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3 <br /> 71 <br /> I <br /> 6 € <br /> mean sea level to 50 feet MSL across the area. These ground-water elevations combined with <br /> observed fluctuations as great as 35 feet indicate the lower zone is a confined aquifer and that a J <br /> downward vertical gradient exists between the upper and lower zones. <br /> l <br /> been to the southeast during the last <br /> hallow round-water flow has consistently b so g <br /> The direction of s g <br /> four years with only slight fluctuations of shallow ground-water levels beneath the area. The <br /> ground-water elevation contour maps for March and October 1994 (Figures 5 and b, respectively) <br /> illustrate the shallow ground-water flow direction and areal change in ground-water levels <br /> between the early spring and fall of that year. During 1995, the water table declined to the <br /> lowest observed levels by late spring to summer and generally recovered by the fall. Ground- <br /> water levels continued to rise very gradually beneath the eastern portion of the area during 1996, <br /> and by October a slight shift in flow direction toward the east-southeast and a slight flattening of <br /> the gradient was visible beneath the monitored area (Figure 7). This change in direction of flow <br /> and gradient generally continued during 1997, as seen in the ground-water elevation contour maps <br /> for April and October 1997 (Figures 8 and 9, respectively). <br /> h <br /> d water levels from the dee South <br /> maps p <br /> The contour mp were prepared pared without including the observe <br /> f <br /> Tracy #1 or Browns # Y are' 1 wells because the representative of the deep ground water zone. <br /> Also, the observed water levels from the Petz well, which is completed in both shallow and deep <br /> zones of the underlying aquifer, were not used in preparing the contour maps. The Petz well <br /> water levels have been in an intermediate elevation range between those measured in wells solely <br /> completed in the shallow or deep zones, and may represent a "composite" of shallow and deep <br /> zone water levels. <br /> i <br /> I <br /> Ground-Water Quality <br /> 1 <br /> i <br /> General mineral analyses of ground-water samples conducted during the last four years indicated <br /> that the ground water beneath the area is hard to very hard with intermediate 'electrical <br /> conductivity (EC) and total dissolved solids (TDS) values (Tchobanoglous, 1985), as shown in <br /> Table 2. Hardness values ranged from 230 to 360 mg/l (Figure 10), and EC values ranged from <br /> i <br /> LUF400RFF fi SCALMA^ INI <br /> 4 <br />