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1S1 AY 3 '94 J M M <br /> GROUNDWATER <br /> OF11:11:1 TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord,CA 94520(415)671-2387 <br /> FAX (415)685 9148 <br /> April 29, 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 Monitonng 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 March 25, 1994 Three groundwater monitoring wells were gauged to determine depth <br /> to 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 potentiometnc 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 Field data <br /> sheets are presented in Attachment 3 The groundwater samples were analyzed for benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline (TPH-G) <br /> Laboratory reports and chain-of-custody records are included in Attachment 4 Monitoring well <br /> purge water was transported by Groundwater Technology to the Chevron Terminal in Richmond, <br /> 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 /> WnttenlSubmmed by <br /> /" 4 J'" <br /> im Watchers <br /> Project Manager <br /> PR-K,<- <br /> Attachment 1 Figure For <br /> Attachment 2 Table Wendell W Lattz <br /> Attachment 3 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 />