REP17219

• Permit No: C1982056
• IBM Index Class Name: Report
• Doc Date: 12/5/2002
• Doc Name: 2002 AHR Tables 46-80
• From: Twentymile Coal Company
• To: DMG
• Annual Report Year: 2002
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

TABLE 56
TWENTYMILE COAL COMPANY
2002 ANNUAL HYDROLOGY REPORT
• SUMMARY OF FLOW RATE DATA
SURFACE WATER MONITORING SITES:
STATION 2002 MEAN FLOW MAX FLOW MIN FLOW PERIOD
STATION LOCATION NUMBER IRRIG. PERIOD•• HISTORIC 2002 HISTORIC 2002 OF
(cfs) (cfs) (cfs) (c@) (cfs) RECORD
FO/DEL CREEK
AT ECKMAN PARK 800 0.17 56.00 6.96 0.00 0.00 0376 -09/02
BELOW MINE I 8 0.0$ 52.00 0.47 0.00 0.00 07!79 -09/02
ABOVE MINE3 900 0.05 90.00 2.10 0.00 0.00 0985 -09/02
FlSN CREEK
UPSTREAM 1001 NA 120.00 NA 0.00 NA 04/82 - 01/87
UPSTREAM 16/16A 1.40 180.00 30.40 0.08 0.29 03/79-09/02
BELOW SITE I IS 302 2.52 70.00 4.92 0.03 1.20 07/90 -09/02
BELOW MINE 2 1002' 17.60 198.00 39.00 0.00 0.00 03/79 -09/02
ABOVE FISH CRK TIPPLE 27A• 9.10 226.70 7L60 0.00 0.00 OI/SI -09/02
DOWNSTREAM 1003• 0.02 272.00 6.65 0.00 0.00 04/82 -09/02
TROUT CREEX
ABOVE MIDDLECREEK 301 4.50 165.00 6.50 1.00 3.80 01/87-09/02
BELOW MIDDLE CREEK 69 11.33 413.25 05.00 0.14 L00 03/79 -09/02
DOWNSTREAM 1005 7.11 239.00 77.50 0.82 0.82 03/94 -09/02
M1ODL£ CREEX
UPSTREAM MC-1 0.01 4.30 L51 0.004 0.004 OSN6 -09/02
DOWNSTREAM 700 0.18 94.00 13.46 0.00 0.00 09/75 -09/02
D/SCHARGE S/TE
P/SH CREEK T/PPLE
-
POND E 62 0.03 0.65 0.18 0.00 0.01 03!19 -09/02
•
DISCHARGE SITES;

EAR TOTAL
U.G. MINE
109+115
(cfs) FISH CREEK
BOREHOLE
115
(cfs) ~ FOIDEL CREEK
PORTAL
109
(cfs) POND D

84
(cfs) WASTE ROCK
POND
7
(cfs)
1983 -- ---- ----- 0.51 0
1984 0.19••• ---- 0.19••• 0.13 0
1985 0.23 ---- 0.23 0.61 0.24
1986 0.22 ----- 0.22 1.19 0.44
1987 0.34 ----- 0.34 0.31 0
1988 0.37 ---- 0.37 0.35 'r'•
1989 0.33 ----- 0.33 0.45 0
1990 0.27 0.16 0.11 O.IJ 0
1991 o.zl o.ls o.06 a.n o
1992 0.42 0.20 0.22 0.23 0.10
1997 0.53a 0.23a 0.30a 0.39 0.30
1994 0.34 0.14 0.20 0.19 0.10
1995 0.25 0.14 0.11 0.17 0.04
1996 0.09 0.06 0.0J 1.06 0.12
1997 0.00 0.00 0.00 1.04 0.42
1998 0.256 0.256 0.00 0.70 0.84
1999 0.42 0.31 0.12 0.71 0
2000 0.81 0.52 0.29 0.11 0
2001 0.12 0.12 0.00 0.02 0
2002 O.I4 0.14 0.00 0.02 0
N TE ;
• SUBSIDENCE OVER I3 RT PANEL, CONTRIBUTED TO NO FLOW AT THESE SITES FROM IDLY-SEPTEMBER 2002.
•• IRRIGATION PERIOD IS TUNE THROUGH SEPTEMBER
. ::• AVERAGE RATE FROM BEGINNING OF MEASURED MINE DISCHARGE ON MARCH 19, 1984
•• FLOWED FOR SHORT PERIOD DURING MAY 1988
a REFLECTS 1ST PANEL SOUTH DEWATERING ACTIVITIES
b FLOWED DURING AUGUST AND SEPTEMBER, 1998
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