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OFE-1 <br /> GROUNDWATER <br /> ❑❑❑ TECHNOLOGY, INC. 4057 Port Chicago Highway Concord CA 94520(415)671-2387 <br /> FAX (415)685-9148 <br /> September 26, 1994 Project No 02010 4237 <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 /> Former Chevron Service Station No 9-6465 <br /> 5608 North Pershing Avenue <br /> Stockton, California <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc presents the quarterly groundwater monitoring and sampling data <br /> collected on September 2, 1994 Three 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 /> _�e '-- . _ — %_ <br /> Kenneth P Jo on <br /> Protect Manager <br /> P <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 /> GMBSR <br /> Offices throughout the US Canada and Overseas <br />