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Hunter Container Corporation
<br /> 35275 Htivy. 33, Vernalis, California April 23, 1996
<br /> Phase Z-Site Characterization (WastelBurn Pit) Page: 2
<br /> contamination (Figure 2). Contamination was identified and confirmed in all four (4) of the
<br /> hand borings.
<br /> Concentrations of Ethylbenzene and Trichloroethylene(TCE) were detected in sample BB-3 at
<br /> varying depths of four (4), six (6), eight (8) and ten (10) feet b.g.l. Samples from HB-4 had
<br /> detectable concentrations of Ethylbenzene and TCE at eight (8) feet b.g.l. and Benzene,
<br /> Toluene, and Xylene at eight (8) and ten (10) feet b.g.l. All analytes were discovered to have
<br /> levels of contamination as none detectable for the BB-5 samples. HB-6 also had
<br /> concentrations of Ethylbenzene, TCE, Benzene, Toluene, and Xylenes at 6, 8, and 10 feet b.g.l.
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<br /> { 3.0 Scope of Work
<br /> :i
<br /> On November 29, 1995, Vaff Inc., in conjunction with SEMCO, a licensed environmental
<br /> contractor,from Modesto, California, removed the contents of the wastelbum pit, a concreted
<br /> cell (Figure 2). Approximately`29.86 tons(Appendix C) of soil was removed from the bum pit
<br /> and placed on andcovered-wi- visqueen. This was done to prevent the contact of burn pit
<br /> material with the ground surface. The burn pit was primarily used for the disposal of
<br /> unconsolidated debris and garbage by incineration, as informed by a site worker. Once all
<br /> contents were removed and stockpiled, four (4) seperate discrete soil samples, composited into
<br /> one, were taken on February 16, 1996, from at least two (2) feet in depth into the spoils pile
<br /> (Table 1, Appendix A),
<br /> On March 6, 1996, WHF, Inc., conducted six (6) hand borings, RB-1 through RB-6 (Figure
<br /> 2), to an approximate depth of 2.5 feet b.g.l. in the same area where contamination was
<br /> previously identified in ERNI°s report dated April 15, 1995. Samples were taken at a deeper
<br /> depth, 2.5 feet instead of off the top surface of the soil. This was accomplished to investigate
<br /> and identify contamination posses an impact to the environmental conditions at the site.
<br /> 3.1 Soil Sampling
<br /> Soil samples, associated with the burn/waste pit, were taken in I'/z" by 6" brass sleeves
<br /> from at least two (2) feet into the spoils pUe. All surface samples were conducted in
<br /> the same manner except to a depth of approximately 2.5 feet b.g.l. The soil samples
<br /> were then collected Using a drive hammer sampler and spoon. The laboratory samples
<br /> did not have any head space and were immediately sealed in their liners using aluminum
<br /> foil-lined caps. They were then labeled and placed in an ice chest cooled with Blue
<br /> Ice& The samples were then delivered to the State-certified laboratory, California
<br /> Laboratory Services, Inc., in Rancho Cordova, California.
<br /> 3.2 Requested Analyses
<br /> • The composited sample, CPS-2-(1, 2, 3, & 4), was collected for laboratory analysis
<br /> and analyzed using EPA method 6010/7000 for TTLC and STLC CAM Metals (Table
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