_PERMIT FILE - C1981008A ‎(19)‎

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Name: Engineers Report
• Section_Exhibit Name: Tab 16 Attachment 6-1
• Media Type: D
• Archive: Yes

will require mitigation because discharge for Pond 007 will
supplement the rights downstream from the pond. Hence, the
augmentation plan provides water primarily to the surface
rights on Calamity Draw upstream of Pond 007. Mitigation is
required only during the irrigation season, or about 7 months
out of 12 . Therefore, 7/12 of the pit inflow (43 .8) needs to
be replenished during the irrigation season. This amount is
25.8 acre-feet. The rights that may require augmentation
were determined from ground-water drawdown calculations
provided by GeoTrans, Inc.
In order to account for "losses" due to timing of flows
and diversions, and measurement error, an administrative loss
factor of 0.5 is used. Therefore, twice the augmentation
amount, or 51.2 acre-feet is used to prevent impact. This
excess water might be used to satisfy calls for water stored
out-of-priority in the ponds depending on the location of the
call and time of year.
The water consumptively used by the mine, and the water
for augmentation to prevent potential impact to rights caused
by pit inflow will be provided from the 27 shares of
Colorado Co-operative Company currently owned by Peabody.
However, this will entail obtaining permission to change the
use of the water to include industrial uses, and transferring
water from the Second Park area (Figure 2) to the NUCLA EAST
6
GEOTRANS, INC.