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City of San Leandro CIA No. D43CIASAL0001 Attachment II, Page 1 of 9 ATTACHMENT II SCOPE SUMMARY City of San Leandro Storm Water Trash Capture Project at Site 14.1 & 14.2 Introduction The two proposed trash capture devices (TCD) will cover drainage from Caltrans right of way near the Marina / I 880) interchange crossing. • The TCD at Site 14.1 will capture runoff from 338.5 acres from the City of San Leandro and 5.5 acres from Caltrans, of which 5.5 acres is Significant Trash Generating Area (STGA). The project is located off Nimitz Fwy south of Fairway Drive (see Figure 1). • The Site 14.2 TCD will capture runoff from 227 acres from the City of San Leandro and 23 acres from Caltrans, of which 23 acres is Significant Trash Generating Area (STGA). The project is located near the intersection of Wicks Blvd and Merced St. (see Figure 3). Background The City of San Leandro is located in Alameda County and as such is subject to the requirements contained in the third five-year term of the Municipal Regional Permit (MRP) issued by the San Francisco Bay Regional Water Board. Alameda County permittees are required to reduce trash discharges to the Bay from municipal storm drain systems. This requirement began with the issuance of the first MRP in 2009, with a 40% reduction required in 2014. Under the current MRP term, no adverse impact on receiving waters from trash is required by 2025. These reductions will largely be accomplished through the implementation of large and small inlet based full trash capture devices within the City of San Leandro. Site 14.1 Proposed Project Site 14.1 is located at the outlet of an Alameda County Flood Control District (ACFCD) canal to the west of Nimitz Fwy south of Fairway Drive. The project site is owned by the ACFCD as it is proposed to be installed on an ACFCD canal. The project will include the installation of Gross Solid Removal Device (GSRD) screens in the ACFCD channel, a short distance downstream from the outfall of a 66” storm drain. The concrete channel is proposed to be widened from a bottom width of 5 feet to 20 feet to accommodate five 24” diameter screens with 12 inches of spacing between each screen. In total, there will be 100 feet of screen in five, 20-foot sections to effectively capture the treatment flow rate of 87 cfs. A weir will be installed across the channel to attach the screens and allow for bypass of flows greater than the treatment event (1-year, 1-hour) over the weir. All dry-weather urban runoff and the first flows of wet-weather runoff will be conveyed to the screens at Site 14.1. Caltrans right-of-way