10/16/2008 ENVIRONMENTAL OVERSIGHT COMMITTEE Minutes

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what is driving the pond and make recommendations as to how to proceed based on what the town is seeking from the pond. ENSR will use a formula to compare to the numbers being found in Santuit. Mr. Mitchell suggests that a good target number/"reality check"of 15-20 ppb. Responding to the Committees questions,Mr. Mitchell responded that yes,the calculations will be used for the modeling and phosphate budget. He also suggested that the 300' septic contribution tends to be a rule of thumb on some parts of Cape Cod, dependent upon the type of soil. Regarding phosphorus flux,ENSR will look at phosphorus in the sediment or obtain a phosphorus content sample with incubation. ENSR will likely use an estimate within a conceptual model. [slides 28-31.1 When ENSR proceeds to recommending pond restoration,the usage of the pond will be considered to determine at what level the pond will be cleaned up. In proceeding to restoration, a major consideration will be the cost. Tasks 4 and Tasks 5 will comprise the Diagnostic Summary Report which will summarize the study results, document the conditions, identify nutrient sources and evaluate possible restoration options. The format of the report will be conducive to the development of a TMDL. Responding to additional Committee questions,the final report would be suitable to use to create the TMDL, but there may be additional information needed,particularly regarding cranberry bogs. ENSR would have fairly detailed analyses available for meetings with the Committee and the public. In reference to bioremediation,Mr. Mitchell stated that there are no good case studies supporting it. [slides 32-351 The projected total for the project is$51,000 although the request for additional surveys may add an additional $5000-$10,000. As the study commences, and the information is pulled together, it will be supplemented with industrial data. The Committee had questioned scheduling meetings during the June to September 2009 timeframe,ENSR would like to begin sampling in April and feels it would be difficult to condense the schedule because the seasonal aspect is needed. ENSR could offer interim meetings to share the information with seasonal residents. It was also discussed that the information could be distributed, or taped, on local television or online at the town's website. [slides 33-381 ENSR wishes to begin the project in April to obtain seasonal variation sampling, but it is possible to make adjustments should it be necessary to accommodate a town meeting. Surface water, ground water and viewing the watershed area before the leaves open up make April an ideal month for beginning the study. The Committee discussed the possibility of initiating parts of the study should they be able to access grants to fund it. Mr. Mitchell will let the Committee know what the initial costs would be. The Chair asked if it would be possible to break down the tasks and costs by month. The Chair asked for more information regarding the Committee's goals to acquire a TMDL or mitigation plans for the pond. Mr. Mitchell responded that the nutrient levels will be looked at more closely, such as in stormwater, and address what can be done to rectify it or what the cost will be to correct it. The Chair asked for specific recommendations which may be needed for Town Meeting. Mr. Mitchell indicated that ENSR will spit up the report between data analyses and feasibility. ENSR will then take a look at the information to determine what treatment would make the most sense for this particular pond. ENSR would then include all of the costs of any alternatives that would be associated with any necessary implementation plan. Mr. Baker inquired whether or not the raw data would be shared with the town and would ideas be suggested as to how to fund the project. Mr. Mitchell responded that all of the raw data would be 5