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In 5 recovery by late fall (Figure 2). Beginning in early 1995, ground-water levels beneath the eastern portion of the monitored area rose very gradually (approximately two feet), as seen in wells 4S/6E-5A1 and 4S/6E-6A1 (see Figure 2) and in the Koster well (see Appendix). Ground-water depths and elevations measured in all wells during each quarter of the four years of monitoring I are presented in Table 1. In comparison to the shallow wells, ground-water levels in the deep wells were deeper and i fluctuated more throughout the last four years, presumably in response to pumping of those i and/or other nearby deep wells during that time. The static water levels in the Petz irrigation well have fluctuated seasonally approximately 5 to 10 feet, with the lowest observed levels during the fall and highest levels in the winter (Figure 3). Static water levels in the South Tracy 41 production well have fluctuated as much as 35 feet during 1994 through 1997 and a pumping level observed in March 1994 was 75 feet below the lowest static water level'( gur"e'!4) INIE E i Static water levels have been measured in the Brown's #1 production well since January 1995 (during the beginning of 1994, water levels could not be measured because the well was being pumped at the time and the pumping levels were deeper than the length of the sounder) and these water levels are well below shallow ground-water levels. Measurement of the water level in the Ponderosa production well has not been possible due to a blocked airline. The airline of the Brown's New production well was repaired in mid-1996, facilitating water-level measurements from the well during the last year and a half. However, these measurements are not consistent n and may indicate that there is a problem with the airline or its reported length. The ground-water elevations and fluctuations observed during the last four years of monitoring illustrate the difference between the shallow and deep zones beneath the monitoring network area. i in the shallow wells, ground-water elevations have ranged from 76 to 86 feet MSL across the area with generally less than three feet of seasonal fluctuation, indicating the upper zone (above the confining clay) is an unconfined or "water table" aquifer. Alternatively, in the deep wells (i.e., those completed below the base of the confining clay, which is at an approximate elevation of 75 feet below mean sea level), static ground-water elevations have ranged from 17 feet below I ® WH ORP S SCAL.MANiNI C0 •.S F