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- - GROUNDWATER <br /> TECHNOLOGY INC. 4057 Port Chicago Highway,Concord CA 94520 415 671-2387 <br /> FAX (415)685-91.48 <br /> June 17, 1994 Project No 02010 3984 <br /> Mr Brett Hunter <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> SUBJECT Quarterly Monitoring and Sampling Actwotres <br /> Former Chevron Service Station No 9-0342 <br /> 1347 South EI Dorado Street <br /> Stockton, California <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc presents the quarterly groundwater monitoring and sampling data <br /> collected on May 25, 1994 Two of four groundwater monitoring wells were gauged to determine <br /> depth to groundwater (DTW) and to check for the presence of separate-phase petroleum <br /> hydrocarbons Separate-phase hydrocarbons were not detected in the monitoring wells Monitoring <br /> well MW-11 has a building constructed over it Monitoring well MW-3 is paved over and could not be <br /> located A potentiometric surface map and a summary of groundwater monitoring data are <br /> presented in Attachments 1 and 2, respectively After measuring DTW, the monitoring well MW-4 <br /> was purged and sampled Monitoring wells MW-1 and MW-2 are semi-annual and not to be <br /> sampled this quarter Groundwater monitoring and sample-collection protocol, and field data sheets <br /> are presented in Attachment 3 The groundwater samples were analyzed for benzene, toluene, <br /> ethylbenzene, xylenes, and total petroleum hydrocarbons-as-gasoline Laboratory reports and <br /> chain-of-custody records are included in Attachment 4 Monitoring well purge water was <br /> transported by Groundwater Technology to the Chevron Terminal in Richmond, California, for <br /> recycling <br /> Groundwater Technology, Inc is pleased to assist Chevron on this project If you have any <br /> questions or comments please call our Concord office at (510) 671-2387 <br /> Sincerely, <br /> Groundwater Technology, Inc. <br /> Wntt ubmitte <br /> Kenneth P Jo son <br /> PR � Project Manager <br /> � <br />. Attachment 1 Figure For <br /> Attachment 2 Table Wendell W Lattz <br /> Attachment 3 Protocol and Field Data Sheets Vice President, General Manager <br /> Attachment 4 Laboratory Report West Region <br /> QM&SR <br /> Offices throughout the US Canada and Overseas <br />