1/17/2013 SEWER COMMISSION Minutes

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Table 1. Scenario Watershed Nitrogen Loads: Popponesset Bay Attenuated total nitrogen loads by subembayment and surface water input to Popponesset Bay are presented for each Mashpee Sewer Commission scenario. All scenarios loads are based on build-out nitrogen loading conditions using the updated SMAST unified land use database;MEP build-out loads are presented for comparison(a build-out load for the unified database was not a requested scenario). Loads do not include atmospheric deposition onto the sub-embayment surface or benthic flux loading terms. "Threshold"load is from the scenario used in the MEP technical report to meet the N threshold levels in the Bay. MEP Buildout Scenarios(all are buildout conditions) sub emhayment load threshold threshold Option IA Option 1B Option IC (kg/day) (kg/day) /o change (kg day) % (kg day) % (kg day) % chan e chan e chang Popponesset Bay 1.98 1.82 -8.1% 0.66 -66.7% 0.66 -66.7% 0.66 -66.7% Popponesset Creek 5.35 0.95 -82.2% 1.01 -81.1% 1.01 -81.1% 1.01 -81.1% Pinquickset Cove 0.98 0.76 -22.0% 0.72 -26.5% 0.72 -26.5% 0.72 -26.5% Ockway Bay 316 0.76 -76.0% 0.95 -69.9% ( 1.92 -39.4% 1.90 40.0% Mashpee River 1713 2.50 -85.4% 3.82 -77.7% 4.13 -75.9% 4.13 -75.9% Shoestring Bay 9.76 2.26 -76.8% 4.12 -57.8% 2.62 -73.1% 4.20 -56.9% Surface Water Sources Mashpee River 30.31 13.67 -54.9% IL81 -61.0% 13.56 -55.3% 13.93 -54.11% SantuitRiver 20.55 11.47 -44.2% 11.18 -45.6% 11.09 -46.0% 14.70 -28.5% Quaker Run River 6.62 5.98 -9.6% 2.10 -68.3% 2.10 -68.3% 2.10 -68.3% TOTAL 95.84 40.18 -58.1% 3636 -62.1% 37.81 -60.5% 43.34 -54.8%