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The site of a former Knowles service station is approximately 200 <br /> yards west--southwest of Exxon RS 7-1050 on the southwest corner <br /> of the intersection of Hammer Lane and, Pacific Avenue. Under- <br /> ground tanks were once used to store gasoline at this station. <br /> The station building and underground storage tanks were removed <br /> ' from the site in Petrwriry 1990. ? J7 70 2- <br /> T <br /> 1 .2 SITE SUMMARY OF GEOLOGY AND HYDROGEOLOGY <br /> E <br /> 3 <br /> The soil and groundwater in the subsurface at former Exxon <br /> RS 7-.1050 have been investigated for the presence of petroleum <br /> contamination since 1986. The soil section has been described, <br /> d. using undisturbed samples collected during the drilling of <br /> j borings. Samples of the soil, soil vapor, and groundwater have <br /> been analyzed for petroleum contamination. <br /> Five monitoring wells were installed at the site between November <br /> 1.986 and June 1987. The depth to groundwater at that time was <br /> s ? between 47 and 50 feet. <br /> The water level in the wells has dropped since the wells were � <br /> y installed (Table 1 ), and MW3, MW4, and MW5 were dry during the , <br /> ,=. ,ummer and fall of 1989. On 28 June 1990, the static depth to , <br /> water in the various wells was between -57.76 and, 58.35 feet.. MW4 <br /> and i�'1 5_were dry. f <br /> ( <br /> Figure 3 is a geologic cross--section of the subsurface drawn from <br /> I the well logs. The site is on interbedded sands, silts, and <br /> � Clays, <br /> formations that consist of both laterally <br /> E <br /> -heterogeneousY <br /> and. vertically discontinuous fluvial deposits. The principal <br /> aquifer, materials are sand lenses containing some silt and clay <br /> and clay lenses %!ith sand and silt. The aquifer is unconfined, <br /> and no confining layers have been voted in the drilling logs. <br /> , 9 <br /> :tee <br /> e42/71050/7-90/tx . 2 <br /> i � t <br />