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�a <br /> ti <br /> 6 '9'i l P y 'd , <br /> GROUNDWATER <br /> ❑❑ TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord CA 94520(415)6712387 <br /> FAX (415)685 9148 <br /> I <br /> May 13, 1994 Project No 02010 4235 <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 Samphng Activities <br /> Former Chevron Service Station No 9-5075 <br /> 2400 Airport Way <br /> Stockton, California <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc presents the quarterly groundwater monitoring and sampling data <br /> collected on April 6, 1994 Three groundwater monitoring wells were gauged to determine depth to <br /> 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 Groundwater <br /> monitoring and sample collection protocol and field data sheets are presented in Attachment 3 <br /> The groundwater samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> total petroleum hydrocarbons-as-gasoline (TPH-G) Laboratory reports and chain-of-custody <br /> records are included to Attachment 4 Monitoring well purge water was transported by <br /> Groundwater Technology to the Chevron Terminal 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 /> Wntten/Submitted by <br /> �rG... �►�JC�-C.C.f�.csA� <br /> Tim Watchers <br /> Project Manager <br /> PR_ '� <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 S,Canada and Overseas <br />