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f , <br /> Chevron <br /> a Chevron <br /> • <br /> Chevron Products Company <br /> February 28, 1997 6001 Bollinger Canyon Road <br /> Budding L <br /> San Ramon CA 94583 <br /> P 0 Box 6004 <br /> San Ramon CA 94583 0904 <br /> Mr Harlin Knoll West <br /> Sales g Marketin — les <br /> San Joaquin County Environmental Health Phone tin 9les <br /> P O Box 388 <br /> 500 <br /> Stockton, CA 95201-0388 <br /> Re Former Chevron Station# 9-0342, 1347 S El Dorado Street, Stockton, CA <br /> Attached groundwater monitoring report(Blaine Tech, 12/18/96) <br /> Dear Mr Knoll <br /> Attached you will find a report dated December 18, 1996,which was prepared by Chevron's consultant, <br /> Blaine Tech Services, Inc (Blaine Tech),to describe the results of groundwater monitoring that was <br /> performed at the subject site on November 26 1996 <br /> During the November monitoring event Blaine Tech gauged all three site-related wells and sampled wells <br /> . MW-3 and MW-4 Well MW-2 is sampled sena-annually The measured direction of groundwater flow <br /> was northeasterly This was consistent with historic trends Samples from both wells were analyzed for the <br /> presence of TPHGas, BTEX constituents, and MTBE There were no dissolved petroleum hydrocarbons or <br /> MTBE detected <br /> A review of current groundwater conditions reveals that all three site-related wells have screen intervals <br /> that are submerged These conditions have existed at wells MW-2 and MW-3 since 1995 and at well MW- <br /> 4 since 1996 Analytical results collected during the submerged screen period may not accurately <br /> represent groundwater conditions However, a review of groundwater data collected prior to the well <br /> screens becoming submerged indicate several noticeable trends For example, the prominent direction of <br /> groundwater flow was toward the northeast Dissolved hydrocarbon concentrations at each well (including <br /> MW-1) exhibited decreasing and/or non-detect levels There did not appear to be any extensive plume of <br /> contamination remaming to groundwater This is particularly significant in the case of well MW-3 which <br /> is located closest to and downgradient from the most probable hydrocarbon source area <br /> Considering the above information, Chevron recommends that the subject site be considered for case <br /> closure To facilitate this consideration, Chevron wtll instruct its consultant to prepare a closure summary <br /> report for your agency's review The anticipated date of report subimttal is on or before April 15 1997 In <br /> the meantime, all further groundwater monitoring will be suspended <br /> If you have any questions or comments 1 can be reached at (510) 842-8695 <br /> Sincerely, <br /> Brett L Hunter <br /> .� Environmental Engineer <br /> Site Assessment and Remediation <br /> E �� <br />