Att1_Reposted_Angostura_Dam_Rep_Sources_Sought_12_21_2023_2.pdf

IN REPLY REFER TO:

United States Department of the Interior

BUREAU OF RECLAMATION

Missouri Basin Regional Office

P.O. Box 36900

Billings, MT 59107-6900

This is a Sources Sought Announcement for the

ANGOSTURA DAM SPILLWAY CONCRETE REPAIR

Pick-Sloan Missouri Basin Program

South Dakota

This is a revised and reposted announcement which will be used for market research and advanced planning purposes. Proposals are not requested and will not be accepted from this Sources

Sought Notice. THIS IS NOT A SOLICITATION FOR PROPOSALS AND A CONTRACT WILL

NOT BE AWARDED AS A RESULT OF THIS NOTICE.

The NAICS Code for this project is 237990 Other Heavy and Civil Engineering Construction with a business size standard of $45 million. In accordance with FAR 36.204, the estimated magnitude of this proposed construction project is between $5,000,000 and $10,000,000.

The location is located at Angostura Dam, approximately 10 miles south of Hot Springs, South

Dakota, in Fall River County. The dam is located 2.8 miles southwest of US Highway 18 and is accessible via North Angostura Road (County Highway 1A), and North Dam Road.

The Angostura Dam is a 967-foot-long concrete gravity structure (west), 1,063-foot-long zoned earth embankment (east, with 136 feet of hydraulic height and 123,048-acre feet of storage capacity. The spillway has five-50 foot wide by 30 feet tall radial gates. The mass concrete overflow crest elevation is 3157.2 feet, poured in 50foot lifts, with slotted large-radius bucket and stilling basin. The design capacity is 247,000 cfs at Max WST 3198.1 ft (top of radial gates).

Primary Issues to be resolved by the project work:

1) Constant seepage under the radial gates and through block joints and lift lines of mass concrete spillway structure.

2) Freeze-thaw cycling above waterline causes delamination and spalling across the downstream face, primarily along the block joints and lift lines.

3) Expansive aggregate popouts (6-inch minus).

4) Previous concrete repairs have failed, and 50% protrude up to ¾ inches above original grade.

5) Rough spillway surface may lead to further damage during high flows.

6) Water will remain on the radial gates during construction

7) Stilling basin has unknown wall seepage and groundwater conditions, as the stilling basin has never been dewatered.

Principal components of work to be performed under these specifications include the following:

1. Removing and replacing damaged concrete on the downstream face of the spillway. Current repair plans include, but are not limited to:

• Removing approximately 4,500 total square feet of concrete (in multiple repair locations) to a depth of six inches

• Installing lateral reinforcement bars at each of the repair locations

• Preparing the exposed surfaces for concrete placement

• Placing new cast-in-place concrete or shotcrete to the original grade, and

• Trowel-finishing the surface to a tolerance of 1/8-inch (abrupt) or 1/32-inch (gradual).

2. Construction constraints include the following:

• Vehicular and equipment access to the spillway is very limited. The concrete portion of the dam crest is only 9 feet wide, and no vehicular access is permitted across the metal grated bridge deck above the radial gates. Side access is limited to 50 feet away on one side only. An old service road leads to an abandoned powerplant near the river channel downstream, but it is currently inadequate for heavy traffic and does not provide access to the riverbed or stilling basin.

• The anticipated spillway construction window is between August 15 and November

30 to avoid potential flood releases through the spillway.

• The reservoir cannot be lowered during construction, so water will remain on the radial gates.

• The stilling basin cannot be dewatered, and allowing material to fall into it should be avoided.

• In accordance with State law, the Government may arrange for removal of the long-eared bat, with the implication being that trees may only be cut between November

1st through April 14th of the respective calendar year(s) to build and/or maintain the temporary roadway to the face of the dam.

3. Improving the Angostura Dam access road.

4. Extending a temporary access road into the river channel downstream of the spillway.

5. Removing the temporary access road from the river channel to bring back the river channel area to its natural state. Removal of the temporary access road need not be accomplished by

November 30th.

The Government is seeking interested and capable SBA 8(a) companies, small businesses, small-disadvantaged businesses, woman-owned small businesses, HubZone small businesses and/or service-disabled veteran owned small business, and Indian Small Business Economic Enterprises who have the specialized knowledge, experience, and resources necessary to successfully complete a project of this size, scope, and complexity.

The Government will not reimburse any costs associated with responding to this Sources Sought

Notice. This notice shall not be construed as a commitment by the Government to issue a solicitation or ultimately award a contract, nor does it restrict the Government to a particular acquisition approach. The Government will not be bound to this information if a solicitation is issued. A determination by the Government not to compete this proposed contract action, based on the responses to this notice, is at the discretion of the Government.

For market research and planning purposes, please submit a Capability Statement to

Contract Specialist Mitchell Frost at mfrost@usbr.gov by 5:00 p.m. MST on January 5, 2024.

For record keeping purposes, telephonic inquiries will not be accepted.

It is important to include the following in submission of your company’s capability statement:

1) bonding capacity,

2) evidence of contracts (on dams) having similar size, scope, and complexity of construction work as this project, and

3) business size/socio economic status.

For informational purposes only, the following pictures are provided to demonstrate the size, scope, and complexity under this Sources Sought, for the project work at Angostura Dam, South Dakota.

mailto:mfrost@usbr.gov