{"id":"41d909e9-b959-414d-8f40-bcf1554e2536","task":"Distinguish NRMCA ready-mix plant certification from the contractor's own quality-control responsibilities on a concrete flatwork pour","domain":"qc-responsibilities","steps":["Recognize that NRMCA (National Ready Mixed Concrete Association) plant certification programs assess the producer's plant, equipment, and quality-management systems for consistently producing conforming concrete -- they do not certify or guarantee the placing contractor's finishing, jointing, curing, or flatness/levelness results.","Confirm the ready-mix supplier's plant certification and mix design documentation (batch tickets, approved mix design, delivery/discharge time records) as part of receiving-inspection QC, without treating plant certification as covering field placement quality.","Assign and document field QC responsibilities separately: slump/air/temperature testing at point of placement, cylinder/test specimen sampling, finishing-crew qualifications, curing application, and joint-sawing timing are the placing contractor's responsibility.","Use ACI flatwork craftsman certifications (Concrete Flatwork Associate/Finisher/Advanced Finisher) to document finishing-crew qualifications as part of the contractor's own QC program, distinct from the plant's NRMCA certification.","Set a clear QC chain of custody at the pre-slab conference describing what the producer certifies vs. what the contractor tests and documents, so a flatness, jointing, or curing dispute is not incorrectly attributed to bad concrete."],"gotchas":["An NRMCA-certified plant does not guarantee acceptable floor flatness, levelness, or finish quality -- those depend on field placement and finishing practices regardless of plant certification status.","Confirm which specific NRMCA certification program is being referenced (plant certification vs. individual technician/QC personnel programs), since NRMCA offers more than one type of certification covering different things."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/41d909e9-b959-414d-8f40-bcf1554e2536"}