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r-; r r r r r r r I r . , r Executive Summary TABLE 2-1 (CONTINUED) SUMMARY OF IMPACTS AND MITIGATION MEASURES Environmental Impact Mitigation Measures Level of Significance (Level of Significance Prior to Mitigation) After Mitigation 2. The Native American Heritage Commission was unable to identify a descendant or the descendant failed to make a recommendation within 24 hours after being notified by the commission. Hazards And Hazardous Materials 4.11.1 There is the potential for existing and/or previously 4.11.1 If contaminated soil and/or groundwater are encountered or Less than Significant unidentified contamination to be encountered during suspected contamination is encountered during site clearing, project site preparation,construction activities,and construction activities,and mining activities,work shall be halted in mining activities.A leaking underground storage tank site the area of concern.The Applicant shall determine the type and (Fallon Tank Company)was identified in the database extent of the contamination by consulting with the appropriate search as being located near the intersection of South regulatory agencies(RWQCB, DTSC,and/or the San Joaquin or Costa Ranch Road(formerly Koster Road)and Blewett Stanislaus County Health Department)and implementing any Road.The exact location could not be determined.The necessary measures,such as soil and/or groundwater sampling and agencies who would oversee this type of case were analysis. If required by the regulatory agencies,a remediation plan contacted.There are no records on file for this site with shall be implemented either in conjunction with or prior to continued the Department of Toxic Substances Control,the project construction and/or mining activities. Regional Water Quality Control Board,or the San Joaquin County Environmental Health Department. Encountering contaminated soil,surface water,and groundwater without taking proper precautions could result in the exposure of construction workers and consequently result in associated significant adverse human health and environmental impacts.This would be a potentially significant impact.(PS) 4.11.2 During excavation,grading,and construction activities of 4.11.2 The project applicant shall ensure that all contractors and employees Less than Significant the proposed facilities,it is anticipated that limited immediately control the source of any leak and immediately contain quantities of miscellaneous hazardous substances,such any spill utilizing appropriate spill containment and countermeasures. as gasoline,diesel fuel,hydraulic fluid,solvents,oils,etc. If required by any regulatory agency,contaminated media shall be would be brought onto the site. In addition,the proposed collected and disposed of at an offsite facility approved to accept such project operations will include the use of fuels and other media. In addition,all precautions required by the RWQCB issued hazardous materials.As with any liquid and solid,during NPDES construction activity storm water permits would be taken to handling and transfer from one container to another,the ensure that no hazardous materials enter any nearby waterways. potential for an accidental release exists.Depending on the relative hazard of the material,if a spill were to occur of significant quantity,the accidental release could pose both a hazard to construction employees as well as the environment.This would be a potentially significant impact. (PS) Cemex Vernahs Quarry Mining and RedamabOn Project ES-23 ESA /23015 Final Environmental mpad Report June 2008