Upstream Trash Rack Repairs, Two Rivers Dam

This action was awarded as an 8(a) Sole Source Set-Aside under the authority of section 8(a) of the Small Business Act. In accordance with these specifications the Contractor shall supply all plant, labor, materials, appurtenances, equipment, shop facilities, supervision, tools, staging, scaffolding and any other items necessary to complete the herein detailed improvements to the upstream trash rack at the Two Rivers Dam/Diamond A Dam, Roswell, Chaves County, New Mexico. The existing upstream trash rack at Two Rivers Dam is still serviceable but requires bank and streambed stabilization upstream and downstream. Project also requires subsurface investigation and geotechnical report in the area of the trash rack for use in future projects. Specific work items to be covered by this contract are listed below: 1.1.1 Survey. Establish and stake position of the erosion control features in accordance with the specifications herein and the plans (Attachment 1 -Separately Attached). Provide vertical control (temporary bench mark) in reasonably close proximity to the structure to allow for verification of finish elevation for the various components of the construction effort. 1.1.2 Geotechnical Investigation. The Contractor shall conduct subsurface field investigations within the proposed site using methods (soil borings, test pits, cone penetrometer tests, in-situ tests or other methods) best suited to the site conditions as defined during the site reconnaissance and complexity of the proposed design. The Contractor shall provide all water necessary for drilling. In exploratory borings, standard penetration tests (ASTM D1586), jar sampling and bulk sampling must be conducted to provide disturbed samples that are suitable for determining soil type, Atterberg limits, Modified Proctor Compaction testing (ASTM D1557), USCS Classification tests (ASTM D2487) and other index tests. Where cohesive (soft) soils are encountered relatively undisturbed samples shall be collected (Shelby tube, Modified California, or similar sampling method) at the stratum encountered. The subsurface investigation shall consist of a minimum of six (6) borings located within the footprint of all proposed supported structures and each boring shall be drilled to a minimum of 20 feet below ground surface. Additional borings and deeper depths may be proposed by the Contractor to better characterize the site. Refer to the plans for boring locations. Standard Penetration Test (SPT) sampling intervals shall be conducted every 2.5 vertical feet in all exploratory borings and 50-lb bulk samples obtained from each boring. If refusal is encountered on rock material, continuous rock coring shall not be authorized. Refusal shall be considered at 50 hammer blows within 6". However, if 50 hammer blows have been reached at the 6" mark, the driller shall be directed to continue counts and refusal will be deemed at 100 hammer blows within 12".