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Ground-Water Levels Ground-water levels measured in the shallow wells were generally stable throughout the seven-year monitoring period,typically fluctuating three feet or less during this time. Ground-water elevations in the shallow zone have ranged from approximately 75 feet MSL in the southeast portion of the monitoring network area to 87 feet MSL to the northwest. The lowest ground-water levels in the shallow network wells have been observed generally during the late spring to summer, with recovery by late fall (Figure 2). Between 1995 and late 1998, ground-water levels beneath the eastern portion of the monitored area rose very gradually (approximately three feet), as seen in wells 4S/6E-5A1 and 4S/6E-6A1 (see Figure 2) and in the Koster well (see Appendix). Ground-water levels beneath the northern portion of the area began rising somewhat later, in late 1996. During 1999 and 2000, ground-water levels beneath the area declined approximately five feet. Ground-water depths and elevations measured in all wells during each quarter of the monitoring period are presented in Table 1. n In comparison to the shallow wells, ground-water levels in the deep wells were deeper and fluctuated more throughout the last seven years, presumably in response to pumping of those and/or other nearby deep wells during that time. The static water levels in the Petz irrigation well fluctuated n seasonally approximately 5 to 10 feet, with the lowest observed levels during the fall and highest levels in the winter(Figure 3), until 1998 when water levels stabilized at approximately the same level as the shallow wells (80-86 feet MSL). Water levels in the Petz well declined slightly during 1999 similar to the water levels in the shallow wells; during 2000, the Petz well water levels increased slightly in contrast to water levels in the shallow wells. Static water levels in the South Tracy#1 production well fluctuated seasonally less than 40 feet during 1994 through 1997 (Figure 4); since then, the static levels have stabilized during the winter period between 20 and 40 feet MSL and pumping levels (during summer and fall) have been sufficiently low that such measurement was not possible. ML N LE SCHNNED 6 © LUHOORFF & SCALMANINI CONS"L T I N G ENGIN EER S