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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 `'Fo <br /> 209/468-3420 <br /> Cross Roads CREA Investors LLC Copy <br /> C/O David Henry <br /> Management Consultants, Inc. APR 2 7 1998 <br /> 1528 Villa Tulipan <br /> San Clemente CA 92673 <br /> Re: D'Arcy Road Extension Project <br /> 400-500 Block of D'Arcy Road <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the April 22,1998 "Summary Report for Subsurface <br /> Investigation, Interim Remediation, and Corrective Action Plan" prepared by <br /> ATC Associates Inc. for the above referenced site. <br /> In the Corrective Action Plan (CAP) ATC describes the result of the subsurface <br /> investigation and proposes two alternative methods of cleanup. The extent of soil <br /> contamination appears to be confined laterally to the area of the pit and vertically <br /> to a depth of 17 feet. The lateral extent of the groundwater plume has been <br /> defined by the soil borings advanced on April 3, 1998. <br /> The proposed scope of work entails field monitoring during construction <br /> activities, excavating impacted soil and stockpiling soil on site, extracting <br /> impacted groundwater into a temporary storage tank, disposing of impacted soil <br /> and or groundwater off site, collecting confirmation samples and providing a <br /> letter report containing a summary and results. Upon completion of all <br /> remediation activities a report requesting closure of the site will be prepared for <br /> submittal to PHS/EHD and the Regional Water Quality Control Board. <br /> PHS/EHD requires that the abatement be in accordance with State Water <br /> Resources Control Board resolution 92-49 which requires the cleanup of all <br /> discharged wastes to background conditions utilizing the most cost effective <br /> method of cleanup. Quarterly monitoring well data will be required to confirm <br /> achievement of cleanup objectives. PHS/EHD requires EPA method 8260 <br /> analysis of groundwater confirmation samples for fuel oxygenates in addition to <br /> the analyses proposed in the CAP. <br /> A Division of San Joaquin Counry Health Care Services <br />