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Zn0001 = e ~In(Znccmll Where: (5) In(Zncco~) =the natural logaritlun of predicted dissolved zinc concentration (in ug/L) at 0001 In(flow) =natural logarithm of stream flow (in cfs) at CCO1 Rise = 1 if the flow is taken during the months of June, July or August, and 0 if it is not Zncco~ =the predicted dissolved zinc concentration (in ug/L) at CCO1 e =base of the natural logarithm (b) The results are shown in Table A-3. The "R-Sq(adj)" has a value of 68.1 %, which means that 68 percent of the variability in dissolved zinc concentration at CC-O1 is accounted for by the ln(flow) at CC-O1 and whether or not the sampling occurred during June, July or August. Table A-3. Regression Results for the Zinc Concentration at CC-Ol The regression equation is ln(Znccat) = 1.380 - 0.159 hi(flo w) + 0.336 rise Predictor Coef St Dev T P Constant 1.38171 0.03525 39.20 0.000 ln(flow) -0.15891 0.04141 -3.84 0.001 Rise -0.33616 0.08655 -3.88 0.00 S = 0.1779 R-Sq = 69.9% R-Sq(adj) = 68.1 Calculation of Expected Water Quality at A-72 At the time of application for termination of Agreement, SGC will select the last 36 months of data (flow and dissolved zinc at A-72 and flow at CCO1), and calculate the expected water quality at A-72 as follows: • ror each month, the expected CCO1 load will be added to the actual ]oad at A-72. The expected CC01 concentration will be based on the regression equation (4) arrd (5) above, the actual flow at CCO 1, and whether the data was collected during the "Rise." Concentration and flow will be used to calculate a CCO1 load. This represents the zinc load from the Upper Cement Creek Basins that has been removed during the project period by diversion and treatment of Cement Creek in the American Tunnel Treatment Plant. Appendix A 232565