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f } •l <br /> Chevron <br /> Chevron <br /> �i <br /> iji FES n5199yJ,1 �? <br /> ,", Lip DJC Chevron Products Company <br /> February 4, 1997 - 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon CA 94583 <br /> P 0 Box 6004 <br /> Ms Mary Ways San Ramon CA 94583-0904 <br /> San Joaquin County Environmental Health <br /> P O Boa 388 Marketing—Sales West <br /> Stockton CA 95201-038$ <br /> Phone 510 842-9500 <br /> Re Former Chevron Station#9-1918.45 East Hardin Way- Stockton CA <br /> Attached groundwater monitoring report(Blaine Tech, 11/19/96) <br /> Dear Ms Ways <br /> i <br /> Attached you will find a report dated November 19 1996,which was prepared by Chevron's consultant, <br /> Blaine Tech Services Inc (Blaine Tech), to describe the results of groundwater momtonng that was <br /> performed at the subject site on October 24, 1996 <br /> In October, Blaine Tech gauged and sampled all fourteen site-related wells All groundwater samples were <br /> analyzed for the presence of TPHGas,BTEX constituents,and MTBE The measured direction of <br /> groundwater flow was variable Detectable concentrations of dissolved hydrocarbons were measured at <br /> wells MW4,MW-6,MW-9, and MW-13 There were detections of MTBE measured at wells MW-9 and <br /> MW-13 However, further analysis of these detections by EPA Method 8260 only confirmed the detection <br /> at well MW-9(200 ppb) The groundwater results at all other wells were non-detect <br /> There were seven groundwater momtonng wells abandoned dunng November, 1996 There are seven <br /> wells remaining that would continue to be monitored Chevron would like to propose the following <br /> modification to the current monitoring program <br /> Gauge and sample wells MW-3, MW-11, and MW-13 annually (Ist&3rd Qrtrs) <br /> Gauge and sample wells MW-7, MW-10, MW-12,and MW-14 annually (1st Qrtr) <br /> Analyze all samples for TPHG,BTEX,and MTBE <br /> Report annually,after 3rd quarter monitoring event <br /> The proposed program will be implemented as soon as approval is received from your agency If you have <br /> any questions or comments, I can be reached at(510) 842-8695 <br /> I <br /> i <br /> I <br /> Sincerely, <br /> I <br /> Brett L Hunter <br /> Environmental Engineer <br /> �J Site Assessment and Remediation <br /> I <br />