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INSPEC44091
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INSPEC44091
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Entry Properties
Last modified
8/24/2016 9:47:20 PM
Creation date
11/18/2007 11:35:03 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981025
IBM Index Class Name
Inspection
Doc Name
Inspection Report
From
OSM
To
DRMs
Inspection Date
4/17/2007
Media Type
D
Archive
No
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North Thomson Creek Mine Phase III Bond Release, pg.2 <br />The Middle Thompson Creel flumes were not inspected due to poor road conditions. I <br />have evaluated these reclaimed flumes on previous inspections with no problems noted. <br />Ground conditions were moist throughout the mine, but no surface runoff noted. North <br />Thompson Creek had high spring flows. <br />Mr. Kaldenbach began the field inspection at the developed water resource area where we <br />all met and had our orientation. The access road and former haulroad segment in this area <br />have been approved for permanent retention. Sediment pond 9 held water but was well <br />below dischazge elevation. The pond appears stable. We walked to the reclaimed refuse <br />pile and inspection participants observed three sinkholes on the upper end on the <br />reclaimed pile. These sinkholes will need to be backfilled and reseeded. All other areas of <br />the pile, and the reclaimed roadway and mine facilities inspected enroute to the pile were <br />stable. <br />Water was discharging from Mine No. 1 into the Long Pond (passive water treatment <br />pond). Field parameters measured on site at the Mine No. 1 discharge indicated <br />compliance with water quality standards. The long pond passively discharges into another <br />treatment cell (Tl), and Tl passively discharges in a third treatment cell, T2. The <br />dischazge from T2 flows downslope into N. Thompson Creek, and this discharge <br />constituted the former outfall 001 for the NPDES discharge permit. The treatment ponds <br />were full during the inspection. The Colorado Department of Health terminated the <br />NPDES permit at the permittee's request on 04/20/2006, with an effective termination <br />date of Mazch 2005. This discharge from T2 appeared to meet livestock watering <br />standards based on Mr. Kaldenbach's field sampling, and there were no problems noted <br />around the discharge location. <br />The reclaimed Mine No. 1 portal backfill on the south side of N. Thompson Creek was <br />inspected next and the water discharged from Mine No. 1 is included in the 4.3 acre <br />developed water resource area. The backfill appears stable and the culvert access to the <br />mine portal seals is secure and locked. We inspected the dischazge pipe from Mine No. 1 <br />into the long pond; and noted that the adjacent Mine No. 3 discharge pipe was not <br />flowing. Mr. Kaldenbach measured field parameters of the Mine No. 1 discharge and pH <br />was 7.4. Mr. Kaldenbach reports other field pazameters in his inspection report. The Long <br />Pond appeared stable and functioning as designed. I discussed the DRMS Abandoned <br />Mined Land (AML) Program's peat-bog passive water treatment system just above this <br />location with some of the inspection participants. Discharge from this passive treatment <br />system enters N. Thompson Creek above the Long Pond. This system treats mine water <br />discharge from the former (pre-SMCRA) Mine No. 2 that was reclaimed by the DRMS- <br />AMLprogram. <br />We next inspected the Mine No. 3 area. The water discharge system from Mine No. 3 to <br />the Long Pond is included in the developed water resource post mining land use. There <br />are two discharge pipes from the Mine No. 3 reclaimed portal that converge into a <br />concrete manhole north and adjacent to the roadway. <br />
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