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Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209)838-35411 <br /> FAX (209)838-3509 r l ,, ,�,<�,�� E `-� <br /> Jaiiaury 30, 1992 <br /> Mr Stew- Schneider <br /> San Joaqu.:i County Public Health Services <br /> Environment,11 Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE First Quarter 1992 Monitonng Report for 1.13 Terminal 6700 <br /> Grantline Road, Tracy, California. <br /> Dear Steve <br /> On Janaury 13, 1992, groundwater monitonng was conducted at the above referenced site on <br /> wells MW 1, MW2, and MW3 (Figure 1) During monitonng, the 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 purge logs and monitoring data are <br /> included in Attachment 1 <br /> Groundwater elevations have decreased 2.93 to 3 06 feet in all wells since the October 1991 <br /> monitoring. Groundwater monitoring data is summarized in Table 1 The gradient was <br /> calculated to be in a north-northeast direction at 0.005 ft/ft, which is consistent with previous <br /> gradients (Figure 2, Groundwater Gradient Map). <br /> Samples colltacted were analyzed for benzene, toluene, ethylben:ene, and xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA methoc 5030/8020/8015 <br /> Dissolved petroleum hydrocarbons were detected irr monitoring well MW 1 at the folloA inP_ <br /> concentrations 410 µg/e TPHG, 9 0 µg/f ethylbenzene, and 3 8 µg/f xylenes No petroleum <br /> hydrocarbon constituents were detected above method detwion limits in monitonng wells MW2 <br /> or MW3 Analytical data is presented in Table 2 The laboratory data sheets and cha,n-of- <br /> custody documentation are included in Attachment 2 Laboratory analyses were conducted by <br /> . 0013092 knt <br />