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CORNERSTONE AT SAN LEANDRO CROSSINGS <br />DRAFT MITIGATION MONITORING AND REPORTING PLAN <br />IMPACT <br />MITIGATION MEASURES REQUIRED <br />MONITORING <br />RESPONSIBILITY <br />TIMING <br />Hazards & Hazardous Materials (Continued) <br />Mitigation Measure #23 (Continued) <br />migration of contaminated groundwater. These measures shall be identified in <br />Community Development and <br />Prior to Issuance of <br />the site-specific geotechnical investigation reports. Appropriate measures shall <br />Environmental Services <br />Grading Permit <br />be implemented to reduce vapor migration through trench backfill and utility <br />Departments <br />conduits. Such measures may include placement of low -permeability backfill <br />"plugs" at intervals on-site and where utilities extend off current parcel <br />boundaries. <br />Storm Water Pollution Controls: A storm water pollution prevention plan <br />(SWPPP) will be required to be prepared for the site_ Storm water pollution <br />controls shall be based on best management practices (BMPs), such as those <br />described in "Guidelines for Construction Projects" and "Erosion and <br />Sediment Control Field Manual" published by the San Francisco Regional <br />Water Quality Control Board. <br />Excavation De -Watering: Although not anticipated, if excavation de- <br />watering is required, the water will be sampled and analyzed prior to pumping <br />to evaluate discharge alternatives. The developer's environmental consultant <br />shall collect a sample of the water for laboratory analyses for COPCs, other <br />analyses may be required, based on the intended use of the water_ <br />Additional Soil Management Protocols During Construction Activities: <br />Soil with residual COPCs may be present on-site.. Subsurface investigations <br />planned for the Sites will determine the presence or absence of COPCs in soils. <br />Once soils are tested, a Site specific soil management plan (SMP) will be <br />prepared. At the present time, there are no known chemical source areas or <br />areas of soil contamination on either Site. The protocols to be followed in the <br />event that unknown areas of contamination are identified during development <br />are described in this section. <br />Procedures for Discovery of Unknown Areas of Contamination: Site <br />development activities may result in the identification of previously unknown <br />areas or types of contamination. Unknown conditions which may trigger <br />contingency monitoring procedures during site development include, but are <br />not limited to, the following: <br />