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DEC 31 '92 PWM <br /> "EIWGRoUNDWATER J A N 0 7 9993 <br /> CNV aHEALTH INC PE4RJF1qnd <br /> West Sacramento CA 95691 (916)372 <br /> 11700 <br /> PAX(916)372-8781 <br /> December 21, 1992 Project No 02320 2459 <br /> Mr Clint B Rogers <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 /> FORMER CHEVRON SERVICE STATION 9-1918 <br /> 45 E. HARDING WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Rogers <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 October 26, 1992 Three of the 11 on- <br /> site groundwater monitoring wells were gauged to determine depth to groundwater (DTW) and to <br /> check for the presence of separate-phase petroleum hydrocarbons The other eight monitoring wells <br /> have 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 monitonng 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 (fPH-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/S matted by Reviewed/Approved by <br /> I r <br /> ES W GRASTY, R E K SIMONIS, R G <br /> nvironmental Geolog t FRED G or Environmental Geologist <br /> Project Manager G�S� k <br /> tED) <br /> s�Na <br /> JWG/EKS rc 0 <br /> Attachments %AJ No 4421 c,) <br /> 24590TR3 LTR <br /> CALr <br /> Offices throughout the U S Canada and Overseas <br />