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REV104070
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REV104070
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Entry Properties
Last modified
8/25/2016 1:15:10 AM
Creation date
11/22/2007 1:13:20 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1994097
IBM Index Class Name
Revision
Doc Date
7/5/1996
Doc Name
DELTA SAND & GRAVEL CO SPRING CREEK PIT AMENDMENT MLRB PN M-94-097
From
ENVIRONMENT INC
To
DMG
Type & Sequence
AM1
Media Type
D
Archive
No
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~ ~ ~IIIIIIIIIIIIIIIIIII` <br />Er~vir~r~rr~er~~, Ir~c. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />PRESIDENT ARVADA, COLORADO 80003 <br />303.423-7297 <br />July 2, 1996 <br />Mr. Bob Oswald <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />Miner..lg Section. - Snuth <br />1313 Sherman Street, Suite 215 <br />Denver, CO 80203 <br />o1=r.FIVtD <br />~ui• p5 196 <br />Division of Minerals 8 Geology <br />Dear Bob: <br />RE: Delta Sand and Gravel, CO., <br />Spring Creek Pit Amendment <br />MLRB Permit N M-94-097 <br />After reviewing your most recent bond calculations I have concerns with some of <br />your analysis. I can agree with your unit costs, but some of the volumes and resulting costs <br />are where we differ. I will try to address ease concerns by the TASx number used in your <br />bond analysis printout. After reviewing your numbers I prepared a new bond cost analysis. <br />It is attached for your review, as you go thru my comments on each Tasx. <br />TASK #1 - HIGI-IWALL REDUCTION, my concern here deals with the swell factor you used <br />when figuring the volume of dirt that wouid need to be moved. 1 do not believe a swell <br />factor is necessary here because the slopes to be created have a finite volume. If you add a <br />swell percentage factor to the amount being placed there would be an excess amount of <br />material left after the cut/fill process is done. Since compaction of the material occurs as the <br />slope is created and very seldom does this compaction approach 100'%, the cudfill process <br />will actually produce an excess of material. To effectively calculate the amount of material <br />needed, is to multiply the bank measure fill volume needed by a shrink factor of some sort, <br />say 85%. This would mean to obtain the 12,950 cubic yards we would have to cut 11,008 <br />cubic yards since the swell that occurs and the compaction that takes place do not totally <br />offset each other. The 12,950 cubic yards are a bank fill number used to calculate a bond <br />
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