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U. S Can Company 35275 Hwy. 33, Vernalis, California January 3, 1995 Preliminary Site Characterization Repor:of Findings Page: 2 3.0 Scope of Mork On November 29, 1995, NAgU, Inc., in conjunction with SEMCQ, 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 portable Photo-Ionization Detector (PID) to identify any possible contaminant vapors. The second part of the work was the removal 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 map was prepared for the location of the contaminated area(Figure 2). At approximately four to five (4 -5) feet b.g.l., a very strong odor was detected by the PID. Air monitoring measured background organic vapor levels between 8-18 ppm (parts per million). From approximately seven (7) feet to the base (-19 feet) of the trench, a greenish-brown color was very visible, suggesting alteration, by organic desiccation. At the fourteen (14) foot level, a sample was taken, ES-1@14' (Table 1), and field screening ineasured 1,341 ppm from the soil in the backhoe bucket. It was necessary to increase theavidth of the trent is by one(1) foot. Trenc}L,ig was conducted to a maximum depth of'nineieen (.1.9)feet b.g.l. At eighteen (18)feet below surface grade, soil screened from the backhoe bucket measured 900 ppm. The base of the trench was also screened, in the same mariner, and detected 1,300 ppm. The exploratory trench was bast;filled and compacted with the preAously removed soil. Following the exploratory trench activity, the contents of the waste pit, approximately 36 cubic yards, was removed, placed on and covered with visqueen. This was done to prevent the contact of waste pit material with the ground. 'Once all contents were removed and stockpiled, five (5) separate discrete soil samples, composited into rine, were taker from at least two (2) feet of depth in the spoils pile (Table 2). PID field screening was negative. 3.1 Soil Sampling All soil samples were taken in a 11/7" by 6" brass sleeves from relatively undisturbed soil. The soil samples were then collected using a drive hammer sampler and spoon. The laboratory samples did not have any head space and were immediately sealed in their liners using aluminum foil-lined caps. They were then labeled and placed in an ice chest cooled with Blue IceO. The samples were then delivered to the State-certified laboratory, California Laboratory Services,Inc., in Rancho Cordova, California.