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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 /> na <br /> r fi� February 21, 1992e � <br /> F E B 24 1992 <br /> Ms. Linda Turkatte FRS f i �'�L HEALTH <br /> San Joaquin County Environmental Health t > �l�'` ' ` <br /> P.O. Box 2009 PEIiMi1J'SER 1ICES <br /> Stockton, CA 95201 <br /> Re: Chevron Station # 9-6465 <br /> 5608 North Pershing Avenue, Stockton, CA <br /> Dear Ms. Turkatte: <br /> Enclosed is a Corrective Action Plan (CAP) .dated February 20, 1992, which was prepared by <br /> Chevron's consultant, Groundwater Technology Inc. (GTI), as requested in your letter to Chevron <br /> dated December 27, 1991, regarding the site captioned above. The CAP follows the guidelines of <br /> Article 11, Chapter 16 of the State of California Underground Storage Tank Regulations. <br /> As requested in your letter, the CAP proposes three alternative future actions for the site, thdse being <br /> verification monitoring, excavation of hydrocarbon 'impacted soil,. and vapor extraction of <br /> hydrocarbon impacted soil. Chevron has.chosen the verification monitoring alternative based upon <br /> site conditions, technical data, feasibility, efficiency, and cost effectiveness. <br /> The excavation and vapor extraction alternatives were discounted based upon the corrective actions <br /> which took place in 1988 (the removal of hydrocarbon impacted soil from' around and' beneath <br /> product delivery lines) and 1990 (the replacement of damaged well heads), based upon the results of <br /> site investigations in 1988 and 1990 (no detectable hydrocarbon impacted soils), and based upon <br /> recent groundwater monitoring results (very minimal or no detectable levels of dissolved <br /> hydrocarbons in the groundwater). The technical data collected regarding the site conditions do not <br /> indicate that any significant levels of hydrocarbons are present in.the-soil or groundwater, therefore it <br /> would not be feasible to excavate or vapor extract. Rather Chevron proposes the more reasonable <br /> alternative of groundwater monitoring to further verify that no significant degradation of <br /> groundwater quality has occurred. <br /> If you have any questions or comments, I can be.reached at (510) 842-8658. <br /> Sincerely, <br /> i <br /> Clint B. Rogers <br /> Engineer, Site Assessment and Remediation <br /> Enclosure r <br /> cc: Elizabeth Thayer, Central Valley Regional Water Quality Control Board, Sacramento ,CA <br /> A.G. Spans Properties, Inc., 1241 W. Robinwood Dr., Stockton, CA 94207 <br /> Jim Grasty, GTI, Sacramento, CA (w/o enclosure) <br /> i <br />