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1998-03-15_REVISION - C1981008
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1998-03-15_REVISION - C1981008
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Last modified
3/6/2021 10:28:18 AM
Creation date
6/11/2010 2:14:45 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
Revision
Doc Date
3/15/1998
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Type & Sequence
RN3
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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b. The current monitoring program will consist of: <br /> (1) Mine 1: Monthly field parameters and annual full suite water quality <br /> samples. <br /> (2). Mine 2: Monthly field parameters and semi-annual full suite water <br /> quality samples. <br /> c. NPDES sites at Mines I & 2 (sediment pond outlets) will have monthly <br /> maintenance, service, flow measurements, field parameters and quarterly full <br /> suite water quality samples. <br /> D. Stream Buffer Zones <br /> 1. The Division proposes to approve surface mining activities within 100 feet of a <br /> perennial stream. This decision is based on a finding that the original stream <br /> channel will not be disturbed, water quality and quantity shall not be adversely <br /> affected, and appropriate riparian vegetation will be reestablished. The buffer <br /> zone variance is granted for the area located along the southern disturbed area <br /> collection ditch to Pond 007 (4.05.18(I)). The area will be no larger than .4 acre <br /> at any time during mining and reclamation activities. <br /> E. Water Rights <br /> 1. The water augmentation plan is found in Section 2.05.6(3) of the permit <br /> document. Western Fuels-Colorado has acquired approval from the Colorado <br /> Water Court for this augmentation plan and has a completed well permit for use <br /> of water from Pond 007. <br /> F. Probable Hydrologic Consequences <br /> 1. Impact of spoil water quality on the ground and surface water quality: The <br /> available data indicate that a small proportion of the overburden may produce acid <br /> through the oxidation of pyrite. Based on laboratory tests on overburden cores, <br /> calcite is almost ubiquitous. Calcite serves two functions. First, it buffers the pH <br /> of the water, which tends to slow the oxidation of pyrite, reducing the production <br /> of acid. Second, it will neutralize the acid that is produced. The core samples <br /> that exhibited low paste pH's are surrounded by non-acid producing, calcite- <br /> bearing rocks. The water that contacts the low-paste pH materials will have first <br /> reacted with calcite, and therefore developed a pH-buffer capacity of its own. <br /> The groundwater monitoring data indicate that mixed overburden and interburden <br /> waters have near neutral pH's. Sample pH's less than 6 are associated only with <br /> the lower Dakota coal. Where the coal's permeability is high enough to produce <br /> about 5gpm during sampling, the acid-producing reactions do not appear to be <br /> fast enough to maintain the pH of the water less than 5. Oxidation rates may <br /> increase due to the mining process, however, other conditions which inhibit acid <br /> 17 <br />
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