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TABLE 15-2 <br />Summary of Surface Water Monitoring Sites, Yoast Mine <br />Site <br />Number Location and <br />Elevation period of <br />Operation <br />Comments <br />YSSF3 Uppei Sage Creek 09/90-pzeaent 2.5 ft. xida (2.0 ft. deep) Parshall flume w/continuous flow <br /> 1609 feat recorder, monitors upstream of Yoast Mine <br /> (SNB7W30BSA) <br />......~ ddle Saga C.an. ~ Oi%8i-i0%B! 2.5 ft. wide (2.0 f[. deep) Parshall flume w/continuous <br /> 7216 feet recorder, monitors downstream of Yoast Mine. Data for this <br /> (SN87W18CDD) for this site contained in USGS Open-File Report 90-708. <br /> Discontinued 10/B3, flume relocated to Site YSSF3 lase <br /> above) summer 1990, Replaced by Site YS52 (see below) zn <br /> ii 9i <br />YS92 Middle Saga Creek 05/91-present No instrumentation, replaces Site YSSFl (see above), <br /> 7218 feet located approx. 150 ft. upstream of Site YSSF1 due to <br /> (5N87 W18COD) beaver dame <br />wSSF3 Lower Sage Creek 09/90-present 3.0 ft. ride 12.5 ft. deep) Parshall flume w/continuous <br /> 6857 feet flox recorder, monitors downstzeam of botD Yoast and <br /> (SNB8W11ACC) Seneca II-W Mines <br />YSSF2 Y1 Pond, Tzibutary to Sage Creek 03/91-present 1.0 ft. wide (1.5 ft. deep) Parshall Flume w/continuous <br /> 7258 feet flow recorder, moni to re discharge of Y1 Pond (will be zenamed to <br /> 15N87W19BAA) NPDE512 upon its completion). <br />Y SS3 Y1 Draw, Tributary to Sage Creek 05/91-1999 No instrumentation, monitors influx to Y1 Pond <br /> 7265 feet Discontinued 1999. <br /> (SNB7 W19A88) <br />YSAF4 Armand Draw, Tributary to Grassy 05/91-06/96 1.5 ft. wide (1.5 ft. deep) Parshall flume w/continuous <br /> Creek flow recorder. Moni to re baseline data only for Armand <br /> 6968 feet Draw downstream of proposed mining. Discontinued <br /> (5N87WBCD8) and replaced with YSA4 <br />YSGFS Graeay Creak 09/91-prasont 2.0 fem. wide (2.0 ft. deepi parshaii flume wj continuous <br /> 6905 feet flow recorder. Monitors downstream of minoz disturbances <br /> (5NB7W16DAA) by Yoast Mine in Grassy Creek boson. Will discontinue <br /> continuous flow xeoorder starting in 199E <br />YSA4 Armand Draw Tributary 06/94-08/96 No instrumentation, monitors Armand Draw below NPDESIO ai te, <br /> to Graeay Creek discontinued 1996 upon completion of that pond. <br /> 6780 feet <br /> _ _ (SN87WBABD) _ - - - - - - - - - - - - - - <br /> ® <br /> 4 Revised 2/99 <br />