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GENERAL44976
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Last modified
8/24/2016 8:13:41 PM
Creation date
11/23/2007 1:28:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1989074
IBM Index Class Name
General Documents
Doc Date
7/26/2005
Doc Name
Proposed Decision & Findings of Compliance for SL2
From
Full Phase II/III
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Phase I findings <br />Field inspection dunng the bond release inspection documented that the two small areas <br />excluded from the previous Phase I release request (SL-Ot ), the oil containment area and <br />the subsidence feature, have been returned to approximate original contour (AOC) and that <br />backfilfing, grading, and drainage control has been completed m accordance with the <br />approved plan for these hvo small areas The sediment containment ditch was also <br />specifically mentioned For reclamation in the Phase I findings (SL-01). However, the Phase I <br />findings also indicate all areas except the two mentioned above had been returned to AOC. <br />The ditch is well vegetated and directs runoff to the permanent pond for utilization by cattle <br />and wildlife. The pond has been previously approved to remain as a permanent <br />impoundment and the applicant has received approval of the required performance <br />standards of Rule 4 05.9 for permanent impoundments The ditch is part of the design for <br />this system and directs the flow to the permanent pond for utilization The applicant has met <br />the regwrements of the Rules and the approved permit for a Phase I bond release for the 1.4 <br />acres that constitute these areas. <br />Phase II Findin s <br />This request is also a Phase II bond release for all 12.62 acres. The applicant included a <br />sediment loss comparison using the Revised Universal Soil Loss Equation tRUSLE) In <br />summary. the fact that the vegetative cover on the reclaimed area is greater than the pre- <br />mine vegetation community results in a predicted soil loss from the reclaimed area that is <br />considerably less than the pre-mine soil loss. Therefore. more than 60% of the bond can be <br />released as allowed by Rule 3.03 1(3)(b) Also vegetation data collected in 2003 and 2004 <br />indicate the cover standard was achieved (Table B) and the vegetation community <br />established will support the post-mining land use (Rule 3.03 1(2)(b) <br />Phase III Findings <br />Surlace water impacts <br />Runoff due to rainfall and snowmelt comprise the surface water present on the reclaimed <br />and adjacent areas. Flow in Engleville Gulch was recorded and documented in surface <br />water monitoring efforts and through field inspection This flow was in response to snowmelt <br />andlor rainfall in the upper portions of the Engleville Gulch watershed on the north slopes of <br />Fischer s Peak. Discharge has not been recorded from the permanent sediment pond at the <br />site in more than ten years. Due to the significant storage capacity of the pond and the <br />limited watershed draining to the pond. d is unlikely that discharge from the pond would <br />occur except on an extremely limited basis. The likelihood for future surface water polluhon <br />is negligible. <br />Ground water impacts <br />Ground water was monitored during operations in a nearby USGS well, Montoya dug well, <br />well 29-4, and the Engleville mine discharge A revision to the perms approved discontinuing <br />this monitoring based on the data collected up to that time. Waler levels showed I~ttle <br />fluctuation and water quality samples indicated no significant changes in the ground water <br />quality due to mining at the Rimrock Mine, The mine had ceased operations at that time and <br />reclamation was complete through reseeding. Since the site was reclaimed. the only <br />
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