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Ms. Kaite Hower GEOMATRIX Chevron Pipe Line Company 11 December 1996 Page 2 5502E and 5502F, respectively. Analytical results are summarized in Table 1. Low concentrations (20 to 170 milligrams per kilogram [mg/kg]) of TOG and TRPH were detected in the samples collected from locations A, C, and H. Higher concentrations (890 to 1600 mg/kg) of TOG and TRPH were detected in the sample collected from location E. Measurements of TOG and TRPH are known to be inconclusive as to the presence and/or concentrations of petroleum hydrocarbons. Scope of Additional Assessment Based on the results of the previous assessment and as described in the work plan, additional assessment was performed at location E to confirm whether the concentrations of TOG and TRPH previously reported at this location are attributable to the crude/Bunker C oil carried in the former pipelines and to evaluate the vertical extent of crude/Bunker C oil in soil, if present. The assessment consisted of drilling one soil boring (SB-1) to a depth of 15 feet below ground surface (bgs) at location E and collecting soil samples for laboratory analysis. Field activities were performed on 19 September 1996. Soil sampling services were provided by Precision Sampling, Inc. of San Rafael, California. The soil boring was continuously sampled using a push-core system and was advanced to a depth of 15 feet bgs. Soil samples were retained for lithologic logging, field screening, and laboratory analysis from depths of 4 feet, 10 feet, and 15 feet bgs. Soil samples were logged using visual/manual procedures described in the American Society for Testing and Materials method D 2488-90. The lithologic log is included in Appendix A. Field screening consisted of observing soil samples for visual evidence (discoloration) and olfactory evidence (odor) of petroleum hydrocarbons and measuring volatile organic compounds in headspace above the samples using an organic vapor meter. Field screening results were recorded on the lithologic log at the appropriate depth. Samples retained for laboratory analysis were removed from the sampler, sealed with Teflon@O sheeting , plastic caps, and non-adhesive tape, labeled, and placed in an ice-cooled chest for transport to the laboratory using chain-of-custody procedures. Laboratory services were provided by American Environmental Network (AEN) in Pleasant Hill, California. Analytical data sheets provided by AEN are included in Appendix B. The work plan called for analysis of the soil samples for fingerprint characterization by gas chromatography (GC) to evaluate the type of petroleum hydrocarbon present, if any. If the petroleum hydrocarbons were present, and could be attributed to crude/Bunker C oil carried in the former pipeline, the samples were to be analyzed for total extractable hydrocarbons quantified as crude oil (TEH-C); benzene, toluene, ethylbenzene, and xylenes (BTEX); and polycyclic aromatic hydrocarbons (PAHs). [APROJECINC34 3499-17.DOC