GENERAL38867

• Permit No: C1981019
• IBM Index Class Name: General Documents
• Doc Date: 11/20/2000
• Doc Name: Midterm Review Findings Document
• Permit Index Doc Type: Findings
• Media Type: D
• Archive: No

C-81-019 2000 Midterm Review
November 20, 2000
Please add the surface water user information within the Permit Boundary and within a
one mile radius from the boundary in Feeding or receiving watersheds of the affected area.
Please add a title for the Wilson Reservoir and the Wilson Reservoir water intake to NIap
10.
Item 18. Rule 2.04.7(4)(b). Elevations and locations of monitoring stations used to gather data
for water quality and quantity are shown on Maps 10, 32 and 37. Information relative to the
current monitoring program is on pages 4.05-10 through 4.05-15 of the PAP. Elevations and
locations of wells (alluvial) and surface water stations (including NPDES discharge points) used
to gather data for water quality and quantity information as required by the monitoring plan are
shown on Map 37. blap 37 was last revised December 1992. This map is outdated in that
discharge points (CPDES) 8, 9 and 10 are not shown. Exhibit 18 is referenced as a source of
information on revised monitoring programs. Therein, a minor revision of August 14, 1989 is
referenced as changing the groundwater monitoring program. A minor revision of March 24,
1992 is referenced as changing the NPDES permit. Map No. 32 is annotated as 1975 - 1981
information, and Map 10 was last revised on October 1990.
Please revise NIap 37 to add the missing elevations and locations of monitoring stations
used to gather data for water quality and quantity associated with the currently approved
water monitoring program.
Item 19. Rule 2.04.7(4)(c). The PAP is in compliance with this rule. Groundwater information is
provided in the PAP beginning on page 2.04.7-3 and ending on page 2.04.7-27. The PAP
indicates, in summary, that subsurface water (other than perched water tables) is not encountered
in the zone of materials to be excavated. The PAP indicates that the only potential aquifers are at
depths in the range of 800 feet below the lowest coal seam to be mined, and are separated from
the coal seam by the Mancos shale, a relatively impermeable formation. In addition, the PAP
indicates that the potential aquifers form a closed basin, with no current significant use (Colowyo
has two wells for potable water). The PAP indicates that water above the coal seam is limited to
perched water, the portions of ground mined or to be mined being bound and drained by incised
streams and drainages on the south, east and west, and topographic relief (on the north).
Item 20. Rule 2.04.7(4)(d). The PAP is in compliance wi[h this rule. Information on surface
water is provided on pages 2.04.7-29 through 2.04.7-101. The location of streams, lakes
(reservoir), springs, and natural drains are shown on Map 10. The locations of sedimentation
ponds, holding ponds, stock ponds (temporary small depressions) and ditches are shown on a
combination of Maps 11, l2, and 12A.
Item 21. Rule 2.04.7(4)(f). The PAP is in compliance with this rule. There are no oil and gas
wells listed in the PAP. A check (]0 April 2000) of the lis[ of oil and gas well permits of the
Colorado Oil and Gas Conservation Commission, Colorado Department of Natural Resources,
found no well permits in the vicinity of the mine permit.
Item 22. Rule 2.05.3(2)(a). The PAP is in compliance with [his rule. A description of surface
mining operations begins on page 2.05-1 of the PAP. The deep-pit, multiple seam operations at
10