PERMFILE134633

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 2.04 Information on Environmental Resources
• Media Type: D
• Archive: Yes

Colorado Yampa Coal Company and submitted to the DMG (formerly the CMLRD) in January, 1986. A copy of the
• report is included as Exhibit 35, Bac~ll Hydrologic Evaluation.
The water quality characteristics of the backfilled areas of the adjacent sulfate mines aze represented by analyses of
discharge from these materials near Sediment Pond F of CYCC's Eckman Pazk operation. This data shows a fairly
consistent water quality characterized by TDS concentrations of about 4000 mg/I and a strong calcium-magnesium-
sulfate dominance (Figure 4-g, Ground Water Quality Data).
Known Uses of Ground Water
Per the 1983 application, ground water in the Twentymile Park Basin is not suitable for most domestic uses. All
existing registered wells in the permit and adjacent areas are owned by Cyprus Western Coal Company and utilized
for washdown, dust control and other mine related purposes. Based upon accepted water quality standards, use of
ground water in the general azea is restricted to livestock watering, irrigation, and limited domestic use.
A review of Colorado State Engineers records indicates the existence of several adjudicated wells within the
general vicinity of the permit area. The wells falling inside the affected area have been included on revised Table
9, Summary of Ground Water Rights and located on revised Map 15, Alluvial Valley Floors and Water Rights. The
location and completion information for these wells was examined to ascertain whether there is any potential for
adverse impacts as a result of the Foidel Creek mining operation. TCC conducted an inventory of Trout Creek
sandstone wells and they were located in the field and baseline water levels were recorded.
Several wells within the vicinity of the permit area are completed within the alluvial deposits of Trout Creek and
Middle Creek upstream from any mine discharge or affected bedrock discharge effects. Two wells located in the
Foidel Creek drainage in sections 22 and 27, Township 5 North, Range 86 West are completed in the Upper
• Williams Fork Formation, probably in the Holdemess member above the Twentymile Sandstone. Four wells,
which appeaz to be completed in the Trout Creek sandstone, are indicated in the State Engineers records. The Trout
Creek sandstone potentiometric levels may be lowered if significant mine inflows from this unit are realized as
described in the Probable Hydrologic Consequences section of the permit application. Two of these wells Trout
Creek sandstone wells, both recorded as being located in section 13 of Township 5 North, Range 86 West could not
be located in the field by TCC and aze assumed abandoned, not in use or the locations recorded in the State's files.
The other tow wells, one of which is owned by Cyprus Westem Coal Company, have been located and baseline
water levels recorded on June 25, 1986 as follows:
WELL LOCATION WATER LEVEL (FT.
QTR QTR SEC TWN
ENERGY NE SE 02 5 NORTH
FUELS
WELL
TERRY SE NW 36 5 NORTH
GREEN
WELL
RANGE BELOW TOP OF
86 WEST 33
86 WEST 65 (PUMPING LEVEL)
TCC extended its mine by developing the 9 and 10 Gateroad extension and the wells which are located within or
adjacent to the area overlying the this area aze presented in Exhibit 6B, Summary of Ground Water Rights. The
wells are shown on Map 1 lA, Well Locations for Eastern Mine District. A review of the wells listed in the exhibit

ppPROVED APR 2 4 2000
Permit Renewal No. 3 2.04-24 11/1/99