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5 0 RESULTS OF ADDITIONAL. SITE ASSESSMENT 51 Scope of Work On November 1 and 2, 2004, SECOR supervised the drilling of three on-site soil borings (SB- 12, SB-13, and SB-14) in the vicinity of the source area (former USTs) at the locations shown on Figure 2 Drilling activities were performed by Gregg Drilling and Testing, Inc of Martinez, California The completed scope of work is summarized below • Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR prepared a site-specific Health and Safety Plan (HASP) Prior to the commencement of fieldwork, the HASP was updated with appropriate field personnel and subcontractor information The field staff and contractors reviewed the HASP before beginning field operations at the site O Permits A permit for drilling the soil borings was obtained from the SJCEHD prior to the commencement of fieldwork activities A copy of the permit is included in Appendix G • Borehole Clearance Activities At least 48 hours prior to the commencement of drilling, Underground Services Alert (USA) was contacted to identify the presence of utilities in the vicinity of the proposed well locations Borehole advancement activities were initiated after the absence of utilities was verified by USA and Cruz Brothers, a utility locator • Post-Remediation Confirmation Soil Borings Two 6-inch diameter soil borings (SB- 12 and SB-13) were advanced to a depth of 40 5 feet bgs and one 6-inch diameter soil boring (SB-14) was drilled to a depth of 80 5 feet bgs using a hollow stem auger drill rig Soil samples for soil stratigraphic assessment and possible chemical analysis were collected at 5-foot intervals using a California-modified split-spoon sampler Field and laboratory procedures are included in Appendix H Boring details are presented in Table 1, and are included on logs in Appendix C o Soil Analytical Results Soil samples collected from depths at which historical detections of petroleum hydrocarbons had been observed were submitted to Excelchem Environmental Labs (Excelchem) for analysis of TPHg by Environmental Protection Agency (EPA) Method 8015M Soil samples were additionally analyzed for the presence of benzene, toluene, ethylbenzene, total xylenes (BTEX), fuel oxygenates methyl tert- butyl ether (MtBE), tert-butanol (TBA), di-isopropyl ether (DIPS), ethyl tert-butyl ether (EtBE), tert-amyl methyl ether (TAME), and lead scavengers 1,2-dichloroethane (1,2- DCA) and ethylene dibromide (EDB) by EPA Method 8260B Soil analytical results are Included in Table 2 The certified laboratory analytical report and chain-of-custody documentation are presented in Appendix I Time Oil Asmt&SCM doc 8 March 17 2005 770T 41 658 00 0015