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U. �S Cart Compart,y 35273 Ifruy. 33, Vernalis, California January 3, 1996 Preliminary Site Cham. wlerization Repor4 al'Firidi.ags Page: 2 3.D Scope of Work On November 29, 1995, WHF, Inc , in conjunction with SEMCO, a licensed environmental contractor from Modesto, California, conducted an exploratory trench to approximately nineteen (19) feet b.g.l. The trench was—1 foot wide by 8 feet long by 19 feet deep. Field screening, at various intervals, were accomplished with a poriable Photo-Ionization Detector (PTD) to identify any possible contaminant vapors. The second part of the work was iho rcmoval of the waste pit contents (Figure 2). The pit was primarily used for the disposal of unconsolidated debris and garbage by incineration, as related by a site worker. Prior to trenching, a Scaled site reap Nvas prepared fcfr the location of the Contaminated area(Figure 2). At approximately four to five (4 -5) feet b.g.l., a very strong odor eras detected by the PID. Air monitoring measured background organic vapor levels between 8-19 ppra (parts per million). From approximately seven (7) feet to the base (--19 feet) of ilii: trench, a gFCC11kh-brown color was very visible, suggesting alteration by orgernii. desiccation A.t the fourteen (1+) foot level, a sample was takers, ES-1@14'14' (Table 1); and field scree:ning ineasured 1,340 ppra f-orn the soil in the backhoe bucket. It vas riei cssary tc� i�lc�easa tlr,:: ,.vic[th r.;f t17c trt°c3c:1 lr5 onz.(1)foot. Trenching, was conducted to a maximtun depth of nine„ rn (19) legit b.g.l. At eighteen (18) feet below .a.Erfirce grade, soil screened fi-oni the b u.k:hoe bucket it,,easured 900 ppm. The base of the trench was also screened, in the same manner, and detected 1,300 pprn. The exploratory trench was back filled and connpacted with;Ile pt'uviously Femoved soil. Following the exploratory trench activity, the contents of the waste pit, approximately 36 cubic yards, was removed, placed on and i.xivei-ed with vist_Itucen. TEs was dom; to prevent the contact of waste pit material with the ground. Once all contents vi%,re re,noved and stockpiled, five (5) separate discrete soil samples, cornposited into onr,, were taken from at least two (2) feet of depth in the spoils pile (Table 2). PID field scree►ring was ne °alive. 3.1 Soil Stilirplirrg 9� All soil samples were taken in a l!%" by 6" brass sleeves lion; relatively undisturbed soil, The soil samples were then c c-IL-ctt:cl using a drive haminer sampler and spoon. The laboratory samples did not have any head space and were immediately sealed in their liners using aluminum foil-lined c:ips. They Mitre o0ion labeled and placed in an ice chest cooled with Blue Icco!). The samples were then delive+-ed to the State-certified laboratory, California Laboratory Services, Inc., in Rancho Cordova, C'aliforniLl.