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!I! 1 3 3I downgradient (Brown's New and Brown's #1), with an additional water-quality well upgradient f from the Vernalis plant (Koster) that is sampled periodically (depending on the availability of an E engine for the pump) (Figure 1). I r In regard to the water-level monitoring, the twelve network wells encompass the six parcels r proposed for mining (GW Consulting Engineers, 1991) in an area approximately two miles west to east and three miles north to south in order to allow for the assessment of ground-water flow directions. The Hall and Faulkner wells are shallow domestic wells and are tested for general minerals, nitrate, and total coliform bacteria. The Koster well is an irrigation well and the South Tracy #1 and two Brown's wells are deep production wells, all of which are tested for general minerals and nitrate. The remainder of the network wells are irrigation wells, excluding the Rustan domestic well, and are usually monitored for water levels only. I i At each well in the monitoring network, the elevations of the ground surface and well head were surveyed by LSCE in November and December, 1994. Ground surface and well head elevations were referenced to several local bench marks (DWR, USBR, and San Joaquin County) relative to the USGS datum. The survey was conducted so that measured ground-water depths could be equated to ground-water elevations that, in turn, could be used to define ground-water flow directions beneath the area. i 'E I i I I I I 1_UHDORFF 6 SCALMANINI i I'i� rrws W�ci s: r, For[; i racea s i ® I �I