Laserfiche WebLink
3�f °,ux�•;r ;r. 4.Wlffi��'-W;i a. *r+f <br /> k• <br /> GROUNDWATER <br /> a❑ TECHNOLOGY, INC. 4057 Purl Chicago Highway.Concord.CA 94520(415)671.2387 <br /> ^� FA\:01i16M,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 94583 <br /> Subject: Groundwater Monitoring Report <br /> Chevron Facility No. 9-0557 <br /> 139 South Center <br /> Stockton,California <br /> Dear Mr. Rogers: <br /> This letter report has been prepared for Chevron J.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 monhored on September 12, 1991,to determine <br /> depth-to-groundwater(DTW),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 polentiometric surface lines. The groundwater Stopes to the southeast <br /> with a calculated gradient of.003 ft/ft. <br /> After measuring the DTW,the four monitoring wells were purged and sampled on September i2, 1991. <br /> All of the groundwater samples were analyzed for the presence of benzene,toluene, eth+�benzene, <br /> t xylenes (BTEX), and total petroleum hydrocarbons(TPH)-as-gasoline. Table 1 presents a summary of <br /> the current and historical groundwater monitoring data anr' 'ytical results. Copies of the analytical <br /> reports are attached. <br /> Offirra rhroayhow rhe CS..Canada and Orerveas <br />