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SECOR <br /> �} Internataonallncorporated <br /> •� W <br /> _]d �_r <br /> January 15, 2002 JAN 2 2 Z09Z <br /> Project 077 42030 010 <br /> ENVIRONMENT HEALTH <br /> Ms Lori Duncan PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re Response to SJCPHS Letter dated December 7, 2001 and <br /> Work PIan for Additional Site Assessment and Feasibility Testing <br /> ARCO Station#4932 <br /> 16 East Harding Way <br /> Stockton, California <br /> Dear Ms Duncan <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Atlantis Richfield Company, provides responses to the comments made by the San <br /> Joaquin County Public Health Services (SJCPHS) in their letter dated December 7, 2001 <br /> . (Attachment A) and presents a work plan for additional site assessment, feasibility <br /> testing, and interim remediation activities The subject letter includes a summary review <br /> of the Interim Remediation/Multi-Phase Extraction Feasibility Test Report dated May 4, <br /> 2001 and Additional Site Assessment Report dated November 9, 2001 submitted by <br /> SECOR The proposed additional site assessment activities, feasibility testing, and <br /> interim remediation includes the installation of three shallow groundwater monitoring <br /> well, three deep groundwater monitoring wells, one groundwater extraction well, <br /> performance of an aquifer test, and the performance of batch groundwater extraction at <br /> the subject site (Figures 1 and 2) The objective of site assessment activities is to define <br /> the lateral and vertical extent of the petroleum hydrocarbon plume in shallow and deep <br /> groundwater at the site <br /> This work plan includes a brief discussion of site background, proposed scope of work, <br /> and schedule The SCEMD's comments are listed below in bold italics and responses <br /> follow each comment <br /> I The Feasibility Test Report documenting a multi phase extraction (MPE)pilot test <br /> that took place the week of February 12-16, 2001. Please note that the report was <br /> submatted to PHS/EHD four weeks late. <br /> In SECOR's Workplan for Multi-Phase Extraction feasibility no formal deadline was <br /> j proposed, instead it was stated the report will be submitted in approximately-6--8-weeks, <br /> after testing, however in this case the report was submitted approximately 11 weeks after <br /> completion In future work plans SECOR will propose deadline for the submittal of the <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax www secor com <br />