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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 <br />Materials (Continued) <br />Mitigation Measure #23 (Continued) <br />o Oily, shiny, or chemical saturated soils; <br />Community Development and <br />Prior to Issuance of <br />o Soil with a significant chemical or hydrocarbon -like odor; or <br />Environmental Services <br />Grading Permit <br />O Significantly discolored soils. <br />Departments <br />Upon the discovery of one of the conditions identified above, the contractor <br />will conduct the contingency monitoring. Contingency monitoring, if <br />conducted, will consist of the following steps: If unknown areas of potential <br />discolored soils are encountered, additional analyses should be conducted for <br />the suspected constituents to assess the actual composition of the suspected <br />contamination. A State environmental regulatory agency should be contacted <br />for assistance in determining if additional sampling and potential mitigation is <br />necessary. If the encountered materials are suspected to contain volatile <br />organic chemicals, the following contingency monitoring procedures may be <br />followed: <br />Conduct contingency monitoring by taking organic vapor readings using an <br />organic vapor meter (OVM) or an organic vapor analyzer (OVA) to screen for <br />the presence of fuel, oil, or solvents. If the OVM/OVA indicates that an <br />unknown area of fuel, oil, or solvents has been detected, then a State <br />environmental regulatory agency should be notified to determine if additional <br />sampling is appropriate prior to continuing construction in that area. OVM or <br />equivalent screening methods will be conducted by experienced personnel <br />only. <br />If an unknown area of soil contamination has been identified, and the State <br />environmental regulatory agency requests additional characterization, the <br />following steps will be taken: <br />O Soil samples will be collected from the identified area and analyzed for <br />the likely COPC, depending on the suspected type of contamination. The <br />sampling strategy will be discussed with a State environmental regulatory <br />agency prior to the initiation of the sampling activities. Analytical results <br />collected from the suspected source will be compared to the health -based <br />screening levels and results discussed with a State environmental <br />regulatory agency. If the levels are below the relevant health -based <br />screening levels and the State environmental regulatory agency concurs, <br />10 <br />