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w- /w <br /> Chevron <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon,San Ramon, California•Phone (510) 842-9500 <br /> Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 <br /> Marketing Department <br /> February 27, 1992 � <br /> 07 <br /> Ms. Margaret Lagorio MAR 2 1992 <br /> San Joaquin County Environmental Health ENVIR ONMEN'i`Ay, H WALTH <br /> P.O. Box 2009 PERM IT/SERVICE5 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-4275 <br /> 2905 West Benjamin Holt Drive, Stockton, CA <br /> Dear Ms. Lagorio:. <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 performed on January <br /> 15, 1992, at the site captioned above. The hydraulic gradient direction and the levels of dissolved <br /> hydrocarbons in the groundwater samples were consistent with previous observations at this site. <br /> Chevron's consultant, Groundwater Technology Inc. (GTI),, has scheduled the drilling of two <br /> groundwater monitoring wells and one vadose zone well for March 3, 1992. A report of the <br /> investigation will be submitted to your office by April 15,:1992 as agreed upon. In the report, GTI <br /> will include a potentiometric surface contour map depicting the elevations of groundwater in <br /> vicinity wells belonging to both Chevron and ARCO. GTI will -coordinate the groundwater <br /> elevation measurements With ARCO's consultant, Brown and Caldwell (BC). In addition, in an <br /> attempt to satisfy your request of a city well sampling plan by March 31, 1992, GTI will contact <br /> BC to coordinate this activity. <br /> If you have any questions or comments, I may be reached at(510) 842-8658. <br /> Sincerely, <br /> � Clint B. Rogers ; <br /> Engineer, Site Assessment and Remediation. <br /> 4 <br /> Attachment <br /> cc: Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Chuck Carmel, ARCO Products Co., P.O.,Box 5811, San Mateo, CA 94402 <br /> Steve Misner, Brown and Caldwell, 723 S St., Sacramento, CA 95814-7092 <br /> Jim Grasty, GTI, West Sacramento, CA - <br /> John DeGeorge,Alton, Pleasanton, CA (W/o attachment) <br /> r � <br />