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Working 7o Restore Nature <br /> 3164 Gold Camp Drive <br /> Rancho Cordova, CA 95670 <br /> Phone:(916)852-6690 <br /> Fax: (916) 852-6688 <br /> August 18, 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, Second 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 second 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 ground-water 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 /> BACKGROUND <br /> RESNA (formerly Applied GeoSystems) conducted a Preliminary Tank Replacement <br /> Assessment investigation in October 1990 to evaluate soil for the presence of hydrocarbons <br /> (Applied GeoSystems, Inc., December 18, 1990, Report No. 30004-2). During this <br /> investigation, five soil borings (B-1 through B-5) were drilled at the site.: Results of anaiyses <br /> indicated residual hydrocarbons,were present"in soil near the tank cavity. <br /> In October 1991, RESNA conducted an investigation that included drilling nine soil borings <br /> and constructing four ground-water monitoring wells (MW-1 through MW-4) and three <br /> vapor-extraction wells and analyzing soil and ground-water samples for hydrocarbons. <br /> Residual hydrocarbons were analytically identified in soil samples collected from borings <br /> near the tank cavity and dispenser islands. The wellhead elevations of the monitoring wells <br /> at the site were surveyed by Tom O. Morrow, Inc. (licensed land surveyors) of Sacramento, <br /> o708ccar <br /> 30004-6 <br />