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de <br /> PRELIMINARY YMROGEOLOGIC ASHK SMFNT R1vPORT <br /> 14800 WEST FRONTAGE ROAD <br /> MANTECA, CALIFORNIA <br /> DELTA PROJECT NO. 40.88-47-9 <br /> tK• 1.0 rNTROI3UgnoN <br /> Delta Environmental Consultants Inc. (Delta), has been authorized by Moore Petroleum, Inc.,to conduct <br /> a hydrogeologic investigation at the Exxon gas station Iocated at 148M West Frontage Road, Manteca, <br /> • � 3 <br /> California (T.1S.,R.7E.,Section 28,MDB&M) (Figure 1). Delta's investigation was initiated in response <br /> to the detection of petroleum hydrocarbon constituents in the soil adjacent to underground storage tanks <br /> t• <br /> at the site. <br /> { ° 1.1 3'nrnase <br /> The purpose of this hydrogeologic iavestigation is to determine the lateral and vertical extent of petroleum <br /> constituents in the soil at the site. This investigation also provides information regarding the presenre <br /> t,a or absence of petroleum constituents in the ground water at the site. The final objective is to recommend <br /> future investigative and/or remedial activities at the site. <br /> 1.2 Scone or Work <br /> Activities that have been carried out in order to help achieve the purpose of the investigation include <br /> the following. <br /> r <br /> Reviewed available geologic and hydrogeologic:data <br /> pertinent to the site. } <br /> � t <br /> • Drilled two standard-penetration,hollow-stem-auger soil borings. <br /> Complete each soil boring as a monitoring well. <br /> f ClassilT soils according to the Unified Soil Classification System (USCS). <br /> to <br /> f ' Screened the recovered soil samples with a photoionization detector (PID) for total organic <br /> ---- vapors' <br /> �i <br /> f <br />