2020-10-22_PERMIT FILE - C1981012A ‎(4)‎

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 10/22/2020
• Section_Exhibit Name: Section 2.05 Operation and Reclamation Plan
• Media Type: D
• Archive: Yes

in the flooded workings. The Probable Hydrologic consequences of each
coal waste disposal operation will be discussed below.
Backfilling of the Purgatoire Channel
Column leach tests were performed as an aid to the prediction of
water quality effects resulting from backfilling the existing channel
with coal refuse. Samples of the refuse that would be used for
backfilling were collected from four locations on January 12 and 13,
1984. Each sample is comprised of material composited over a depth
interval of 2 to 10 feet taken from the walls of backhoe pits as listed
below.
Sample No.
Description
#8
Backhoe pit adjacent
to test hole
#8,
sampled
from 2 to
10 feet, January 12,
1984.
#9
Backhoe pit adjacent
to test hole
#9,
sampled
from 2 to
10 feet, January 13,
1984.
#10
Backhoe pit adjacent
to test hole
#10
sampled
from 2 to
10 feet, January 13,
1984.
#11
Backhoe pit adjacent
to test hole
#11,
sampled
from 2 to
10 feet, January 13,
1984.
An ESM column leach test was conducted on each of two splits of
the coal refuse. The ESM test consists of displacing an antecedent pore
solution that is in chemical equilibrium with the solid phase. The
samples as received in the laboratory were contained in plastic bags and
were at the naturally occurring field moisture content. No additional
was added. Therefore, the antecedent moisture referred to in subsequent
discussion is the natural field moisture at the conditions of chemical
equilibrium dictated by the field environment.
The four samples were spread on a plastic sheet and thoroughly
mixed. The resulting composite was passed through a 0.371 in sieve to
remove the large particles that could not be accommodated in the leach
columns. The large particles have a very small specific surface and are
RN -6
2.05-77 (Repaginated 10/21/16)