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0:10kGROUNDWATER <br /> 11:1M TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord,CA 94520(415)611-2387 <br /> FAX:(4151685-9148 <br /> July 8, 1994 Project No. 02010 4238 <br /> Mr. Brett Hunter d Z l <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 /> Former Chevron Service Station No. 9-7780 <br /> 3246 East Fremont Street <br /> Stockton, California <br /> Dear Mr. Hunter: <br /> Groodwater Technology, Inc. presents the quarterly groundwater monitoring and sampling data <br /> collected on June 2 and 27, 1994. Eight 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. A <br /> potentiometric surface map and a summary of groundwater monitoring data are presented in <br /> Attachments 1 and 2, respectively. After measuring DTW the monitoring wells were purged and <br /> sampled. Groundwater monitoring and sample collection protocol and field data sheets are <br /> 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 /> Written/Submitted by <br /> Kenneth P. hnson <br /> Project Manager <br /> PR Lyl <br /> Attachment 1 Figure For: <br /> t 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 U.S.,Canada and Overseas <br />