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cho"Vilf-bb <br /> September 24, 1996 TS, SEP 26 Ali 11, 12 <br /> Chevron Real Estate <br /> Management Company <br /> Mr. Harlin Knoll A Division of Chevron U.S.A.Inc. <br /> 225 Bush Street <br /> San Joaquin County Environmental Health Division San Francisco,CA 94104 <br /> Environmental Services Division <br /> 304 - E. Weber Avenue <br /> Stockton, California 95202 <br /> SUBJECT: SESOIL Model Results <br /> 540 -N. Aurora Way/ 969 E. Fremont Street <br /> Stockton, California 95202 <br /> Dear Mr. Knoll: <br /> Enclosed is the SESOIL Model Results Memorandum dated August 21, 1996 as prepared <br /> by Curt Peck of Chevron Research & Technology Company. The memorandum discusses <br /> the results of the SESOIL Model under the conservative assumptions and input <br /> parameters as discussed and directed by your agency. With the conservative assumptions <br /> and input parameters the model results indicate that benzene detected in soil sample S13-8 <br /> at 35' (0.052 ppm benzene) would migrate to the groundwater and result in 3 ppb benzene <br /> concentration. However, the historical groundwater monitoring data between 517191 to <br /> 11/17/95 indicates the benzene concentrations have been at or below 1.0 ppb. <br /> Currently all four groundwater monitoring wells on site have indicated benzene <br /> concentrations below 1.0 ppb. The current and historical groundwater concentrations are <br /> less than the modeled SESOIL results and would indicate that the residual soil <br /> concentration in soil sample S13-8 at 35' (0.052 ppm benzene) does not pose a significant <br /> threat to the groundwater beneath the site. Based upon the historical groundwater data, I <br /> would like to request a review for case closure for this site. A response from your agency <br /> by October 9, 1996 would be appreciated. <br /> If you have any further questions or comments, please feel free to contact me at (415) <br /> 894-5137. Thank you. <br /> Sincerely, <br /> vv <br /> Cynz is Wong <br /> Project Engineer <br /> Enclosure <br /> �f.l ieh�F <br />