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Chevmn <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon, San Ramon, California• Phone (510) 842-9500 <br /> Mail AddressP.O.Box 5004,San Ramon,CA 94583-0804 <br /> Marketing Department - nee; <br /> January 21, 1992 JAN 2 7 1992 <br /> ENVIROiVP,r:EWAL HEALTH <br /> PERMIT/SERV CES <br /> Ms. Mary Meays <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron Station#9-1918 <br /> 45 East Harding Way, Stockton, CA <br /> Dear Ms.Meays: <br /> Enclosed is a work plan dated January 8, 1992, which was prepared by Chevron's consultant, <br /> Groundwater Technology Inc. (GTI), to describe the proposed installation of four groundwater <br /> monitoring wells and one vadose extraction well at the site captioned above. The four monitoring <br /> wells are proposed to help evaluate the extent of hydrocarbons in the groundwater, and the <br /> extraction well is planned to aid in the removal of hydrocarbons from the subsurface. The work <br /> plan is submitted for your review. Upon your approval of the plan, GTI will seek the necessary <br /> permits and schedule the work. <br /> I have received a letter from San Joaquin County(SJC) dated January 6, 1992 regarding this site. <br /> Below I have responded to each of the comments in that letter. <br /> The first item concerned the failure to notify SJC prior to the October 23, 1991 groundwater <br /> sampling event. I apologize for this oversight. I have instructed Chevron's consultant, EA <br /> Engineering, to notify SJC at least 48 hours prior to future groundwater sampling events. In <br /> addition, I have instructed GTI to notify SJC at least 48 hours prior to the commencement of the <br /> proposed drilling activities outlined in the enclosed work plan. <br /> The second item dealt with the date for submitting the enclosed work plan. Wbile it is correct that <br /> the work plan had originally been requested by November 17, 1 would like to point out that you <br /> twice agreed (in phone conversations with Chevron's consultant, GTI, on November 19 and <br /> December 13) to extend this deadline. GTI had requested an extension to the deadline in order to <br /> obtain and review documents concerning hydrocarbon investigations at other service station sites <br /> nearby. Obtaining the documents took longer than expected due to the scheduling of the record <br /> search by SJC. <br /> The third and final item of SJC's January 6 letter dealt with the use of wells V 1, V2, V4, MW4, <br /> MWS, and MW6 for vapor extraction purposes. Because of the extremely low concentrations of <br /> hydrocarbon vapors which have been regularly measured in these wells, the wells have been <br /> utilized for the inlet of air as opposed to the extraction of air: <br />