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`s. Ui;i3�i4�4f�i., 11tIiI_� ron Chevron <br /> 7 _{5jt `F �1` �ilk <br /> I F i�F <br /> 920WT29 PN (• 37 <br /> Chevron U S A Products Company <br /> 2410 Camtno Ramon <br /> October 25, 1993 San Ramon CA 94583 <br /> PO Box 5004 <br /> San Ramon GA 94583 0804 <br /> Marketing Department <br /> Ms Margaret Lagono Phone 510 842 9500 <br /> San Joaquin County Environmental Health <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Re Former Chevron Station#9-5075A 2400 At rt WaStockton CA <br /> Attached groundwater monitoring report(GTI, 5114193) <br /> Attached groundwater monitoring report(GTI,917193) <br /> Attached groundwater sample chain of custody document (GTI, 1124191) <br /> Dear Ms Lagono <br /> Attached are reports dated May 14, 1993 and September 7, 1993, which were prepared by <br /> Chevron's consultant, Groundwater Technology Inc (GTI), to describe groundwater monitoring <br /> performed at the subject site on April 13, 1993 and July 22, 1993 <br /> The measured direction of groundwater gradient during the May site visit was toward the east <br /> Groundwater samples were collected from all four site monitoring wells and analyzed for the <br /> presence of TPHGas and BTEX constituents No dissolved hydrocarbons were present above the <br /> method detection limits <br /> The measured direction of groundwater flow during GTI's July site visit was toward the northeast <br /> Monitoring wells MW-1, -2, and MW-3 were sampled and analyzed for the presence of TPHGas <br /> and BTEX constituents Dissolved hydrocarbons were not detected in these wells The wellhead at <br /> monitoring well MW-4 was found to be damaged therefore, this well was not sampled <br /> As requested by the letter from San Joaquin County dated May 21, 1992, I have attached a copy of <br /> the chain of custody document which accompanied groundwater samples from monitoring well <br /> MW-4 during sampling on January 24, 1991 This document was inadvertently omitted from <br /> GTI's well installation report dated February 22, 1991 <br /> If you have any questions or comments, I can be reached at(510) 842-8695 <br /> Sincerely, <br /> Brett L Hunter <br /> 10 Environmental Engineer <br /> Site Assessment and Remediation <br /> l <br />