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".1A 1/Z Q ,9!! J.M.M. <br /> �__�� _ �J <br />. ��___, GROUNDWATER <br /> - --f--___ �___�! TECHNOLOGY INC. <br /> ------- f 4057 Port Chicago Highway,Concord,CA 94520(45)671-2387 <br /> May 20, 1994 FAX:col 5i 685-9148 <br /> Project No. 02010 4239 <br /> Mr. Brett Hunter <br /> Chevron U.S.A. Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> 'i <br /> SUBJECT: Quarterly Monitoring and Sampling Activities <br /> Former Chevron Service Station No. 9-1918 <br /> 45 East Harding Way <br /> Stockton, California <br /> Dear Mr. Hunter: <br /> Groundwater Technology, Inc. presents the quarterly groundwater monitoring and sampling data <br /> collected on April 6, 1994. Ten of the fourteen groundwater monitoring wells were gauged to <br /> determine depth to groundwater (D1W) and to check for the presence of separate-phase petroleum <br /> hydrocarbons. Monitoring wells MW-i, MW-7, and MW-8 were dry. Monitoring wells MW-3, <br /> MW-4, MW-5, and MW-6 are modified for vapor extraction and were not monitored or sampled. <br /> Separate-phase hydrocarbons were not detected in the monitoring wells. A potentiometric surface <br /> map and a summary of groundwater monitoring data are presented in Attachments 1 and.2, <br /> respectively. After measuring DTW, monitoring wells MW-2R, MW-9, MW-10, MW-11, MW-12, <br /> MW-13, and MW-14 were purged and sampled. Groundwater monitoring and sample collection <br /> protocol and field data sheets are presented in Attachment 3. The groundwater samples were <br /> analyzed for benzene, toluene, ethylbenzene, xylenes, and total petroleum hydrocarbons-as- <br /> gasoline. Laboratory reports and chain-of-custody records are included in Attachment 4- <br /> Monitoring well purge water was transported by Groundwater Technology to the Chevron Terminal <br /> in Richmond, California, for.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 /> Written/Submitted by <br /> "I - <br /> Tim Watchers <br /> Project Manager <br /> PR <br /> ,4 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 /> QUA&SR <br /> Offices lhrnuyhoul the U.S.,Canada and Overseas <br />