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i <br /> N <br /> - AffZ��A <br /> . Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209)838-3507 <br /> FAX (209)838-3509 <br /> August 27, 1992 <br /> 16 E L I II <br /> Mr Steve Schneider R FE0 C r"M Ix Di <br /> San Joaquin County Public Health Services SEP 0 1 192 <br /> Environmental Health Division ENVIRONMENTAL HEALTH <br /> P O Box 2009 PERMIT/bERY160 <br /> Stockton, CA 95201 <br /> RE Third Quarter 1992 Monitoring Report for J B Terminal 6700 <br /> Grantline Road, Tracy, California <br /> Dear Steve <br /> On July 30, 1992, groundwater monitoring was conducted at the above referenced site on wells <br /> MWI, MW2, MW3, MW4 and MW5 (Figure 1) During monitoring, t49 depths to water were <br /> measured, the wells were purged and samples were collected pursuant to RESNA/WaterWork's <br /> (RESNA) Quality Assurance/Quality Control Plan Well purg; 161��Io monitoring data are <br /> included in Attachment 1 <br /> Groundwater elevations have risen from 6 0 to 6 4 feetZin the wells since the March 1992 <br /> monitoring Groundwater monitoring data is summarized in Table I The gradient was <br /> calculated to be in a north-northeast direction, at 0 003 ft/ft, which is consistent with previous <br /> gradients (Figure 2, Groundwater Gradient Map) <br /> Samples collected were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA method 503018020/8015 <br /> Dissolved petroleum hydrocarbons were detected in monitoring well MW1 in the following <br /> concentrations 29,000 µglf TPHG, 75 µg/f benzene, and 12 µg/f toluene, 300 µglf <br /> ethylbenzene, and 1000 tcgl f xylenes Xylenes (0 59 µg/f) and TPHG (73 µglf) were also <br /> detected in monitoring well MW2 No petroleum hydrocarbon constituents were present above <br /> method detection limits in monitoring wells MW3, MW4 or MW5 Analytical data is presented <br /> QR082592 F'NL <br />