PERMFILE125165

• Permit No: M2000016
• IBM Index Class Name: Permit File
• Doc Date: 5/4/2000
• Doc Name: ADEQUACY RESPONSE DTD 5-2-00 MOBILE PRE MIX CONCRETE INC RIVERBEND PIT FN M-00-016
• From: DMG
• To: GREGG SQUIRE
• Media Type: D
• Archive: No

• III IIIIIIIIIIIII III
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenr of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
DATE: May 4, 2000
TO: Gregg Squire
FROM: Allen Sorenson ~I `~/

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1
RE: Adequacy Response Dated May 2, 2000, Mobile Pre-Mix Concrete Inc.,
Riverbend Pit, File No. M-00-016
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MINING•SAFETY
Hill Owens
GOVernO!
Greg E. Walther
Exec W ive Dueaor
Michael B. Long
Division Director
The following application adequacy items are limited to the portions of the application adequacy
response dated May 2, 2000 labeled "Response to Mr. Allen Sorenson Commeyt Submitted on-April
13,2000."
In order to obtain 20 percent liner replacementcos[ bonding,the Applicant has provided desi~u '
drawings and specifications for the installation of the pit liner along with a quality assurance/quality
control plan. These documents will be binding under the terms of the permit. The following
additional specifications. statements, and modifications must be provided for the Division to
approve the liner plan and accept the proposed 20 percent liner bond.
• The Division will regL:lre a stdtcment that the plans and specifications, once approved, could not be
altered without consent by the Division.
• The moisture content specification should be changed to no more than 1 percent dry of optimum for
the clay/shale core. (zone I) material. Lower permeability will result if the material is compacted
slightly wet of optimum.
• The applicant must provide a specification for maximum loose lift thickness for placement of zone
1 and zone 2 materials.
• 'Cite applicant must provide specifications for gradation and plasticity of zone 1 material.
2. The Applicant states that protective measures recommended by the Urban Drainage and Flood
Control District will be employed to stabilize the areas between the pit and the river. These
protective measures will allow the Operator to mine within 200 feet of the river and within 100 fee[
during the low flow season. The Urban Drainage and Flood Control District recommendations are
contained in the publication "Technical Review Guidelines for Gravel Mining Activities,"
December 1987. The Applicant must describe which of the recommended protective measures will
be employed and where they will be installed. The Applicant must further provide a cost estimate
fo; the installation of the protective measures. The Division must bond for their installation to
assure that the riverside berms will be adequately stabilized in the event of permit revocation and
bond forfeiture.