Kearney Building Solutions crew investigated the pond side and ocean side “flapper valves� to review any assumed causes for the recent excessive water loss and ascertain any compromised parts to existing flow valve systems. We will outline our findings in the subsequent pages.

Initial Investigation Work and Temporary Repairs for the Pond Side Flapper Valve.

1. We removed the pond side flapper valve main plate to better understand the extent of erosion or damage to the plate itself and partially drain the mill pond to get a better view during the following low tide.

2. We investigated the valve and tube the next morning during low tide (5 a.m.).

3. After photos, measurements and minor repairs were made we reinserted the flapper plate.

Initial Investigation Work and Temporary Repairs for the Sea Side Flapper Valve.

1. We lifted the sea side flapper valve main plate and reattached the swing arm that had been broken loose.

2. We raised the valve flap into a high or open position to allow the free flow of water in and out of the pond 3. We allowed for easy readjustment of the valve at a future date.

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Existing Pond Side Flapper Valve Assembly Schematics.

Concrete Bulkhead Water Tube

Flange Plate Hinge Mechanism

Flapper Valve

Flange Lip

Flapper Valve Mechanical Drawing Please use this drawing as a reference for the valve mechanics and language used throughout this report.

Flapper Valve View From Bridge

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Issue #1: Plate Thinning

Concrete Bulkhead Water Tube

Flange Plate Hinge Mechanism

Flapper Valve

Flange Lip

Flapper Plate Thinning The normally 1” plate has reduced to 1/4” in this section of the valve plate. it is our assessment that this is a major reason for excessive water leaking through the valve in the closed position.

Extreme water infiltration

Plate is a1/4” thin at edge Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Issue #2: Hinge Erosion

Concrete Bulkhead Water Tube Hinge arm # 2

Hinge Mechanism

Hinge arm #1

Hinge arm #1 almost eroded through

Flange Plate

Hinge arm # 2

Flapper Valve

completely eroded through

Flange Lip

Flapper Plate Eroded Hinges The large hinge brackets have eroded to the point of failure. THis has tipped the plate enough to angle it and allow more water to pass through.

Plate is a1/4� thin at edge Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Issue #3: Flange Plate Gaps

Concrete Bulkhead Water Tube

Flange Plate Hinge Mechanism

Flapper Valve

Flange Lip Flange Plate Eroded Connections Plate is 2� from

and Related Gaps

concrete bulkhead

The connections of the Flange plate and the concrete bulk head has pulled away due to ice heaving. the connecting bolts are not able to keep the plate secure.

Plate is 2� from concrete bulkhead

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Issue #4: Pond Drainage The Pond near its lowest level still was only halfway down the diameter of the pipe.

Full drainage for service and otherwise may always be a challenge do to that the 12 hour periods between low tides does not allow for full drainage of the pond. Multiple attempts may work but all valves must be in good working condition to do so.

Interior Valve View: Photo of minimum low tIde drainage level after one 12 hour attempt.

Exterior Valve View: Photo of minimum low tIde drainage level after one 12 hour attempt.

Plate is a1/4� thin at edge Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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Mamaroneck Van Amringe Mill Pond Flapper Valve Report. 5.13.10

Supporting CAD work

2" 1"

7'-0" 2'-11 3/4"

2"

7 1/2"

6'-3"

7'-0"

3"

6"

6'-2"DIA

1/2"

1"

Flapper Valve Side Elevation - NOT TO SCALE

Flapper Valve Front Elevation - NOT TO SCALE

Kearny Building Solutions Mamaroneck, NY 914.263.4959 info@KearneyBuildingSolutions.com www.kearneybuildingsolutions.com

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