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s� Phase I Environmental Site Assessment City of Stockton Multi-Modal Station/Shopping Center Page 21 American Street were also identified TPH quantified as treating oil was noted in all of the soil samples analyzed for this compound TPH-d and TPH-g were not detected in any of the soil samples analyzed for those constituents TPH-d, at concentrations of 0 13 and 0 58 mg/L, was detected in the two of the three groundwater samples collected According to a permit dated March 29, 2001, there is a 10,000-gallon UST currently on site and active until at least December 31, 2001 t Genova Bakery 749 N Sierra Nevada One 350-gallon gasoline UST was removed in September 1987 The UST was located between the a sidewalk and the west side of N Sierra Nevada The site received a "No further action" letter from 1 PHS/EHD on April 29, I997 303 N.Pilgrim There was apparent gasoline contamination of the soil in 1990 An excavation was conducted to remove the contamination Upon receipt of the laboratory results,the site received "no further action" status from PHS/EHD on October 24, 1990 County of San Joaquin Human Services Agency 145 South Sutter Street Y Fourth Quarter 2000 Groundwater Sampling Report, dated December 2000 In April 1988, nine USTs from a former gas station were removed The pit was backfilled with clean soil after the excavation of 2,000 cubic yards of contaminated soil In December 1988, hydrocarbons were detected in groundwater from two of the three monitor wells on site (benzene at 28,000 µg/L in MW-2 and 2 8 p.g/L in MW-3) In August 1991, five additional monitor wells were installed The highest concentrations of hydrocarbons were found down-gradient at MW-7 and MW-8 In 1995, MW-2A and MW-3A, deeper monitor wells, were installed During the installation of MW-2A free product was observed in the soil and groundwater Quarterly groundwater monitoring has been conducted since August 1996 During the November 2000 monitoring event, the groundwater gradient was measured to be 0 00024 ft/ft to the north-northeast Laboratory analyses indicated the highest concentration of benzene to be 18,500 0 5 µg/L, toluene at 286 µg/L, ethyl benzene at 3,070 µg/L, total xylenes at 5,950 gg/L, and TPH-G at 57 3 mg/L All of the highest concentrations were detected in MW-2, which is immediately cast of the former USTs This monitoring event marks the first tirne TPH-G has been detected in up-gradient well MW-9 222 E Weber One 5,000-gallon diesel UST was removed from the site on April 10, 1990 This UST was used to store unleaded gasoline at one time An additional 10,000-gallon gasoline UST was removed on August 19, r 1996 The laboratory results from the base of this excavation indicated the presence of benzene as high as 800 ttg/kg, toluene at 42,000 gg/kg, ethyl benzene at 26,000 µg/kg, total xylenes at 140,000 Rg/kg, and 3 TPH-G at 1,200 mg/kg MTBE was not detected, however the detection limits were raised from 5 0 }tg/kg to 25 to 250 µg/kg Detection limits on benzene were also raised to 2,500 gg/kg in two of the tank removal samples On February 2, 2001, a Geoprobe investigation was conducted 422 San Joaquin County Office of Emergency Services Condor submitted a request to the San Joaquin County Office of Emergency Services(OES)to review the non-confidential portions of the Risk Management Programs and Hazardous Material Management I %4 CONDOR