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

the mine inflow study, eo that areas of development mining are
distinguished from areas where various types of retreat mining have taken
place. In addition, it would be helpful if there was some distinction
between Red Arrow and Jack O'Lantern coal. The latter might be clarified
through a note on the legend.
21. Please update Table 1, page 6, to reflect coal production history between
1990 and 1992 (Rule 2.05.2(1)).
22. Please modify the affected area projection in Table 2, page 2.03.40 A to
reflect the current affected area, ae well ae the affected area through
1994 using the current angle-of-draw of 29°.
Ponds, Imooundmente. Diversions - Rules 2.05.3 and 4.05
23. The black water pond used for recycling processing plant water, adjacent
to Pond 1, appears to fall into the classification of a temporary
impoundment per Rule 4.05.9(2). Thus, a number of demonstrations need to
be made. The pond needs to be adequately sized to contain the standard
volume of water from the processing plant and one-to-three years of
sediment from the plant. The pond must either contain the 25- year 24-hour
event, like Ponds 2 and 3, or provide a mechanism for discharge (Rules
4.05.6(3)(d), (e) and 4.05.6(5)). Show through an ae-built that the aide
elopes are no steeper than 0.5(h):1(v) (Rule 4.05.9(6)). If appropriate,
prepare a design to get the pond up to specifications, and include a
commitment for implementation of that design within a fixed period of time
following approval of the Mid-Term technical revision.
24. Storms during the summer of 1992 resulted in damage to many armored
channels, including the inlets to Pond 4, the inlet to the eastern loadout
pond and the Magpie Creek diversion. Evaluate the installations and
modify the design as necessary. At a minimum, provide a generic rip-rap
installation appendix which provides specifications on rock angularity,
composition, size gradation, and on filter blanket specifications per
Rules 4.05.3(4) and 4.05.3(7)(a).
25. Division files documenting certifications on the construction of ponds is
incomplete. Please provide the most recent certifications on all ponds
per Rules 4.05.6(10) and 4.05.9(10). The Division has copies of the
outlet works certifications from Ponds L1, L2, 4, and 5. If the as-built
on the structure results in a change to the hydraulic functioning of the
structure, be sure to include a discussion and appropriate documentation
that the structure still meets the design criteria found in the
regulations. A copy of the Division's guidelines on certifications ie
enclosed for your perusal.
26. Please include demonstrations for small area exemptions for the twc
substations (NO. 1 and No. 2), and the explosives bunker area (Rule
4.05.2(3)).
27. It appears that Pond 3 impounds water from the Corley Mine well and the
discharge of mine inflow water from the 1-North sump. This water is used
in the processing plant or is discharged through discharge point 003 ( p.
2.05.3-44). Page 2.05.3-45 indicates that Pond No. 3 is a non-discharging
pond. Please clarify.
Reclamation - Rule 2.05.4, 3.01 and 3.02
28. Statements on pages 2.05.3-17 and 2.05.4-11R leave the impression that the
disturbance at the loadout preceded mining, while 2.05.3-57 indicates that
Dorchester developed the loadout.
a) Please be more explicit about the type and extent of disturbance
as well ae the date in which the area(s) were developed for use in
coal mining.