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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 drainage during the 1998 -2002 term and will continue through the current permit <br />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 report will be provided to the Division detailing the results of the surface <br />water sampling at Trapper for the previous year. The report will include data from all the NPDES <br />discharge sites and the ongoing spring monitoring program in effect. Appendix W will be updated to <br />contain each annual report. <br />4 -241 a <br />1v kw <br />