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AUG 23931 M M. <br /> I _i GROUNDWATER <br /> E-11:11:1 TECHNOLOGY INC. 1 <br /> 401 Halyard Dnve Suite140 West Sacramento CA 95691 (916)3724700 <br /> FAX(916)372-8781 <br /> August 19, 1993 Project No 02070 4237 <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 STATION NO 9-6465 <br /> 5508 NORTH PERSHING AVENUE <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Hunter <br /> Groundwater Technology, Inc submits this letter as a summary of quarteriy groundwater monitoring <br /> and sampling data collected at the above-referenced site on June 24, 1993 Thirteen srte-related <br /> groundwater monitoring wells were gauged to determine depth to groundwater (DTVI) and to check <br /> for the presence of separate-phase petroleum hydrocarbons A potenttometrnc surface map <br /> (Figure 1) and a summary of groundwater monitoring data (Table 1) are included After measuring <br /> DTW, nine monitonng wells were purged and sampled Wells MW-6, MW-3 and MW-1 did not <br /> contain enough water, and well MW-2 was dry, therefore these wells were not purged or sampled <br /> The groundwater samples were analyzed for dissolved benzene, toluene, ethylbenzene and xylenes <br /> (STEX), and total petroleum hydrocarbons-as-gasoline (TPH-G) Results of the chemical analyses <br /> are summarized in Table 1 Laboratory reports and chain-of-custody manifests are included in <br /> Attachment I All purge water generated during the sampling process was collected in a Department <br /> of Transportation (DOT)-approved purge water trailer and transported for recycling to the Chevron <br /> 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 G <br /> Environmental Geologist Senior Environmental Geologist <br />. Project Manager _t1 <br /> PR (uJ <br /> �� J� .DSS/ HE/EKS rz <br /> 0ZAttachments �4� y4237QTR2 LTROffices throughout the U5 Canada and Overseas � O�r'r ,TIF <br />