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where: <br />CC ioaa= Znccoi * flow *0.0054 (8) <br />and Zncco~ is calculated using equations (4) and (5) above. <br />The expected zinc concentration at A72 is calculated by dividing the expected load by the actual <br />flow at A72 and a unit conversion factor. <br />expZn ~oo~ =expZn ioaa _ (flow * 0.0054) (9) <br />(c) Comparison of Expected Water Quality and Baseline Water Quality at A-72 <br />Comparison of Expected Water Quality and Baseline Water Quality at A-72 will be done <br />with a regression equation having three explanatory (X) variables: Streamflow, Rise, and <br />`After', where `After' has a value of 1 if the data belong to the Expected data set and 0 if <br />the data belong to the base]ine data set. The response (Y) variable will be the natural <br />logaritlun of dissolved zinc in the baseline data set and the natural logarithm of the <br />expected dissolved zinc concentration [equation (9)]. The regression equation will have <br />the form of: <br />ln(ZnA~Z) = t11 + Q * In(flow) + b * Rise + C * After (10) <br />Where: <br />-n(ZnA_~z) =the natural ]ogaritlun of the new predicted dissolved zinc <br />concentration (in ug/L) at A-72 <br />t11 =the constant or intercept of the equation <br />Q =the coefficient for the natural logaritlun of stream flow (in cfs) <br />at A-72 <br />In(flow) =natural logarithm of stream flow (in cfs) at A-72 <br />b =the coefficient for the "Rise" factor <br />Rise = 1 if llie flow is taken during the rising limb of the hydrograph and <br />0 if it is not <br />C =the coefficient for the "After" factor <br />After = 0 if the flow is from the baseline data set and I if it is from the last <br />36 months. <br />A t-test will be performed to determine whether this 0(1 Before(After difference is <br />significant, over and above the effects of Streamflow and rising limb, the other two <br />variables in the equation. The t-test will be performed for each of the variables to <br />determine whether or not the coefficient value is significantly different from zero. If so, <br />that variable has an affect on the magnitude of the Y variable (the logarithm of zinc <br />concentration). If not, (if the coefficient value is basically equal to zero) there is no effect <br />Appendix A <br />10 <br />232565 <br />