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LAT"HROP PROPERTY WKA No. 1184.02 r January 30, 1992 Pago 3 exploratory soil borings with eomontlbentonite slurry; she also observed grouting of the monitoring wells. The drilling rigs were equipped with modified California samplers containing clean,two-inch- diameter brass tuoes. Subsurface soil sample tubes were sealed with PTFE-coated sheets, plastic end caps and tape;ground water samples were collected in sterilized amber glassware and/or plastic bottles, as appropriate. All samples obtained from the property were preserved F"+ on ice and submitted under chairnof-custody to a California-certified laboratory for analysis. Drill cuttings and subsurface soil samples were screened for petroleum hydrocarbon k contaminants in the field with a Bacharach Model 0023-7356 Organic Vapor Analyzer(OVA). Drill cuttings and ground water purged during well development were each placed in DOT• a approved 55-gallon labelled drums that wore left on-site. The contents Qf three drums-- containing soil was romedlated along with excavated soils during uncontrolled aeration. The contents of four drums containing well development/purge water was discharged on-site by Yrw,l Mr. Ouaresma subsequent to water analyses that revealed non-detectable contaminant concentrations. The three currently empty drums that had contained soils remain on-site. The four emptied water drums were removed from the property by Mr. Ouaresma. {A FINDINGS Site Description The subject property consists of approximately three acres of span, vacant land comprising San Joaquin County Assessor's Parcel No. 195-121-30. The property is bounded to the nol(h by a single residence, beyond which are a Texaco automobile service station and rural residential/commercial properties; to the south by East Thomsen Road, beyond which is a commercial office building that was constructed within the past year; to the east by a I residential subdivision; and to the west by Harlan Road, beyond which is the Interstate 5 easement{Plate 2). The current property owners routinely perform mechanical woad abatement: consequently, the ground surface has a disced appearance and during our involvement with the property, s we have observed only sporadic occurrences of, depending on season, Or or dried weeds 6i WALLACE•Kura a £ASSOCIA( S INC.