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E] GROUNDWATER R ❑ TECHNOLOGY, INC. 4057 Port Chicago Highway Concord CA 94520(4I5)6712 387 FAX (415)685-9348 November 4, 1994 Project No 02010 4236 Mr Brett Hunter Chevron U S A Products Company Cj 2410 Camino Ramon San Ramon, CA 94583-0804 SUBJECT Quarterly Monitoring and Sampling Activities Chevron Service Station No 9-4275 2905 West Benjamin Holt Drive Stockton, California Dear Mr Hunter Groundwater Technology, Inc presents the quarterly groundwater monitoring and sampling data collected on September 29, 1994 Nine groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to check for the presence of separate-phase petroleum hydrocarbons Separate-phase hydrocarbons were not detected in the monitoring wells A potentiometric surface map and a summary of groundwater monitoring data are presented in attachments 1 and 2, respectively After measuring DTW the monitoring wells were purged and sampled Groundwater monitoring and sample collection protocol and field data sheets are presented in attachment 3 The groundwater samples were analyzed for benzene, toluene, ethylbenzene, xylenes and total petroleum hydrocarbons-as-gasoline Laboratory reports and chain-of-custody records are included in attachment 4 Monitoring well purge water was transported by Groundwater Technology to the Chevron Terminal in Richmond, California, for recycling Groundwater Technology, Inc is pleased to assist Chevron on this project If you have any questions or comments please call our Concord office at (510) 671-2387 Sincerely, Groundwater Technology, Inc Written/Submitted by_ Kenneth P Jo on Project Maria PRC�A Attachment 1 Figure For Attachment 2 Table Wendell W Lattz Attachment 3 Protocol and Field Data Sheets Vice President, General Manager Attachment 4 Laboratory Report West Region oMasR Offices throughout the US Canada and Overseas