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1 <br /> 21 March 2006 <br /> AGE-NC Project No 97-0290 <br />' Page 4 of 15 <br />' from 2 68 to 2 71 Percent organic ranged from 0 6 to 1 5 Sample B4-25 was a fine sandy <br /> silt, sample MW1-30 was a poorly-graded, medium-grained sand, sample MW3-55 was a <br /> silty fine sand <br />' TPH-g was detected in ground water samples at concentrations as high as 45,000 µg/l <br /> (MW-2, 12 December 1998) TPH-d was detected at concentrations as high as 4,900 µg/1 <br /> (B4/1-13-99, 13 January 1999) BTEX compounds were detected at concentrations as high <br />' as 5,000µg/1,5,400 pg/1,2,200µg11 and 5,700µg/1,respectively(MW-2, 12 December 1998 <br /> and 17 May 2000) <br />' Dl-isopropyl ether (DIPS) and tertiary butanol (TBA) have been detected In water samples <br /> collected at the site Other oxygenates have not been detected Analytical results of all water <br /> samples collected at the site are summarized in Table 2 <br />' The highest concentrations of petroleum hydrocarbons in ground water were detected in <br /> samples collected from MW-2, P2, P3, B4, and B6 Petroleum hydrocarbons were not <br />' detected in water samples collected from MW-6 through MW-8 The lateral extent of <br /> Impacted ground water has been approximated at the site <br /> 3.0. 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 was located approximately 1,450 feet south of <br /> the site Wells No 3 and 4 are listed as off-line or destroyed <br /> No additional wells were located within 2,000 feet of the site on the California Department of Water <br /> Resources database and the San Joaquin County Flood Control and Water Conservation District <br /> map A figure that depicts the approximate locations of the water wells located within a 2,000 foot <br /> radius of the site was submitted with the AGE-prepared Corrective Action Plan -June 1999 <br /> 4.0. REGIONAL GROUND WATER INVESTIGATION <br /> The site is located within the Lodi ground water investigation area An investigation of <br /> tetrachloroethene (PCE)- and trichloroethene (TCE)-Impacted soil and ground water has been <br /> ongoing throughout northeast and central Lodi since 1989,when the contaminants were first detected <br /> in city water supply wells The Lodi ground water investigation encompasses the area bounded by <br /> ITuner road and Lockeford Road on the north, Kettelman and Elm Street on the south, Washington <br /> Street on the east, and Pleasant Avenue or Low Sacramento Street on the west Based on the <br /> Advanced GcoEn"ronmental,Inc <br />