REP38861

• Permit No: C1981041
• IBM Index Class Name: Report
• Doc Date: 8/1/1997
• Doc Name: ROADSIDE REFUSE DISPOSAL AREAS APPLICABLE DOCUMENTATION MEMO
• Permit Index Doc Type: Waste Pile/Fill Report
• Media Type: D
• Archive: No

. .;
POWDERHORN
COAL COMPANY
August 29, 1988 ''
C.n ~-~ ~r i~ c~ 4,c
Michael S. Savage
Colorado Mined Land Reclamation Division ,,•tJG3 ~ 1°~8,
1313 Sherman Street, Room 215
Denver, CO 80203-2273 i?lf1•.~~,= L~,;•;G
Re: Cameo Refuse Disposal Area No. 1, Permit No. C-81-041
Dear Mr. Savage:
' ~.
As discussed August 18 on the phone, Powderhorn Coal Company would like to
respond to your letter dated July 6, 1968, by addressing drainage at this time
and requesting postponement of:i<he stability evaluation of our Cameo Refuse
Disposal Area No.l (CRDA-1) to a3,later date.
Experience with our Roadside Refuse Piae indicated that seepage out of the
face of the pile may occur for some time after placement of material. Stability
evaluation of this pile subsequent to more questionable placement techniques
revealed a stable configuration. Tight control of refuse placement at the
CRDA-1 has been documented by quarterly certifications of the pile. The lack
of discharge from 2 of the 3 underdrains substantiates our belief that the
seeps are small isolated perched aquifers. The higher than expected water
levels in the piezometers are believed to be a result of penetrating isolated
perched aquifers thereby representing the water elevation in the aquifer.
Considering this information and our status of being in temporary cessation,
we request that the requirement for additional stability evaluation be postponed
until the pile is needed for refuse placement or until reclamation of the pile
is started.
The following are our responses to the questions on drainage addressed by OSM
is their Technical Topic Supplement from their visit May 9, 1988:
-Page 1, 9 2 - A field minor modification (MR12) was granted August 24,
1988, to eliminate the requirement fora berm and replace it with a ditch
between the road and the pile. further information on this minor modification
will be submitted to the division by September 9, 1988.
-Page 1, 9 3 - This Public Service ditch was also covered in the MR12
because of drainage control changes made in this ditch. The ditch between
the pile and the road will eliminate our discharge into this ditch.
-Page 2, 9 1 & 2 - The design of the collection ditches in question was
included in our permit renewal and was added to the permit as Appendix
AAA.
POWDERHORN COAL COMPANY • P.O. BOX 1430 • Palisade, Colorado 81526 • [phone]