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T <br /> l <br /> GROUNDWATER <br /> ❑� TECHNOLOGY, INC. 4057 Port Chicago Highway Concord,CA 94520(415)671-2387 <br /> FAX (415)685-9148 <br /> September 6, 1994 Project No 02010 3984 <br /> Mr Brett Hunter <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> SUBJECT Semi-annual Monitonng and Sampling Activities <br /> Former Chevron Service Station No 9-0342 <br /> 1347 South EI Dorado Street <br /> Stockton, California <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc presents the semi-annual groundwater monitoring and sampling data <br /> collected on August 5, 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 Monitoring well MW-1 <br /> has been abandoned and is no longer gauged or sampled A potentiometric surface map and a <br /> • summary of groundwater monitoring data are presented in attachments 1 and 2, respectively After <br /> measuring DTW, the monitoring wells MW-2, MW-3 and MW-4 were purged and sampled <br /> Groundwater monitoring and sample-collection protocol and field data sheets are presented in <br /> attachment 3 The groundwater samples were analyzed for benzene, toluene, ethylbenzene, <br /> xylenes, and total petroleum hydrocarbons-as-gasoline Laboratory reports and chain-of-custody <br /> records are included in attachment 4 Monitoring well purge water was transported by Groundwater <br /> 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 Techno gy, Inc. <br /> Wn ubmitte <br /> Kenneth P Ja <br /> P R,�� 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 /> QMSSR <br /> Offices throughout the U 5 Canada and Overseas <br />