PERMFILE42580

• Permit No: M2006016
• IBM Index Class Name: Permit File
• Doc Date: 5/1/2006
• Doc Name: Application Adequacy Issues
• From: Douglas L. Cooper
• To: DMG
• Media Type: D
• Archive: No

Douglas L. Conger
711 Hartman Road dconaer®aobrainstorm n ~
Cortez. CO 81321-4029 Ph: [phone]
[Voice -fax -Message]
\tav ], 2unr,
('ularado Division of Jlinerals S Geology
Dur;mgo I•icld Ot7icc
7(jl C'aminu del Rio. Room 125
Duranen. ('olurado SI +U1
Auuuian: 1Vallace H. Erickson
Subject: Perkins Sandstone Applieauon •4dayuacy Issues
112 Application \u. ~I 211(16-1116
Dear dir. Erickson:
1'he jollo+ving response; to )•our :ldeyuary Issues Itas been prepared in consultation with the applicant, and
correspunels +vith the sam< numbers in your fist.
~depuac~ Item irl 1
1. The application indicates that explosives will be utilized. Pursuant to Rule 6.4.4(i) and
6.5(4), please submit the appropriate analyses which demonstrate that off-site areas will not
be adversely affected by blasting. DMG recommends that the analyses address all structures
within one mile of the permit boundary.
Ali Stnne Response ;:1:
the blasting cunu~uci`tr• bus extensive blasting e~pcriene•c within the
local area and especially +citlt [Le suh~~~t lt.,).,a;, tian,l.i,+n. at this site. He utilises the t3ureau i)I
Reclamaaon blasting safety uulclin~,..::~_ (tali ~\ c~,mn:i,uu. ~ISHA traineJ, mtd yualit~~ as a licensed.
in.urrd blaster.
Blast vihruion data is acailahle I~am published values of the explosives ntanutitcturer. "When an explosive is
detonated rn the ground, three types o/ sersmrc waves acs generated Compressive, shear and surface i hese waves
can result rn structure response and on cars occasions seructure damage. Extensive research has provided for safe
blastrhg criteria based on peak panicle velocrty measured from the wave event " ' ('alcujatians using Dytu, >lohel
data sha++ that tt is rrl;uive simple to limit the shock ~ihratiun (acceleration) to a structurally safe ';-inch per
second syuarcd. out I+, a Iu,nUti-Ibot radius within a contirtuuus hail-rock bed,
The initial bLtstin~ plan tar the prujeet proposes 3',':-inch drilled hole diameter ti,r :!n S-foot renter-to-center
pattern in Za- to 36-foot hale depths and lU- by IU-hole ro++s. L sing the li,llowing
• I' milli-second n•unklixe b 25 milli-second lateral delays.
• AVI~(1 Dynomix cxpiosi+e charge
• Red-I IB. F.!-bets non-electric (gasy initiation
A po,ode~r Jncror al I.liit 7'('1' a ill t~arture a volume of S6.St) ('}' per hole per delay (2J-li,ot depths) with
>G.s9 pounds of r~plosivr.