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E <br /> i � <br /> I <br /> 2 . <br /> I <br /> i <br /> I <br /> U. Ground-Water Monitoring Network <br /> I <br /> i <br /> The ground-water monitoring network for water-level and quality measurements consists of <br /> twelve water supply wells, six of which are sampled for general mineral and nitrate analyses <br /> (Figure 1). Of the latter six wells, two are domestic wells that are also sampled for <br /> bacteriological analyses. The analyses for general minerals and nitrate meet Title 22 requirements <br /> and Standard Methods 908A (10-tube procedure) was used for the total coliform bacteria <br /> analyses. <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-quality 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 /> conducted by LSCE in 1991 and 1992, ground-water level measurements in many of the current <br /> network wells indicated that the ground-water flow direction beneath the area was to the <br /> southeast; depths to ground water ranged between 80 feet beneath the north and north-eastern <br /> j portions of the area and 250 feet beneath the southwest portion. Further, a confining clay was <br /> r` 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 /> 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 /> 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 #1), and two <br /> LUH1DCRFF S SGALMANINI <br /> C Q ' 5 iJ'_ i N U E N U i.N E-.R `C/ <br />