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Mashpee Sewer Commission &Town Manager <br /> August 5, 2010 <br /> Page 3 <br /> geologic information & nitrate data from nearby Waterloo Profiling locations. Installation <br /> would be via insertion through single DP rod equipped w/disposable tips. Assuming that <br /> formation will collapse around CMT tubing (confirm in field). Perform slug tests in CMT <br /> wells to estimate K. <br /> d. Survey CMT locations & elevations w/ portable survey equipment or GPS. Measure static <br /> water levels in CMT wells. <br /> e. Install passive diffusion bag (PDB) samplers at locations shown in green dots (Optional). <br /> PDBs would be constructed of 1.5 inch flat dialysis tubing enclosed in 1 inch by 4 inch <br /> porous plastic tubes equipped with polyethylene caps. PDBs would be deployed at shallow <br /> depths in shallow sediment at low tide (6 inches +-) & marked with flagging. The PDBs <br /> would be left in place for about one week and then retrieved. Water from the PDBs would <br /> be tested for nitrate using the Hach test kits or a fixed laboratory. <br /> Task 2.3 — Data Analysis & Report Preparation <br /> a. Analyze data, construct supporting graphics and tables, prepare report <br /> Task 3 Pirates Cove Analytical Groundwater Model <br /> LAI will create a robust analytical groundwater model of the Pirates Cove peninsula. MODFLOW <br /> particle tracking flow lines, or equivalent visual representations, will be provided. <br /> Task 4. Identification and Evaluation of Alternative Groundwater Treatment Options and <br /> Selection of a Preferred Option <br /> Using the results of the previous Tasks, LAI will develop alternative groundwater treatment options <br /> and will prepare a preliminary layout and opinion of cost of each option. The options are expected <br /> to include: <br /> 1. Shoreline Groundwater treatment via permeable reactive barrier (PRB) <br /> 2. Road shoulder groundwater treatment via permeable reactive barrier (PRB) with shoreline <br /> properties treated with either: <br /> a. Cluster wastewater treatment system <br /> b. New drainfields upgradient of the PRB <br /> 3. Groundwater drain to a Nitrex denitrification unit and then infiltration trench to recharge the <br /> aquifer with groundwater with nitrogen removed. <br /> The preferred option will be defined collaboratively with the Mashpee Sewer Commission and <br /> Pirates Cove community to optimize siting, nitrogen removal and minimizing costs. LAI will prepare <br /> the Preferred Option preliminary design and cost estimate, in sufficient detail for use with a State <br /> Revolving Fund (SRF) Program Green Reserve grant application. <br /> Task 5. Meetings with the Sewer Commission and Pirate's Cove Community <br /> Presentations will be made to the Mashpee Sewer Commission and Pirates Cove community on <br /> the activities and results of the above tasks, occurring at the completion of Tasks 2/3 and 4 to <br /> solicit comments and to develop consensus on the optimal Preferred groundwater treatment <br /> Environmental[engineers/Consultants <br /> ® S 4 t} <br />