AgdaPkt 2018-01-22 Joint SA PFA - Laserfiche WebLink

Browse Search

!1CIVIL ENGINEERS 18.C. - Page 30 y/ I S SULARVNNERSEYORS P Site Assessment Studv January 12, 2018 Harbor View — Inner Harbor would have a portion of the site flowing to the Oddstad watershed while the other areas will be retained and/or runoff into the Seaport Boulevard Watershed. Existing pumps at the Oddstadt pump station have a capacity of 92 cfs, which is located on the Southwest corner of the project site. Though, this pump station also accounts for areas south of Highway 101 as well as west of the project site across Maple Street, whose flows were not calculated for the purposes of this study. Removal and replacement of an existing SD line will be required due to the footprint of Parking Structure A on the west side of the property. Removing and re-routing this 33" storm drain pipe will have an approximate cost of $ 97,803 to the developer. Assuming the Base Project is designed around the existing lines and no re-routing is necessary, there is a possibility there will be no additional cost to the developer. In either scenario there will be no additional cost to the city. POTABLE WATER Potable water is supplied to the project site from the City's Main Pressure Zone, which is supplied by several turnout connections to the San Francisco Public Utility Commission's (SFPUC's) Regional Water System. For design purposes, an assumed ratio of one to one sewer load to water demand is used to calculate peak hourly demand. This results in a peak flow rate of 426.39 gpm and 309.70 gpm for the Proposed and Base Project, respectively. Available capacity within the transmission mains for the proposed project site is 6,000 gpm, which meets the required peak flow rate for fire flow as well as additional capacity for the building (EIR, Inner Harbor Specific Plan Utilities Engineering Report, 2015). Therefore, there are no additional costs to the developer for upsizing or relocation of existing potable water utilities for the Proposed or Base Project. In either scenario there will be no additional cost to the city. RECYCLED WATER Recycled water is supplied to the project site from the Silicon Valley Clean Water (SVCW) treatment plant in Redwood Shores. An existing 24" Recycled Water line runs along Blomquist Street to Maple Street. There is minimal existing recycled water use within the surrounding region, and available capacity to service the project site (EIR, Inner Harbor Specific Plan Utilities Engineering Report, 2015). This assumes a future booster pump station and regional tank to account for peak flows. This is presented within the Inner Harbor Specific Plan Utilities Engineering Report as necessary to service the entire region during peak flows, and is independent of the proposed project site development. Therefore, there are no additional costs to the developer for improvements or replacement of existing recycled water utilities around the site for the Proposed or Base Project. In either scenario there will be no additional cost to the city. See Appendix C for existing utilities layout. Page 14 1700 S. Winchester Boulevard I Campbell, CA 95008 1 P. 408.636.0900 1 F. 408.636.0999 / www.sandis.net