REP48441

• Permit No: C1981041
• IBM Index Class Name: Report
• Doc Date: 5/7/1992
• Doc Name: 1991 Annual Hydrologic Report
• Annual Report Year: 1991
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

Water Year CRDA-O1 CRDA-02 CRDA-03
. 1988 4863.9 4854.7 4862.5
1989 4863.3 4852.5 4860.2
1990 4862.6 <4851.9 4855.8
1991 4862.7 <4851.9 4855.3
The water levels in the Cameo Refuse Disposal Area No. 1, CRDA
No. 1, showed little change over the previous year. CRDA-02
remained below the bottom of the piezometer all year and CRDA-03
reached the bottom of the piezometer. CRDA-01 showed a slight
seasonal variation, but remained close to the 1990 average water
level. Another piezometer was added to CRDA No. 1 in October
1991, to monitor water levels south of CRDA-O1. The piezometer
CRDA-OlA was installed to a depth of 50' and showed no water upon
initial installation. This piezometer was installed to verify
our suspicions that the high water level in CRDA-O1 is a small
isolated occurrence rather than indicating the water level in the
entire pile. Subsequent monitoring has shown some water in
CRDA-OlA but no where near the levels shown in CRDA-O1.
Piezometers CRDA-04, O5 and 06 were installed in October 1991, on
CRDA No. 2 pile. Further evaluation of these new piezometers
will be in the 1992 annual hydrologic report.
MINE WATER
• Mine inflows studies were done in both mines near the first of
October 1991. The results of these studies is shown on table
M91-1 and M91-2. The location of the sampling points are shown
on the 1991 Mine Inflows Map.
The mine inflows from the Roadside Mine were split between
discharge to the surface, discharge to abandoned portions of the
mine and consumptive use. Discharge to the surface from CDPS
outfall 001 is excess water not used in the plant. Mine water
from mine locations 3 and 5 can be pumped to the surface as
needed or allowed to flood abandoned portions of the mine. Due
to a broken discharge line no discharge was made from 001 for 8
months of the year. No discharge was made from CDPS point 002
during the year. The discharge to abandoned areas of the mine
are not measured, but the water level in the mine is shown on the
Mine Inflows map. Readings during the year indicate a 3.2'
rise/month. At that rate, it is estimated that water will
discharge from the old NW Intake portal in late 1992 or early
1993. Consumptive water use is discussed in the next section of
this report.
The Roadside Mine showed a large increase in inflows during the
year. The majority of the increase showed up at the new location
20. This increase is a result of mining additional virgin coal
to the south. Mining in this direction generally results in
higher flow as adjacent coal is dewatered and a subsequent lower
flow after that. Water from location 5 is routed into a 4" pipe
just below the sampling point. With the increased flows not all