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CLEARWEER <br /> G R O -U P, N C. <br /> at depths of 10 to. 20 feet bgs, were analyzed from each of the well locations . <br /> and analyzed- for TPH as gasoline, TPH as diesel fuel, and BTEX. No <br /> hydrocarbons were detected in the six soil samples analyzed. <br /> Groundwater sample's were collected ,from the three monitoring wells on <br /> February 28 and May 26, 1995 and analyzed f r TPH as gasoline, TPH as diesel <br /> fuel, and BTEX. Samples from all three monitoring wells contained TPH as <br /> diesel fuel; concentrations ranged from 10D parts per billion (ppb) in the <br /> sample from MW-3 to 530 ppb in the sample from MW-2. None of the three <br /> samples contained TPH as gasoline or BTEX. <br /> Groundwater was encountered at appro ately '22_ to 23 feet bgs- while <br /> drilling the monitoring wells. Static water levels during the May 26 sampling <br /> event ranged from 17.87 feet to 19.14 feet ,below the top of casing. <br /> Groundwater elevation data collected onw Feb nary 28 indicated a groundwater <br /> gradient toward the south, and data collecte on May 26 indicated a gradient <br /> toward the north.. The groundwater.gradient may fluctuate because the site is <br /> near. the Stanilaus River; .however; additional data is needed to"evaluate the <br /> the. influence, if any, that the river has on th local 'groundwater gradient.. <br /> _ . .2.0 PROPOSED WORK <br /> a , In the Quarterly Monitoring Report for the s Gond quarter 1995 (dated July la, . <br /> -_1995), Clearwater recommended the follow' g work fora more complete <br /> characterization of.the site: <br /> Investigate the vadose, zone soil in the arE a of the former fuel dispenser <br /> r _ Evaluate the lateral extent of dissolved h droearbons in groundwater). <br /> Obtain additional data regarding the grotuidwater gradient at the site. <br /> 2.1 Installation of Sail Boring and.Morlito 'rig wells <br /> Clearwater proposes to investigate potential.vadose zone contamination in . <br /> the vicinity of-the former fuel dispenser by drilling and "sampling one soil <br />�^ D104 WP 9/95 3 <br /> r <br />