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• 1333 Martinez Street,San Leandro,California; Chang Income Property Partnership,LP(property owner)do Westlake Development Partners, LLC(applicant) DRAFT MITIGATION MONITORING PROGRAM (M1ViPI MONITORING IMPACT MITIGATION REQUIRED • RESPONSIBILITY TIMING Mitigation Measure#9(Continued) Hazards and Hazardous be followed: Materials(Continued) Conduct contingency monitoring by taking organic vapor City of San Leandro Prior to issuance of Grading readings using an organic vapor meter (OVM) or an organic Community Development Permit vapor analyzer (OVA) to screen for the presence of fuel, oil, or Department and solvents. If the OVM/OVA indicates that an unknown area of Environmental Services fuel,oil,or solvents has been detected, then a State environmental Division of the Public regulatory agency should be notified to determine if additional Works Department sampling is appropriate prior to continuing construction in that area. OVM or equivalent screening methods will be conducted by experienced personnel only. • If an unknown area of soil contamination has been identified, and the State environmental regulatory agency requests additional characterization,the following steps will be taken: o Soil samples will be collected from the identified area and • analyzed for the likely COPC,depending on the suspected type of contamination. The sampling strategy will be discussed with a State environmental regulatory agency prior to the initiation of the sampling activities. Analytical results collected from the suspected source will be compared to the health-based screening levels and results discussed with a State environmental regulatory agency. If the levels are below the relevant health-based screening levels and the State environmental regulatory agency concurs,no additional action may be necessary. o If the soil contains COPCs at levels that exceed the relevant health-based screening levels, or if the State regulatory agency concludes that an unacceptable risk to construction worker or • future residents may be present, then management measures, • such as the following,will be undertaken: • 0 Remove the impacted soil and dispose of oft Site; ❑ Install a cap to prevent contact with the contamination; ❑ Install a physical barrier for vapors such as a vapor barrier • or passive venting system, to prevent the accumulation of vapors in indoor environment; ' ❑ Stockpile soil and aerate on-Site, or in a staging area as may be appropriate, in compliance with all applicable laws and regulations; • 1333 Martinez Street,Westlake Office/Technology Campus—Draft MMP Page 8 •