Laserfiche WebLink
I � <br /> 1 <br /> SCRNNED <br /> II. Ground-Water Monitoring Network <br /> The ground-water monitoring network for water-level and quality measurements consists of twelve <br /> water supply wells, all of which are measured for water levels and six of which are sampled for <br /> general mineral and nitrate analyses (Figure 1). Of the latter six wells, two are domestic wells that <br /> are also sampled for bacteriological analyses. The analyses for general minerals and nitrate meet <br /> Title 22 requirements and the total coliform bacteria analyses have been conducted using the <br /> Standard Methods 908A (10-tube) procedure. <br /> According to the conditions specified in San Joaquin County Permit No. QX-91-5 (the permit), the <br /> ground-water monitoring network was to consist of a minimum of ten wells for the measurement of <br /> n water levels and a minimum of five wells for water-quality testing. The wells for water-quality <br /> testing were to be located such that two wells were upgradient from the Vernalis plant site, one on <br /> site, and two downgradient. As part of a separate preliminary investigation conducted by LSCE in <br /> 1991 and 1992, ground-water level measurements in many of the current network wells indicated <br /> that the ground-water flow direction beneath the area was to the southeast; depths to ground water <br /> ranged between 80 feet beneath the north and north-eastern portions of the area and 250 feet beneath <br /> the southwest portion. Further, a confining clay was identified beginning at an approximate depth of <br /> 250 feet beneath the Lone Tree I Parcel that appeared to divide the underlying aquifer into shallow <br /> and deep zones. This clay is most likely the Corcoran Clay Member of the Tulare Formation, which <br /> has been reported to extend beneath much of the San Joaquin Valley, including the present <br /> monitoring network area(Hotchkiss, 1972). <br /> The monitoring network was established based on those initial monitoring results in order to satisfy <br /> or exceed the permit conditions. The network is comprised of two water-quality wells upgradient <br /> r-� <br /> 3 <br /> © LIJHDORFF 6 SCALMANINI <br /> G O N S U 4 T I N G FNGINEERG <br />