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necessary, based upon all hydrologic data coilect•ed at the mine site during the current permit term. 't'he Division is concerned that as mining er.pands into the Moffat area, flow from backfilled mining pits into Trout Creek will likewise increase, thus potentially impacting the quality of the creek. The PHC and CHI5 should include a comparison of the worst case quality/quantity of the spoils discharges to the predicted low flow of Trout Creek. If it is determined that mining will impact downstream uses of Trout Creek or of adjudicated use of alluvial water associated with the creek, a mitigation plan should also be submitted. If, during the course of thi=_ investigation, it is determined that further study of the problem is required, a detailed study proposal will should be submitted to the Division by September 2, 1°86. sA REVIEW/COMPARISON OF THE ORIGINAL PHC AND CHIS FOR THE WEST RIDGE AREA AND DATA COLLECTED OVER THE PREVIOUS PERMIT TERM INDICATES THE ASSUMPTIONS AND PREDICTIONS AS PRESENTED IN THE PERMIT ARE STILL VALID AT THIS TIME. NG CHANGE IN THE PERMIT TEXT IS REQUIRED SY THIS COMMENT. • E. Pittsburg and Midway should submit to the Division an Annual Hydrologic Report (AHR) which details the hydrologic monitoring at the mine site during a standard water year (October 1 thru September 30). This report should be submitted to the Division no later than January 15 of the following year. To eliminate confusion, the AHR will be submitted to the Division during the spring of each year (prior to June 1). The AHR should be divided by discipline (Ground Water and Surface Water sections), and further subdivided into quality and quantity sections. The following is a suggested format for the AHR: 1. Surface Water a. A tabulation of NPDE5 monitoring at each permitted discharge point during the reporting period. b. A summation of sediment level surveys performed at each pond during the year, as applicable, and a short 3iscussion pertaining to the condition of conveyance ditches at the mine site. c. A tabulation of all surface water data collected at the Oak Creek and Trout Creek monitoring sites. Water quality data should include minimum, maximum, mean, and standard deviation values for each parameter monitored. Discharge data is best presented in hydrograph form (i.e.: Time vs. Discharge and /or Gaqe Height vs. Discharge Graphs).