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• - A=RZ <br /> ZMA <br /> Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone {209} 838-3507InU Ma 20 1993 <br /> FAX (209) 838-3509 RFM MAY 2 4 1993 Y <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <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 Second Quarter 1993 Monitoring Report for J B Terminal 6700 <br /> Grantllne Road, Tracy, California <br /> Dear Harlin <br /> On April 23, 1993, groundwater monitoring was conducted at the above referenced site on wells <br /> MW2, MW3, MW4 and MW5 (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 0 64 feet 1n the wells since the January 1993 <br /> monitoring Groundwater monitoring data 15 summarized in Table 1 Fhe gradient was <br /> calculated to be 1n a north-northeast direction at 0 006 tt/ft, which 1s consistent with previous <br /> gradients (Figure 2, Groundwater Gradient Map) <br /> Collected samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA method 5030/8020/8015 No <br /> petroleum hydrocarbon constituents were present above method detection limits in monitoring <br /> wells MW2, MW3, MW4 or MW5 Analytical data 1s presented in Table 2 The laboratory <br /> data sheets and chain-ot-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/monitoring round will occur in July 1993 and a quarterly <br /> monitoring report will be submitted in August <br /> i� <br /> 2QR-1993 I N1 <br /> �O <br />