Laserfiche WebLink
3 <br /> This change in direction of flow (to a more easterly direction) generally continued into 1998, as seen <br /> e, in the ground-water elevation contour map for May 1998 (Figure 7). During 1999 and 2000, shallow <br /> ground-water levels have declined gradually across the area but have generally maintained an east- <br /> southeasterly flow direction, although with a flattened gradient during the fall (Figures 8 and 9): <br /> n <br /> The contour maps were prepared without including the observed water levels from the deep South <br /> Tracy#1 or Brown's#1 wells because they are representative of the deep ground water zone. Also, <br /> the observed water levels from the Petz well, which is completed in both shallow and deep zones of <br /> the underlying aquifer,were not used in preparing the contour maps. Until mid-1998, the Petz well <br /> water levels had been in an intermediate elevation range between those measured in wells solely <br /> completed in the shallow or deep zones; those measurements have typically represented a <br /> "composite" of shallow and deep zone water levels and thus are invalid for use in contouring the <br /> shallow or deep ground-water levels exclusively. <br /> Ground-Water Quality <br /> - NO <br /> NE:'Iff'") <br /> General mineral analyses of ground-water samples conducted during the last seven years indicated <br /> that the ground water beneath the area is hard to very hard with intermediate electrical conductivity <br /> (EC) and total dissolved solids (TDS) values (Tchobanoglous, 1985), as shown in Table 2. Hardness <br /> values ranged from 230 to 364 mgll (Figure 10), and EC values ranged from 790 to 1,100 umho/cm <br /> with the highest EC values in samples from the shallow wells (Figure 11). Samples from all wells <br /> were of a similar sodium/calcium quality, but the proportions of major anions varied with aquifer <br /> depth. The shallow ground water appeared to be of a bicarbonate/chloride quality, such as shown by <br /> the Hall well analyses (Figure 12), while deep ground water appeared to be of a bicarbonate/sulfate <br /> quality as shown by the Brown's #1 well analyses (Collins, 1928; Piper, 1953; Hem, 1959) <br /> � (Figure 13). NO`E D <br /> SCAN <br /> In regard to other notable ground-water constituents, nitrate levels were elevated in both shallow and <br /> n deep well samples, with concentrations in the South Tracy#1 production well fluctuating alternately <br /> 8 <br /> © LUHDORFF & SCALMANINI <br /> C O N S LJ L T I N G ENCPNEERS <br />