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RECEIVED <br /> CM <br /> LOE] <br /> GROUNDWATER bCT 9 6 1992 <br /> T CHN <br /> ENVIRONMENTAL HEALTH <br /> TECHNOLOGY, INC tote �t ��r1 <br /> � 1401Halya Dave Surte140,West Sacramento CA 95691 (916)372-4700 <br /> FAX(9161372-8781 <br /> October 6, 1992 Project No 02320 2459 <br /> Mr Brett Hunter <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0604 <br /> RE QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> FORMER CHEVRON SERVICE STATION 9-1918 <br /> 45 E HARDING WAY <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 on July 24, 1992, at the above-referenced site Three of the 11 on-site <br /> groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to check <br /> for the presence of separate-phase petroleum hydrocarbons The other eight monitoring wells have <br /> been dry since 1990 A potentiometric surface map (Figure 1) and a summary of groundwater <br /> . monitoring data (Table 1) are included After measuring DTW, each monitoring well containing water <br /> was purged and sampled The groundwater samples were analyzed for dissolved benzene, toluene, <br /> ethylbenzene and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline (TPH-G) Results <br /> of the chemical analyses are summarized in Table 1 Laboratory reports and chain-of-custody <br /> manifests are included in Attachment A All purge water generated during the sampling process was <br /> collected in a Department of Transportation (DOT)-approved purge water trailer and transported for <br /> recycling to the Chevron refinery in 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 b Reviewed/Approved by <br /> JAMES W GRASTY, A �g� D G 'D� E K SIMONIS, R G <br /> Environmental Geol rstG Q`S IEDJ gra Senior Environmental Geologist <br /> Project Manager <br /> � Q <br /> JWG/EKS rc uA No 4422 c <br /> Attachmentsq► <br /> 24590TR3 LTR <br /> Offices throughout the VS Canada and Overseas <br /> r <br />