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Coastal Systems Program <br /> School for Marine Science and Technology <br /> University of Massachusetts Dartmouth <br /> 706 South Rodney French Blvd. <br /> New Bedford, MA 02744-1221 . <br /> MEP Technical Memo <br /> To: Tom Fudala,Chair,Mashpee Sewer Commission <br /> From Ed Eichner,Brian Howes CSPISMAST <br /> Sean Kelley,John Ramsey ACRE - <br /> Date: November 13,2009 <br /> Re: Report on Unified Database and Requested MEP Scenarios <br /> At the request of Mashpee Sewer Commission,two tasks were undertaken relative to evaluating <br /> nitrogen management alternatives for the Town of Mashpee: 1)develop a unified database of <br /> the land and water-use information in the Popponesset and East Waquoit Bay watersheds and 2) <br /> evaluate five(5)wastewater management scenarios, related to each estuarine system,using the <br /> unified database with a revised version of the Massachusetts Estuaries Project(MEP)linked <br /> model. Each of these tasks and a summary of their results are described below. <br /> Unified Database Timeline <br /> In order to provide a better context for why these tasks were completed, it is useful to review the <br /> timeline of MEP Technical Team involvement in assessments of Popponesset and East Waquoit <br /> Bay. In September 2004,the MEP Technical Team released the Popponesset Bay Technical <br /> Report and in January 2005,the East Waquoit Bay Technical Report was released. The <br /> nitrogen thresholds in these Technical Reports eventually were approved as Total Maximum <br /> Daily Load(TMDL)limits by the US Environmental Protection Agency_3.4 <br /> Both Final MEP Technical Reports were released along with MEP Data Disks containing the <br /> watershed nitrogen loading models and the underlying GIS land use,parcel, and build-out <br /> information. Collectively, the loading models relied on town-supplied information based on the <br /> following: <br /> Mashpee land use 2001, water use 1997 through 1999 <br /> Sandwich land use 2000, water use 19998 through 2000 <br /> Barnstable land use 2000, water use 1998 through 20M <br /> Falmouth land use 2001,water use 2000 <br /> Build-out information reviewed and approved by respective town planners <br /> In 2006, the Popponesset Bay MEP model was used by MEP Technical Team to evaluate five(5) <br /> watershed nitrogen management scenarios,which were funded by the MassDEP_5 Two scenarios <br /> with complete removal of wastewater N from selected subwatersheds were completed;both of <br /> these scenarios, which were based on existing watershed conditions,met the threshold <br />