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May 14, 2014 RAMSHORN POND DAM REHABILITATION PUBLIC INFORMATION SESSION PARE CORPORATION, FOXBORO, MA Allen R. Orsi, P.E., Managing Engineer.

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Presentation on theme: "May 14, 2014 RAMSHORN POND DAM REHABILITATION PUBLIC INFORMATION SESSION PARE CORPORATION, FOXBORO, MA Allen R. Orsi, P.E., Managing Engineer."— Presentation transcript:

1 May 14, 2014 RAMSHORN POND DAM REHABILITATION PUBLIC INFORMATION SESSION PARE CORPORATION, FOXBORO, MA Allen R. Orsi, P.E., Managing Engineer

2  Additional Evaluations  Proposed Design Approach  Additional Design Considerations OUTLINE

3  Upstream Membrane Option ADDITIONAL EVALUATIONS

4  Upstream Membrane Option ADDITIONAL EVALUATIONS

5  Toe Drain Impacts  Reviewed improvements provided by downstream toe drain  Existing Seepage Exit Gradient Factor of Safety = 1.2  With Toe Drain Exit Gradient Factor of Safety = 2.0  Dam safety practice designs for a Factor of Safety = 5.0 ADDITIONAL EVALUATIONS

6  Opinions of Cost  Significant cost impacts associated with contingencies and early stage of design ADDITIONAL EVALUATIONS

7  Recommended Approach  Upstream Cutoff Wall  Durability  Permittability  Schedule  Drawdowns ADDITIONAL EVALUATIONS

8  Proposed Site Plan DESIGN APPROACH

9  Proposed Spillway DESIGN APPROACH

10  Proposed Low Level Outlet DESIGN APPROACH

11  Proposed Upstream Wall DESIGN APPROACH

12  Proposed Parking DESIGN APPROACH

13  Proposed Public Access DESIGN APPROACH

14  Proposed Drainage DESIGN APPROACH

15  Control of Water  Drawdowns  Bypass / Flow Maintenance  Cofferdams  Construction Phasing  Detours / Road Closure  Public Access Information / Signage ADDITIONAL DESIGN CONSIDERATIONS

16 QUESTIONS


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