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Ms. Katie L. How <br /> ' er <br /> Chevron Pipe Line Company GEOMATRIX <br /> 13 February 1997 <br /> ' Page 2 <br /> headspace above the samples using an organic vapor meter. Field screening results were recorded at <br /> the appropriate depth on the lithologic logs. Soil samples collected for chemical analysis were removed <br /> from the sampler, sealed with Teflon® sheeting, plastic lids, and non-adhesive tape, labeled, and placed <br /> in an ice-cooled chest for subsequent delivery to the laboratory using chain-of-custody procedures. <br /> Soil samples were retained for chemical analysis from each boring at <br /> P y b depths of 0.5 to 1.0, 2.0 to 2.5, 5.0 <br /> ' to 5.5, and 8.0 to 8.5 feet bgs. With the exception of samples collected from 0.5 to 1.0 feet bgs, the <br /> samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA <br /> Method 8020 and for polycyclic aromatic hydrocarbons (PAHs) using EPA Method 8310. The 0.5- to <br /> ' 1.0-foot samples were analyzed for PAHs only. Laboratory services were provided by American <br /> Environmental Network of Pleasant Hill, California. Analytical data sheets provided by the laboratory <br /> are included in Appendix B. <br /> The results of the laboratory analysis indicate that BTEX were not present at or above the method <br /> ' detection limit in any of the samples analyzed. PAHs were detected in only one of the eight samples <br /> analyzed. The PAHs benzo(a)anthracene and pyrene were detected at concentrations of 0.25 and <br /> 1.6 milligrams per kilogram (mg/kg), respectively, in the sample collected from SB-1 at a depth of 2 to <br /> ' 2.5 feet bgs. The concentrations of these constituents are below the U.S. EPA Region IX Preliminary <br /> Remediation Goals (PRGs) (August 1996) for residential soil of 0.61 mg/kg for benzo(a)anthracene and <br /> 100 mg/kg for pyrene. Based on a comparison to the PRGs, the detected concentrations of <br /> benzo(a)anthracene and pyrene pose no unacceptable health risk for a residential scenario. <br /> ' Please call if you have any questions. <br /> ' Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> 1 J erson CDawn A. Zemo, C. E. G. <br /> e r,! eological Engineer Principal Hydrogeologist <br /> Attachments: Figure 1 -Location Map <br /> Figure 2- Site Plan <br /> Appendix A-Lithologic Logs <br /> Appendix B -Analytical Data Sheets <br /> ' cc: Connie Peak, CPL <br /> ' lip)1\PROJECTNO769\3769-2.1DOC <br />