3B Public Hearing 2009 0720 - Laserfiche WebLink

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PLN2009-00030; Cornerstone at San Leandro Crossings Marcli 20, 2009 Mitigated Negative Declaration warranted, the following mitigation measures listed below include 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 would be required to meet applicable federal, state and local laws, regulations and requirements. Mitigation Measure #23 Risk Management Measures for Construction Phases The following are risk management procedures to be followed by future contractors during Site preparation and construction activities. General soil management protocols are presented; as well as, protocols for managing fill soils that may be brought to the Sites during filling operations. Pre -Construction Planning and Notification: Prior to the start of construction activities involving below -ground work, information regarding known areas of contamination shall be provided to the contractor by the Site owner. • Site -Specific Health and Safety Worker Requirements: Each contractor will be responsible for the health and safety of their own workers, including, but not limited to, preparation of their own health and safety plan (HSP) and injury and illness prevention plan (IIPP). The purpose of these documents is to provide general guidance to the work hazards that may be encountered during each phase of construction activities. Contractors are also required to determine the requirements for worker training, based on the level of expected contact to soil, soil vapor, and groundwater associated '3