2010-05-07_PERMIT FILE - C2009087A ‎(18)‎

• Permit No: C2009087A
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Mitigation of the Impacts of Mining Operations
• Section_Exhibit Name: 2.05.6 Mitigation of the Impacts of Mining Operations
• Media Type: D
• Archive: Yes

RULE 2 - PERMITS
0
TABLE 2.05.6 2 -T1
SIMPLIFIED WATER BALANCE FOR PSCM
PRODUCTION LEVEL (MMTONS CLEAN)
2.0
WATER BALANCE CATEGORY
, mlacreft/ r
- Mine Inflows
52/83.9
Subtotal System Inputs (acre -ft/ r)
83.9
System 00t Puts "
- Surface Moisture Coal Shi ments 2
27.4/44.2
- Depletion of overlying alluvium due to Mine
inflows
0.18/0.3
- Surface Dust Control
6.9/11.1
- Evaporative Losses All Active Ponds 4
*/32.9
Subtotal System Outputs
88.5 (acre - ft/yr)
Chan' e m Stara e „ ", :
6 (acre- fklyr)
Notes:
General - Inputs to Sage Creek Coal Company's (SCCC) water system are primarily ground
water inflows to the active mine workings. With the exception of the system outputs identified, all
water is recycled and reused within the mine water system. Asterisk denotes value not available.
' - Mine inflows are based on the maximum amount of water predicted at 26 months during
the permit term.
2 - Surface moisture loss calculation based on maximum estimate of surface moisture of 3.0
percent for 2 million tons per year of coal production.
3 - Based on calculation of potential alluvial groundwater flow along Grassy and Little Grassy
Creeks to mine workings at 26 months during the permit term.
4 - Based on maximum (total) pond surface area of approximately 14.9 acres and annual lake
evaporation rate for Hayden, Colorado based on data from U.S. Department of Commerce and
U.S. Bureau of Reclamation procedures in Seneca Coal Company's Water Rights Augmentation
Plan for the Yoast Mine.
5 - Given that all system inputs are recycled, with the exception of the identified system
outputs (losses or depletions), the difference between inputs and outputs represents a net change
in system storage.
PSCM Permit App. 2.05 -67.2 Revision 03/05/10