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d <br /> �.: RX <br /> rlt I Qt-R VI E � Working To Restore Nature <br /> AUG 13 <br /> 1710 Main Street 1 l <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 August 11, 1993 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE- Third Quarter 1993 Monitoring Report for J B Terminal 6700 Grantlme Road, <br /> Tracy, California <br /> 1W Dear Harkin. <br /> On July 12, 1993, groundwater monitoring was conducted at the above referenced site on wells <br /> MW2, MW3, MW4 and MWS (Figure 1) During monitoring, the depths to water were <br /> measured, the wells were purged and samples were collected pursuant to RESNA's Quality <br /> Assurance/Quality Control Plan. Well purge logs and monitoring data are included in <br /> Attachment 1. <br /> Groundwater elevations have risen an average of 3 13 feet in the wells since the April 1993 <br /> monitoring Groundwater monitoring data is summarized in Table 1. The gradient was <br /> calculated to be in a north-northeast direction at 0.004 ft/ft, which is consistent with previous <br /> gradients (Figure 2, Groundwater Gradient Map) <br /> Collected samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (B A EX), and <br /> total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA method 503013020/8015 leo <br /> petroleum hydrocarbon constituents were present above method detection h.mits in monitoring <br /> wells MW2, MW3, MW4 or MW5 Analytical data is presented in Table 2. The 121-torato_ry <br /> data sheets and chain-of-custody documentation are included in Attachment 2. Laboratory <br /> analyses were conducted by Sequoia Analytical Laboratories, Cal EPA, ELAP Certification No <br /> 1210. <br /> The next groundwater sampling/monitonng round will occur in October 1993 and a quarterly <br /> monitoring report will be submitted in November <br /> J <br /> 3QR-1993 PNL <br /> ,bQ� <br />