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71 <br /> .3 <br /> GROUNDWATER <br /> ❑ ❑ TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord,CA 94520(415)671-2387 <br /> FAX (415►685-914$ <br /> August 8, 1994 <br /> Project No 02010 4239 _ <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 Actwittes <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 July 8, 1994 Fourteen 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-2R, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8 and MW-14 were dry <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, monitoring wells MW-9, MW-10, MW-11, MW-12 and MW-13 <br /> were purged and sampled Groundwater monitoring and sample collection protocol and field data <br /> sheets are presented in attachment 3 The groundwater samples were analyzed for benzene, <br /> toluene, ethylbenzene, xylenes, and total petroleum hydrocarbons-as-gasoline Laboratory reports <br /> and 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/ ubmitted b <br /> enneth PJoh on <br /> Project Ma er <br /> PR�� ext-2ZZ <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 /> OM&SR <br /> Offices throughout the US Canada and Overseas <br />