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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 (MMP) MONITORING • IMPACT MITIGATION REQUIRED RESPONSIBILITY TIMING Mitigation Measure#7(Continued) • Hazards and Hazardous . If the subsurface investigation programs yield data suggesting Materials(Continued) that there could be unacceptable risks to future construction workers or residents,•a California state environmental regulatory • agency will be consulted to provide its opinion on the findings of the subsurface investigations and the assessment of risk. This opinion would be sought prior to initiating construction.. #S: (Pre Development Mitigation Measures) City of San Leandro Prior CO issuance of Grading If the subsurface investigation programs yield data suggesting Community Development Permit • that there could be unacceptable risks to future construction Department and workers or residents and a California state environmental Environmental Services regulatory agency determines that an active remedial response is Division of the Public warranted, the following mitigation measures listed below include Works Department methods that may be employed to mitigate unacceptable risks to human health of construction works and future residents. • • Remove the impacted soil and dispose of off-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; • Conduct in situ bioremediation measures;or • • Implement liquid or vapor extraction measures. The appropriateness of one of the above management measures over another will depend on many factors, such as the type of constituent detected, the size of the identified impacted area, and • the estimated cost of implementing the remedy. Results of the sampling activities and the proposed course of action, e.g., no action necessary, soil excavation and off-site disposal, on-site treatment and soil reuse, shall be reported to a State environmental regulatory agency and the contractor shall obtain concurrence before implementing the remedial measures. Remedial action plans would be approved in advance by a state environmental regulatory agency. Any cleanup or remediation • 1333 Martinez'Street, Westlake Office/Technology Campus—Draft MMP Page 3 •