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Ag <br /> plied /nc. <br /> A RESNA Company <br /> Environmental Solutions <br /> Through Applied Science, <br /> 03164 G61d Camp Drive, Suite 200 Engineering&Construction <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916) 852-6688 ' <br /> PRELIMINARY INVESTIGATION <br /> AND EVALUATION REPORT <br /> for <br /> ARCO Service Station No. 548 <br /> 1612 Hammer Lane <br /> Stockton, California <br /> 7 For ARCO Products Company <br /> INTRODUCTION <br /> At the request of ARCO Products Company(ARCO),RESNA Industries(RESNA,formally <br /> Applied GeoSystems) conducted a subsurface investigation at ARCO Service Station No. <br /> 548, 1612 Hammer Lane in Stockton, California, in response to the detection of <br /> • hydrocarbons in soil during a Preliminary Tank Replacement Assessment investigation in <br /> October 1990. The purpose of this investigation was to evaluate the extent of hydrocarbons <br /> previously identified in the soil and assess possible hydrocarbons present in the ground <br /> water. <br /> The work performed for this investigation included drilling nine soil borings, installing <br /> ground-water monitoring wells in four of the borings, developing and purging the wells, <br /> installing three vapor-extraction wells in three of the borings, and collecting and analyzing <br /> soil and ground-water samples for hydrocarbon constituents_ Data gathered during the <br /> investigation were used to evaluate the extent of residual hydrocarbons in soil, assess <br /> whether ground water underlying the site has been affected by hydrocarbons, and evaluate <br /> the groundwater flow direction and gradient. This report summarizes previous <br /> environmental investigations conducted at the site, describes the tasks performed during this <br /> investigation, includes the laboratory results, and presents our interpretations and <br /> conclusions. <br /> 3OW4-4 <br />