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3164 Gold Camp Drive <br /> Delta Suite ; <br /> 1////Ak <br /> Ranchoo Cordova,CA 95670-6021 <br /> Environmental U.S.A. <br /> Consultants,Inc. 916/638-2085!: <br /> November 30, 2000 FAX:916/638-8385 <br /> p <br /> Ms. Lori Duncan <br /> Sari Joaquin County, Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Ave., Third Floor <br /> Stockton, California 95202 �d <br /> Re-' ARCO Facility No. 6080 1} <br /> k <br /> i1 85 Louise Avenue <br /> Lathrop, California- - .�-- <br /> Delta Project No, D000-339-2 <br /> Dear Ms. Duncan: <br /> �i <br /> I <br /> As 1� discussed during our telephone conversation today, one additional round of <br /> groundwater sampling will be performed and the results evaluated before any additional , <br /> assessment activities are proposed. To date, two groundwater sampling events have been <br /> conducted: 'The`initial event indicated a groundwater flow direction toward the northeast <br /> with a gradient of 0.0026 ft/ft. The most recent sampling event showed groundwater <br /> beneath the site to be flat. <br /> '3 <br /> Given the uncertainty of the groundwater flow direction and the low concentrations of <br /> residual and dissolved hydrocarbons beneath the site, additional information pertaining to <br /> the":groundwater is warranted in order to prepare an appropriate scope of work for <br /> conducting any further site investigations. Therefore, per our conversation, the due date <br /> for submitting a work plan for additional assessment by December 8, 2000 (PHS/EHD <br /> letter dated November 7, 2000) has been postponed until additional information 'tan be <br /> obtained and evaluated. Once the fourth quarter groundwater sampling event_has been <br /> performed and the quarterly report submitted, we would like to discuss the site conditions <br /> and establish an appropriate schedule for the next course of action. <br /> If you have any questions regarding this project, please contact me at (530) 676-6000. <br /> Sincerely, <br /> DEL ENVIR ENTAL CONSULTANTS,INC. <br /> J ohn , R.G. <br /> cc: Paul Supple, Atlantic Richfield Company !, <br /> C:1ARC0160801Correspondcncc\Duncan 113000.doc <br /> Providing a Competitive Edge <br />