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MM 15 '93J MA <br /> ® GROUNDWATER <br /> EILI E] TECHNOLOGY, INC. <br /> 1401Halyard Drive,Suite 140,West Sacramento CA 95691 (916)372-4700 <br /> FAX(916)372-8781 <br /> March 10, 1993 Project No 02030 0163 <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 9-0342 <br /> 1347 SOUTH ELDORADO STREET <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc submits this letter as a summary of quarterly groundwater monitoring <br /> and sampling data collected at the above-referenced site on February 16, 1993 Three of the four <br /> site-related groundwater monitoring wells were gauged to determine depth to groundwater (DTW) <br />. and to check for the presence of separate-phase petroleum hydrocarbons Monitoring well MW-1 <br /> was not located and possibly lies underneath the new concrete pad at the site The well box around <br /> monitoring well MW-2 has been destroyed and needs to be replaced A potentiometric surface map <br /> (Figure 1) and a summary of groundwater monitoring data (Table 1) are included After measuring <br /> DTW, monitoring wells MW-2, MW-3 and MW-4 were purged and sampled The groundwater <br /> samples were analyzed for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total <br /> petroleum hydrocarbons-as-gasoline (TPH-G) Results of the chemical analyses are summarized in <br /> Table 1 Laboratory reports and chain-of-custody manifests are included in Attachment I All purge <br /> water 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/ApRroved by <br /> .-- G� C , <br /> BRUCE H EPPLER. g E K SIMONIS, R $��En��Jpca Environmental Geologist Senior Environ o`f rtn <br /> Project Manager <br /> Sb-tB/BHE/EKS rb W No 4421 <br /> Attachments <br /> 01630TR1 LTR <br /> Offices throwhoul the G S Canada and Or erseat <br /> ��'CALI F4 <br />