ARCHIVED REPORTS_HUMAN HEALTH SCREENING SUPPORTING DOCUMENTS

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Hunter Container Corporation 35275 Hivy. 33, Vernalis, California April 23, 1996 Phase Z-Site Characterization (WastelBurn Pit) Page: 4 during this study and located, as they are shown on Figure 2, to target these areas of contaminatioin previously identified in ERM's study. A 2.5 foot b.g.l. soil sample was not taken where ERM conducted the S-6 sample. This is primarily because this area will be included in a seperate, and already scheduled, phase of work and reported seperately. rConfirmation of ERM's samples S-3, 7, 9 and 11 could not be accomplished by hand augering because at approximately one (1) to one half(V-2) foot b.g.l., asphalt pavement was encountered. After an extended period of field time, the augering tool finally penetrated the asphalt pavement layer and in tura encountered another asphalt layer approximately 1-2 inches below the prior one. Sampling in this area was terminated. This boundary/barrier is by no means a aquifuge, but will act as an aquiclude for vertical contaminant mobility/migration of soluble contaminants. Furthermore, ERM's samples taken in this area tested very low to minimal levels of Lead (Table 3). No detections of any other analytes, except for 35 mg/kg Lead and 310 ug/kg Toluene in sample "S-7" were noted. 4.0 Conchisions '.' 4.1 Waste/Burn Pit Relatively high contamination levels of Lead were identified in the spoils pile from the waste/bum pit. The spoils pile, approximately 29.86 tons, was transported off-site on March 18, 1996, to Chemical Waste Management, Inc., an approved Class I hazardous waste facility, located on 35251 Old Skyline Road, in Kettleman City, California. Rich Hamilton Trucking, a DOT certified hazardous waste trucking company, transported all soil off the subject site property under manifest documents 95903732 and 95903732, as referenced in Appendix C. 4.2 Surrounding Area All surface samples taken at 2.5 feet b.g.l. showed no evidence of contamination except for the presence of Motor Oil detected in RB-1, 2 & 3, and RB-5. It is shown, by the work accomplished in this report, that the previous surface sampling event by ERM, Inc., in April of 1995, indicated that levels of contamination were significantly elevated. Although, below surface grade contaminants were, representatively, shown to be non detectable, except for very low concentrations of Motor Oil. The detections of Motor Oil are residual, less than 100 mg/kg (Maximum Contaminant Level "MCL" < 100 mg/kg), and thus, posses minimal, if no, risk for the environmental conditions at this site. 3