Laserfiche WebLink
TABLE 9 <br />Summary of Surface Water Monitoring Sites, Yoast Mine <br />Site <br />Number <br />Location and <br />Elevation <br />Period of <br />Operation <br />Comments <br />YSSF1 <br />Middle Sage Creek <br />01/81-10/83 <br />2.5 ft. wide (2.0 ft. deep) Parshall flume w/continuous <br />7216 feet <br />recorder, monitors downstream of Yoast Mine. Data for this <br />(5N87W18CDD) <br />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 <br />Y1 Pond, Tributary to Sage Creek <br />03/91-10/99 <br />1.0 ft. wide (1.5 ft. deep) Parshall flume w/continuous <br />7258 feet <br />flow recorder, monitors discharge of Yl Pond (renamed to <br />(5N87W19BAA) <br />NPDESI2 11/99). <br />YSSF3 <br />Upper Sage Creek <br />09/90 -present <br />2.5 ft. wide (2.0 ft. deep) Parshall flume w/continuous flow <br />7409 feet <br />recorder, monitors upstream of Yoast Mine <br />(5N87W30BBA) <br />WSSF3 <br />Lower Sage Creek <br />09/90 -present <br />3.0 ft. wide (2.5 ft. deep) Parshall flume w/continuous <br />6857 feet <br />flow recorder, monitors downstream of both Yoast and <br />(5N88W11ACC) <br />Seneca II -W Mines (not now required for Yoast monitoring) <br />YSS2 <br />Middle Sage Creek <br />05/91 -present <br />No instrumentation, replaces Site YSSF1 (see above), <br />7218 feet <br />located approx. 150 ft. upstream of Site YSSF1 due to <br />(5N87W18CDD) <br />beaver dams <br />YSS3 <br />Y1 Draw, Tributary to Sage Creek <br />05/91-10/93 <br />No instrumentation, monitors inflow to Y1 Pond <br />7265 feet <br />5/98-10/98 <br />Discontinued 11/1999. <br />(5N87W19ABB) <br />YSA4 <br />Annand Draw Tributary <br />06/94-08/96 <br />No instrumentation, monitors Annand Draw below NPDES10 site, <br />to Grassy Creek <br />discontinued 1996 upon completion of that pond. <br />6780 feet <br />(5N87W8ABD) <br />YSAF4 <br />Annand Draw, Tributary to Grassy <br />05/91-06/96 <br />1.5 ft. wide (1.5 ft. deep) Parshall flume w/continuous <br />Creek <br />flow recorder. Monitors baseline data only for Annand <br />6968 feet <br />Draw downstream of proposed mining. Discontinued <br />(5N87W8CDB) <br />and replaced with YSA4 <br />YSGF5 <br />Grassy Creek <br />04/91 -present <br />2.0 ft. wide (2.0 ft. deep) Parshall flume w/continuous <br />6905 feet <br />flow recorder. Monitors downstream of minor disturbances <br />(5N87W16DAA) <br />by Yoast Mine in Grassy Creek basin. Will discontinue <br />continuous flow recorder starting in 1994 <br />