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i I07 November 2003 iAGE-NC Project No 98-0492 Page 3 of 9 During the reconnaissance a door-to-door survey was conducted of residential properties to locate ' domestic water wells No domestic water wells were located during the search On 18 September 2003, Mr Eric Medeiros of the City of Manteca Water Well Division was ' contacted by an AGE representative According to Mr Medeiros, drinking water at and near the site is currently supplied by the City of Manteca municipal water well network Mr Medeiros provided ' AGE with the well log for City of Manteca Municipal well Number 13, located 2,000 feet south of the site ' Approximately 23 monitoring wells, at three different sites were observed within 2,000 feet of the site In addition, City of Manteca Municipal Water Well Number 13 is located 2,000 feet south of the site in the cross-gradient direction. Copies of the well drillers' reports are included in Appendix ' A, a summary of water wells located from the review of well driller's reports is included in Table 2, locations of the wells are depicted on Figure,33' ' 2 4 UST REMOVAL One 10,000-gallon diesel UST (TK1), one 10,000-gallon leaded gasoline UST (TK2) and one 10,000-gallon unleaded gasoline UST (TK3)were removed from the site on 05 August 1999 Two soil samples were collected from beneath each UST and eight samples were collected from the soil ' stockpile MTBE was detected in three of the six soil samples collected beneath the USTs at concentrations as high as 0 32 milligrams per kilogram(mg/kg) Petroleum hydrocarbons and other fuel oxygenates were not detected in samples collected beneath the USTs Total petroleum ' hydrocarbons quantified as gasoline(TPH-g) and diesel(TPH-d)were detected in stockpile samples at concentrations as high as 4 8 mg/kg and 40 mg/kg, respectively ASTs and a concrete pad have ' subsequently been installed over the foixner USTs location Analytical results of soil samples collected from the UST removal can be found in Table 3 ' 3.0. ASSESSMENT OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER ' On 20 March 2000, three soil borings (131 through 133) were advanced at the site as part of site assessment activities Methyl tertiary butyl ether(MTBE) was detected in the soil sample collected from probe boring B2 at 20 feet bsg at a concentration of 1 6 mg/kg No other analytes were detected ' above laboratory reporting limits in the soil samples collected and analyzed from B1 through 133 TPH-g,benzene, and MTBE were detected in the grab ground water samples collected from.borings ' Bl through B3 at concentrations as high as 1,200 micrograms per liter (pg/1) TPH-g, 310 gg/1 • benzene and 10,000 µg/l MTBE In addition TBA was detected in the water sample collected from Advanced GeoEnvironmental,Inc