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SITE HISTORY CANEPA"S CAR WASH 6230 Pacific Ave, Stockton, CA Canepa's ,Car sash site is located at consists of an automated car Operation for over two Pacific Avenue washing facili two decades. , in Stockton, California? a fuel station and a conve The car sash nience store. The Between Februa and fuel station has been in were removed W and March 3, 1993 consisted of Y �� Environmental (W�e underground story two 12,000-gallon ) and re rag tanks(USTs removal of the gasoline USTs and one 5 OOped With a ), firel Imes and dispensers overfilled. tanks and piping, doubled walled system p g, it was discovered that the gaflon diesel UST. The USTs excavated so� proximately 600 cubic fu lines had leaked As ported by WHF least ]b was subsequentl Yards of soil were and that the ' upon soil samples were colt ct aaotarized a„ removed from the USTs had been indicated d disposed of at Forward UST excavation predominantly row Tp m the tank e Landitll in anon area. The sample collected frau, xcavation for laborato Manteca, California, At the no e G (gasoline at <15 B EX clyses. The laborator BTEX from t, rtheastern rr' k9) and lour at 32 m P to 170,000 ,ug/kg (total ll y the tank excavation oncen Y results mg/kg. At least seven soil g (total x contained 77trations. One (1) soil laboratory analyses. rnples were collectedSfrorTPH_f} (diesel) mglkg TPH-G and ranging from 2Elevated ) was detected in one soil s concentrations ot` TFH-G beneath the forme was not detected a or above 6 ey00b0o oto (up to 3 800 r fuel dispenserdale glkg Fere detected in the f mg/kg) and BTE is,, for the former fuel dis ry reported eel dispenser X concentrations Spenser islands. P detection limit in the i1 sr soil samples. TPH-D On March i2 �p1es collected from beneath islands. ' 1343, soil boring g (g-1) �'as installed b to strop as encountered ata 'HF 11 nLdiatel g petroleum odors were detected fratpnroxirnately 56 feet below the east of the former concentrations were detected in soil sem fuel dispenser 15 feet bgs to 56.5 ground surface b Ales collected from 3S feet b feet bgs. Elevated Tp( gs)• Moderate Following the soil boring gs to 56.5 H-G and BTEX the ]Fuel dispenser islands. feet feet bgs. installed �vitf,o it compilin ' a network of nixie According to the for,r,er wise t nE wells w g geological logs were drilled and installed i by the PHS/ERD, due to time g and without William H. Fox of n the area of wells shotived signs of me constraints, Mr. FON the collection WrfF, the SVE vu installed at the site far gal aline contaminationtre '� indicated of laboratory ells were that based pn field ob5er alas, all of the S V agreed n Joaquin Valle Por extraction during installation, Q„ March I I Y Unified Air Pollution Control Di trrctnt An i17ternal combustio E 1394 under the Authori n unit (1CU} was average ' and operated throe (ApCD ' to Construct issued b in organic vapor through•lune 10, 1935, Based dated October 7, I993. The ICII y the San 2,200 parts lir million por concentrations, measured will, n field monitorin provided by 15, 1995). (Ppm). The last influent measure g notes was started ment collected firm xtheion detector (PfD W Between Se system ), exceeded September was 2,145 ppm(May site. Law 28 and 30, 1993 to elevated concentrations of tIv-oug installed four{4) ;monitorin !� N'1 W-4• Field observationsgasoline were g wells(MW_ feet to 55 feet (� indicated detected,n groundwater sal I through hi were gs and at MW 2 from 40.feet o 67 feetcrate to strap moles collected from MW_e not analyzed in the lab g gasoline odors in 1 indicated that TPH_ rY• Anal s gs• Soil sem the soil at MW-] feet b G or. 13TEX �„ Yes of soil anal pies collected frorn from 20 gs to the capillary were not detected at or above the laboratory es collected from 1VZW-1 and l� W-2 Y f'inge• A su,nmary()f tile soil and groundwater MW-3 and reported detection limits MW-4 ` analytical data is ca from 20 ntained in Interim