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a 1 Phase I Environmental Site Assessment City of Stockton Multi-Modal Station/Shopping Center Page 17 escaping from the tank during the removal due to a broken water main above the cement vault that encased the tank A water sample was collected from the second tank Total volatile petroleum ' hydrocarbons were detected in the water sample at 98 mg/L Total extractable petroleum hydrocarbons were detected in the soil sample SWO at 110 mg/kg and in the water sample at 8 0 mg/L An additional soil sample was scheduled to be collected on June 7, 1988 The site was recommended for closure on January 25, 1994 The site received a "no further action" letter on February 28, 1994 from the SJCPHS/EHD The CRWQCB closed the case on March 19, 1996 f h Unocal#0187 437 E.Miner The site was an operating service station from 1922 through 1992 Two 1,000-gallon gasoline USTs and one 550-gallon waste oil UST were removed from the site in 1967 These USTs were replaced by two 10,000-gallon gasoline USTs and one 280-gallon waste oil UST The newer USTs were removed in r January 1992 Petroleum hydrocarbons were not detected beneath the USTs TPH-G and benzene were detected beneath the piping in soil samples at concentrations of 150 and 0 81 mg/kg, respectively An additional 130-gallon waste oil UST was discovered on March 2, 1992 and removed in May 1992 No petroleum hydrocarbons were detected in the soil from that tank removal In October 1993, eight soil a borings were advanced TPH-G was detected at 2,900 mg/kg (16 5 feet bgs) and 2,300 mg/kg (31 5 feet bgs) in the soil samples In July 1994, five additional soil borings were advanced TPH-G was detected at 19,000 mg/kg at 45 5 feet bgs Five monitoring wells, two soil borings, and one soil vapor extraction Y 1 (SVE) well were installed in August 1995 Concentrations of TPH-G in the SVE well ranged from 3,400 mg/kg to 20,000 mg/kg in the soil samples collected Groundwater samples collected from a boring in 1998 indicated the presence of TPH-G at concentrations ranging from 660 to 73,000 gg/L and benzene „ from 6 9 to 4,200 µg/L TPH-G was detected at concentrations ranging from 85 to 4,000 gg/L in January 1999 groundwater samples 3 Chet's Automotive 545 E.Miner Avenue Three 1,000-gallon gasoline USTs were in service during the late 1970s Removal of these tanks was attempted on August 16, 2000 A UST failed during removal and approximately 120 gallons of waste fluids were discharged The USTs and piping were removed on August 25, 2000 A total of six samples were collected from underneath the tanks TPH-G was detected at concentrations up to 5,800 mg/kg, benzene up to 0 39 mg/kg, total xylenes up to 960 mg/kg, and TPH-D up to 2,400 mg/kg The USTs and piping were full of holes and badly deteriorated upon removal from the site t' 4 2 1.2 4 Locations 1,000 feet or more from the site 540 N.Aurora Based on a UST Program Tank Permit Application Information form, a 4,000-gallon leaded gasoline UST was removed prior to December 27, 1988 The date of the UST installation is unknown In addition to this tank, there were three USTs underneath the sidewalk along Oak Street and 2 USTs along the railroad tracks on Carnation property The tanks on Oak Street were removed by Chevron �{a Stallworth Auto Sales 602 North California Street Ground Water Monitoring Report—Fourth Quarter 2000, dated 11 January 2001 The five existing monitoring wells were sampled on December 4, 2000 As there were inconsistencies between the December 4, 2000 analytical results and previous monitoring events, MW-2, MW-3, and MW-4 were resampled on December 26, 2000 Depth to groundwater was found to range from 27 2 to LJ CANDOR I