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Seneca II West, C1982-057, RN6, PAR <br />41Page <br />permit commitment. PAP, Tab 15. The parameters of concern are applicable to both <br />groundtivater monitoring and surface water monitoring. <br />SP responded that they are aware of this commitment and have conducted monitoring <br />accordingly. This response is acceptable. <br />9. Evaluation of hydrologic data from quarterly DMRs and AHRs to calculate yearly <br />averages for parameters sampled at CDPS discharge points, the Division finds that the <br />two datasets generate different results. Averages ofpararneters such as.flow, pH, and <br />total dissolved solids are presented in the data (or calculated by the Division), and these <br />averages rrucuy differ by as much as 10 percent between a DMR and an AHR. Please <br />explain why the results fi-orn the hvo datasets are not equal. <br />SP's response regarding the difference between the reported values is acceptable. <br />10. Tab 17, page 17 of the PAP. The Division's copy of this page shows that there <br />have been hand written corrections to the values used in the equations of this <br />section. Please review this section and provide corrected values. <br />SP resubmitted page 17 of Tab 17, with the same error included. <br />The Division restates its concern regarding this prediction in the PHC: <br />A) In the Probable Hydrologic Consequences section (PHC Tab 17), page 17 includes a prediction of <br />the impact of mine discharges on Dry Creek. The text states that the aquifers combined will <br />produce an estimated 4,806,953 gal/day into the mine pits, and this will be discharged to Dry <br />Creek. This very large value is used in calculations in the PHC Please identify the source of the <br />value of 4,806,953 gal/day. <br />B) Based on 4,806,953 gal/day, the calculated value of 0.02 cfs appears to be incorrect. The <br />Division has calculated 4,806,953 gal/day to equal 7.44 cfs. This should be corrected on <br />page 17 of the PHC, and the related calculations (based on this flow rate) revised <br />accordingly. <br />'! \q 'S, f.r4 <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 "? <br />