2002-04-12_PERMIT FILE - M2002052 ‎(26)‎

• Permit No: M2002052
• IBM Index Class Name: Permit File
• Doc Date: 4/12/2002
• Doc Name: Permit Application
• From: Western Equipment & Truck Inc.
• To: DMG
• Media Type: D
• Archive: No

January 14, 2002
Nature's Park
2055 1St Avenue
Greeley, Colorado 80631
Attn: Mr. Bob Condon
Re: Gravel Evaluation
Saddlehorn Ranch Site
NE of Highways 257 and 60 -Milliken, Colorado
Terracon Project No. 21015138
l~~rr~con
1289 First Avenue
P.O. eox 1744
Greeley, Colorado 6 06 32-1 744
[phone] Fax: [phone]
Terracon has completed a geotechnical engineering exploration for the proposed gravel pit to be
located at the confluence of the Big and Little Thompson rivers in Milliken Colorado. This study was
performed in general accordance with our proposal number P2101154g (revision 1) dated November
5. 2001.
The results of our engineering study, including the boring location diagram, laboratory test results,
test boring records, and our findings needed to aid in the evaluation of the site as an economic
source of sand and gravel are attached.
The overburden soils at the site consisted of six inches of topsoil underlain by silty sand, sandy silt
and sandy lean clay. Sand and fine gravel underlie the overburden in the majority of the site and
extend to the bedrock below. The bedrock was encountered at depths of 16 to 35 feet below the
surface. The results of our field exploration and laboratory testing indicate that good quality sand and
fine gravel suitable for use in some construction materials were encountered in large quantities at the
site.
Based on our engineering analyses and additional data provided by the client, approximately 950,000
cubic yards of sand and fine gravel exist within the proposed gravel pit the site as outlined in our site
plan, Appendix A. Within this same area, approximately 260,000 cubic yards of overburden would
have to be removed to obtain the sand and fine gravel. Since the majority of the aggregate is below
groundwater, dewatering of the site will be required to mine the material.
Additionally, it is our understanding the site may be developed into a storage pond following the
completion of gravel excavation. Based on our observations of the siltstone/claystone bedrock
generally encountered beneath the sand and gravel, the siltstone/claystone bedrock materials appear
suitable for use as liner material along the side walls of the storage pond. However, lenses of
sandstone bedrock were encountered at the site which would not be considered suitable for lining of
the storage pond. Laboratory evaluation of the bedrock materials for use as a storage pond lining is
recommended prior to its use to determine the permeability and ensure the suitability of the material
for use as a liner.
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