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CCE 3 '93 <br /> . GROUNDWATER <br /> �T TOL <br /> !_ I TECH OG I v j INC. 1401 Halyud Drive.50040,We_stSacramento,CA 95691,(916)372-1700 <br /> FAX 49161372-8781 <br /> September 30, 1993 Project No. 02070 3983 <br /> Mr. Brett Hunter <br /> Chevron U.S.A. Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> RE: QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> CHEVRON SERVICE STATION NO. 9-0557 <br /> 138 SOUTH CENTER STREET <br /> STOCKTON, CALIFORNIA <br /> Dear Mr. Hunter: <br /> Groundwater Technology, Inc. submits this fetter as a summary of quarterly groundwater monitoring <br /> and sampling data collected at the above-referenced site on August 17, 1993. The five site-related <br /> groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to check <br /> for the presence of separate-phase petroleum hydrocarbons. A potentiometric surface map <br /> (Figure 1) and a summary of groundwater monitoring data (Table 1) are included. After <br /> measuring DTW, each monitoring well was purged and sampled. The groundwater samples were <br /> analyzed for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G). Results of the laboratory analyses are summarized in Table 1. <br /> Laboratory reports and chain-of-custody manifests are included in Attachment I. All purge water <br /> generated during the sampling process was collected in a Department of Transportation <br /> (DOT)-approved purge water trailer and transported for recycling to the Chevron refinery in <br /> Richmond, California. <br /> Groundwater Technology, Inc. Is pleased to assist Chevron on this project. If you have any <br /> questions or comments please call our West Sacramento office. <br /> Sincerely, <br /> Groundwater Technology, Inc. Groundwater Technology, Inc. <br /> Written/Submitted by Reviewed/Approved by <br /> BRUCE H. EPPLER E.K. SIMONIS, R.G. <br /> Environmental Geologist Senior Environmental Geolo <br /> Project Manager GS�EfLE1�°L� <br /> t <br /> PR � k <br /> SKY/ /EKS:rz y p <br /> Enclosure C3 ? <br /> a9830ras.LTR uA No.4422 c.) <br /> Offices throughout the L'.S.,Canada and Overseas CA <br />