5A Public Hearings 2018 0507 - Laserfiche WebLink

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City of San Leandro Alvarado Commerce Center Project 58 weather, using sediment controls or filtration to remove sediment when dewatering, protecting all storm drain inlets in the vicinity of the project site from sediment, diverting onsite runoff around the site, and using sediment barriers. Operational Impacts Increasing the total area of impervious surfaces can result in a greater potential to introduce pollutants to receiving waters. Urban runoff can carry a variety of pollutants, including oil and grease, metals, sediment, and pesticide residues from roadways, parking lots, rooftops, and landscaped areas depositing them into adjacent waterways via the storm drain system (San Leandro 2016f). However, stormwater discharge during operation is regulated by the Municipal Separate Storm Sewer System (MS4) Permit, issued by the RWQCB, pursuant to NPDES regulations. Water quality in stormwater runoff is regulated locally by the Alameda County Clean Water Program, which includes the C.3 provisions set by the San Francisco Bay RWQCB. Provision C.3 of the MRP addresses post- construction stormwater requirements for new development and redevelopment projects that add and/or replace 10,000 square feet or more of impervious area. Because the project would replace in excess of 10,000 square feet of the impervious surface of the project site, it must comply with the C.3 provisions set by the RWQCB. Therefore, the project must meet certain criteria including: 1) incorporate site design, source control, and stormwater treatment measures into the project design; 2) minimize the discharge of pollutants in stormwater runoff and non-stormwater discharge; and 3) minimize increases in runoff flows as compared to pre-development conditions. A Stormwater Control Plan (SCP) that details the site control, source control, and stormwater measures that would be implemented at the site must be submitted to the City. In addition, Low Impact Development (LID) requirements apply. The Alameda County Clean Water Program’s C.3 Technical Guidance document (2016) provides guidance on how to meet the C.3 requirements. In accordance with the C.3 requirements, as discussed under questions (d) and (e) below, the project would reduce the amount of impervious surfaces on the site. The project would also direct runoff from roofs and sidewalks into vegetated areas and include landscaped bioswale areas to treat runoff before entering the stormwater system. By adhering to the provisions of NPDES Section C.3, the SWPPP, and the stormwater control plan, the project would not result in adverse effects on water quality and or in the violation of water quality standards or waste discharge requirements during construction or operation. Therefore, the project would have a less than significant impact on water quality. With implementation of the measures contained in these plans, excessive stormwater runoff, erosion, and sedimentation would not occur and the potential for the project to violate water quality standards and substantially degrade water quality would be reduced. Impacts would be less than significant. LESS THAN SIGNIFICANT IMPACT b. Would the project substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering or the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level that would not support existing land uses or planned uses for which permits have been granted)? As discussed in Section 18, Utilities and Service Systems, the project would receive its water from the East Bay Municipal Utility District (EBMUD). Based on historical averages, about 90 percent of 355