Friends of Farm Pond, Oak Bluffs MA

Culvert Feasibility Replacement Study

Culvert Feasibility Replacement Study

Posted September 13th, 2007

It should be noted the Farm Pond would not qualify for the program that funded this project as in the RFP if Oak Bluffs was not listed as an eligible town and the work under this funding had to be within the Buzzard’s Bay watershed.

Services Required

  1. Develop an Existing Conditions Survey including existing road layout, location of utilities topography and delineation of adjacent wetland resource areas.
    Essentially done, but may need some refinements. The Town has ordered sub-foot GPS equipment ($9,500) to gather that data.

  2. Develop a map of the pond substrate including a laboratory analysis of the accumulated sediment.

    Not done yet but will be needed to establish dredge material disposal. The current culvert maintenance permits approve the material for dune restoration

  3. Complete a topographic survey of the shoreline of the pond from the waterline to an appropriate elevation (NAVD Mean Higher High Water) to predict a future maximum elevation resulting from increased flushing. The survey should include the location and impacts of any structures affected by the increased tide elevations. One foot elevation contours should be shown on the plan

  4. Conduct a hydraulic analysis to determine the appropriate culvert replacement to provide maximum tidal exchange without adverse impacts. The analysis must be sufficient to meet the requirements of all permitting agencies.
    Currently being refined using surveying data gathered (see #3)

  5. Provide an analysis of impacts to the pond (depth, vegetation, water quality, and habitat) with regards to culvert replacement and tidal flows. The focus of the analysis should be on (but not limited to) regulated resources for permitting purposes.
    Being prepared – will be needed before permitting can be sought.

  6. Determine if and how much sediment should be removed to improve water quality in the pond and maintain an open water environment.
    In progress

  7. Develop sediment disposal options for dredge materials
    This decision will be based on results of grain size data (#2)

  8. Design a culvert structure (and flood control mechanism if necessary) including material and installation specifications
    To be designed based on results of above objectives

  9. Prepare an estimate of probable cost of implementing (construction, dredging, disposal of sediment, etc.) the recommended design and restoration strategy.
    Dependant on design of solution

  10. Develop a permitting strategy for all aspects of the restoration plan
    This is known but can not formally begin until all the above is completed. However discussions with regulators have been ongoing.

We have composed a species inventory list of species in the pond itself as well as the marshes and the uplands that the Land Bank owns. We have identified over 180 species; so there is fair biodiversity (within Town budget).

We took 200 half meter samples and have an estimated population of the steamer clams and quahogs (within Town budget)

Eelgrass mapping of the pond was done in 1998 (DEP funded) and again in 2006 (MVC and Town).

Current work in addition to the ten goals identifies in the Buzzards Bay project:
Continue to compiling the species inventory list (town budget).
Continue to monitor water quality (currently funded through MVC grant)
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