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Currently, no major undisturbed drainage exists within the permit boundary. The Pyeatt drainage was <br /> disturbed during the 1988-1992 permit term. The Flume Gulch drainage was impacted with pond <br /> construction in Grouse, Sage and Oak Gulches during the 1993-1997 permit term. Mining activities <br /> commenced in the Flume, Deacon and Jeffway drainages during the 1998-2002 term and will continue <br /> through the current permit term. <br /> Several changes have occurred to the surface water monitoring program over the years. For instance, <br /> acidity was a parameter in our original monitoring scheme, but was determined not to be a meaningful <br /> parameter due to the normally alkaline pH values of the surface water. Acidity was therefore dropped <br /> from List A because it did not yield useful monitoring information. <br /> The frequency of sampling at each site was revised with TR-110. The sampling frequency was changed <br /> from a weekly interval to monthly for each NPDES outfall. Traditionally each flowing outfall was sampled <br /> on Tuesdays. Sampling will be conducted the first full week of each month for the parameters in Table <br /> 4.8-12 at the frequency listed in Table 4.8-11 to be compatible with Trapper's NPDES permit, C-0032115. <br /> In accordance with TR-48 "1989 Annual Report" approval, the following surface water sampling changes <br /> became effective: <br /> 1) Vanadium was dropped as a sample parameter in the A-1 list. <br /> 2) Radium 226 sampling was dropped from the A-1 list. <br /> 3) Trapper agreed to analyze surface water parameters for "Dissolved" and "Total Recoverable" as <br /> specified in permit Table 4.8-12. <br /> Zinc was added as a sample parameter to the A-3 list in Table 4.8-11 with PR-6. <br /> By March 15 each year, an Annual Hydrologic Report will be provided to the Division detailing the results <br /> of the surface water sampling at Trapper for the previous year. The report will include data from all the <br /> NPDES discharge sites and the ongoing spring monitoring program in effect. <br /> 4-241 a <br /> Revision: TR-126 <br /> Approved: <br />