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REV92245
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REV92245
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Entry Properties
Last modified
8/25/2016 3:13:42 AM
Creation date
11/21/2007 11:19:45 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Revision
Doc Date
4/10/1996
Doc Name
SENECA II MINE C-80-005 TR 30
From
DMG
To
DAN HERNANDEZ
Type & Sequence
TR30
Media Type
D
Archive
No
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<br />C~0-005: TR-30. D. Hcmandcz-memo <br />cannot see that this study supports Seneca Coal Company's claim that 6 inches of topsoil is <br />sufficient to achieve reclamation success. <br />I did get a hold of Barth and Martin. 1984. "Soil Depth Requirements for Revegetation of <br />Surface-Mined Areas in Wyoming, Montana, and North Dakota". This paper had been <br />published in the Journal of Environmental Quality, Vol. 13, No. 3, 1984. This is not the <br />same title that Seneca Coal Company referenced. This is the same study, however, <br />according to the author, Dr. Barth, whom I spoke with on the phone. The studies <br />referenced by Seneca Coal Company by this author were not published as a public <br />document. The 1981 and 1982 papers by Dr. Barth referenced by Seneca Coal Company <br />were progress reports of the same study as the 1984 final paper. This study refutes Seneca <br />Coal Company's claim that 6 inches of topsoil would be sufficient. This study found that <br />"soil depth required for maximum production was 50 cm (-12 inches) for generic spoil" <br />Generic spoil was defined as spoil not having toxic, sodic, or acidic characteristics. The <br />slope gradients on the research plots ranged from 1-3%. The seeding rate was <br />approximately 31 pls/ftz of a perennial grass mix. Research plots were also treated with jute <br />netting. Elevation, aspect, average annual precipitation, and growing season length were not <br />reported in the paper. Once again this research does not support Seneca's claim that they <br />will be able to achieve reclamation success on the Seneca II site with 6 inches of topsoil <br />application. <br />Another aspect to consider when trying to apply the results of this study to the Seneca II <br />situation. The reclamation goal at Seneca II is not focused on maximizing forage production <br />whereas the study was. Rather establishment of a diverse, effective and permanent <br />vegetation cover of the same seasonal variety native to the area that supports the approved <br />post-mining land use, and recovery of productivity levels compatible with the approved post- <br />mining land-use is the ultimate reclamation goal at the Seneca II mine. (Rules 4.15.1(1) and <br />(2)) <br />The Redente and Mclendon, 1991, study entitled 'The Influence of Topsoil Depth on Plant <br />Community Dynamics of a Seeded Site in Northwest Colorado" was provided by Trapper <br />Mining, Inc. Basically this study purports that shallower soils will support greater vegetative <br />diversity and higher woody plant density. Although inherent differences exist between the <br />Trapper and Seneca II sites, i.e. aspect, seedmix.... the elevation, temperature regime, and <br />moisture regime are easier to extrapolate to the Seneca II site. <br />Unfortunately the study done at the Trapper Mine resulted in sites dominated by Smooth <br />bromegrass and Cicer milkvetch, with Western, Intermediate, and Crested Wheatgrasses as <br />well as Basin wildrye and Kentucky bluegrass present in lesser proportion. Seneca II Mine <br />has reduced the percentage of these two aggressive species, Smooth Brome and Cicer <br />milkvetch in their seedmix to avoid excessive dominance by these introduced competitors. <br />The VTF met and discussed Seneca's topsoil reduction proposal. Some of the ideas <br />stemming from that meeting follow. Rule 4.15.6(3) provides for establishing Field Trials to <br />test the effectiveness of proposed or ongoing reclamation plans. Seneca Coal Company has <br />
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