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Site Characterization Report <br /> ABF Freight System,Inc. <br /> Manteca,CaliforniaPaee 2 <br /> • Holocene age, the Turlock Lake Formation of Pleistocene age, the Laguna Formation of Pliocene <br /> age, the Mehrten Formation of Pliocene age, and the Valley Springs Formation of Miocene age <br /> 1 3 2 HydrolM <br /> The subject site falls within the Central Valley aquifer system This aquifer occupies most of a <br /> large basin in Central California between the Sierra Nevada and the Coast Range Mountains The <br /> basin contains a single, large, basin-fill aquifer system Groundwater in the valley is under <br /> unconfined to confined (artesian) condition, primarily depending on depth, most of the shallow <br /> ground water is unconfined (USGS, 1995) According to the Manteca City Municipal Water <br /> District, the direction of groundwater flow in the vicinity is approximately northwest The <br /> closest production well is approximately a/4 miles to the southeast Depth to groundwater was <br /> expected to be between 10 to 20 feet below surface grade (bsg) <br /> 1.4 Site Background <br /> One 10,000 gallon diesel underground storage tank (UST) was removed by CAL INC on March <br /> 18, 1998 A copy of the Underground Storage Tank Closure Report is included as Appendix 3 of <br /> this report The sampling and testing following the tank removal was completed under <br /> supervision of Mr Michael Kith of the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) The total depth of the UST excavation was 11 feet <br /> • and groundwater was encountered at approximately 10 5 feet During excavation and after the <br /> UST was removed from the excavation stained soils the presence of hydrocarbons was observed <br /> in the base of the excavation Soil samples collected from the excavation stockpile and <br /> groundwater sampled from the excavation confirmed diesel contamination Soil and groundwater <br /> samples included the following <br /> • Two soil samples collected from the side walls of the excavation at the soil groundwater <br /> interface (TI-NW-10'4", T1-SE-10'4"#2), <br /> • One soil sample collected from beneath the diesel dispenser (Di-4'), <br /> • Two soil samples collected from the excavation stockpile (SP 1-S, SP 1-N), and <br /> • Two groundwater samples, one collected after the UST removal (Excavation 11') and one <br /> after purging of the excavation groundwater (Pit Water) <br /> A summary of soil and groundwater results is presented below in Tables 1 and 2 <br /> 11SERVERIIC-DRIVFIPROJECTS132721P1ans and ReportMBF Freight Site Characterization Closure Report doe 11/17/98 <br />