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Flushing Proposal <br /> This.is a proposal to reduce Mashpee's Nitrogen pollution in the Popponesset and Waquoit watersheds. . <br /> Quantifying the present Waste Water Nitrogen contribution to the Mashpee watersheds: <br /> 1.10,000 household "units" <br /> 2.2.5 persons per unit producing a total of 125 gallons of WW per day <br /> 3.8500 Units on Title 5 systems yielding 25 Mg. N/L <br /> 4. 1200 units on private systems yielding 15 Mg. N/L <br /> 5.300 units on I/A systems yielding 15 Mg. N/L <br /> Total volume 1,250,000 gallons of WW per day. <br /> Annual Nitrogen impact of WW on Mashpee's Watersheds: <br /> 8,500 x 25 Mg. N/I = 212,500 <br /> 1,200 x 7 Mg. N/L = 8,400 <br /> 300 x 15 Mg. N/L = 4,500 <br /> 10,000 Total units 225,400 <br /> 225,400/10,000=22.54 Mg.N/L for average unit output <br /> 22.54 Mg.N/L x 3.785 L/gallon=85.31 Mg.N/gal <br /> .085 Grams N/gal x 1,250,000 gal/day= 106,250 Grams N/day <br /> 106,250 GramsN/day / 454 Grams/lb. =234 lbs. day <br /> 234 Ibs.N x 365 days = 85,421 Ibs.Nitrogen per year in our WW <br /> This is the equivalent of 8,500 50#bags of 20% Nitrogen fertilizer <br /> "Flushing" concept is to reintroduce WW at 3 Mg.N/L into the upper portions of the watersheds. This can be <br /> accomplished by upgrading the existing private WW plants to yield 3 Mg.N/L, upgrading their volume where <br /> practical, and building enough new capacity at 3 Mg.N/L to process 50%of Mashpee's total WW volume from <br /> high density areas. Since these units and plants are in the upper portions of our watersheds, the low-Nitrogen <br /> WW will,through dilution,flush Nitrogen from the watersheds and aquifers. <br /> The impact of processing 625,000 Gallons/day to 3 Mg.N/L would remove 37,006 Ibs.N/year or 43% of <br /> Mashpee's WW Nitrogen from the upper portions of our estuaries.The reduction in Nitrogen loading plus the <br /> long "dwell time" of low Nitrogen WW will help leach Nitrogen out of the estuaries.The balance (50%) of the <br /> town's WW,from low density areas, by definition/location,contribute less than half of the Nitrogen pollution.- <br /> Attenuation, declining household members, and actual water use closer to 30 Gal. per Day per person vs. the <br /> 50 Gal per day used for the "Flushing" calculations means the actual Nitrogen impact from present WW <br /> volume is considerably less. Implementation of this proposal can quite possibly result in meeting mandated <br /> levels. <br /> JNL4/18/2011 <br />