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Town of Mashpee <br /> Review of Proposed Plan Memo <br /> December 16, 2010 <br /> Page 3 of 3 <br /> It is LAI's opinion that the Proposed Plan, which does not appear to assume removal in the <br /> Sandwich portion of the subwatershed, removes significantly less than Scenario 3R. It is noted that <br /> the areas in question are largely within Sandwich, and that if the Sandwich portion is 100% <br /> sewered, the portion of Mashpee that lies above Mashpee / Wakeby Pond may not require <br /> sewering. <br /> However it is noted that, despite the high degree of pond attenuation associated with discharges in <br /> this area, it does not appear that the TMDL threshold concentrations will be met without Sandwich <br /> sewering close to 100% of their portion of the Mashpee River watershed. <br /> Given the high level of attenuation in the areas north of Mashpee/Wakebv Pond, reducing <br /> or removing the Transfer Station, Heritage Park and any other planned discharges to this <br /> subwatershed will have a profound effect on the number of properties requiring sewers in <br /> this area of the subwatershed. <br /> Popponesset Bay <br /> For the limited areas that discharge directly to Popponesset Bay without passing through one of the <br /> above subwatersheds, the nitrogen removal in the Proposed Plan is comparable to Scenario 3R. <br /> However, Popponesset Bay nitrogen levels are mostly a function of the nitrogen loads coming from <br /> the contributory subwatersheds. As seen in Table 5, there is little excess capacity. Increasing the <br /> loads from any of the contributory subwatersheds above the Scenario 3R loads runs a high risk of <br /> not meeting the TMDL at the sentinel station in Popponesset Bay. <br /> Nivironmental Engineers/Consultants <br />