2008-05-06_REPORT - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: REPORT
• Doc Date: 5/6/2008
• Doc Name: 2007 AHR Appendix A & B
• From: Seneca Coal Company
• To: DRMS
• Annual Report Year: 2007
• Permit Index Doc Type: Hydrology Report
• Email Name: DTM
• Media Type: D
• Archive: No

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TABLE 7
Summary of Surface Water Monitoring Sites, Yoast Mine
Site Location and Period of
Number Elevation Operation Comments
YSSF1 Middle Sage Creek 01/81-10/83 2.5 ft. wide (2.0 ft. deep) Parahall flume w/continuous

~ 7216 feet recorder, monitors downstream of Yoast Mine. Data for this
(SN87W18CDD) for this site contained in USGS Open-File Report 90-708.
Discontinued 10/83, flume relocated to Site YSSF3 (see
above) summer 1990. Replaced by Site YSS2 (see below) in
5/91
YSSF2 Y1 Pond, Tributary to Sage Creek 03/91-10/99 1.0 ft. wide (1.5 ft. deep) Parahall flume w/continuous
7256 feet flow recorder, monitors discharge of Y1 Pond (renamed to
(SN87W19BAA) NPDESI2 11/99).
' YSSF3 Upper Sage Creek 09/90-present 2.5 ft. wide (2.0 ft. des Par
p) shall flume w continuous flow
7409 feet recorder, monitors upstream of Yoast Mine
(5N87W30BHA)
WSSF3 Lower Sage Creek 09/90-present 3.0 ft. wide (2.5 ft. deep) Parahall flume w/continuous
6857 feet flow recorder, monitors downstream of both Yoast and
' (SN88W11ACC) Seneca ZI-W Mines (not now required for Yoast monitoring)
YSS2 Middle Sage Creek OS/91-present No instrumentation, replaces Site YSSF1 (see above),
7218 feet located approx. 150 ft. upstream of Site YSSF1 due to
(SN87W18CDD) beaver dame
YSS3 Y1 Draw, Tributary to Sage Creek 05/91-10/93 No instrumentation, monitors inflow to Y1 Pond
7265 feet 5/98-10/98 Discontinued 11/1999.
(SN87W19ABB)
YSA4 Annand Draw Tributary 06/94-08/96 No instrumentation, monitors Annand Draw below NPDESI0 site,
to Grassy Creek discontinued 1996 upon completion of that pond.
6780 feet
(SN87WSABD)
YSAF4 Annand Draw, Tributary to Grassy 05/91-06/96 1.5 ft. wide (1.5 ft. deep) Parahall flume w/continuous
Creek flow recorder. Monitors baseline data only for Annand
6968 feet Draw downstream of proposed mining. Discontinued
i~ (SN87W8CD8) and replaced with YSA4
i YSGFS Grassy Creek 04/91-present 2.0 ft. wide (2.0 ft. deep) Parahall flume w/continuous
6905 feet flow recorder. Monitors downstream of minor disturbances
(SN87W16DAA) by Yoast Mine in Grassy Creek basin. Will discontinue
continuous flow recorder starting in 1994
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