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GENERAL40417
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Last modified
8/24/2016 7:59:37 PM
Creation date
11/23/2007 10:39:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981025
IBM Index Class Name
General Documents
Doc Date
8/12/1993
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN2
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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J L <br />Reclamation of the mine and loadout facilities has involved two phases: an <br />interim and a final phase. The interim reclamation phase was ongoing and was <br />designed to add to stability and aesthetics during mining and to provide an <br />opportunity for testing and improving revegetation techniques. <br />The specified goals of interim reclamation at the mine site were to stabilize <br />slopes and prevent erosion, improve wildlife habitat, and beautify the area. <br />The interim plan at the mine site included incremental seeding of the refuse <br />area as the pile was constructed. The first increment was seeded in 1979. <br />The goals of the interim reclamation plan for the loadout were to minimize <br />visual impact and to prevent the topsoil pile from becoming contaminated. <br />Visual impact was minimized through revegetation which involved the planting <br />of native and exotic ornamental species. Revegetation commenced in 1980 and <br />was in a state of maintenance by 1982. Topsoil was protected from possible <br />sources of contamination by relocating the pile to a protected area. In 1981, <br />the topsoil stockpiles were reshaped, fertilized and planted to protect them <br />against erosion and contamination. Additional protective measures, including <br />drainage control and dust suppression, were used to protect stockpiles located <br />near coal loading structures. <br />Final reclamation of the refuse area was completed in 1986. The reclamation <br />included regrading the top bench and covering the refuse with one foot of <br />cover. Some of the soil used to cover the refuse pile was imported, because <br />topsoil was not saved during the early years of mine operation. <br />In 1987, the rest of the mine site was reclaimed. The surface facilities were <br />removed and the portals, shafts, exploration holes, and wells were sealed. On <br />April 28, 1988, a discharge of iron-laden water was discovered entering the <br />creek. The discharge was traced back to the No. 1 Mine portal seal and <br />adjacent airshaft, which were leaking as a result of increased hydrostatic <br />pressures as the ground water was allowed to return to its equilibrium level <br />following the cessation of pumping. <br />The backfill in front of the portal seal was excavated to expose the seal and <br />airshaft. Two valved pipes were installed in the portal seal to control the <br />seepage and route it to several treatment ponds via a French drain. The <br />seepage water entering the treatment ponds was treated with sodium hydroxide <br />in order to increase the pH and allow the iron to precipitate before the water <br />discharged to the creek. The treatment system was later modified to increase <br />the residence time of the seepage water in the treatment ponds. This was <br />accomplished by elongating the treatment ponds to increase their volume. The <br />longer residence time resulted in the iron precipitating out of the water, to <br />below the NPDES effluent limits; without the sodium hydroxide treatment. <br />To date, the portal remains open to the seal. The portal entrance is <br />temporarily blocked by a wooden door. In addition, an empty sodium hydroxide <br />tank is stored behind the portal door. <br />The final reclamation of the loadout area included grading and backfilling the <br />disturbed areas. Most of the area was returned to its approximate original <br />contours and restored to support agricultural production. The loadout area <br />reclamation was completed in 1987. <br />
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