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1 J <br /> OCT 7 'gal M.M., <br /> a <br /> GROUNDWATER <br /> TECHNOLOGY, INC. 1401 Halvard Dnve Suite 140 West Sacramento,CA 95691,(916)372-4700 <br /> October 4, 1993 Project No 02070 39984j372 8781 <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 /> FORMER CHEVRON SERVICE STATION NO 9-0342 <br /> 1347 SOUTH EL DORADO 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 August 17, 1993 Two 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 wells MW-1 <br /> and MW-2 were not located MW-1 possibly hes underneath the new concrete pad at the site and <br /> MW-2 was covered with dirt and debris A potentiometnc surface map (Figure 1) and a summary of <br /> groundwater monitoring data (Table 1) are included After measuring DTW, monitoring wells MW-3 <br /> and MW-4 were purged and sampled The groundwater samples were analyzed for dissolved <br /> benzene, toluene, ethyibenzene and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline <br /> (fPH-G) Results of the chemical analyses are summarized in Table 1 laboratory reports and <br /> chain-of-custody manifests are included in Attachment I All purge water generated during the <br /> sampling process was collected in a Department of Transportation (DOT)-approved purge water <br /> trailer and transported for 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 by Reviewed/Approved by <br /> BRUCE H EPPLER E K SIMONIS, R FRED G41 <br /> Environmental Geologist Senior Environm Lac <br /> Project Manager <br /> PH.� <br /> a <br /> DSB/BHE/EKS rz W No 4422 c'% , <br /> Attachments ,r <br /> 39a4QTR3 LTR <br /> Offices throughout the US CanadeandOverseas � OFCAGIFO�r <br />