PERMFILE60239

• Permit No: C1981041A
• IBM Index Class Name: Permit File
• Doc Date: 10/3/2005
• Section_Exhibit Name: Tab 14 Reclamation Plan
• Media Type: D
• Archive: Yes

• High sodium adsorption ratios SAR, and electrical conductivity, EC, values are
typical of the area and as a result, more tolerant species are included in the final
seed mixes. For reclamation purposes, a topsoil or suitable plant growth medium
that will be used on the top 6" of cover will be limited to a maximum SAR value of
12 and EC value-of 8. For the lower 12 or 18" of cover material, depending upon
the location, the maximum limits for SAR and EC will be 25 and 15 respectively.
As regrading of an area proceeds, soils which are projected to be placed in the
top 18 or 24" of cover will be sampled for SAR and EC to determine the most
suitable topsoils and subsoils. Sampling will be done on a minimum frequency of
one per acre, approximately 200'centers, and 2' depth intervals. In cases where
spot SAR and EC levels are high, calculated blending ratios may be used to
maintain the values of the backfill material within the desired range.
•
I •
Roadside South Portal and Roadside Refuse Disposal Area, The final
reclamation contours for the Roadside South Portal area including the Roadside
Refuse Disposal Area (RSRDA) are shown of Exhibit 6C. Cross-sections
representing the existing and final grade are shown on Exhibit 26. Due to a long
history of mining on the site, original contours are not known. The final contours
for the areas other than the RSRDA were inferred from adjacent slopes and
material balances. The final contours for the RSRDA include 2-2.5h: 1 v slopes
between 10' - 15' wide benches on 30 - 40' elevation intervals, resulting in an over
all slope of less than 2.5h:1v. The benches will have a grade of approximately 5%
to the inside and approximately 2% north toward the drainage channel. During
2002, the existing cover was graded off of the slope and used as cover below the
first bench. Refuse material cut from the pile to establish the benches was
placed in an extension of the pile to the north. This material was spread and
compacted to 90% of its maximum dry density in horizontal lifts not exceeding 2'
in thickness. A permanent diversion was constructed on the east side above the
pile. This diversion ditch conveys run-off from above the pile to the south and
discharges into Sediment Pond 9. Design for the diversion is shown in Appendix
14-6. The 18" of non-toxic material required to cover the refuse pile was obtained
from the RSRDA borrow area located above and east of the pile shown on Exhibit
6C.
Approximately 21,000 cubic yards of suitable plant growth media, after topsoil
salvage, was obtained from the borrow area. Another 2,000 cubic yards of the
cover material was salvaged from the existing cover material and re-used for
cover. See Table 14-7 for borrow area quantity calculation. See Appendix 9-4 for
the analysis of soil samples 1 through 4 and 5 through 9. The location of the soil
samples is presented on Exhibit 6C, Volume 5, Tab Section 14. Care was taken
to salvage only the suitable plant growth media from the RSRDA borrow area.
Additional soil samples 5 through 9 were obtained and analyzed prior to borrow
area use to better define the salvage limits. Soils were analyzed for pH, salinity,
texture and sodium adsorption ratio (SAR). Only sample 8 showed high salinity.
The technique used to excavate and place the cover material from the RBA to the
RSRDA caused significant mixing of the soils. This is demonstrated by the soil
sampling performed on the RSRDA. The maximum EC and SAR values at
RSRDA are S.0 and 9.63 respectively. See Appendix 9-7 for the results of soil
analyses.
14-6 (Rev. 4(03)