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ffl� Rai SG Color Spot, Inc. D October 10, 1589 (88168B) 3 i r The soils sui:rourding the UST fill port and its southwestern corner � f were visibly stained and smelled of diesel fuel. Field monitoring with a photoionization detector also indicated elevated total volatile petroleum hydrocarbon (TPH) concentrations. Soil samples collected after the UST was "j removed exhibited ethylbenzene, total xylene and TPH concentrations in excess of applicable regulatory action levels. As a result of the soil contamination, SGD was retained by Color Spot, Inc. to verify the existence of soil contam- ination, delineate the lateral extent of contamination, and to evaluate adjacent domestic ground water wells for contaminants Ossociated with diesel fuel. METHODS OF INVESTIGATION Ground Vater Sampling. The ground water .in three existing domestic E_, and irrigation water wells was sampled. The wells were sampled to evaluate the existence of ground water contamination and to obtain information on sources of contamination. The well locations are illustrated or Plate 1 - Site Map. Soil Vapor: Survey, A soil vapor survey,was conducted to evaluate the subsurface for volatile hydrocarbon vapors. The "survey was performed at the Color Spot Lodi facility on August 15, 1989. The survey was conducted under San aF, Joaquin Local Health District Permit 89-1857. The 10 monitoring points are j illustrated on Figure 2 - Soil Vapor Monitoring Locations le the soil data are found in Appendix C.' The portable field gas chromatograph monitoring locations were ievaZuated ufiingoa (CC) and a photoionization detector (PID) to .confirm and delineate .the lateral extent of diesel fuel contamination. Laboratory Analysis. The chilled water samples were delivered a accompanied by chain-of-custody documentation to the laboratory for analysis, a The 'graandTP r samples were analyzed for fuel fingerprint identification includin benzene, ' toluene, ethylbenzene, tot al xylenes {Bl EX 1 2- ,F dichloroethsne (EDC), ethylene dibromide EDg )' 1 anal {. ),.and total Lead. The samples were analyzed by EPA meth Vnd for total lead uy EPA method 7420 following } digestion by EPA method 3050. sf FINDING5 t The Color Spot Lodi facility is centrally located in the northern portion of the north-northwest treading San Joaquin Valley. The facility is located in a semi-rural porti"on of San Joaquin County, about 1 mile south of the R, Cil ot .Lodi, City The general surrounding land uses are residential-and-_agricul-- tural. Specas—of - -- --- „ -- -- yy- .—January -1989; to the north of the. site are a T { cemetery, residential development, and a nursery;" To the east is a vineyard, to the south are apple orchards, and to the west are the frontage road and State Highway 99: :