IMPORTANT
NOTICE
UNITED STA TES
DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION
ADVANCE NOTICE Denver, Colorado, September 11, 1964
To all prospective bidders for construction of the DIVIDE, SOUTH FORK, AND CHAPMAN TUNNELS, WESTERN SLOPE COLLECTION SYSTEM, FRYINGPAN-ARKANSAS PROJECT, COLORADO.
The W~stern Slope Collection System of the Fryingpan-Arkansas Project con-sists of two segments. namely, the North Side and South Side Collection.Areas. The North Side system consists of approximately 30 miles of tunnels and/ or concrete conduits. The South Side system consists of approximately 20 miles of similar construction. The North Side system will extend as far as North Fork of Fryingpan River and the South Side system will extend to Hunter Creek. Both will terminate at the Fryingpan Diversion Works to be located at the confluence of the Fryingpan River and Marten Creek. At this point the combined flows will be diverted through the Divide Tunnel approximately 5. 3 miles long into Turquoise Lake (Sugar Loaf Reservoir).
Specifications for construction of the Divide Tunnel and the South Fork and Chapman Tunnels, features of South Side system, are planned for issuance in March 1965. Work is scheduled for completion in approximately 1, 300 days after notice to proceed. Approximate-locations of the tunnels are shown on the attached location map, Drawing No. 382-706-1322. Due to remoteness of the area and the elevation of the work (approximately eleva-tion 10, 000 feet). prospective bidders will probably not be able to inspect the job site at· bid "invitation time. . Plans are. therefore: being made so that interested bidders may be able to view the Western Slope portions of the work during the period of September 28 through October 2, 1964.
Assembly point for beginning of field trips for inspection of the work areas is about 50 miles east of Glenwood Springs, upstream of Norrie, Colorado, on the Fryingpan River. From this field assembly point, a total horseback ride of 5 hours is required for inspection of the inlet portal of the Chapman Tunnel, with the same length of ride required for inspection of the outlet of the Chapman Tunnel and the inlet of the South Fork Tunnel on the south fork
of the Fryingpan River. The \yest portal of the Divide Tunnel and the out-let portal of the South Fork Tunnel on the Fryingpan River can be reached by jeep. Weather permitting, a helicopter can also be used for aerial inspec-tion of all three sites and may be used in lieu of horses to reach the site of the inlet portal of the Chapman Tunnel or outlet portal of that tunnel and the inlet of the South Fork Tunnel on the south fork of the Fryingpan River. Helicopter landings can be made at the site of the inlet portal of the Chapman Tunnel and 1 mile downstream on the south fork for walking to the outlet of
Prospective bidders can make arrangements for helicopter service originating at the assembly point by contacting Mile High Aviation, Rifle,. Colorado,
Telephone No. 40. Prospective bidders can make arrangements for board, lodging, anµ horses at the assembly point by contacting Allan Craig,
Horseshoebend Resort, Basalt, Colorado, Telephone No. 2013. This is the only facility located adjacent to assembly point which can furnish all three services. Prospective bidders may arrange for other facilities or
services, if desired, as the above named are provided only as a matter of convenience. In .the event accommodations at the assembly point are not available because of prior commitments, if may be necessary to return to the Glenwood Springs area at night. The Government will not contract for, or provide, these services. Prospective bidders may engage this service on their own responsibility and the Government will ptqvide guides, if
desired. Prospective bidders interested in visiting the sites should contact the Construction· Engineer, Post Office Box'134, ·.Glenwood-8prings, Colorado, Telephone No. 945- 5446, Ar-ea Code 303, to arrange for guides and other general information. As much advance notice as possible to the Construc-tion Engineer for guides will be appreciated.
The .east portal of the Divide Tunnel usually may be visited by ordinary automobile at any tlme and trips to this area are not included in the above schedule. If desired, arrangements may be made for a guide for inspection of this area with the ·construction Engineer, Glenwood Springs, or by con-tacting the Project Manager at Pueblo, CQlorado, Post Office Box 515,
Telephone No. 5.44-;--5277, AreaCode 303.
The work required ,by the spe~ifications will consist of the. following items as shown on Drawing No. 382-706-1322, Location Map. Quantities shown below are those principal on:es for the work expected to be in the '
specifica-tions to give an idea of the scope of the work, and are preliminary only. The Government assumes no liability as to the accuracy of the quantities and reserves the ·:right to change them for the specifications schedule.
1. The Divide Tunnel is approximately 5. 3 miles long and will have an approximate 10-foot 6-inch diameter horseshoe-.. or circular- shaped, concrete-lined section. A concrete conduit with a Parshall Flume and stilling basin will lead from the east portal into the Lake Fork of the·
Arkansas Rive.r ..
Principal Estimated Quantities Excavation Concrete Structural-steel supports Timber Backfill Reinforcement 2 153, 000 cu yd 38, 000 cu yd . 1, 900, 000 pounds 450 Mbm 4, 000 cu yd 140, 000 pounds
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2. The South Fork Tunnel is approximately 3. 1 miles long and will have
an approximate 7-foot · 6.:.inch diameter horseshoe- or circular- shaped,
concrete-lined section.
Principal Estimated Quantities Excavation Concrete Structural-steel supports Timber 40, 000 cu yd 12, 000 cu yd 672, 000 pounds · 185 Mbm
3. The Chapman Tunnel is approximately 2. 6 miles long and will have an
approximate 9-foot 0-inch diameter horseshoe- or circular- shaped, ,
unlined section. Concrete lining will be required in the supported reaches.
The lined reaches will have an approximate 7-foot 6-inch diameter.
Principal Estimated Quantities Excavation Structural-'steel supports Timber Concrete 49, 000 cu yd 789, 000 pounds 185 Mbm 4, 000 cu yd
4. Diversion Works. Two different types of diversion works have been studied, only one of which will appear in the specifications. One plan requires a diversion dam across the valley below the tunnel portals of
sufficient height to retain the water already collected from higher
diver-sion points, and the flow from that particular stream. The water from the pond will enter the downstream tunnel through a gated intake structure and flow by gravity to the next diversion point.
The other plan utilizes a combination of buried free-flow conduit and
pres sure pipeline to conduct the water from the outlet portal of the
upstream tunnel across the valley to the inlet portal of the downstream
tunnel. This plan required a small diversion dam located above the
pipeline to divert the streamflow at that point into the downstream
tunnel via a covered conduit. .
The diversion dams in either plan will contain an adequate spillway to
pass floodflows and a gated turnout to control and measure downstream· fish releases.
Principal Estimated Quantities
(Rockfill diversion dams have been assumed) a. Fryingpan Diversion Works
Open Portal Plan Closed Conduit and Pipeline Plan
Excavation Rockfill in place Backfill Concrete Reinforcement 66, 000 cu yd 25, 000 cu yd 10, 000 cu yd 1, 600 cu yd 258, 000 pounds b. South Fork Diversion Works
Excavation
Rockfill in place Backfill
Concrete
Reinforcement
Open Portal Plan 37, 000 cu yd 21, 000 cu yd
3, 000 cu yd 700 cu yd
100, 000 pounds c. Chapman Diversion Works
61, 000 cu yd 12, 000 cu yd 14, 000 cu yd 1, 700 cu yd 283, 000 pounds
Closed Conduit and Pipeline Plan 31, 000 cu yd
7, 000 -cu yd
8, 000 cu yd
800 cu yd
130, 000 pounds
Open Portal Plan Closed Conduit and Pipeline Plan
Excavation Rockfill in place Backfill Concrete Reinforcement 23, 000 cu yd 26, 000 cu yd 2, 000 cu yd 500 cu yd 51, 000 pounds 17, 000 cu yd 6, 000 cu yd 2, 000 cu yd 400 cu yd 44, 000 pounds
5. If the contractor deems all or any part of the approximately 19 miles
of access roads to the western slope portals of the tunnels as shown on Drawing No. 382-706-1322 necessary to prosecute the work, the roads shall be constructed on alinement and grades as presently marked in the field. The costs for that access roadwork and any improvements to exist-ing roads, except as included in Paragraph 6 below, shall be included in
bid items for other items of work. The roads will have a minimum width of
12 feet, 0 inch and a maximum grade of 8 percent. Turnouts 200 feet
long, 10 feet wide intervisible or at 1, 000-foot intervals will be required.
6. Approximately 10 miles of road impro;vements to the existing county
road between Meredith, and Nast, Colorado, will be required.
Improve-ments will consist of widening the road to a minimum width of 26 feet,
O inch and providing 4 inches of compacted gravel surfacing. Payment
will be made for road improvement work.
'!
-Principal Estimated Quantities
County road improvements - excavation, all classes, 60, 000 cu yd County road improvements - surfacing, 17, 500 cu yd
7. A stockpile of concrete aggregate for future work will be required
at the west portal of the Divide Tunnel.
Principal Estimated Quantity
Stockpile concrete aggregate, 30, 000 cu yd
A ttachm'ent
B. P. Bellport Chief Engineer
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