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r GROUNDWATER 11:11:11D TECHNOLOGY, INC. 1401 Halyard Dnve,Suite 140,West Sacramento,CA 95691 (916)372-4700 FAX(916)372-8781 June 25, 1993 Project No 02070 4236 Mr Brett L Hunter Chevron U S A Products Company 2410 Camino Ramon San Ramon, CA 94583-0804 RE QUARTERLY MONITORING AND SAMPLING ACTIVITIES CHEVRON SERVICE STATION NO. 9-4275 2905 WEST BENJAMIN HOLT DRIVE STOCKTON, CALIFORNIA Dear Mr Hunter Groundwater Technology, Inc submits this letter as a summary of quarterly groundwater monitoring and sampling data collected at the above-referenced site on May 18, 1993 The seven 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 potentiometnc surface map (Figure 1) and a summary of groundwater monitoring data (Table 1) are included After measuring DTW, each monitoring well was purged and sampled The groundwater samples were analyzed for dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), and total 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 I 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 Technology, Inc Groundwater Technology, Inc Written/Submdted by Reviewed/Approved by BRUCE H EPPLER E K SIMONIS, R G Environmental Geologist Senior Environmental G ist Project Manager TEg9,D G& tED) PR_ffZt QQp' s�va DSB/BHE/EKS rb Attachments © Z 4236OTR2 LTR `�+" ` No.4422 y Offices throughout the U S Canada and Overseas „/y