point cover jan 13 - Boston Redevelopment Authority

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must retain the first inch of runoff and utilize it to replenish the groundwater table. The current design provides the required volume and utilizes a gravity driven leaching bed to achieve infiltration. The proposed infiltration system also addresses stormwater treatment following the DEP phosphorous treatment guidelines. Stormwater measures will be designed in accordance with DEP’s Massachusetts Stormwater Management Handbook. Table 5-1 summarizes the Article 32 infiltration volume calculations. Sanitary Sewage Existing Sewer System \\MABOS\projects\11381.00\reports\Article80\ Expanded_PNF\05_InfrastructureSystems_FI NAL.doc Table 5-1 Article 32 Infiltration Volumes Area 1-Inch Volume 24,000 sf 2,000 cf (14,960 gallons) 5-4 Infrastructure Systems Volume Provided 2,000 cf The BWSC owns and maintains the sanitary sewer lines in the vicinity of the Project Site. BWSC record drawings show there is a MWRA Sewer, a 66-inch collector sewer along the Riverway and Fenway. The sewers adjacent to the Project Site convey flow to this sewer. These include the 15-inch line along the site frontage in Brookline Avenue, a 24-inch by 3-inch line in Brookline Avenue and a 32-inch by 42-inch line in Boylston Street. Existing site uses generate approximately 1,442 gallons per day of wastewater. Proposed Sewage Flow and Connection For the purposes of estimating the sewage flow rates, the overall gross square footage (including mechanical space) is assumed instead of the FAR square footage in order to present a conservative analysis. Generation rates from the Massachusetts State Environmental Code (Title 5) were used. The Project’s approximately 320 residential units are projected to generate an estimated 45,100 gallons per day of sewage. The proposed retail use (up to 40,500 square feet) will generate approximately 2,025 gallons per day. The total generation for the Project is estimated to be approximately 47,125 gallons per day. These calculations anticipate a dry retail use. Inclusion of a restaurant use would increase sanitary flows and would be based on seats. The inclusion of a restaurant would add approximately 10,000 gallons per day resulting in a total flow of up to 57,125 gallons per day. At this stage of the design, options for potential sewer connections are being evaluated and will be coordinated with the BWSC. Since the Project is expected to generate new wastewater flows exceeding 15,000 gallons per day, filing of a Compliance Certification for Sewer Extensions for Sanitary & Industrial Connections of 15,000-50,000 gallons per day with DEP is required. If the total flow exceeds 50,000 gallons per day, a DEP Sewer Connection Permit (flows over 50,000 gallons per day) will be submitted for the Project.
Domestic Water and Fire Protection Existing Water Supply System The BWSC owns and maintains the water mains in the vicinity of the Project Site (Figure 5.1). BWSC record drawings show the streets surrounding the Site are serviced by southern low service pipes. These pipes range in size from a 12-inch main and a 48-inch main in Brookline Avenue, to 16-inch main on Boylston Street. The installation dates and materials of these pipes also vary, from pit-cast iron (“PCI”) pipe installed in 1905 and (“WS”) welded steel installed in 1935 to a PCI pipe installed in 1896. The pipes have been relined by BWSC between 1990 and 1995. The existing water infrastructure provides a high level of service and diversity to the Fenway neighborhood. Additionally, currently five fire hydrants are in close proximity to the Project Site. Proposed Water Supply Demand and Connection Domestic water demand is based on estimated sewage generation with an added factor of 10 percent for consumption, system losses, and other use. Based upon sewage generation rates outlined in the DEP Sewer Connection and Extension Regulations, 310 CMR 15.203.f, the Project will require between approximately 51,838 and 62,838 gallons of water per day. However, appropriate low-flow and low-consumption plumbing fixtures will be installed in all residential units to achieve a reduction in water usage of 30 to 40 percent over the baseline in order to comply with Article 37 of the Boston Zoning Code (as LEED “certifiable”), as discussed in Chapter 4, Environmental Protection. The Proponent will continue to consider and evaluate methods to conserve water as building design evolves. New water connections will be designed in accordance with BWSC design standards and requirements. Water services to new buildings will be metered in accordance with BWSC’s Site Plan Requirements and Site Review Process. The review includes, but is not limited to, sizing of domestic water and fire protection services, calculation of meter sizing, backflow prevention design, and location of hydrants and Siamese connections conform to BWSC and Boston Fire Department (BFD) requirements. The Proponent will provide for the connection of the meter to the BWSC’s automatic meter reading system. Fire protection connections on the Project Site will also need approval of the BFD. Utilities Natural Gas Service National Grid Energy owns and operates the gas mains and services in the vicinity of the Project Site (Figure 5.1). National Grid record plans indicate a 12-inch main in Brookline Avenue and 6-inch mains within \\MABOS\projects\11381.00\reports\Article80\ Expanded_PNF\05_InfrastructureSystems_FI NAL.doc 5-5 Infrastructure Systems
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