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8.0 VERTICAL GRADIENTS <br /> Vertical gradients were calculated for "A" to "B" zones, "B" to "C' zones, and "C" to "D" zones. <br /> Vertical gradients were calculated using the following method: the difference between <br /> groundwater elevations from shallow and deeper zone wells divided by the distance between <br /> the center of the water column of the shal ow zone well and the center of the water column of <br /> the deeper zone well. Positive vertical gradients denote downward flow; negative vertical <br /> gradients denote upward flow. Historical vertical gradient data is presented in Table 6. <br /> 8.1 "A" to "B" Zone Vertical Gradients <br /> Vertical hydraulic gradients between the "A" zone and "B" zone were approximately <br /> 0.251 ft/ft in well pair AR/MW-1A and AR/MWAB, 0.041 ft/ft in well pair TS/MW-1A and <br /> TS/MW-1B, and 0.207 ft/ft in well pair PS/WC-1S and PS/WC-1 M. <br /> 8.2 "B" to "C" Zone Vertical Gradients <br /> Vertical hydraulic gradients between the "B zone and "C" zone were approximately 0.061 ft/ft in <br /> well pair AR/MW-11B and AR/MW-11C, 0.028 ft/ft in well pair TO/WCAM and TO/WC-1C, and <br /> 0.112 ft/ft in well pair TS/MW-IB and TS/M -1 C. <br /> • 8.3 "C" to "D" Zone Vertical Gradien <br /> Vertical gradients between the "C" zone and "D" zone were 0.013 ft/ft in well pair TS/MW-1C <br /> and TS/MWA D, and 0.075 ft/ft in well pair AR/MW-14C and AR/MW-14D. <br /> • <br /> STTC 1006 Final Report 16 May 1,2006 <br /> 770T.43673.12.0002 <br />