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i <br /> r. Working To Restore Nature <br />' <br /> ELI <br /> 3164 Gold Camp Drive uM Y <br /> Rancho Cordova, CA 95670 JAN 1 9 1993 <br /> Phone (916)852-6690 <br /> Fax (916) 852-6688 ENVIRONMENTAL HEALTH <br /> PERMIT/6€RVIM <br /> January 11, 1993 <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> P O Box 5811 <br /> San Mateo, California 94402 <br /> Subject- Status Report and Ground-Water Monitoring, Third Quarter 1992, for ARCO <br /> Service Station No 2130, 7906 North El Dorado Street, Stockton, California <br /> Mr Christie. <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 for the <br /> subject site (shown on Plate 1) Work included measuring depths to water and collecting <br /> ground,water samples for subjective analyses on a monthly basis and collecting ground-water <br /> samples for laboratory analyses on a quarterly basis This work was conducted to monitor <br /> the concentrations of dissolved hydrocarbons in ground water and to evaluate the direction <br /> and gradient of ground-water flow beneath the site The locations of the monitoring wells <br /> 1 are shown on Plate 2 <br /> BACKGROUND <br /> Work performed to date includes drilling eight soil borings and installing four vapor- <br /> extraction wells and three ground-water monitoring wells at the site (RESNA, February 14, <br /> 1992, Report No 30003-4) Residual hydrocarbons were detected in soil to 60 feet below <br /> grade at the ground-water interface near the existing tanks, and dissolved hydrocarbons were <br /> detected at concf ntrations bow„ ve maximum co_ntamin_a_nt levels.(MCL')in water sampled <br /> from the threey6nsi#e ground-water monitoring wells <br /> 1 <br /> r� 1031kchr <br /> 30003-6 <br />