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S <br /> "I' C 1 C R s o t' fi (:I, S , <br /> 1..-NSJrinaro,'13 Apr 1959 <br /> G <br /> The highest concentration of benzene was detected at 3,600 ppb in <br /> well MW-1 at the south side of the site. Well MW-1 alsu contained 1,300 <br /> Ppb toluene, 2,100 ppb total xylenes and Well <br /> -2 and MW-5, where benzene concene*rations were <br /> were detected in wells MW <br /> 750 ppb and 3.5 Ppb, respectively. 1n addition, 1.2-dichlorobenzene was <br /> T {_� detected at 10 ppb and Freon 113 was detected at 20 ppb in well MW-5. oil <br /> and grease we-e not detected in any of the wells. <br /> Groundwater samples from the wells were also anaiyzEd for cadmium, <br /> " chromium, lead and zinc. Only trace amounts of zinc were detected in well <br /> — MW-I, ,MW-2, MW-3, and MW-5. Laboratory reports are contained in <br /> Attachment F, <br /> WELL SURVEY AND GROUNDWATER FLOW <br /> ^'► All monitoring wells on the site were surveyed for to -of-c <br /> elevations by John loch, a licensed land surveyor (#LS4811) on 28 March <br /> 1989 to the City of Stockton benchmark #218. <br /> Figure 3 sho-,4s the po.entiometric su.rface of the shal <br /> taken en 22 March 1989. <br /> low-water- <br /> bearing zone based on depth-�to_water measurements <br /> The approximate direction of groundwater flow is <br /> gradient of about 17.. the to the east at a <br /> - A well canvas for a 1/2 61le radius around the site was <br /> performed <br /> for all registered wells. Department of Water Resources records and <br /> information obtained from the San Joaquin Local Health Districtindicae <br /> that three municipal wells and 21 monitoring wells are located within1/2 <br /> mile on Figure 4 and th(, wells are <br /> listed in Table 4. The Arco and Shell stations have I1 and 4 monitoring <br /> ile of the site. The wells are located <br /> wells, respectively. Two of the municipal wells <br /> f <br /> Swenson M,lnicipal Park golf course and one is located to theaeast at the <br /> intersection of Calhoun Way and Belmont <br /> from municipal Place, A water sample collected <br /> well 20L1 by B&C contained 1.3 ppb toluene, which was <br /> attributed to analytic error by B&C. <br /> r <br /> SUNWRY <br /> TPPH and BTXE in soil and water were detected only in borings and <br /> wells <br /> Of soion the southern half of the site and primarily in the first I6 ft <br /> l below the ground. surface. Wells MW-3 and MW-4 did clot contain <br /> detected concentrations Gr TPPH or BTXE in soil or water. The highssi <br /> concentration of TPPH at 390 <br /> ppm was detected ir?: soil collected from <br /> 1041ma9 <br /> %sa! <br />