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- § j 5 . �w.- Y` a rauY <br /> r i <br /> Mom: ae �v X3.,.1 Zu 1.� 'au` peeve <br /> i <br /> 1n� <br /> BROWN AND CALDWE!_L _ <br /> CONSjILVING ENGINEERS <br /> December 9, 1988LA <br /> 't <br /> Mr. Kyle Christie ti <br /> -� ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> a- San Mateo, California 94403 017-3214-15/1 <br /> i-� <br /> Subject: Report on September/October, 1988 Quarterly <br /> .a Groundwater Sampling at ARCO Station 434, <br /> 501 Kettleman Lane, Lodi, California <br /> .. Dear Mr. Christie: <br /> a-; <br /> This letter report describes the Se tember/October <br /> P groundwater sampling at ARCO Products <br /> Company (ARCO) Station 434 in Lodi. A total of ten on- and off-site groundwater <br /> t t! 1 monitoring wells were installed between April I987 and June 1988. The purpose of the <br /> monitoring wells is to characterize hydrocarbon occurrence in groundwater beneath the site <br /> f � resulting from a December 1986 gasoline leak at Station 434. An estimated 800 gallons of <br /> r'» <br /> ` unleaded gasoline were Iost as a result of the leak. <br /> gFigure 1 shows the location of monitoringwells,, benzene concentrations in groundwater <br /> 1 samples collected from these wells during September/October 1988, and the September 1988 <br /> direction ofg <br /> groundwater flow. Figure 2 shows the design of each monitoring well and the <br /> installation dates, and the groundwater IeveI beneath the site in April 1987 and in September <br /> i 1988. <br /> Between July 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 time periods was 3.18 feet of free product in monitoring well W-2. A torr.) of <br /> 52 gallons of gasoline were recovered from these wells during these two time periods. <br /> Ephemeral, minor (less than 0.3 feet) product has been measured on the groundwater surface <br /> s in monitoring well, W-2 since July I988. No product lias'been detected in monitoring well <br /> ` W-3 since July 1988. <br /> Y <br /> 64 - - - <br /> i - <br /> 1236STREET AMENTQ CALIFOANIA"4-7=-(916y 444.OM <br />