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5 <br /> Sewer Commission <br /> Minutes <br /> March 21, 2019 <br /> In Phase 1, Areas A&D (Site 4) flows and treatment loading would be developed as part of the preliminary <br /> design. The average annual flow is anticipated as 120,000 gallons per day. It was noted that additional <br /> homes may be constructed in this area which would require additional review. <br /> It was suggested the project seek to intercept the leachate from the landfill for treatment. There may be records <br /> of significance from monitoring and from test wells. This is a capped landfill that may require its own pump <br /> and treat for possible collection and recharge. The Board of Health would be consulted regarding the <br /> availability of nutrient level records, specifically nitrogen for possible treatment. A requirement of SRF <br /> funding is to have sustainability within this project, It was recommended that potential energy initiatives such <br /> as solar panels be considered at the landfill. <br /> The general wastewater process involves preliminary/primary treatment(screening & grit removal), secondary <br /> treatment(removal of biodegradable organic matter, suspended solids and nutrient removal), advanced tertiary <br /> treatment(advanced nutrient removal),disinfection,solids handling, effluent recharge and support facilities. <br /> In the general wastewater process,two options were presented. In the Membrane Bioreactor(MBR) option <br /> there are screening requirements and grit removal in the preliminary treatment process followed by secondary <br /> tertiary treatment and UV disinfection. The MBR system would be designed to handle a flow through process <br /> treating maximum conditions of peals flow. <br /> Using the Sequencing Batch Reactor(SBR) option,there is preliminary treatment(screening&grit removal), <br /> secondary treatment,tertiary treatment(dinitrogen filter) and UV disinfection. <br /> Phase I of the project scope would be designed appropriately and in the most cost effective manner while <br /> considering incremental growth. It was suggested that due diligence be conducted regarding the additional <br /> contaminants(phosphorus, etc.)to be removed in the process. <br /> With information and technology selection,the costs of phasing would be developed. MBR is noted to be more <br /> expensive than SBR. Although it was noted the MBR(membranes)provide a higher level of performance in <br /> terms of the removal of other undesirable contaminants. <br /> Cost development is based on technology selection, sewer service size area and modular design and phasing. <br /> Costs are based on the decisions made during preliminary design and will be used in the development of Town <br /> appropriations. Changes or expansion of set vice over Phase I will impact costs. <br /> The Project Schedule involves draft deliverables to the Sewer Commission in August of 2019. With Town <br /> review and continent Value Engineering meetings are anticipated to begin in October 2019. Final deliverables <br /> are proposed in November with projection completion in December 2019. <br /> It was suggested the process begin to select VE set-vices, a consulting engineering firm other than GHD, Inc. <br /> Firms that have evaluated other wastewater treatment plants with experience in the design of membrane systems <br /> and SBR's are preferable. Procedurally,the Sewer Commission would advertise in the Central Register seeking <br /> VE services. <br />