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i <br /> Chevron <br /> Chevron U S A Inc <br /> 2410 Camino Ramon, San Ramon, California• Phone (5101842-9500 <br />• Mad Address PO Box 5004 San Ramon CA 94583 0804 MAR <br /> '34 <br /> �� 1I 66'4 �� <br /> Marketing Department ENVIRONAtrr <br /> March 24, 1992 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Re Former Chevron Station# 9-0342 <br /> 1347 S El Dorado Street, Stockton, CA <br /> Dear Mr Knoll <br /> Please find attached a report dated February 18, 1992, which was prepared by Chevron's <br /> consultant, Groundwater Technology Inc (GTI), to describe first quarter groundwater monitoring <br /> performed on January 14, 1992, at the site captioned above The gradient, to the northeast, is <br /> consistent with prevtous findings No hydrocarbons were detected in samples from wells MW-1, <br /> MW-2, and MW-4 Low levels of dissolved hydrocarbons were detected in MW-3 <br />• Due to the consistency of the groundwater monitoring data collected over the last six quarters, the <br /> low level of dissolved hydrocarbons, and the indications that groundwater is not impacted offsite, I <br /> would like to ask you to consider reducing the required frequency of groundwater monitoring <br /> Rather than a continued quarterly frequency, I feel that an annual or semi-annual frequency would <br /> be more appropriate for this site <br /> GTI is currently scheduled to monitor the site again in the second quarter of 1992 I've asked GTI <br /> to not schedule this site until after May 1 If you could call me or send me a letter responding to <br /> this request before this date, then I will be able to instruct GTI of your decision prior to the next <br /> scheduled monitoring event <br /> Thank you for your consideration of this request I'll look forward to hearing from you If you <br /> have any questions or comments, I can be reached at(510) 842-8658 <br /> Sincerely, <br /> Clint B Rogers <br /> Engineer, Site Assessment and Remediation <br /> Attachment <br /> cc Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Ramon Guerrero, 1327 S Wilson Way, Stockton, CA 95205 <br /> Jim Grasty, GTI, West Sacramento, CA (w/o enclosure) <br />