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4.11 Hazards and Hazardous Materials <br /> I. <br /> unknown) were observed on the site, an agricultural chemical storage trailer, and various <br /> substances(motor oil, hydraulic fluid)are stored in the barn on the site. <br /> Mitigation Measure <br /> Measure 4.11.1: If contaminated soil and/or groundwater are encountered or suspected <br /> contamination is encountered during site clearing, construction activities, and mining <br /> activities, work shall be halted in the area of concern. The Applicant shall determine the <br /> type and extent of the contamination by consulting with the appropriate regulatory agencies <br /> (RWQCB, DTSC, and/or the San Joaquin County Environmental Health or Stanislaus <br /> 6. County Health Department)and implementing any necessary measures, such as soil and/or <br /> groundwater sampling and analysis. If required by the regulatory agencies, a remediation <br /> plan shall be implemented, either in conjunction with or prior to continued project <br /> ` construction and/or mining activities. <br /> Impact Significance After Mitigation: Less than significant. <br /> Impact 4.11.2: During excavation,grading,and construction activities of the proposed <br /> facilities,it is anticipated that limited quantities of miscellaneous hazardous substances, <br /> such as gasoline,diesel fuel,hydraulic fluid,solvents,oils,etc. would be brought onto the <br /> site. In addition,the proposed project operations will include the use of fuels and other <br /> hazardous materials. As with any liquid and solid,during handling and transfer from one <br /> container to another,the potential for an accidental release exists. Depending on the <br /> relative hazard of the material,if a spill were to occur of significant quantity,the accidental <br /> release could pose both a hazard to construction employees as well as the environment. <br /> (Potentially significant) <br /> Mitigation Measure <br /> Measure 4.11.2: The project applicant shall ensure that all contractors and employees <br /> immediately control the source of any leak and immediately contain any spill utilizing <br /> appropriate spill containment and countermeasures. If required by any regulatory agency, <br /> v contaminated media shall be collected and disposed of at an off-site facility approved to <br /> accept such media. In addition, all precautions required by the RWQCB issued NPDES <br /> construction activity storm water permits would be taken to ensure that no hazardous <br /> � materials enter any nearby waterways. <br /> Significance after Mitigation: Less than significant. <br /> Impact 4.11.3: The project would involve the installation and use of above-ground fuel <br /> storage tanks,and the storage and use of both solid waste and hazardous materials. (Less <br /> than significant) <br /> RMC Pacific Vernalis Quarry Mining and Redamation Project .11- ESA/203015 <br /> Draft Environmental Impact Report May 2006 <br />