GENERAL55958

• Permit No: C1981014
• IBM Index Class Name: General Documents
• Doc Date: 2/8/1993
• Doc Name: Midterm Review Findings Document
• Permit Index Doc Type: Findings
• Media Type: D
• Archive: No

b) If appropriate, prepare maps of the disturbed areas distinguishing
between mining which occurred prior to Auquat 3, 1977, between August
3, 1977 and May 3, 1978, after May 3, 1978 or after January 1, 1979
if Dorchester had a small operatora• exemption under the interim
. Federal Regulatory program per Rule 2.10.2.
Backfilling and Grading - Rules 2.05.3(61(b1, 2.05.3!9), 2.05.4(21la1.
2.05.4(2)(cl. 4.09, 4.13, and 4.14
29. Provide a rill and gully mitigation plan for reclaimed elopes compatible
with Aules 2.05.4(2)(c), 4.14.1(2)(b) and 4.14.6. Describe generic repair
methodologies ae well ae the dimensions of specific erosional features
which would initiate repair. Commit to the annual mapping and description
of rills and gullies, a method for assessing the degree of erosion, and
time frames for gully repair.
Coal Processing Waste and Underground Development Waste - Rules 2.05.2.
2.05.3(11, 2.05.3(21. 2.05.3(31, 2.05.3(81, 4.01, 4.10 and 4.11
30. Provide an analytical demonstration that the underdrains for the refuse
pile can handle any anticipated flow through the drains per Rules
4.10.3(5) and 4.09.1(3). When providing the demonstrations, anticipate
some clogging of the drain, given the current filter blanket. Also,
consider projected impacts from subsidence on the functioning of the
drain.
31. The original permit application had information on the roof and floor from
five holes, per Rule 2.04.6(3)(a)(iv)(D). Subsequent permitting resulted
in two additional samples of the refuse. These samples showed significant
differences from the roof and floor samples. Commit to a verification
geochemical sampling program of the active refuse pile on an annual basis
to provide information to assess the potential for reclamation success on
the refuse pile, as well as long-term impacts to the ground water.
Specify the sampling methodology, the parameters which will be monitored,
the laboratory pre-treatment of the sample and the date for submittal of
the information. The Division would consider a shortened parameter list
restricted to pH, electrical conductivity, SAR, pyritic sulfur, organic
sulfur, sulfate sulfur, total sulfur, percent combustible solids,
neutralization potential, iron, and manganese.
32. Please propose a program to verify that compaction of the refuse pile is
meeting specifications per Rules 4.10.4(3)(b) and 4.10.2(2)(b).
33. The 1992 evaluation of the stability of the refuse pile resulted in
modifications to the general morphology of the pile. Please make aura
that all references to the refuse pile are consistent, throughout the
permit application; i.e. total height of 80', 3:1 side slopes, etc.
Subsidence - Rules 2.05.6(6) and 4.20
34. Please use the 29° angle-of-draw and delineate its surface expression on
the Mine Plan (Map 17) per staff evaluation of the semi-annual subsidence
reports (Rules 1.04(7), 1.04(89), and 2.10.3(c)). The current
representation of the angle of draw appears to have more to do with the
location of the permit boundary than the actual surface projection of the
angle of draw.
35. Please prepare an overburden isopach map at a scale of 1"=200' to aid in
the evaluation and control of subsidence per Rules 2.04.fi(1)(e) and
2.04.6(3)(a)(i).
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