Arivaca Abandoned Mine Lands Safety Closures

This solicitation, numbered 127EAV26Q0068, is a combined synopsis and request for quotation issued under FAR Part 12 for the remediation of 60 abandoned mine features located within the Nogales Ranger District of the Coronado National Forest in Santa Cruz County, Arizona. The work requires the physical closure of mine shafts, adits, and tunnels using earthen backfill and/or polyurethane foam, installation of bat-friendly closures such as grates and cupolas, fencing, removal of debris and abandoned equipment, and revegetation of disturbed areas. All work must adhere to specific technical standards including the use of Type II Portland cement, two-foot diameter riprap, six-inch SDR-35 or schedule 40 PVC, ABS, or HDPE drainpipe, and compliance with the National Historic Preservation Act of 1966. Concrete closures must be excavated to competent bedrock with a minimum two-foot ledge width and constructed using corrugated metal stay-in-place forms and steel or wood beams. Quality control requires concrete sampling in accordance with ASTM C-31 and C-172, with four cylinder samples per batch tested at seven, twenty-eight, and fifty-six days per ASTM C-39, with costs borne by the contractor and subject to the Contracting Officer’s Representative’s concurrence. Technical compliance is rigorously evaluated through a pass/fail gate system requiring evidence of schedule adherence, qualified personnel resumes, and demonstrable experience with similar work, alongside complete pricing for all 80 line items in the provided Excel schedule. The contract is a Firm-Fixed Price award, with delivery and performance required between September 28, 2026, and February 26, 2027, and deliverables include two electronic copies of a bound technical report, two electronic project documentation files, and digital color photographs. The acquisition is a Total Small Business Set-Aside under NAICS code 562910 with a small business size standard of 1,000 employees, and all responsible small businesses are eligible to respond. Offers must be submitted by 9:00 AM Pacific Time on July 27, 2026, and must include a completed and signed SF-1449, an unconverted Excel Schedule of Items, a 20-page Technical Approach, and a 10-page Past Performance volume. Pricing must be provided in the original Excel format and