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i <br /> 1� <br /> 4 <br /> Oil JEW GROUNDWAT <br /> ER <br /> ❑❑❑ <br /> TECHNOLOGY, INC. 4057 Port ort Chicago Highway Concord CA 94520(415)671-2387 <br /> November 7, 1994 FAX (415)685 9148 <br /> Mr Brett Hunter Project No 02010 4239 <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 9-1918 <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 October 3, 1994 Ten groundwater monitoring wells were gauged to determine depth <br /> to groundwater (DTW) and to check for the presence of separate-phase petroleum hydrocarbons <br /> Monitoring wells MW-1, MW-7 and MW-8 were dry Monitoring wells MW-3, MW-4, MW-5 and MW- <br /> 6 were sealed shut and could not be monitored or sampled Separate-phase hydrocarbons were <br /> • not detected in the monitoring wells A potentiometric surface map and a summary of groundwater <br /> monitoring data are presented in attachments 1 and 2, respectively After measuring DTW, <br /> monitoring wells MW-2R, MW-9, MW-10, MW-11, MW-12, MW-13 and MW-14 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 <br /> 2 � <br /> Kenneth nson <br /> PRj��- Project Manager <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 /> Qm&SR <br /> Offices throughout the U 5 Canada and Overseas <br />