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Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon.CA 94583 <br /> P.O.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> October 11, 1995 <br /> Martrating—Northwest Rapion <br /> Phone 510 842 9500 <br /> Mary Meays <br /> San Joaquin County Public Health Services <br /> P. O.Box 388 <br /> Stockton,CA 95201-0388 <br /> Re: Former Signal Oil##221-5,5431 Grantline Road.Hants CA <br /> Attached Request For Site Closure(GTI,9/22/95) <br /> Dear Ms. Meays: <br /> Attached you will find a report dated September 22, 1995,which was prepared by Chevron's consultant, <br /> Groundwater Technology Inc. (GTI),to discuss the results from ali previous environmental investigations <br /> and to formally request case closure. <br /> During their review of data from previous investigations,GTI concluded that adequate investigation has <br /> been performed at the subject site.The petroleum hydrocarbons remaining in soil near the former UST <br /> complex have been fully defined and are minimal in mass. Results of groundwater monitoring performed <br /> over one full hydrologic cycle have demonstrated that there are no leachable components remaining in the <br /> residual hydrocarbon mass. Consequently,GTI and Chevron both feel that the site specific conditions <br /> support case closure.Hopefully, San Joaquin County Public Health Services will concur. <br /> Chevron is prepared to begin permitting for the proper abandonment of the monitoring wells onsite as <br /> soon as approval of case closure is received from your agency. Until that time,future groundwater <br /> monitoring will be suspended <br /> If you have any questions or comments,you may contact Jason Fedota of GTI at(916)372-4700,or <br /> myself at(510)842-8695. <br /> Sincerely, <br /> Brett L.Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />