REP04258

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: 1993 AHR text & streamflow
• Annual Report Year: 1993
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

•
•
•
Hrdro(ogic Mortuoring Arnriars
summarizes these resources. Some of the
USFS water resources are springs. No
changes in the USFS Water Resources Map
aze necessary for WY 1993 because no new
rights were filed for or new uses made in
WY 1993 in the lease azea. Two USFS
water resources (131 and 139) overlie the
Curren[ permit azea. The overburden is in
excess of 350 feet under these resources and
no mining related impacts (i.e., no loss of
flow) are anticipated. This "zone of effect"
is based on a 30-50 times height factor
mining from a heuristic rule general in the
international coal community (Dr. Hawed
Maleki, USBM, Personal Communication,
1994).
Groundwater Monitoring
There were 25 wells in the FY 1993 WY
monitoring program. Their locations aze
shown on Exhibit 1. Well completion data
is found on Table 4A. Sampling frequency
for water levels and water quality was a
minimum (scheduled) of 3 times per year.
Two of the wells, SOM-38-H-2 and SOM-
38-H-3, were lost to subsidence prior to the
1992 WY and were not visited. Well SOM-
38-H-1 was lost due to subsidence, and
monitoring of well JMB-12 was initiated,
during the year. The monitoring of SOM-
127-H was discontinued due to conflicts
with MSHA and replaced by SOM-129-H.
A technical revision documenting these
changes will be submitted within the next
month. A summary of the groundwater
monitoring program is presented in Table 4.
Monitored field parameters included water
level, pH, conductivity, temperature, dis-
solved oxygen, and turbidity. Samples were
analyzed in the laboratory for pH, conduc-
tivity, total dissolved solids, total suspended
solids, total iron, and total manganese.
Results of the sampling efforts are summa-
rized in Appendix H. Hydrographs depict-
ing water levels from 1978 to the present
have been included as Appendix I. Mini-
mum and maximum values for the baseline
monitoring period are compared with WY
1993 data in Appendix E.
The lower refuse pile was permitted in May
1986 for permanent disposal of some 1.7
million cubic yards of mine development
waste, coal processing waste, and sediment
pond cleanout material. During WY 1993,
approximately 10,516 tons (11,742 cu. yd.)
of mine development waste from the under-
ground mining operations were placed in the
lower refuse pile in the phase IV azea.
Facility area wells and alluvial wells (SG-1
and GP-1, 3, 4, and 5) were established to
monitor the impact on alluvial groundwater.
Baseline information for SG-1 and GP-1, is
compared to WY 1993 data in Appendix E.
Mine Water Monitoring
North fork Water
During WY 1982, the conditional right to
withdraw water from the North Fork was
deemed absolute. When this water right is
in priority-river flows greater than 300 cubic
feet per second (cfs), water can be pumped
from the intake point ro the freshwater
storage pond(s) within the surface facilities
area. In average years, this water right is
expected to be out of priority from July to
September. In WY 1986 and 1993, MCC's
Mt. Gunnison Pipeline water right met
quadrennial diligence for a conditional
portion. Accordingly, an additional portion
was deemed absolute by the Division 4
Water Court. That decision brought the
absolute portion to 1.0 cfs. MCC has a
conditioned right to 14.0 cfs.
6