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•may» <br /> PA <br /> W- Ifl y _. yC. ,:..•. k'� &a -45;: a::,. ri .� "�°'^�_ dam_ <br /> �, 4w En. F[ 1 :,`"i'. :FytQ' � '�F e' °Y. f.l y... •rc 6 ' <br /> n. <br /> i <br /> S i <br /> GROUNDWATER <br /> �0❑ TECHNOLOGY INC. <br /> TECHNOLOGY, 4057 Port Chicago FEiKhway,Concord.CA 94520(43)671-2387 '1 <br /> FAX:14151 f,85-9148 <br /> October 7, 1991 <br /> Job No.020301653 <br /> Mr.Clint Rogers <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon <br /> Bishop Ranch#6 <br /> San Ramon, CA 945133 <br /> Subject: Groundwater Monitoring Report <br /> Chevron Facility No.9.0557 <br /> 139 South Center <br /> Stockton,California <br /> Dear Mr.Rogers: <br /> j This letter report has been prepared for Chevron U.S.A.and summarizes the results of routine <br /> groundwater monitoring and sampling performed by Groundwater Technology, Inc.at the above- <br /> referenced site. <br /> The four monitoring wells at this Chevron facility were monitored on September 12, 1991,to determine { <br /> depth-to-groundwater(DTIV),hydraulic gradient,and to check for the presence of separate-phase <br /> hydrocarbons. Table 1 presents the current and historical groundwater-monitoring data. Figure 1 shows <br /> well locations and groundwater potentlometrtc surface tines. The groundwater slopes to the southeast <br /> with a calc!Qated gradient of.003 ft/ft. <br /> i <br /> After measuring the DTW,the four monitoemg:weiis were purged and sampled on September 12, 1991. <br /> All of the groundwater samples were analyzed for the presence of benzene,toluene,ethyibenzena, <br /> xylenes (BTEX),and total petroleum hydrocarbons (TPH)-as-gasollne. Table 1 presents a summary of <br /> the current and historical groundwater monlioring data and analytical results. Copies of the analytical <br /> i <br /> reports are attached. <br /> r <br /> { <br /> 4 <br /> 1 <br /> F <br /> F <br /> Ottim Mwwhnuf the US..Canada and Ot areas <br />