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Section 780.21(c) Continued. <br />(x, y) _ <br />b = <br />u = <br />«c = <br />Revised 11/20/80 <br />coordinates of C/Co on east-west (x) <br />and north-south (y) axes, in feet Q = <br />volume of flow per time at point (x, <br />y) equal to PIA (P = aquifer per- <br />meability, I = piezometric surface <br />gradient, A = cross-sectional area of <br />flow) in cubic feet per day <br />aquifer thickness, in feet <br />ground water flow velocity, equal to <br />PI/~Q (P = aquifer permeability, I = <br />piezometric surface gradient, Q = <br />aquifer porosity = 0.20) in feet/day <br />specific longitudinal dispersivity, <br />equal to 2.63 P 0'6 u -0.2 in feet <br />OCT = specific transverse dispersivity, <br />equal to 6.049 p0.35 a -0.3~ in feet <br />Ko = modified Bessel function of the first <br />kind zero order. <br />This equation yields the solute concentration above the baseline <br />level at a point some distance away from the mine plan area. <br />Solute concentrations were computed for distances of 2000, 4000, <br />and 8000 feet from the mine plan area as 357.2 mg/1, 79.3 mg/1 and <br />1.5 mg/1, respectively. As indicated by these values, solute <br />concentrations above the baseline level will not be measureable <br />more than 8,000 feet away from the mine plan area. <br />It should be noted that dilution and dispersion of the salt plume <br />will probably make any real contribution of dissolved salts im- <br />measureable. Samples of affected ground water gathered from three <br />wells immediately down-gradient of the existing Marr Mine are <br />presented in a trilinear diagram shown in Figure 23, Kerr Affected <br />Ground Water Quality. A comparison of this diagram <br />780-122 as <br />