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i <br /> Chevron <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> July 17, 1996 Building L <br /> San.Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms.Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <br /> P.O.Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevron Station#9-4275, 2905 West Benjamin Holt`Drive, Stockton, CA <br /> Attached groundwater monitoring report(Blaine Tech; 4/23/96) <br /> Dear Ms.Meays: <br /> Please find attached_ a report dated,April 23, 1996,which was prepared by Chevron's consultant,Blaine <br /> Tech Services,Inc. (Blaine Tech),to describe the results of groundwater monitoring that was performed at <br /> the subject site on March 18, 1996. <br /> During their March site visit Blaine Tech gauged and sampled all nine wells. All groundwater samples <br /> were analyzed for the presence of TPHGas and BTEX constituents. The measured direction of <br /> groundwater flow was generally toward the north.The measured direction of groundwater flow was <br /> inconsistent with previous site measurements and may have been related to groundwater elevations being <br /> the highest ever measured at the subject site..Dissolved petroleum hydrocarbons were detected at all wells <br /> except,MW-4,MW-7,and MW-9. The measured concentrations were consistent with those detected <br /> previously at the subject site. <br /> I would also like to acknowledge receipt of your letter dated, July 10, 1996, in which you cite several <br /> issues causing Chevron to be out of compliance. The follbwing information is provided to address each <br /> directive in your letter and is numbered correspondingly.- <br /> 1. <br /> orrespondingly.1. Attached to this cover letter is the quarterly groundwater monitoring report issued for the first <br /> quarter, 1996. The Blaine Tech Services,Inc. report dated,January 9, 1996,presents monitoring <br /> results for the fourth quarter, 1995 and is also being provided in this transmittal. The second quarter, <br /> 1996 monitoring event occurred on June 18, 1996. The report documenting those results will be <br /> submitted to your agency by August 9, 1996. <br /> 2. A review/update of the current compliance schedule indicates that the drilling permit, amended site <br /> map and health and safety plan were submitted January 5, 1996. The permit application to the <br /> SJVUAPCD was submitted on January 81 1996 (permit issued: 4/4/96). The other activities listed in <br /> the current compliance schedule have not been initiated. As.such, Chevron and Geraghty&Miller <br /> would like to`request the following modifications to the current schedule: - <br />