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site. However, additional site characterization in the southeastern portion of the site <br /> needs to be completed and the data assessed to verify hydrocarbon concentration trends <br /> in the C-zone are declining before a format recommendation for MNA can be made. <br /> Once sufficient data has been collected to verify MNA is an appropriate remedial option, <br /> a revised corrective action plan will be submitted. <br /> Below is a work plan for the recommended additional assessment. <br /> 7.0 WORK PLAN <br /> As recommended in CRA's June 10,2011 Updated Site Conceptual Model,and based on <br /> the analysis presented above, additional delineation of groundwater quality in the <br /> C-zone is warranted. The groundwater samples collected from borings SB-7 through <br /> SB-10 indicate that elevated TPHg and benzene levels are present at depths ranging <br /> from approximately 56 to 64 fbg. The proposed wells should delineate the extent of <br /> TPHg and benzene in the C-zone and provide data to determine whether monitored <br /> natural attenuation is a suitable remedial alternative for this site. <br /> 7.1 PERMITS <br /> CRA will obtain drilling permits from the San Joaquin County Environmental Health <br /> Department. <br /> 7.2 HEALTH AND SAFETY PLAN HASP) <br /> CRA will prepare a HASP to protect site workers. The plan will be kept on site during <br /> field activities and will be reviewed and signed by each site worker. <br /> 7.3 UTILITY CLEARANCE <br /> CRA will mark the proposed drilling locations,and the locations will be cleared through <br /> Underground Service Alert and a private line locator service prior to drilling. <br /> 240854(29) 6 CON[STOGA-ROVERS&ASSOCIATES <br />