GENERAL49777

• Permit No: C1981023
• IBM Index Class Name: General Documents
• Doc Date: 3/31/1993
• Doc Name: PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN2
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

Water Level Magnesium Cation
pH Amonia (unionized) Anion
Conductivity Potassium SAR
Temperature Sodium 8erilium
TDS Sulfate Lithium
Bicarbonate Iron (total and dissolved) Vanadium
Calcium Manganese (total and dissolved) Cobalt
Submit this technical revision to the Division by June 1, 1993.
Three ground water aquifer systems exist in the permit and
adjacent areas:
(1) The regional rock aquifer associated with the Pictured
Cliffs Sandstone located stratigraphically below the lowest
coal seam to be mined;
(2) The limited aquifer associated with the coals and
overburden sandstones of the Lower Fruitland Formation; and
(3) The alluvial aquifer associated with Stollsteimer Creek.
The Pictured Cliffs Sandstone is the major regional aquifer in
the area. The lowest coal seam to be mined is the C seam,
which lies stratigraphically some 40 to 50 feet above the
Pictured Cliffs Sandstone. The Pictured Cliffs Sandstone is
composed of a 200- to 250-foot massive sandstone. The strata
between the C coal seam and the Pictured Cliffs Sandstone is
impermeable. Impacts of the mining operation on this aquifer
will be minimal, given the thickness of the separating strata,
the dip of the strata, and the present mine plan.
Aquifer tests were performed on the Lower Fruitland Formation
in the Barren Ridge Area. These strata have a transmissivity
of 210 gallons per day per foot (gpd/f t) and a storativity of
1.3 x 10-4. These aquifer values indicate that the Lower
Fruitland Formation will support only limited ground water use
and ground water movement.
Quality of ground water found in the Lower Fruitland Formation
aquifer is marginal for use as a domestic water supply.
Sampling of these aquifers revealed elevated levels of sodium,
calcium, and sulfate. Overburden and coal analyses indicate
the elevated levels of these parameters should be expected in
any ground water encountered in this zone.
The alluvium associated with Stollsteimer Creek contains a
water table aquifer which is recharged by the creek and by
flood irrigation practices. Aquifer tests conducted for
Chimney Rock Coal Company by Piteau and Associates estimate a
high transmissivity of the alluvium, approximately
100,000 gpd/f t. The alluvium ranges from one Foot to just over
40 feet in thickness. This aquifer is confined by the steep
rock slopes of the Stollsteimer Stream Valley. This stream
valley has been determined to be an alluvial valley floor by
the Division. The alluvial valley floor is both flood and
subirrigated and used as irrigated pastureland by the landowner