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10 S eptember 2001 <br /> AGE-NC Project No. 98=0497 <br /> 'Page 3 of 5 <br /> water. Table 3 contains analytical results from previous quarterly ground water monitoring events. <br /> Figure 5 illustrates the inferred extent of hydrocarbon,c ntamination in ground water at the site. <br /> 2.4: GROUND WATER-DEPTH AND FLOW DI CTION <br /> Average depth to ground water has been approximately_f 8 feet below.surface grade(bsg) during the . <br /> previous four quarters of groundwater monitoring at the site,-Review•of historical depth to ground <br /> water,maps (San Joaquin County Flood-Controi District and Water Control District) dating.back to' , . <br /> 1971 suggests that ground water depth near the site.has fluctuated be#ween 60 and 100 feet bsg: <br /> Based on the ground water elevation data collected from. the three on-site-ground water monitoring <br /> wells over the last four'quarters, groundwater.flow:dire tion at the site.is generally toward the east <br /> -to east northeast. The plumb,of impacted ground water has not been delineated in the down-gradient <br /> direction. <br /> 3.0.- SCOPE OF WORK •.. <br /> Based upon 'results obtained during.previous investigations,`the PHS-EHD has required this <br /> investigation to determine the lateral.extent of hydrocar .on-impacted soil and ground water.at the <br /> site.AGE proposes to advance and.sample three soil b rings.at the site;two of the borings,will be <br /> completed as ground water.monitoring wells: <br /> The investigation.will consist ofthe.follawing`tasks: <br /> .. <br /> Obtaining an access agreement for work to be erformed on adjacent property, permitting , <br /> and pre-field work preparations; <br /> + Soil.probe boring advancement and soil'sample ollection and analysis; <br /> • . Monitoring well.installation, development ands ling and analysis; <br /> . <br /> 'Report preparation..-. <br /> Each of these tasks:are discussed below in detail. <br /> Advanced GeoEnvironmentat Iac. <br />