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' Site Background Information ' FIRE STATION #2 - South UST Area 110 West Sonora Street, Stockton, California ' The site is bounded on the north by Sonora Street, on the west and south by Madison Street and on the east by Commerce Street Presently a single building is located at the northern portion of the site, occupied by the City of Stockton - Fire Prevention Department A diesel/gasoline fueling system previously occupied the northwestern portion of the site, a petroleum hydrocarbons release from the associated underground storage tanks (LTSTs) is presently being remediated The properties ' surrounding the site are mostly industrial, with a few residences east of the site ' 2 1 PREVIOUS INVESTIGATIONS During redevelopment construction on the southeastern portion of the site, a former accelerant fuel line used for fire training was discovered The product line was uncovered, removed and soil was sampled and analyzed for petroleum hydrocarbons In addition, a former UST location was discovered at the eastern end of the pipeline during the pipeline removal, this location was re- excavated and a soil sample was collected and analyzed Based on laboratory analytical results • Total petroleum hydrocarbons as diesel and motor oil (TPH-d and TPH-mo)were detected at concentrations of 2,300 mi Iligrams/kilo gram(mg/kg)and 4,000 mg/kg, respectively, and • Total lead at 245 mg/kg in one soil sample collected at a depth of four feet below surface grade (bsg) from the southwestern-most fuel dispersion device (burn-area) 0 TPH-d and/or TPH-mo were detected in remaining soil samples at low concentrations Subsequently, at the request of the San Joaquin County Environmental Health Department (EHD) by letter dated 30 May 2002, AGE submitted Preliminary Site Assessment Work Plan -South UST Area, dated 20 June 2002, the work plan was approved by the EHD by letter dated 21 June 2002 On 08 and 15 July 2002, a total of five soil borings were advanced at the site Based on the soil and ground water data collected, AGE concluded Silt and clay with a tan or gray color, apparently depending on hydrocarbon impact, was encountered from a depth of approximately 5 feet to 28 feet bsg Gray to tan sand with gravel I was present at depths of 28 feet to 30 feet bsg Silt and clay was encountered again at depths of 30 feet to 50 feet bsg A stratigraphic cross section is depicted in Figure 3 The maximum hydrocarbon concentrations in soil were detected in the area of the former burn pit area,sample#2 south The maximum concentrations of TPH and BTEX compounds . were detected in samples collected above 20 feet bsg f