0005 Catawba Falls Trail - Supplemental_Specification_939.02.pdf
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- Solicitation number
- 12445122R0002
- Issued by
-
Department of Agriculture Forest Service
About this file
This federal contract opportunity solicitation requests proposals for a trail improvement project located in the Pisgah National Forest in North Carolina. The project scope includes slide repair with a retaining wall constructed using micropiles as specified in the technical specification. Additional work includes native surface trail construction, boardwalk construction, staircase construction, and an elevated viewing platform. Materials will include cast in place concrete, gabion, wood, and steel, with some components requiring off-site fabrication. The remote site poses challenges including stream crossings, limited access, rock slopes, and high public use. Proposals are due February 18, 2022. The period of performance is expected from March 14, 2022 to March 13, 2023 based on notice to proceed. The contract type will be firm-fixed price. The magnitude is between $500,000 to $1,000,000. The solicitation is a total small business set-aside under NAICS code 237310 for highway, street, and bridge construction.
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Text version
939.02 – Construct Micro-Pile Retaining Wall
Description
939.02.01 This work consists of the construction of a reinforced concrete micro pile retaining wall as well as the fabrication and installation of rail post base plates on top of the completed wall.
Materials
939.02.02 A reinforced concrete micro pile retaining wall shall be provided in accordance with the project drawings contained within the project plans. Reinforced concrete shall be minimum
28-day compressive strength of 3,000 psi. Reinforcing steel shall be ASTM A615, Grade 60 steel. Steel pipe piles (casing) used in construction of the retaining wall shall be API N-80 with a nominal yield stress of 80 ksi and cross section as shown on the drawings. Base plates for the rail posts shall be as described in the “General Notes” as well as the hardware to install the base plates on top of the completed micropile wall. Schedule 40 2” PVC shall be used for the weepholes at the bottom of the wall. Washed stone shall be used to backfill the wall to ensure drainage except for the last 2’ of exposed fill which shall be native material. Contractor shall submit proposed methods of drilling and grouting prior to beginning construction, which shall be approved by the COR and/or Engineer of Record.
Construction
939.02.03 Construct the micropile wall at the location SHOWN ON THE PLANS. Minimum length below ground shall be 10’ total with casing to extend minimum 5’ into rock. Micropile construction method shall be Type A with the casing left in place as the reinforcement for the wall. Minimum compressive strength 5,000 psi grout shall be utilized to fill the casing with a #10 bar in the center of the casing. Rail post base plates may be anchored by pushing into fresh concrete or epoxy anchored after concrete setting.
Measurement and Payment
939.02.04 Measurement of this pay item shall be made at the unit price LS for Micropile
Retaining Wall installed and approved and payment will be full compensation for the work prescribed in this section and as SHOWN ON THE PLANS.
DocuSign Envelope ID: 8F37D36C-6C45-4498-BE28-011DB437C75C
11/29/2021
| 2021-11-29T12:03:53-0800 | |
| Digitally verifiable PDF exported from www.docusign.com |
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