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SIMPLE MATH <br /> DETERMINING RESULTS <br /> STAGE ONE IMPACT MASHPEE SEWER SYSTEM <br /> This is a simple exercise to determine what the result woud be for Mashpee to upgrade existing plants <br /> and build new plants to service the high density portion of the town(assuming 50%of total residents) <br /> This exercise also assumes upgraded and new plants would yeild .003 Mg N/L waste water Vs.an average <br /> of.035 Mg N/L from present systems. <br /> Waste Water Assumptions: <br /> 10,000 homes with 2.5 persons producing 125 gallons of waste water per day <br /> 35 Mg N/L-35 milligrams of Nitrogen in that waste water(averaging systems) <br /> Systems in use-8500 Title 5,1200 on private,and 300 with I/A <br /> Nitrogen compounds in Today's waste water from 10,000 homes: <br /> 1,250,000 gallons per day containing.035 Mg N/L is as follows: <br /> 1,250,000(365 days)(3.8 L/gal.)(.035 Mg N/L)/(448 g/lb.)=135,780 pounds per year <br /> Stage one 50%of town(high density areas)with Upgraded existing plants and new capacity at.003 Gr N/L <br /> 625,000 gallons per day containing.003 Mg N/L is as follows: <br /> 625,000 G(365 days)(3.8 L/G)(.003 Mg N/L)/(448 g/lb.)=5840 pounds per year <br /> Balance of town at completion of stage one: <br /> 625,000 gallons per day containing.035 Gr N/L average is as follows: <br /> 625,000 G(365 days)3.8 L/G(0.35 Mg N/L)/(448 g/1)=67,890 pounds per year <br /> The effect of stage one completion compared with present systems in use. <br /> Stage one leaves 5840 lbs plus 67890 lbs or 73,730 pounds per year <br /> 135,780 lbs.(now)-73,730 lbs.(with stage one) = 62,050 lbs. (54%reduction) <br /> 10,000 homes now average.035 Mg N/L after stage one will average .019Mg N/L <br /> Positive Mitigating cercumstances: <br /> Personal use of water is closer to 30 gallons per day than the 50 gallons used above. <br /> This factor alone reduces the above impacts by 40% <br /> The homes not in the"high density"stage one area are further from impact areas. <br /> This factor means attenuation reduces their impact below the.019 Mg N/L ave. <br /> Previous population growth rates are at this time unsustainable <br /> This factor reduces"previous" build out senarios <br /> Acquiring recreational and conservation areas by the town will continue <br /> This will continue to reduce the"previous" build out senario <br /> Persons per household is declining in Mashpee <br /> This factor means average household impact is less <br /> As available land is reduced, more multiple units are built(condos and apartments) <br /> Mashpee requires them to build private waste water systems(0 impact) <br /> Storm water runoff is now being diverted to reduce impact <br /> This will reduce the Nitrogen compounds reaching our watersheds <br /> Estuaries can be dredged to enhance tidal flow <br /> This will reduce Nitrogen in our estuaries <br /> Ponds can be cleaned up with I/A systems,sewers,prohibitions,and aeiration <br /> This will allow natural attenuation to recover in these areas <br />