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Chevron <br /> Chevron U.S.A. Inc. _ <br /> 2410 Camino Ramon, San Ramon, California Phone (510) 842-9500 <br /> Malt Address:P.O.Box 5004,San Ramon,CA 94583-0804 a y <br /> Marketing Department MAR 3 0 1592�E <br /> ENVIRONIfi <br /> EN-1rii- HIM.I H <br /> March 25, 1992 <br /> PERM I��/SEAQ IIU` <br /> Ms. Linda Turkatte <br /> San Joaquin County Environmental Health. <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-6465 <br /> 5608 North Pershing.Avenue, Stockton, CA <br /> Dear Ms. Turkatte: - <br /> Please find attached a report dated February 7, 1992, which.was prepared by Chevron's <br /> consultant, Alton Geoscience(Alton), to describe groundwater monitoring which was performed <br /> • on January 9, 1992, at the site captioned above. <br /> Groundwater gradient direction was consistent with previous observations at the site. <br /> Groundwater samples were collected from all seven groundwater monitoring wells which had <br /> sufficient water, and only one of the samples contained a detectable level of benzene. The sample <br /> from MW-2A contained 1.7 parts per billion (ppb) benzene. <br /> ' n <br /> Because of the consistent lack of significant levels of hydrocarbons in the groundwater beneath this <br /> site, I feel it is appropriate to again-request that your office allow a reduction in the monitoring <br /> frequency. The cost of continued quarterly monitoring does not bear a reasonable relationship to <br /> the minimal benefit to be obtained, as required by the Porter-Cologne Water Quality Control Act. <br /> If you have any questions or comments, you may contact me at(510) 842-8658. <br /> Sincerely, <br /> Clint B.-Rogers <br /> i <br /> Engineer, Site Assessment and Remediation <br /> Attachment <br /> cc: Elizabeth Thayer, Central Valley Regional Water Quality Control Board, Sacramento ,CA <br /> A.G. Spanos Properties, Inc., 1241 W. Robinwood Dr., Stockton, CA 94207 <br /> l <br />