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A RESNA Company ®® <br /> Environmental Solutions` <br /> Through Applied Science, <br /> .103164 Gold Camp Drive, Suite 200 Engineering&Construction <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916) 852-6688 <br />• June 16, 1992 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br />• P.O. Box 5811 <br /> San Mateo, California 94402 <br /> Subject: Status Report and Ground-Water Monitoring, First Quarter 1992, ARCO <br /> Service Station No. 0548, 1612 Hammer Lane, Stockton, California. <br /> Mr. Carmel: <br /> At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA) has <br /> prepared this status report on the first quarter 1992 ground-water monitoring event at the <br /> subject site (see Plate 1). Emcon Associates (Emcon) of Sacramento, California, was <br />• contracted by ARCO to conduct the field work at the site: Emcon subsequently forwarded <br /> their field notes and the laboratory reports to RESNA. Field work included measuring <br /> depths to water and collecting groundwater samples for subjective and laboratory analyses. <br /> RESNA used these data to evaluate the direction and gradient of ground-water flow <br /> beneath the site. The locations of the monitoring wells are shown on Plate 2. <br />• <br /> BACKGROUND <br /> RESNA (formerly Applied GeoSystems) conducted a Preliminary Tank Replacement, <br /> Assessment investigation in Octob_er 1990 jto evaluate soil for the presence of hydrocarbons <br /> (Applied GeoSystems, Inc., December 18, 1990, Report No. 30004-2). During this <br /> investigation Ave soil borings(B-1 through B-5) were drilled at the site. Results of analyses <br /> ;indicated residual hydrocarbons''were present in soil near the tank cavity. <br /> - - <br /> InlOctober 1.991, RESNA conducted an investigation that included drilling nine soil borings <br />• and constructing four groundwater iYionitaring well's (MW-1 through MW-4)and three <br /> ,vapor-extraction wells and analyzing:soil—and ground-water samples for hydrocarbons. <br /> Residual hydrocarbons were analytipal ly,_-identified7in soil samples collected from borings <br /> near the tank cavity and dispenser islands. The gr6und=water'surface beneath the site at the <br /> time of measurement was approximately 49 feet below grade,. The wellhead elevations of <br /> the monitoring wells at the site were surveyed by Tom 0. Morrow, Inc. (licensed land <br /> surveyors) of Sacramento, California. The,ground-water fl6w7direction was south of 6k7 <br /> aa21ccar <br /> 3OW4-6 <br /> • <br />