Bureau of Reclamation, Contracts Group, 1150 N. Curtis Road, Boise, Idaho 83706-1234

Y -- STONE COLUMN TEST SECTION, SALMON LAKE DAM, OKANOGAN PROJECT, WASHINGTON SOL 1425-97-SI-10-07330 DUE 051297 POC Contact Susie Zimmer 208-378-5156/Terry K. Ford, Jr., Contracting Officer 208-378-5100 The Bureau of Reclamation has a requirement for a stone column (with wick drains) test section to be installed at the downstream toe of Salmon Lake Dam. Salmon Lake Dam is located in north-central Washington State, in Okanogan County, immediately upstream from the town of Conconully. The purpose of this test section is to investigate the effectiveness of stone columns with wick drains as a ground improvement method for liquefaction remediation and to optimize the final treatment design by comparing foundation strengths before and after wick drain and stone column installation. The test section is needed because the foundation at Salmon Lake Dam is composed of liquefiable layers with a high percentage of low-plasticity fines interbedded with dense gravels, both of which could hamper the installation and/or the effectiveness of the stone columns. Work will include: installation of temporary fencing, site leveling/excavation and the preparation of a gravel working surface, controlling ground/surface/ construction waters, installation of 3598 linear feet of wick drains, furnishing 1,100 cubic yards of gravel, potentially preboring, installation of 2,588 linear feet of stone columns (44 columns, 3-foot-diameter to depths of 52 and 67 ft) and site restoration. The Contractor shall use the bottom feed dry vibratory method for stone column installation but, as a backup, shall also mobilize and have the capability to install stone columns using the wet (vibroflot) method. Stone column installation shall include displacing and densifying the materials to be treated, and supplying gravel backfill material for the column to the bottom of the probe using a tremie system. Acquisition of these services will be accomplished using the Two-Step Sealed Bidding procedure. In the first step, offerers will submit technical proposals which include a technical plan for construction (specifically addressing bottom feed stone column and wick drain construction), descriptions of equipment, and experience for work such as that specified. The technical proposal shall not include prices or pricing information. In the second step, only bids based upon technical proposals determined to be acceptable, either initially or as a result of discussions, will be considered for award, and each bid in the second step must be based on the bidder's own technical proposal. Offeror's should submit proposals that are acceptable without additional explanation or information as the Government may make a final determination regarding a proposal's acceptability solely on the basis of the proposal as submitted and may proceed without requesting further information from any offeror; however, the Government may request additional information from offerors of proposals that it considers reasonably susceptible of being made acceptable, and may discuss proposals with their offerors. Multiple technical proposals may be submitted. A notice of unacceptability will be forwarded to unsuccessful offerors upon completion of the proposal evaluation and final determination of unacceptability. The anticipated period of performance for this work is mid-June to August 1997; however this period is not binding on the Government and the actual performance requirements will be detailed in step two. The request for proposal for step one of this requirement will be issued approximately April 11, 1997. All requests for the package with information regarding step one of this solicitation must be in writing, by FAX to (208) 378-5108 or via E-Mail to dlarrondo@pn.usbr.gov. Telephone inquiries will not be accepted. See numbered Note 26. (0085)

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