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10 June 1999 <br /> AGE-NC Project No 97-0290 <br />' Page 4 of 26 <br />' Other oxygenates have not been detected Analytical results of all water samples collected <br /> at the site are summarized on Tables 5 and 6 <br /> • The highest concentrations of petroleum hydrocarbons in ground water were detected in <br />' samples collected from MW2,P2,P3,B4 and B6 Petroleum hydrocarbons were not detected <br /> in water samples collected MW6 and MW7 The lateral extent of impacted ground <br /> water has been approximated at the site (Figure 3) <br /> 24 RECEPTOR WELL SURVEY <br /> Drinking water near the site is currently supplied by the City of Lodi municipal well system The <br />' City of Lodi Well No 2 is located approximately 550 feet north of the site Well No 4 is located <br /> approximately 900 feet east of the site Well No 3 is Iocated approximately 1450 feet south of the <br />' site Well Nos 3 and 4 are listed as off-line <br /> No additional wells were located within 2,000 feet of the subject property on the California <br /> lieDepartment of Water Resources database and the San Joaquin County Flood Control and Water <br /> Conservation District map Figure 6 depicts the approximate location of the water wells located <br /> during the well search within a 2,000 foot radius of the site <br /> 1 <br /> 3.0. IN-SITU AIR SPARGING PILOT TEST <br /> 1 From 10 through 13 May 1999, an in-situ air sparging (IAS) pilot test was performed at the site A <br /> soil vapor extraction pilot test was performed on 13 May 1999 (Section 4 0 ) This pilot test was <br /> 1 performed to provide data to evaluate the feasibility of air sparging as a remediation method at the <br /> site <br /> 31 PROCEDURES <br /> 3 1 1 System Installation and Set-Up <br /> Initiation of the IAS pilot test involved temporary connection of an air compressor to sparging well <br /> SW-2 An air injection rate of approximately I cfin was maintained for the first 20 hours The flow <br /> rate was then increased to approximately 2 to 3 cfm After approximately 30 hours, the compressor <br /> was detached from S W2 and connected to S W 1 with the higher flow rate <br /> For the IAS pilot test, wells M W 1, MW2, V W i A, V W 1 B, V W I C and six vapor monitoring points <br /> Advanced GcoEnvi ron mental,Inc <br />