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r Working To Restore Nature <br /> 3164 Gold Camp Drive,Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Phone: (916) 852-6690 <br /> FAX: (916)852-6688 <br />� I <br /> September 13, 1993 <br /> Mr. Chuck Carmel <br /> 0 ARCO Products Company <br /> P.Q. Box 5811 <br /> San Mateo, California 94402 <br /> Subject: Status Report, Second Quarter 1993, ARCO Service Station No. 0548, 1612 <br />. 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 1993 groundwater monitoring event at the <br /> 010 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 groundwater samples for subjective and laboratory analyses. RESNA used <br /> these data to evaluate the direction and gradient of groundwater flow beneath the site. The <br /> 0 locations of the monitoring wells are shown on Plate 2. <br /> BACKGROUND <br /> Work performed prior to this quarter included drilling fourteen soil borings and installing <br /> 0 four groundwater monitoring wells and three vapor-extraction wells. Residual hydrocarbons <br /> were analytically identified in soil samples collected from borings near the tank cavity. <br /> Minor concentrations of hydrocarbons were detected in soil samples collected from soil <br /> boring near the dispenser islands. Dissolved gasoline hydrocarbons have been analytically <br /> identified in groundwater samples collected from monitoring well MW-1. Dissolved gasoline <br />• hydrocarbons were not detected in groundwater samples collected from the remaining wells. <br /> On April 8 and 9, 1993, RESNA observed drilling of five soil borings (B-15 through B-19) <br /> and construction of one groundwater monitoring well (W-5) at the site. Results of analyses <br /> indicated gasoline hydrocarbons were not detected in the sample collected from the borings, <br /> with the exception of one sample collected from 41.5 feet below grade in borings B-15. <br /> 0629cear <br /> l�! 30004-5 <br />