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30 June 1999 <br /> AGE-NC Project No 99-0624 <br /> Page 3 of 10 <br /> The estimated depth to ground water at the property is approximately 40 to 45 feet below surface <br /> grade.(bsg), based on the map titled Lines of Equal Depth to Groundwater Spring 1996 published <br /> by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD) <br /> i The map titled Lines of Equal Elevation of Groundwater Spring 1996, also published by the <br /> FCD&WCD, shows the property to be in an area where ground water flows toward the west and <br /> southwest, but this may be modified by changing recharge and discharge patterns Ground water is <br /> considered to be of beneficial use and is used for domestic, industrial and commercial purposes The <br /> inferred ground water flow direction at the near-by site is toward the southwest <br /> 3.4. SCOPE OF WORK <br /> Based on the results of the pre-UST removal investigation and the UST removal soil sampling, an <br /> unauthorized release of petroleum hydrocarbon compounds appears to have occurred at the site <br /> AGE proposes to collect soil and discrete ground water samples to evaluate the lateral and vertical <br /> extent of petroleum hydrocarbon impacts If significant hydrocarbon-impacts are encountered at the <br /> site, a second phase of investigation will be performed for installation of at least three ground water <br /> monitoring wells The preliminary site assessment will consist of the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil sample collection and analysis, <br /> • Ground water sample collection and analysis, <br /> • Monitoring well installation and sampling (if appropriate), and <br /> • Report preparation <br /> r <br /> 31 PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the PHS-EHD Additionally, preparation <br /> of a site-specific Health and Safety Plan Prior to mobilization, each soil probe and/or soil boring <br /> location will be clearly marked and a utility clearance obtained through Underground Service Alert <br /> The PHS-EHD will be contacted 48 hours prior to conducting investigation activities <br /> 32 SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Initially,AGE proposes to advance three soil probe borings in the vicinity of the previous boring B-2 <br /> and the former dispenser island to evaluate the lateral and vertical extent of the petroleum <br /> hydrocarbon impacted soil Proposed probe boring locations are illustrated in Figure 2 <br /> Advanced GeoEmironmental,Inc <br />