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i <br /> AM� <br /> Working To Restore Nature <br /> 1 3164 Gold Camp Drive <br /> Rancho Cordova, CA 95670 <br /> Phone (916)852-6690 <br /> Fax (916) 852-6688 <br /> i <br /> 1 <br /> March 12, 1993 <br /> Mr. Chuck Carmel <br /> 1 ARCO Products Company <br /> 1 P.O Box 5811 <br /> San Mateo, California 94402 <br /> Subject Status Report, Fourth Quarter 1992, for ARCO Service Station No 2130, <br /> 1 7906 North El Dorado Street, Stockton, California <br /> r <br /> Mr Carmel <br /> At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA) has <br /> prepared this status report on work conducted during the fourth quarter 1992 at the subject <br /> site (shown on Plate 1) Work included drilling and constructing two offsite monitoring,/ <br /> wells, measuring depths to water and collecting ground-water samples for subjective analyses <br /> on a monthly basis, and collecting ground-water samples for laboratory analyses on a <br /> quarterly basis. This work was conducted to evaluate hydrocarbons in soil, monitor the <br /> concentrations of dissolved hydrocarbons in ground water and to evaluate the direction and <br /> 1 gradient of groundwater flow beneath the site The locations of the monitoring wells are <br /> shown on Plate 2 <br /> BACKGROUND <br /> r soil.Xorings and installing ten/' <br /> performed prior to this quarter included drilling twenty <br /> vapor-extraction wells, five groundZi+ater monitoring wells, one airs(parge well, and three <br /> sparge,fnonitoring points in the borings at the site Residual hydrocarbons were detected <br /> in soil to 60 feet below grade at the ground-water interface near the existing tanks, and <br /> dissolved hydrocarbons were detected at concentrations above maximum contaminant levels <br /> (MCL's) in water sampled from the three onsite ground-water monitoring wells <br /> t <br /> 1105kchr <br /> 30003-b <br />