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I <br /> sampler. Samples were collected, <br /> under chain-of-custod Preserved and transported protocol. Y in accordance with standard EPA <br /> WaterWork's Soil <br /> ific sampling procedures are outlined in <br /> ( from the bottom of each boring <br /> (Appendix II), Samples <br /> I : toluene, ethyl b� g were analyzed for benzene, <br /> toluene, <br /> euri by banzebonsrylene (BTEX), by EPA 8020 and total <br /> r Department of Health Services as test methodology <br /> Y California <br /> i <br /> 3.0 HYDROGCDLOGX <br /> ' The project sit <br /> Count a is located within the Eastern San Joaquin <br /> Y Groundwater Basin. This basin is drained b <br /> Joaquin River and its tributaries. Y the San <br /> Mormon Slough. - Additional Recharge occurs along <br /> the San Joaquin River and SacramentoeRiverhDeltaarge onorth oin <br /> f <br /> �. Stockton. The geology of the Stockton site is composed of a <br /> thick sequence of river channel and flood plain deposits. <br /> ' These sequences contain .interbedded sand, <br /> clay layers. Depth to gravel, silt and <br /> jf approximatelygroundwater beneath the site is <br /> i- Control and 110 feet below grade <br /> Water Conservation District (1989 San Joaquin Flood <br /> flow is to the west-southwest. )• C€'oundwater <br /> tt <br /> The closest water well to the site is located approximately <br /> 180 feet east of the 10,000ter <br /> suPPIY well, operated b gallon diesel tank. This water <br /> „ open bottom completion at 448 feeten Water District, is an <br /> has been recorded at 128 to 135 feet below depth to water <br /> addition, elow grade. In <br /> three domestic wells and one irrigation well are <br /> - located between 600 and <br /> t the site. 900 feet to the north/northwest of <br /> 3 4.0 SUBSURFACE CONDITIONS <br /> 4.1 Field Inspection/Analysis <br /> The native soils encountered Burin <br /> silts--.and.°cla s g drilling consisted of <br /> shallow interval of 2ry 07feet the maximum depth explored. A <br /> Ll borings. gravel roadbaae was no in all three <br /> inspection <br /> recorded,,.th <br /> 3 g ye presence. of... ire t <br /> 9 Field :ins <br /> slight'--='h dt6barbon,;vapors An boxing 'ASB_2:.in”-the` <br /> 18 to 27 No .,aturated intervals indicative of Naderttai e <br /> or perched groundwater conditions were observed <br /> the borings- rued <br /> I any of <br /> E4.2 Laboratory Analysis <br /> The IaboratQ <br /> de"th <br /> rY analysis of'sample ASB2',-at. 27 feet (25__foot-- ---.__-- <br /> {; P ) .'rec"orded the_.presenca-:of <br /> --- � -=— ---Coneentrations of total ;benzene T-and toluene. --- <br /> ' were not detected above het 5 leum hydrocarbons as <br /> gasoline <br /> -� PPm detection limit in any of <br />