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. 7A <br /> •cx r <br /> x w� <br /> BROWN AND CALDWELL <br /> CONSULTING <br /> September 13, 1989 ; <br /> Mr. Kyle Christie <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94403 <br /> 017-3214-15/1 <br /> Subject: Report on July 1989 Quarterly Groundwater Sampling at <br /> ARCO Station 434, 501 Kettleman Lane, Lodi, California <br /> Dear Mr. Christie: <br /> This letter report describes the May and dune <br /> .? W-213 and the Jul groundwater sampling of on-site monitoring well <br /> July groundwater sampling of nine on- and off-site monitoring wells at ARCO <br /> Products Company (ARCO) Station 434 in Lodi. A total of ten on- and off-site groundwater <br /> .� monitoring wells were installed between April 1987 and June 1988. The pu eose of the <br /> Monitoring wells is to characterize hydrocarbon occurrence in groundwatrp <br /> resulting from a December 1986 gasoline leak at Station 434. r beneath the site <br /> Figure I shows the location of monitoring wells, <br /> E samples collected from these wells during July I989,bandethe directionaof groundwater flaw. <br /> i groundwater <br /> Figure 2 shows the design of each monitoring well and the installation dates, and the <br /> I i groundwater level beneath the site in April 1987, September 1988, and July 1989, <br /> Between Ju!y and November 1987, and again between May and July 1988, free product <br /> accumulated in monitoring.wells W-2 and W-3. The maximum product thickness measured <br /> during these :;me periods was 3.18 feet of free product in monitorin well <br /> f 52 gallons ��f of <br /> gasoline were recovered from these wells during these two time periodtotal <br /> lNo <br /> : > produce has been detected in monitoring well W-2 or W-3 since August 1988• <br /> To.track the dissolved hydrocarbon trends systematically, in fall 1988, ARCO authorized <br /> s quarterly groundwater sampling and analysis for benzene, ethylbenzene, toluene, and xylene <br /> (BETX)• At the request of the California Regional Witter Quality Control Board Central <br /> Valley Region, in May 1989 ARCO began monthly_ sampling and analysis._of_groundwater-- <br /> from.:the_.deeper_monitorin well <br /> —---- -- <br /> -- - -p--— g -2B) for-BETX:-Groundwater samples from monito!ing ----- <br /> f »� well W-213 were collectedfor far analysis on May 5 and June 6,:1989. Groundwater samples <br /> from monitoring wells W-I, W-2, W-2A, .W-2B, W-3, W-g, W-6, and W-7 were collected <br /> t analysis.on July 10, 11, and 12, 1989. Monitoring well W-8 was not sampled as dissolved <br /> hydrocarbons have never been identified in <br /> groundwater samples fron monitoring well W-8, <br /> and it is located some distance from any.identified.dissolved hydrocarbon occurrence. <br /> -a <br /> I <br /> i <br /> - § 723SSTREET SACRAMETgTD CALlFOR7V!q 9581<•7092•(91G1<I<•Gt23 <br /> q <br /> MEIER III <br />