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Mr. Karl C. Koehler December 10, 1992 Page 2 The monitoring results from all four visits are provided in Attachment 2. Each hydrologic feature is presented on a separate page and includes the following information, where applicable: • Estimate of size; • Appazent source of surface water (if known); • General location reported as Township, Range and Section; • Man-made or natural; and • Water quality parameters. Recommendations for Future Hydrologic Monitorine for the Permit Expansion Are One of the main objectives for surface water monitoring within the current permit azea and the proposed expansion azea is to detect any impacts to the surface water hydrology due to subsidence from subsurface mining operations. The following recommendations were made in the 1991 Annual Hydrologic Report for the Orchard Valley Mine with respect to future monitoring of the current permit azea: "Water quality data should only be collected at selected springs. Only those springs which discharge continuously throughout each summer should be sampled." "Only flow rate should be collected from other springs monitored and only pond level data should be collected from each pond." "All springs which do not flow continuously and have never Flowed more than 0.02 cfs (cubic feet per second) should be dropped from the program." Simon-Hydro Search believes this value is too large since no springs in the study area have been observed to discharge at .02 cfs (9.0 gallons per minute) or greater. Flow rate should be measured from each spring with a flow rate greater than .002 cfs or approximately one gallon per minute (gpm). "Monitoring of all springs, ponds and surface water stations should be conducted during the Spring, Summer and Fall." "Ponds and springs should be monitored for level or flow monthly with annual full suite analyses (in the fall) and monthly field parameters measured at only a few selected stations."