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' Site Background Information COMFORT AIR,INC. 1607 Turnpike Road, Stockton, California SITE BACKGROUND The Comfort Air facility is a heating and air conditioning sales and repair business located at 1607 Turnpike Road, Stockton,California,in an area of low topographic relief in southwestern Stockton UNDERGROUND STORAGE TANK REMOVAL One 550-gallon gasoline(UST)was removed from the site in January 1989 Following tank removal, soil samples were collected beneath the UST and submitted to a laboratory for analysis for petroleum hydrocarbons Total petroleum hydrocarbons as gasoline (TPH-g) was reported in soil samples at concentrations as high as 5,800 milligrams per kilogram (mg/kg) IPREVIOUS SITE ASSESSMENT In February 1992, three groundwater monitoring wells (MW-1, MW-2 and MW-3) were installed Inear the former UST area by RESNA Industries of Escalon, California Evidence of petroleum hydrocarbon-impacted soil was detected in all borings at depths between 20 and 35 feet below surface grade (bsg) Initial ground water samples contained TPH-g at concentrations as high as 300,000 micrograms per liter (µg/1) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes, BTEX) at concentrations as high as 17,000 µg/l A fourth groundwater monitoring well was installed northeast of the former UST area in October 1993 Evidence of petroleum hydrocarbon soil contamination was detected in soil samples collected at 40 and 45 feet bsg Initial ground water samples detected TPH-g at concentrations as high as 6,800 µg/1 and BTEX at concentrations as high as 1,400 µg/1 I In May 1994,a fifth ground water monitoring well(MW-5)was advanced near the northeast comer of the site Petroleum hydrocarbons were not reported in soil samples submitted for analysis TPH-g and BTEX were reported in initial ground water samples collected from MW-5 at concentrations up to 93 µg/1 and 13 µg/1, respectively On 25 and 26 October 2000, three additional ground water monitoring wells were installed at the I site Two of the wells (MW-7 and MW-8)were installed in first encountered ground water and one well (MW-6)was advanced to a depth of 65 feet bsg to monitor deeper ground water Soil samples collected from the pilot boring for MW-6 contained concentrations of TPH-g as high as 4,100 mg/kg, Ibenzene as high as 17 mg/kg, 1,2-dibromoethane (EDB) as high as 460 mg/kg and 1,2- dichloroethane (1,2-DCA) as high as 410 mg/kg Advanced Geotnvlronmental,Inc