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GENERAL47069
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Last modified
8/24/2016 8:21:46 PM
Creation date
11/23/2007 3:07:08 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
General Documents
Doc Date
12/31/1986
Doc Name
PROPOSED DECISION AND FINDINGS OF COMPLIANCE FOR RN1
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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Potential acid-forming material has been identified in the Wolf Creek area. <br />To date, this material has been mixed with other spoil material during the <br />normal course of mining. If analyzed spoil material had a pH value of less <br />than 5, lime is added to neutralize the spoil. Since the lowest pH measured <br />to date has been 5, no lime has been added to spoil material at Seneca II <br />Mine. Upon additional investigation, it was determined that acid base <br />potential (ABP) analysis should be utilized to evaluate spoil acidity, since <br />this analysis indicates the ultimate reserve acidity levels of overburden. <br />Based on a review of current literature, Peabody Coal Company proposes to take <br />corrective actions when an ABP value of -5 or less is measured. <br />Acid-forming material is usually encountered in shallow overburden areas in <br />the Wolf Creek area. If mixing of the overburden material does not alleviate <br />the acid problem, mitigation will be accomplished in one of two ways: <br />1. Suitable (ie.: non-acid) spoil material will be transported to the <br />problem area and distributed to a thickness of 2-3 feet; or, <br />2. Sufficient quantities of agricultural grade limestone will be <br />incorporated into the upper 12-24 inches of the spoil material to <br />neutralize the excess active and reserve acidity. <br />The operation is in compliance with the requirements of this section. <br />XVI. Explosives - Rules 2.05.3(6) and 4.08. <br />Information regarding the use of explosives at the Seneca II Mine is presented <br />in Volume II, Tab 12, pages 12-31 to 12-43 of the revised permit renewal <br />application. The notification, pre-blasting survey, recording, and signs <br />aspects of the proposed blasting plan are in conformance with regulatory <br />requirements. <br />The operation is in compliance with the requirements of this section. <br />XVII. Backfillinq~an~Grading - Rules 2.05.3(3), 2.05.3(4), 2.05.4(2)(a) <br />-a--rsrarv-n ,, ns--err . _a <br />Information pertaining to backfilling and grading is presented in Volume II, <br />Tab 12 of the permit renewal application. Exhibits 12-1 and 13-2 show the <br />current and proposed post-mine configuration of the pit areas. Exhibit 12-9 <br />of the original application also depicts proposed post-mining contours. <br />Surface coal mining operations at the Seneca II Mine are conducted in two <br />areas, depending on the particular coal seam(s) being mined. Mining <br />operations at the Wolf Creek pit area will be conducted in portions of the <br />S1/2, S1/2 Section 36, T6N, R87W, N1/2 and SW1/4 Section 1 and the SE1/4 NW1/4 <br />and E1/2 W1/2 Section 2, both in T5N, R87W. The Wadge pit areas, divided into <br />the 4ladge East and Wadge West pits, are generally located in the SE1/4 Section <br />11 and the N1/2 Section 12, T5N, R87W, respectively. <br />-37- <br />
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