2011-08-12_REVISION - M1978210

• Permit No: M1978210
• IBM Index Class Name: REVISION
• Doc Date: 8/12/2011
• Doc Name: Response to Comments
• From: Weld County
• To: DRMS
• Type & Sequence: TR3
• Email Name: MAC
• Media Type: D
• Archive: No

August 10, 2011
Colorado Division of Reclamatio
Attention: Michael Cunningham
1313 Sherman Street, Room 215
Denver, Co 80203
fining and Safety
RE: Response to Comments, Technical Revision 3, Permit # M- 1978 -210
Dear Mr. Cunningham,
Enclosed please find the response to your comments dated August 10, 2011.
PUBLIC WORKS DEPARTMENT
1111 H STREET, P.O. BOX 758
GREELEY, COLORADO 80632
WEBSITE: www.co.weld.co.us
PHONE: [phone]
FAX: [phone]
'iu '12 N11
Division of Reclamation,
Mining & Safety
Response 1: Weld County's affirmation of clean and inert materials is attached.
RECEIVED
Comment 1: The Applicant has indicated clay borrow material will be imported from offsite and
used to backfill the slurry trench. Construction Materials Rule 3.1.5(9) states that if an Operator
intends to backfill inert structural fill generated outside of the approved permit area, it is the
Operator's responsibility to provide the Office notice of any proposed backfill activity not
identified in the approved Reclamation Plan. In accordance with Rule 3.1.5(9), the Operator shall
submit signed affidavit certifying that the material is clean and inert.
Comment 2: The Site Plan Map shows a water line will bisect the slurry wall at two points.
Please describe the techniques which will be used to prevent groundwater seepage around the
water line. In addition, please provide the Division with a typical design drawing showing the
crossing of the water line.
Response 2: The City of Greeley's water line will be crossed twice during the construction of the
slurry wall. The City of Greeley requires that their water line be encased using a 30" split steel
pipe. The split steel pipe will extend 10 feet beyond both sides of the slurry wall. Once the water
line is encased within the steel pipe, the steel pipe will be welded back together. The ends of the
steel pipe will be sealed using watertight gaskets that will prevent the migration of groundwater
through the slurry wall. The water line crossings will be thoroughly examined for leakage during
Division of Water Resources required leak test. The City of Greeley's typical detail for water line
crossings is attached.
M:\DAVE B \Geisert Pit\DRMS Permit Amendment\Response to TR3 Comments 8- 10- 11.doc