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is ro <br /> s� <br /> &131ttPtEBU � l�C ti2;Pd <br /> ,C 17]!JaNS <br /> 723 <br /> 'rram,en:. <br /> 3U, 1991 <br /> January ...' � . <br /> Mr. Kyle Christie <br /> ARCO <br /> Products Company 7" <br /> 2000 Alameda da las Pulgas 017.3214-1511 <br /> Post Office Box 5811 <br /> San Mateo, California 94402 <br /> Subject: <br /> Report on October Quarterly Groundw <br /> ater Sampling at ARCO Station 434,501. <br /> Kettlettleman Lane, Lodi, Cal:farnia: Task Order#434-89-5A <br /> Dear Mr. Christie: <br /> groundwater sampling of 12 on- and off-site <br /> This letter report describes the October 1990 J; Station 434 in Lodi. A total of 14 on- <br /> monitoring wells at ARCO Products Company (ARCO) purpose of the <br /> and off-site groundwater monitoring wells are usually sampled on a quarterly basis. Wells W-4 <br /> characterize hydrocarbon occurrence in groundwater beneath the site <br /> and W-2A were not sampled during October due to lack of groundwater. e <br /> monitoring wells is to <br /> resulting from a December 1986 gasoline leak at Station 434• <br /> nzene concentrations in groundwater <br /> 1 shows the site location reap. Figure 2 Shows <br /> b <br /> the location <br /> Figure of monitoring wells and the <br /> direction of groundwater flow. Figure 3 shows <br /> samples collected during October 1990. <br /> product <br /> 2 and �� 3 apparent product thickness <br /> Between July and November 1198W and again be�eemaMx•num app ay and ly 1 88, free <br /> eriods was 3.18 feet of free product in monitoring well W-2• A <br /> accumulated in In �'e these two time periods• <br /> measured during these time p <br /> total of 52 gallons of gasoline were recovered from these wells during <br /> No product has been detected in monitoring well W-2 or W-3 since August 1998- <br /> monitoring <br /> To track the dissolved by <br /> drocarbon trends systematically, infalln 88tolueneOa authorized <br /> quarterly groundwater sampling and analysis for benzene, ethy <br /> monitoring wells W-IA,W-2,W-2133 W-3'W- <br /> (BE'C'K). Groundwater same <br /> les from and 5, 1990• <br /> W-8 W-9,W-10,W_11,and W-12 were collected for analysis on October 2,3, 4, <br /> Field Methods <br /> Dedicated pumpW-4 during <br /> s were installed in all of ton- off-site wells <br /> #P1201c manufactured by <br /> ---- ---- - - -- - ...._September 10, <br /> 12, and 13, 1990. The dedicatedP pumps are permanent y <br /> - -- <br /> QED, more commonly referred to-as-Well._Wtzards. Thededicated <br />