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' SITE H]STOI2Y CANEPA'S CAR WASH 6230 Pacific Ave Stockton, CA a's Car Wash consists of an automated car washing facility, a fuel Caiaepstation and a convenience The site is located at 6230 Pacific Avenue, in Stockton California The car wash and fuel station rn operation for over two decades nhas store n Lias been Between February 25 and March 3, 1993, three underground were aenaoved b3' WH' Environmental (W�) and replaced with a doubled slines stemrid dispensers consisted of riga 12.000-gallon gasoline USTs and one 51000-gallon diesel UST Y Tile USTs upon removal of the tanks and piping, it was discovered that the fuel lines had leaked arid rthat the S sha been overfilfed Approximately 600 cubic yards of soil were removed from the UST excavation excavated soil was subsequently characterized and disposed of at forward Landfill at the USTs lead At least 16 soil samples were collected from the tank excavation for laboratoryn area Tlie I iii Manteca, California results Indicated predoriirnantly low TAH-G analyses Tlae laboratory (gasoline at SIS mg/kg) acrd low BTEX concentrations One (1) soil sample collected from the northeastern sidewall of the tan]`excavation contained 773 Mg/kg and BTEX concentrations up to 170,000 m� sample at 32 iia baa (total xylenes) TPH-D (diesel) was detected inne soil At least seven soil samples were collected from beneath the former fuel dispenser islands for laboratory analyses Elevated concentrations of TPN-G (up to 3 $00 l. concentrations ranrgtiag from 26 mg/kg to 560,000 ring/kg were detected rn the fuel di mglg) and BTEX TPH-D (diesel) teas not detected at or above the laboratory reported detection limit 11, the soil samples collected from beneatil the former fuel dispenser islands samples fOri March 12 199x, soil boring (13-I ) was installed islands Groundwater was eiicby WW Immediately east of tire foriner fuel dispenser ouiitered at approximately 56 feet below the ground surface (b�,s to stiang petroleum odors were detected froran 15 #eet bas to 56 5 feet bgs coticentratious were detected it, soil samples collect9 5 feet bgs -G Moderate ed frons 35 feet bgs#0 Elevated TPH-G and BTEX following the soil boring installation, a network of zailie SVE wells were drilled and installed in the the fire] dispenser islands According to the former consultant, William H fox of area of were installed without conaplling geological lobs and without the collection of laborator�yH amples as agreed upon by the PHS/EHD due to trine constraints Mr Fox indicated that based on field observations all the SVE wells showed signs of gasoline contamination during installation An internal combustiong (ICU) was installed at the site for vapor extraction and treatment under tlae Authority to Constructof the San Joaquin Valley Unified Air Pollution Control Distract (APCD) dated October 7 unit 3 The was started ora March 11, 1994, and o erated throuo issued by p �h June 10, 1995 Based on field monitoring ICU Provided b}' u'Hf, average influent organic vapor concentrations, measured with a photo ionization detector I'ID exceeded 2 p p notes ( )� ,200 arts per txiillron (ppiil) Tile last itifluent measurement collected from the s}stern Was 2 l45 ppiii {May 15, 1995) Benveeri Septerlaber 24 and 30 1993, VSJ I}: riistalled four (4) monitoring wells (M -1 tltrou h the site I,oav to elei ated concentrations of gasoline were detected vi *rouridw MVtr-1 through MW-4 yield observations indicated moderate to stroll"gasoline odorsg MW 4) at ater samples collected from from 20 feet in 55 feet bgs and pit MW-2 from 40 feet to 67 feet b f i n the soil at MW-1 and NNW-2 -,N'eie not anaiyzed in the laborcttonv Analyses ofsoil analyses of samples collected fiom MW-,Sol' sainplcs collected from MW-1 and MW-4 indicated tha[ TI'H-G of BTEX xRseie not detected at of above the laboratory reported deter W ; tion