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. compared to prior years, or fluctuate as a result of annual precipitaxion changes. TDS <br />values at Hells 46-A and 21-LHI have decreased this year. <br />Surface Hater <br />Table 15 (Appendix A) lists pertinent information on all NPDES, stream, and spring <br />monitoring sites at the Seneca II Mine. NPDES Discharge Points 002, 003, 004, and 008 are <br />monitored weekly for flow and field parameters (pH, conductivity, and temperature). <br />Monitoring for total suspended solids, total iron, total dissolved solids, oil and grease, <br />and floating solids is performed in accordance with the terms and frequencies stipulated <br />in NPDES Permit N0. (0-0000221. Flow at Sites NPDES 002 and 003 is monitored continuously <br />through the year via H-flumes with Stevens Type F water level recorders; flow at Sites <br />NPDES 004 and 008 is monitored continuously via Parshall flumes equipped with Stevens Type <br />F water level recorders. The only time of the year during which flow is not monitored <br />continuously is during the winter months when the stilling cells are frozen. <br />Stream Monitoring Sites SH-52-1, 2, 5, and 6 are monitored monthly for instantaneous floe <br />and field parameters from March through October. Crest stage gages are located at each of <br />the stream sites. All crest stage gages are used to record peak flow Stage hel gh ts. Peak <br />flows are then calculated by incorporating these peak floe stage values and channel survey <br />data (stream cross section and slope) into the Manning's Equation. Appendix F of this AHR <br />contains the most recent versions of rating curves developed for [he cresC stage gages. <br />All of the NPDES end stream monitoring Sites 1, 2, 5, and 6 are sampled three limes a year <br />for water quality. The first Sample of the year is Collected prior to peak runoff <br />(March); the second sample is collected after peak runoff (May or June); and the third <br />Sample iS Collected during base flow conditions (September}, Samples collected at all <br />these sites were analyzed using the surface water long list, Table 16 (Appendix A). <br />Four new surface water sixes were added at Seneca II in 1987. Site SH-52.10 is at the <br />mouth of Low Camp Creek, Site SH-S2-11 is on Fish Creek upstream of the confluence with <br />Cow Camp Creek, Site SH-S2-12 is at the mouth of Bond Creek and Site Sw-52-13 is on Fish <br />Creek downstream of [he confluence with Bond Creek. They were monitored monthly during <br />the 1990 eater year from May to September. Samples collected at these sites in May, June, <br />and September were analyzed using the Long list. The surface eater short List, Table 17 <br />(Appendix A) was used t0 analyze samples collected in July and August. <br />11 <br />