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Mr. Bruce Dickerman <br /> May 21, 1991 <br /> Page 3 <br /> For the purposes of this proposal, we estimate that one soil sample from each boring, <br /> showing the highest HNu reading will be analyzed for TPH/G and benzene, ethyl benzene, <br /> toluene and xylene (BETX) using Modified EPA Methods 8015 and 8020, respectively. If <br /> significant soil contamination is encountered in a borehole, the sample showing the highest <br /> HNu reading and the first sample encountered below the zone of apparent soil <br /> contamination may be analyzed. <br /> Data Analysis and Reporting <br /> A report will be prepared after laboratory analyses have been received and evaluated. The <br /> report will describe the field work conducted at the site, soil conditions, and analytical <br /> results. The report will include necessary supporting materials and graphics including: a site <br /> plan, permit copies, boring logs, laboratory reports, and chain-of-custody sheets. <br /> The results of the environmental assessment will be used to assess the potential for <br /> significant soil contamination. Due to the presence of the doughnut shop over the majority <br /> of the former service station, it may not be possible at this time to determine the vertical <br /> and lateral extent of potential soil contaminants. Our conclusions regarding the presence <br /> and estimated extent of potential soil contaminants will be presented in the final report <br /> along with our recommendations for additional assessment, if warranted. <br /> SCHEDULE <br /> This supplemental assessment can be completed within approximately five to six weeks from <br /> the workplan approval. Boring permit applications will be submitted with the workplan. <br /> Field preparations, field work and laboratory analyses will take about three weeks to <br /> complete. A draft report can be submitted for review within approximately two weeks of <br /> our receipt of laboratory analytical results. <br /> If you have any questions or need additional information, please contact Mr..Mark Miller <br /> at (415) 499-1422. <br /> Sincerely, <br /> 4 <br /> Mark I. Miller, C.E.G. 1540 Thomas C. Holmes, R.G. 4693 <br /> Senior Environmental Geologist Principal <br />