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GROUNDWATER <br /> NDWATER <br /> TECHNOLOGY, INC. Highway,Concord,CA 94520(415)671-2387 <br /> -.-- 4057 Port Chicago <br /> FAX:(415)685-9148 <br /> March 25, 1994 Project No. 02010 3983 <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 Activities <br /> Chevron Service Station No. 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Dear Mr. Hunter: <br /> Groundwater Technology, Inc. presents the quarterly groundwater monitoring and sampling data <br /> collected on February 9, 1994. Sic groundwater monitoring wells were gauged to determine depth <br /> to groundwater (DTW) and to check for the presence of separate-phase petroleum hydrocarbons. <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, the monitoring wells were purged and sampled. Field data <br /> sheets are presented in Attachment 3. The groundwater samples were analyzed for dissolved <br /> benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline <br /> (TPH-G). 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 /> Tim Watchers <br /> Project Manager <br /> PRkl' <br /> Attachment 1 Figure For: <br /> . Attachment 2 Table Wendell W. Lattz <br /> Attachment 3 Field Data Sheets Vice President, General Manager <br /> Attachment 4 Laboratory Report West Region <br /> QM&SR <br /> Offices throughout the U.S.,Canada and Overseas <br />