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Working To Restore Nature <br /> 3164 Gold Camp Drive <br /> Rancho Cordova,CA 95670 <br /> Phone: (916)852-6690 <br /> Fax: (916)852-6688 <br /> March 12, 1993 <br /> Mr. Chuck Carmel <br />. ARCO Products Company <br /> P.O. Box 5811 <br /> San Mateo, California 94402 <br /> Subject: Status Report, Fourth Quarter 1992, ARCO Service Station No. 0548, 1612 <br /> Hammer Lane, Stockton, California. <br /> 0 <br /> Mr. Carmel- <br /> . At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA) has <br /> prepared this status report on the third 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; Emcon subsequently forwarded their field <br /> notes and the laboratory reports to RESNA. Field work included measuring depths to water <br /> and collecting ground-water samples for subjective and laboratory analyses. RESNA used <br /> these data to evaluate the direction and gradient of ground-water flow beneath the site. The <br /> 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 analyses <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. Residual hydrocarbons were analytically identified in soil samples <br /> collected from borings near the tank cavity and dispenser islands. The wellhead elevations <br /> of the monitoring wells at the site were surveyed by Tom O. Morrow, Inc. (licensed land <br /> surveyors) of Sacramento, California). Dissolved gasoline hydrocarbons have been <br /> 0119ccar <br /> 30004-6 <br /> A <br />