Preferred: ACI Field Testing Grade I and/or Strength Testing certification; mix-design experience; New England DOT specifications; familiarity with ASTM C31, C39, C138, C143, C173/C231, C1064; durability testing (resistivity, permeability); associate's/bachelor's in civil engineering technology or related field. QC Technician materials and fresh concrete testing, strength testing, documentation Senior QC Technician mix-design trials, durability testing, data analysis, mentoring QC Specialist mix-design development, nonconformance investigations, spec review, R&D.