REP36801

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: 2000 AHR - Sylvester Gulch Discharge
• Annual Report Year: 2000
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

Doc Date:1 211 112 0 0 1

I
Mountain Coal Company
West Elk Mine
Comparative Analysis
Sylvester Gulch Discharge
III IIIIIIIIIIIII III
99s
Sample Point Date' TDS TSS SS pH Cond. Fe(T) Fe(D)
017 7/20/00 3130 18 8.64 4020 5.87 0.05
7/28/00 3751 18 7.93 5310 2.31 0.03
8/1/00 3597 26 8.29 5030 1.70 0.01
8/4/00 3948 14 <0.1 7.92 5370 2.41 0.06
8/10/00 4067 25 0.1 7.91 5890 2.06 0.01
8/16/00 3610 21 <0.1 7.82 5330 1.66 0.01
8/24/00 3198 14 <0.1 7.88 4680 0.88 0.14
9/4/00 2840 20 <0.1 8.08 4570 1.01 0.06
9110/00 2700 29 <0.1 7.81 4040 1.11 0.07
9/16/00 2900 29 <0.1 7.68 4200 1.04 0.17
9/26/00 2700 15 <0.1 7.90 3770 1.04 0.06
10/6/00 2400 31 <0.1 7.87 3640 0.91 0.02
10/16/00 2500 10 <0.1 7.95 3820 1.13 D.O5
10/27/00 2400 8 <0.1 8.30 3680 1.06 0.09
11/8/00 2200 28 <0.1 7.99 3300 1.00 0.06

Rip-Rap Channel 10/6/00 2300 46 <0.1 8.41 3680 1.65 0.01
10/16/00 2500 25 <0.1 8.52 3840 2.19 0.03
10/27/00 2500 59 <0.1 8.87 3630 2.03 0.06
11 /8/00 2000 77 <0.1 8.61 3300 2.92 0.05

RPE Crossing 8/4/00 3840 1110 1.3 8.74 5280 16.9 0.04
9/4/00 2870 880 1.0 8.92 4520 21.1 1.16
9/10/00 2664 115 <0.1 8.75 4020 8.43 0.25
9/16/00 3000 960 1.5 8.62 4100 31.1 0.08
9/26/00 2400 310 0.3 8.77 3780 8.90 0.31
10/6/00 2400 190 0.1 8.63 3640 8.63 0.03
10/16/00 2400 120 <0.1 8.70 3830 6.86 0.04
10/27/00 2200 390 0.2 9.03 3620 6.34 0.07
11/8/00 2200 210 0.1 8.81 3320 8.55 0.05

Upstream Gunnison 8/7/00 96 <5 <0.1 7.63 171 0.19 0.02
8/29/00 130 64 0.1 7.96 221 2.76
9/4100 99 <5 <0.1 8.25 186 0.3 0.22
9/10/00 107 11 <0.1 6.99 162 0.67 <0.01
9/16/00 110 5 <0.1 7.73 160 0.15 0.04
9/26/00 140 20 <0.1 7.63 173 0.43 0.12
10/6/00 85 <5 <0.1 7.14 139 0.08 <0.01
10/16/00 96 <5 <0.1 7.01 171 0.19 <0.01
10127/00 130 6 <0.1 8.02 169 0.15 <0.01
11/8/00 100 <5 <0.1 8.08 191 0.12 <0.01

Downstream Gunn. 8/7/00 224 72 <0.1 8.09 381 2.53 0.02
9/4/00 280 46 <0.1 8.66 522 1.41 0.04
9/10/00 279 46 <0.1 7.96 453 0.63 0.01
9/16/00 300 91 <0.1 8.12 490 2.22 0.03
9/26/00 290 35 <0.1 8.29 439 1.14 0.07
10/6/00 270 10 <0.1 8.01 444 0.34 <0.01
10/16/00 280 14 <0.1 8.15 468 0.70 0.01
10/27/00 300 29 <0.1 8.58 440 0.80 <0.01
11/8/00 350 27 <0.1 8.64 542 1.00 <0.01
' 7/20/00 to 9/16/00 Analyses prior to Channel Maintenance and Erosion Control Project, MR-271, Completed 9/20/00