10/18/2011 SEWER COMMISSION Minutes

Home Browse Search

u P. Area around Mashpee Rotary north along Great Neck Road 0. Future Wampanoag Village site north towards Town Hall R. Northeast of Santuit Pond S. West of Santuit Pond(south picking up neighborhoods west and south of Willowbend) T. Area along Hie,130 between Town Hall and Sandwich Additional designations include: Sandwich Sewersheds 1 through 9 were used again(includes the northern most part of Mashpee) Falmouth Sewersheds 1 through 17 Barnstable Sewersheds 37,38,39,42 Miscellaneous areas were also picked up including`areas of Mashpee outside the watersheds, Popponesset Island,areas within the watersheds anticipated to remain on septic systems, and some clusters of I/A systems like Sconset Village and the NitrexTA4 system located near Town Hall. It's important to note that although these Alternatives present a way of identifying where flows and loads are collected,treated,and discharged,it is the nitrogen discharge and its location that is the critical piece for this first step in the process,modeling through MEP.Within any alternative that is ultimately developed,there remains the possibility that flows could be"traded"for balancing purposes if it is determined to be more cost effective. For example, around Johns Pond some properties may end up potentially being served at the Backroads Site, while other areas might end up outside of the watershed. Most likely there will be some balance between the loads generated from Southport and those generated from the areas south and west of the pond.Once the Options are approved through MEP,the more difficult tasks of cost estimating,refining, and phasing of any alternative plan can take place, however that is not the purpose of this part of the analysis. 1 Option 1A Description This option was a modification to the first of two presented in the Spring of 2011.The primary goal was to look at sending as much flow as possible to the existing Rock Landing well site,under the assumption that these wells would be relocated in the future. The balance of flow would either be managed within the watersheds or remain as flow from septic systems. The first table outlines where/how each part of the project planning area is proposed to be served in the future and where the treated effluent from that area would be recharged in order to meet the TMDLs. In Option 1A the majority of the flow is proposed to be sent to the Rock Landing Well site,which would require the relocation of those water supply wells,the majority of the smaller WWTF would remain although treated at a higher level,and portions of Sandwich,Falmouth and Barnstable would be treated out of the watershed. Figure 1 shows the location and discharge areas summarized on the Table. 2 Option 1 B Description This option was developed after receiving comments from the Sewer Commission on Option 1A.The primary goal was to look at how wastewater might be managed if the Rock Landing and New Seabury discharge 4