SITE INFORMATION AND CORRESPONDENCE

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Moore Truck Lines Page 2 3400 Newton Road December 20, 2010 Stockton, California 95205 This commercial property site is currently vacant. Formerly this industrial site operated as a trucking and truck maintenance facility with an office, vehicle repair shop, and 20 loading docks. In January 1999, four underground storage tanks (USTs) were removed after being in operation for approximately 37 years. The USTs included one 12,000-gallon and one 5,000- gallon gasoline tank, one 5,000-gallon diesel tank, and one 275-gallon waste oil tank. Analytical results of eight soil samples collected beneath the four USTs and four composite soil samples collected from the stockpiles are enclosed along with a site map that illustrates the soil sampling locations utilized during the UST system removal. In June 1999, five soil borings were advanced at this site; soil boring 131 was completed as monitoring well MW-1, screened between 44 and 64 feet below surface grade; soil borings B2 and B5 were advanced to 55 feet bsg, and B3 and B4 were advanced to 30 feet bsg. A map illustrating the locations of the five borings and the analytical results for soil and groundwater samples collected from the five borings are enclosed. Monitoring wells MW-2 through MW-4, all screened between 55 and 75 feet bsg, were installed in September 2001. Cone penetration test (CPT) boring CPT-1 was advance to total depth of 100 feet bsg in April 2004; and MW-5 through MW-7, screened between 55 and 70 feet bsg, and MW-8, screened between 60 and 70 feet bsg, were installed in June 2008. A map illustrating the locations of the eight monitoring wells and the CPT-1 boring and the analytical results for soil and groundwater samples collected from the CPT-1 boring and soil samples collected from the monitoring wells are enclosed. Tetrachloroethene (PCE) was detected at 2,100 micrograms per kilogram (Ng/kg) in stockpile sample SP-4 and trichloroethene (TCE) was detected in soil samples TK-4-8' and SP-4 at 220 and 490 pg/kg, respectively, during the removal of the USTs. As a result, groundwater samples collected during the 2005 quarterly sampling events were analyzed for PCE and TCE. PCE and TCE concentrations were not detected at a reporting limit of 1 microgram per liter (pg/L) in any of the groundwater samples tested. The groundwater analytical results are enclosed. Well Receptor Survey, dated 15 November 1999, documents an on-site domestic well approximately 135 feet north of the former UST system with a total depth of approximately 263 feet bsg. A second domestic well, located approximately 90 feet southeast of the former USTS, with a total depth of approximately 160 feet bsg, was abandoned in December 2000, following the detection of total petroleum hydrocarbons as diesel (TPH-d) in groundwater at 280 pg/L. Several additional wells are located within 500 feet of this site along with one San Joaquin County Well (30E1) located approximately 1,500 feet southwest of the site, and two California Water Service Company pumping stations, STA. 79 (well 43E1) and STA. 16 (well 43D2), located approximately 3,000 feet east and southwest of the site. The only well with contaminants of concern detected in the groundwater is MW-1. It was last sampled in February 2008 and found to contain 390 pg/L methyl tertiary-butyl ether (MTBE) and 400 pg/L total petroleum hydrocarbon as gasoline (TPH-g). MW-1 has consistently been dry and unable to be sampled during the quarterly sampling events in 2008 and February 2009. AGE has calculated the adsorbed mass of TPH-g at this site at 1,749 pounds of gasoline or 279.8 gallons of gasoline.