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0 0 0 <br />TABLE 7 <br />Summary of Surface Water Monitoring Sites, Yoast Mine <br />Site <br />Number Location and <br />Elevation Period of <br />Operation <br />Comments <br />YSSFS Middle Sage Creek 01/81-10/83 2.5 ft. wide (2.0 ft. deep) Parshall flume w/continuous <br /> 7216 feet recorder, monitors downstream of Yoast Mine. Data for this <br /> (5N87Wi8CDD) for this site contained in USGS Open-File Report 90-708. <br /> Discontinued 10/83, flume relocated to Site YSSF3 (see <br /> above) summer 1990. Replaced by Site YSS2 (see below) in <br /> 5/91 <br />YSSF2 Y1 Pond, Tributary to Sage Creek 03/91-10/99 1.0 ft. wide (1.5 ft. deep) Parshall flume w/continuous <br /> 7258 feet flow recorder, monitors discharge of Yl Pond (renamed to <br /> (5N87W19BAA) NPDESI2 11/99). <br />YSSF3 Upper Sage Creek 09/90-present 2.5 ft. wide (2.0 ft. deep) Parshall flume w/continuous flow <br /> 7409 feet recorder, monitors upstream of Yoast Mine <br /> (5N87W30BBA) <br />WSSF3 Lower Sage Creek 09/90-present 3.0 ft. wide (2.5 ft. deep) Parshall flume w/continuous <br /> 6857 feet flow recorder, monitors downstream of both Yoast and <br /> (5N88WIlACC) Seneca II-W Mines (not now required for Yoast monitoring) <br />YSS2 Middle Sage Creek 05/91-present No instrumentation, replaces Site YSSFS (see above), <br /> 7218 feet located approx. 150 ft. upstream of Site YSSF1 due to <br /> (5N87W18CDD) beaver dame <br />YSS3 Y1 Draw, Tributary to Sage Creek 05/91-10/93 No instrumentation, monitors inflow to Y1 Pond <br /> 7265 feet 5/98-10/98 Discontinued 11/1999. <br /> (5N87W19ABB) <br />YSA4 Annand Draw Tributary 06/94-08/96 No instrumentation, monitors Armand Draw below NPDES10 site, <br /> to Grassy Creek discontinued 1996 upon completion of that pond. <br /> 6780 feet <br /> (5N87WSABD) <br />YSAF4 Annand Draw, Tributary to Grassy 05/91-06/96 1.5 ft. wide (1.5 ft. deep) Parshall flume w/continuous <br /> Creek flow recorder. Monitors baseline data only for Armand <br /> 6968 feet Draw downstream of <br />proposed miming. Discontinued <br /> (SN87W8CDB) and replaced with YSA4 <br />YSGFS Grassy Creek 04/91-present 2.0 ft. wide (2.0 ft. deep) Parshall flume w/continuous <br /> 6905 feet flow recorder. Monitors downstream of minor disturbances <br /> (5N87W16DAA) <br />by Yoast Mine is Grassy Creek basin. Will discontinue <br /> continuous flow recorder starting in 1994 <br />r? <br />v.