2020-09-08_PERMIT FILE - M2020029

• Permit No: M2020029
• IBM Index Class Name: Permit File
• Doc Date: 9/8/2020
• Doc Name: Adequacy Review Response
• From: Applegate Group Inc.
• To: DRMS
• Email Name: DC1
• Media Type: D
• Archive: No

Mr. Daniel Cunningham
RE:Kiewit Carr Sand&Gravel(M-2020-029)Response to Adequacy Review Comments
August 27, 2020
Page 3 of 4
20. Topsoil stockpiles will be stabilized by seeding and mulching. Unless the DRMS has
specific guidance to offer at this time, the quantity of seeding and mulching will be in line
with Weld County standards and will be established during the Weld County Use by
Special Review(USR)permitting process.
21. Mulch will be crimped into place. Unless the DRMS has specific guidance to offer at this
time, the quantity of mulch per acre will be in line with Weld County standards and will
be established during the Weld County USR permitting process.
Rule 6.4.6 Exhibit F—Reclamation Plan May
22.An updated Exhibit F with revised contours is attached.
23. The updated Exhibit F depicts the proposed final land use for the site (rangeland).
24. The updated Exhibit F includes the name of the applicant and is signed by the PE who
prepared the maps.
Rule 6.4.7 Exhibit G—Water Information
25. Kiewit does not expect to directly affect surface or groundwater surfaces during this mine
operation. There are no perennial or ephemeral surface streams within the areas to be
mined, and all material to be mined is above the groundwater table. The potential culvert
to be installed across Lone Tree Creek will be removed during final reclamation. Kiewit's
best management practices to protect the groundwater system from potential spills of fuel,
oil, lubricant etc. are included in the updated Exhibit G attached.
26. An updated Exhibit G with an additional narrative on the BMP's to be implemented is
attached.
27. Kiewit will not be conducting dewatering operations at this mine.
28. At this time,the likely source of water to supply the 20,000 gallons per day for dust control
is a contract with the Triton Water Depot at 20660 Niobrara Blvd, LaSalle, CO 80645.
This water will be trucked to the site. It is possible that an alternative source of water will
be secured; this water will also be trucked to the site.
Rule 6.4.8 Exhibit H—Wildlife Information
29. If the initial site disturbance occurs before red-tailed hawk nesting season (February 15-
July 15), a single site visit should be sufficient to confirm that the nest is inactive. If initial
site disturbance occurs after July 15,two to three site visits separated by several days would
be needed to determine presence or absence
Rule 6.4.13 Exhibit M—Other Permit and Licenses
30. Kiewit has implemented a Spill Prevention Control and Countermeasures(SPCC)program
for this site as further explained in the revised Exhibit G attached.
www.applegategroup.com Denver • Glenwood Springs • Hotchkiss [phone]