2008-10-24_REPORT - M2005071

• Permit No: M2005071
• IBM Index Class Name: REPORT
• Doc Date: 10/24/2008
• Doc Name: Vibration Monitoring Results
• From: DRMS-acs
• To: DRMS-sss
• Permit Index Doc Type: Blasting
• Email Name: ACS
• Media Type: D
• Archive: No

- IJtA.13LNt.St.onc'6bin 31 :seismic`. urvcy Environmental Assessment Page "?4h 7
_ The gently northeast dipping surfaces of the plateau within. -theProject Area are dissected by southwest.to
Hartbeest treatding cartyc ns (t°i fists 1-111, Exposed in the. Project Area's canyons are the upper and middle
rnemDers of I* Green River Formotlon (Weiss of, alt 199.0). Rocks of the lower Colton Formation ore=exposed.
only in the easternmost portion of the Project Area in the lower reach o0ack.Creek C6nyorz, Yi ese_canybhs
begin in the higNands near the Roan Cliffs and become increasingly tie-eper toward Nine Mlle Cr-eek:Canyon to
ilia northeast apd the Qrgan R1ver'a 9e$01ation Canyon t4 thQ a1 :
$lopes in the: canyonia rnostly range from 40-to 50-poraont; however; Moth lei >s staep°and even steaper sliipes
occur In the canyons throughout the Project Area. In localized situations siopes'reech near vortical along the edge
of the plateau surface--an
(Hn the bottoms where -stream :action has cut vertical walls and cle€trod the egll4vIO
and fallen rocks- Rack fill is the main.-form of mass wastin in thhe_PTJect Area's,_r_an ons. Qnly bne landslide teas
been :mapped in thQ PrggeGt Area (Harty 1881); the ?sliefe_isl o-I t-ad in a; cariy?n"trfi 4b ?+?o .lack Creek G?nygri in
Section 18, T13S, R19E. The mostly consolidated rocks of the Green River FOrmatiop are mostly stabtb when
expo e4d and-this stability tends to the perseverance of Cliffs-in the Project Area. Rack fatis ;ace caused 1o y?.
forces of orosion in the form of freezelthaw-actians-and gravity as the.rocks. sIoLk9h off Elo over time.
Oland gas,prodoction In the Project Artie comes from several anticlinal geologic slruclures that have been
successfully drilled for gab (Weiss, at. al. 1990)'-The mdjik units In this area are Prickly Pecor, 490.0ariyon, l2eters
Paint, end Nln,e Mile Pre ugtlgn from- the Paters Point-Stone Cabin Oas unit produce primarily gp5.004; in the
past. some oil from the Green River and Colton formations at a depths of 2;800 to 4,300 feet (UGAP 1 "1.,M- S.
and USES ills, and Weiss eG al. 1 4), Thera are currently 1€3 wells capable of producing natural gas in the
Project Area (F-igura 1A).
A; oetpesit of bituminous err asphattlc sandstones, sometimes call tar sands, do(lnod as the Sunnyside Deposit
unOorlres mynah-of they wostam part of the Project Area (UGS and UEE$1996Y The bituminous zone compr?.saig,
this depq_?it fe incoudeo in the middle and lower members of the Green River kgmatlon arid-the-upper portion of
the. Calton FormatIPA. The-$wnpysiide Deposit is-the lergdst tar sand deposit in this region. The doposlt'S outcrop
is Oposed along. the western side of the l (*n Cliffs, 'there are also reAortect oxpos aro.ef pxtensions of this
- -tlpposit in C;ottornwbod. Jagt .?, and Nine Mile Cenyons.
€xgosures-below the-Roan .Cliffs. were mined for paving material up:to the late-1940 s. Covington aria Young
(1986) suggested. that nearly. 300 million garrets of petroleum ere:recoveraOle in the area. in the 1 Jfi0's; and early
198.04s..testa of in-situ extraction methods. Involving the- rrtjeotion of hot water or steam to extract liquid ftetroleurm
from-the tar sands-were not commercially successful.
3;21. En4Jrontner taI,,Consoge.snces
3.2.1.2.1 Alternatl.mA- - Proposed Actlon
The drilling of shot holes: to receive the explosives placed at depths of W or-69 feet 05 pilrt ;pf the Pcopwed
- •- AcOn weiilct v6jate a pptgntlsl path (or-su4aca water to prow Into the drilled hole anal to *enttally ocebmulpte
where the waler.gogld possibly free?p during periods of fr6ozino temperatures i5r'possihl? producetaturatri±
copditloniOn stil urface .gagiggild mntI-rigls and s '§? @quent rock movement. especially if holes were located
close to'cliff or eiscarpment'edg * Howav&,, poler?tipl offerrtsgf w0or a"uinulatiog in open shot, holes would not
likely occur as the holes are immediately packed with explosive following drilling fotlowpd by tho hole bning
back-filled with cuttings up to within about three feet of the surface where at plug is tns+ertgd into tho hole try sgftl
the bole. Above the plug, additional cuttings antl aoil are ridded to thb hoWto complete llhe bIckf4l1o the ?o fAi;e,
The back fill and the ping W uid likely preclude city infiltration cos water,-and backiflling to the surface would
prevent'water. collecting and being channeled into.the hole. Tilerefore. any.Impacts to rocks peraelrated by the
drilling of shot holes by the eliannetWlion of water Into the holes . ou)d be prevented.
The. detonation of the roxpiosivcr shots at depths of SQ and,t 9 fdP*fOF buggy drill a ? .boil-portable: drill haled;
respectively, would initially result In peak particle -velocilles or vibrations greater than 0.78 Inches per socpnrl at
the point of dotpnalicln-and would dintiniirh with `distance.Pga partlr3te vetercttias at the ba standing`
stnactures.an. rock art should notes 0.7 ingh® per s pnf# threshold rrriteriron reported b the.`8l Mtn
f-la dnook 3.150, tliustratiori 10? Rdsource Froteckiort Offsets, for Cut ur_'al Rn our aa`$ cliitp0 eis Qthsr ciliti®s.
BILM's recommended safe distances from b.urTBo;shots toiiulturill rospUrcra sCnnctures end other fBCies a sa about
284 and.199 feet for 20 pounds-of xplosive at a-dopth 0 60 feat for'buggy drilled-source p6int941nd 1 a pvt,rids of
explosive at 50 feet fear hell:-Portable drilled source points, respectively.
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