REP27634

• Permit No: C1983058
• IBM Index Class Name: Report
• Doc Name: TR 2 COAL PROCESSING WASTE AREA SECTION 2.06.10 OF THE APPLICATION
• Permit Index Doc Type: Waste Pile/Fill Report
• Media Type: D
• Archive: No

TWIN PINES
TECH. REV. 3
PAGE 2
Hydrologically the area lies near the ephemeral stream of South
Oak Creek which is discussed in detail in the permit application.
The site is generally protected from runoff above by a ditch and
berm above the highwall. Channel improvements included in
previous reclamation efforts should protect the site from
flooding during ma,ior.storm events. Ground water was not observed
in the test holes excavated on the site. ieveiw ofi the mine maps
rom Twin Pines Mine show that the coalJ5eafi'~t(i'p5' a ~4%" 34i" ~'
esber.Ly ~darection beward:the Chanpler Syncline,---(~-attache
~esfyctian_ of Twin Pines Mine Map 1. Essentially runoff from the
site will be limited to the immediate area of the pile. As the
pile increases in volume, percolation to lower stratas should be
very limited. Volume calculations for the waste pile are shown on
Figure 1.
DESCRIPTION OF MATERIALS TO HE WASTED IN THE SITE
As previously discussed, the coal processing waste material to be
disposed of in the site generally consists a white band of rack
which splits the Hrookside{Loal--Seam-and-sma.Ll_amounts__af ..coa1._
which- adheces_to the band. The rock bd'rfC`does weather to a fine)
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~ained materia l Representitive samples of t?Se material were
corl-acted {rom a stockpile on the Coal Sales Site which had
previously been crushed to a maximum size of about 1 1/2". The
samples were submitted to AC2 Laboritories in Steamboat Springs
for analysis inaccordance with Division guidelines. The results
of the analysis is shown of page 3. The results indicate that the
material has a very low potential for formation of acid or other
toxic materials. This may also be verified from results of sample
of mine water analyzed inaccordance with NPEDS discharge permits.
Mine development waste which may or may not be disposed of in the
site was tested during the preparation of the original
application. This material consists primarly of roof material
which falls and is separated from the coal and removed from the
mine. This material is constantly exposed to ground water pumped
from the mine. Any adverse effects should be reflected in the
mine water samples. No adverse effects have been noted to date.
Quantities of material to be wasted have been rather small to
date. It is anticipat ed that quanities will increase in the
future as efforts to improve the quality and amount of coal
produced increase. The w aste pile as shown on the drawings, will
accomodate approximately 50,000 tons ofi material. The size of the
pile is flexible and can be ad,iusted to the volume of waste
generated. Disturbance of the area will be regulated to
accomadate the volume of waste generated.
DEVELOPMENT OF THE WASTE AREA
Development of the waste area will require opening a roadway
approximstely 150 feet in length from the existing tipple ramp
2