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This approach ofplotting standardized residuals showing the degree of departure of actual Zn <br />concentration from predicted concentrations can be used not only for the baseline data set but <br />also to track progress during the project period <br />A-3 Method for Evaluating Wafer Quality 1>uring the Project Period with Respect to the <br />Reference Water Quality <br />(a) 1;ach month during the project period, SGC will collect awater-quality sample at Station <br />A-72. Analysis shall be conducted according to test procedures approved under 40 CFR <br />Part 136, wiles other test procedures have been.approved by the Division. SGC will <br />obtain the stream flow datwn that applies to the relevant sampling event from the US <br />Geological Survey data collection system. In the event that the stream gage at A-72 is <br />frozen and/or inoperable, yet a water sample is obtained, flow may be estimated. <br />(b) SGC will report the flow value and the dissolved zinc value in a written submittal to <br />WQCD. The submittal will be presented together with the next monthly Discharge <br />Monitoring Report that is due to WQCD following receipt by SGC of the laboratory <br />report for the dissolved zinc value. Records of monitoring information shall include: <br />• The date. exact place, and time of sampling or measurements; <br />• the individual(s) who performed the sampling or measurements; <br />• the dates the analyses were performed; <br />• the individual(s) who performed the analyses; <br />• the analytical techniques of methods used; and <br />• the results of such analyses. <br />Appendix A <br />6 <br />232565 <br />Figure A-3. Zinc Standardized Residuals (actual minus predicted) for Baseline Data Set <br />