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DRAFT Alternative Scenarios Analysis and Site Evaluation[sub page) <br /> Based on the Technology Screening Report,the Mashpee Sewer Commission identified five <br /> different wastewater management scenarios for further evaluation. They include leaving existing <br /> facilities in place and developing new facilities for unsewered areas, expanding existing <br /> facilities, assuming each Town in the watershed develops its own facilities using a standard <br /> percent nitrogen reduction for each community (called fair share), and centralized treatment. <br /> The analysis of the fifth scenario using NITREX TM technology in individual and cluster systems <br /> was prepared by Lombardo Associates. <br /> Scenario 1: Existing Facilities and New Facilities: Continues operation of existing private <br /> WWTFs and constructs additional facilities to achieve nitrogen reduction. New WWTFs are <br /> located at Sites 2, 4, 6 and 11 and new recharge locations are at Sites 1, 2, 4, 7 and 11. The <br /> scenario assumes approximately 380 properties would be on new I/A systems. <br /> Scenario 2: Upgrade and Expand Existing Facilities: expands existing WWTFs to the extent <br /> feasible to address adjacent areas and enhance nitrogen removal. The WWTFs sites are the same <br /> as Scenario 1. The recharge sites are the same, except that Site 1 is eliminated. The scenario <br /> assumes approximately 50 properties on new I/A systems. <br /> Scenario 3: NitrexTM: This scenario proposed cluster systems and individual I/A systems using <br /> Nitrex technology. <br /> Scenario 4: Fair Share: An overall percent reduction of nitrogen for the Popponesset and <br /> Waquoit East watersheds is determined for each community to remove. New WWTF sites are <br /> located at Sites 4, 6 and 11 and new recharge sites are at 4, 7 and 11. The scenario assumes <br /> approximately 130 properties would be on new I/A systems. Each Town would develop its own <br /> facilities rather than sharing facilities as in the other four scenarios. <br /> Scenario 5: Centralized Treatment: Wastewater treatment takes place at a centralized <br /> (municipal)treatment plant. A plant at Site 4 (in the Popponesset Bay watershed) would treat <br /> flows from both watersheds and recharge at multiple sites within the two watersheds. Each of <br /> the existing private WWTFs (except New Seabury) would become a pumping station. New <br /> Seabury would continue treating wastewater. The Forestdale School would serve as a pumping <br /> station for flow sent to another new WWTF located on Site 11 in Sandwich. The new WWTFs <br /> are located at Sites 4 and 11 and new recharge sites are 1, 4, 5, 7 and 11. The scenario includes <br /> approximately 120 properties on new I/A systems. <br /> A site evaluation was also prepared for use with each of the five scenarios. Thirteen sites were <br /> evaluated for treatment facilities and treated wastewater recharge. Some were considered for <br /> recharge only; others were considered for both. The evaluation included criteria such as <br /> ownership, land use,proximity to sensitive receptors such as schools. Nine sites were carried <br /> forward for further development. The sites and the potential uses are listed below. <br /> [Box list below] <br /> 9 <br />