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X11 <br /> j1w <br /> 417 '931MA1 <br /> • <br /> FIEI� <br /> GROUNDWATER <br /> ❑❑❑ TECHNOLOGY, INC. 1401 Halyard Drive,Suite 140,West Sacramento,CA 95691,(916)3724700 <br /> FAX(916)372-8781 <br /> May 14, 1993 Project No 02070 4235 <br /> Mr Brett L Hunter <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> RE QUARTERLY MONITORING ACTIVITIES - <br /> FORMER CHEVRON SERVICE STATION NO 9-5075 <br /> 2400 AIRPORT WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc presents this letter as a summary of quarterly groundwater monitoring <br /> and sampling data collected at the above-referenced site During the past few quarters, the <br /> groundwater monitoring wells were inaccessible and were not monitored or sampled On April 13, <br /> 1993 the four groundwater monitoring wells were gauged to determine depth to groundwater (DTW) <br /> iand to check for the presence of separate-phase petroleum hydrocarbons A potentiometric surface <br /> map (Figure 1) and a summary of groundwater monitoring data (fable 1) are included After <br /> measuring DTW, each monitoring well was purged and sampled Groundwater samples were <br /> collected and analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G) Results of the chemical analyses are summarized in Table 1 <br /> Laboratory reports and chain-of-custody records are included in Attachment I All purge water <br /> generated during the sampling process was collected in a Department of Transportation (DOT)- <br /> approved purge water trailer and transported for recycling at the Chevron refinery in Richmond, <br /> 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 /> D (6,�� <br /> BRUCE H EPPLER E K SIMONIS, R G G� IE.D) <br /> Environmental Geologist Senior Envir(o Y11'ogist <br /> Project Manager Q F <br /> PR W No 4422 <br /> DSB/ HE/EKS rb , ^ <br /> Attachments '�q g�11 <br /> 42350SR2 LTR <br /> CAbI F <br /> Offices throughout the U S,Canada and Overseas <br />