HomeMy WebLinkAboutPreliminary Estimate of Timber Ridge RockFall Mitigation walls
Memorandum
Alpine Eng. Inc.
Rick Pylman ,
To:
CC:
Steve Pawlack
Glenn Palmer AEI, 970-926-3373ph. 970-926-3390(fax)
From:
March 9, 2010
Date:
Preliminary Estimate of Timber Ridge RockFall Mitigation walls
Re:
__________________________________________________________
THe following preliminary opinion of probable construction costs is based upon:
1. Preliminary coordination with Hp Geotech: re their rockfall study.
2. Averaging quantities over the site using ONLY 3 cross sections.
3. Unknown construction logistics and requirements:
a. The temporary cut on the west side is approaching 20 feet tall, where OSHA
requirements no longer apply. The soils eng should verify the steepness of temporary
slopes; If flatter than 1:1, a shoring wall will be needed to construct the fill wall (not
included. (I assume 1.5 to 1 will be required).
b. I assume fill will need to be brought in to temporarily bring grade up to get a drill rig to
within 6 feet of the top of the shoring walls, to replace the exist wire basket gabion
walls.
c. Wall fascia (I provided a range of $10/sf for stained/textured concrete, to $40/sf for
something better.
d. If wire net fence posts go thru MSE wall geogrid: how close to the wall face can the
post be, etc.
e. In order to break up the western fill wall into sections less than 11 feet tall, I assumed
that the wall would be MSE with Keystone/Pavestone block face. Since the overall
height of the adjacent walls is about 24 feet high, I assume the geogrid will be approx
0.7(H) = 17 feet wide, which is a little wider than average, and could increase costs.
(IF the walls are cast in place concrete, which might be better for fence post
embedment, we would typically need one wall 24 feet tall 5 feet horiz away from a 14
foot high wall (OR 38 feet height of wall) so the upper wall doesn’t surcharge the lower
one.
f. Global Stabilty requirements could increase costs.
Section #1 (East of parking structure).
310 lf 14 foot MSE wall = 4340 sf @45$/sf = $195,300.
Excavation for wall 1300 CY at $17/CY= $22,100.
(assume with haul out, then haul back in)
Embankment with haul 2630 CY at $17/CY = $44,710
Temporary Jersey barrier on Lionsridge Loop $10,000.
Temp Relocate Phone lines above ground, 900 lf at $12/lf = $10,800
Perm Relocate Phone lines buried 900 lf at $17/lf = $15,300
Section #2 (Adjacent to Parking Structure)
Additional Fill 1271 CY at 17$/CY= $21,600
Cable Supports or other means to support Fence posts thru foam fill $10,000
June 30, 2014
Section #3 (West of Parking Structure)
$7320
Bring in fill to provide a bench next to gabion walls, to drill new shotcrete wall 1830cy@4$=
Remove temporary bench (above) $7320
Shotcrete wall to replace exist gabion wall (21x 170 @$40/sf) = $142,800
Shotcrete wall fascia (19 x 170= 3230sf at $10- $40/sf= $32,300- $129,200
MSE fill wall (MSE/block) 24 x 350 x $42/sf = $352,800
Wall Drain 350 lf at $14/lf = $4900.
Excavation with Haul 2800 CY at $17/cy= $47,600
Embankment with haul 8200 cy at $17/cy= $139,400.
Subtotal= $1,064,250- $1,161,50
With 10% contingency $1,280,000
.
Does NOT include wire net fence costs.
If you have any questions, please call.
Glenn Palmer, PE
TimberRidgeRockfallStudyCosts.docx
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