2007-11-07_HYDROLOGY - M1977300

• Permit No: M1977300
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/7/2007
• Doc Name: Hydrologic evaluation of mine closure & reclamation
• From: Whetstone Associates
• To: Cotter Corpoartion
• Media Type: D
• Archive: No

Schwartzwalder Mine -Hydrologic Evaluation of Mine Closure and Reclamation 46
Table 20. Determination of Hardness Values Used in Calculating Hardness-Based Aquatic
Standards
Pre sum shut-off
Calculated
Harduess,
mg/L as
Date CaCO3 Post sum shut-off
Calculated
Harduess,
mg/L as
Date CaCO3 Post sum shut-off, low flow
Calculated
Harduess,
mg/L as
Date CaCO4
10/20/98 149 6/25/02 194 12/31/02 352
11/19/98 153 12/31/02 352 1/31/03 305
12/17/98 121 1/31/03 305 2/27/03 222
1/19/99 123 2/27/03 222 7/29/03 258
2/15/99 160 3/26/03 112 7/31/03 146
12/21/00 108 4/29/03 46 9/26/03 165
1/29/01 172 5/22/03 49 10/31/03 138
2/28/01 119 6/23/03 88 11/25/03 112
3/27/01 89 7/29/03 258 12/16/03 123
4/18/01 69 7/31/03 146 1/23/04 123
5/29/01 68 9/26/03 165 2/25/04 93
6119/01 115 10/31/03 138 7/29/04 86
7/11/01 110 11/25/03 112 8/30/04 76
8/24/01 153 12/16/03 123 9/29/04 90
9/17/01 121 1/23/04 123 7/31/05 221
10/24/01 137 2/25/04 93 8/30/05 214
11 /27/01 128 3/30/04 103 11 /30/05 138
12/18/01 126 4/28/04 69 12/31/05 103
1 /22/02 166 5/31 /04 117 2/27/06 123
2/26/02 202 6/29/04 106
3/26/02 115 7/29/04 86
4/24/02 111 8/30/04 76
5/28/02 104 9/29/04 90
3/22/05 93
5/31/05 62
6/22/05 73
7/31/05 221
8/30/05 214
11/30/05 138
12/31/05 103
2/27/06 123
3/29/07 72
Avera e: 127 Avera e: 133 Avera e: 163
4109B.071116 Whetstone Associates •