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2 <br /> Scmiv'YED <br /> H. Ground-Water Monitoring Network <br /> The ground-water monitoring network for water-level and quality measurements consists of <br /> I twelve water supply wells, six of which are sampled for general mineral and nitrate analyses <br /> (Figure 1). Of the Iatter six wells, two are domestic wells that are also sampled for <br /> v bacteriological analyses. The analyses for general minerals and nitrate meet Title 22 requirements <br /> f <br /> and Standard Methods 908A (10-tube procedure) was used for the total coliform bacteria <br /> r <br /> analyses. <br /> i <br /> 4 <br /> According to the conditions specified in San Joaquin County Permit No. QX-91-5 (the permit), <br /> the ground-water monitoring network was to consist of a minimum of ten wells for the <br /> measurement of water levels and a minimum of five wells for water-quality testing. The wells <br />€ for water-duality testing were to be located such that two wells were upgradient from the Vernalis <br />! plant site, one on site, and two downgradient. As part of a separate preliminary investigation <br /> I conducted by LSCE in 1991 and 1992, ground-water level measurements in many of the current <br /> i network wells indicated that the ground-water flow direction beneath the area was to the <br /> I <br /> i <br /> southeast; depths to ground water ranged between 80 feet beneath the north and nortli-eastern <br /> portions of the area and 250 feet beneath the southwest portion. Further, a confining clay was <br /> identified beginning at an approximate depth of 250 feet beneath the Lone Tree 1 Parcel that <br /> appeared to divide the underlying aquifer into shallow and deep zones. This clay is most likely <br /> i <br /> the Corcoran Clay Member of the Tulare Formation, which has been reported to extend beneath <br /> much of the San Joaquin Valley, including the present monitoring network area (Hotchkiss, <br /> 1972). <br /> The monitoring network was established based on those initial monitoring results in order to <br /> i satisfy or exceed the permit conditions. The network is comprised of two water-quality wells <br /> upgradient from the Vernalis plant (Hall and Faulkner), one onsite (South Tracy 41), and two <br /> F ' <br />