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I i r4 � GROUNDWATER ❑❑ TECHNOLOGY, INC. 1401Halyard Drive Suite 140,West Sacramento CA 95691,(916)372-4700 FAX(9I6)372-8781 September 10, 1992 Project No 02030 0163 Mr Clint B Rogers Chevron U S A Products Company 2410 Camino Ramon San Ramon, CA 94583-0804 RE QUARTERLY MONITORING AND SAMPLING ACTIVITIES CHEVRON SERVICE STATION NO 9-0342 1347 SOUTH ELDORADO STOCKTON, CALIFORNIA Dear Mr Rogers Groundwater Technology, Inc submits this letter as a summary of quarterly groundwater monitoring and sampling data collected at the above-referenced site on July 22, 1992 The • four site-related groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to check for the presence of separate-phase petroleum hydrocarbons A potentiometric surface map (Figure 1) and a summary of groundwater monitoring data (Table 1) are included After measuring DTW, the monitoring wells were purged and sampled Monitoring wells MW-1 and MW-2 are sampled on a semi-annual bass The groundwater samples were analyzed for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and tot=,' petroleum hydrocarbons-as-gasoline (TPH-G) Results of the chemical analyses are summarized in Table 1 Laboratory reports and chain-of-custody manifests are included in Attachment A All purge water generated during the sampling process was collected in a Department of Transportation (DOT)-approved purge water trailer and transported for recycling to the Chevron refinery in Richmond, California Groundwater Technology, Inc is pleased to assist Chevron on this project If you have any questions or comments please call our West Sacramento office Sincerely, Groundwater Technolog Inc Groundwater Technology, Inc Wr bmitte by Reviewed/Approved by r AMES W GRASTY, R -,RS Q4' ONIS, R G Environmental Geologis estig S kE� Eronmental Geologist • Project ManageraQ, • �i �� � JWG/EKS rc Oz Attachments *. ++� No 4422 cl) 01630TR2 LTR 14�+ -� ,�• r Offices throughoul the US Can 1,trt '0�