Sampling and testing of soils, aggregate, concrete, asphalt cement, hot-mix asphalt, emulsified asphalt, mortar, masonry units, concrete pavers, bricks, concrete beams, and silo staves Compaction (field density) testing using nuclear density test gauges or sand cone methods Moisture-density test curves, modified and standard Proctor methods California Bearing Ratio (CBR) Soils laboratory testing methods include: California Bearing Ratio, Atterberg limits, moisture content, organic content by loss on ignition, particle size distribution using hydrometer and sieve analyses, rate of consolidation, compacted permeability rates, falling head permeability rates, constant head permeability rates Torque testing of bolted connections Weld observations and testing AASHTO-certified laboratory WisDOT-approved laboratory QMP testing of WisDOT projects for concrete and aggregate base course materials Field and laboratory technicians certified through the Highway Technician Certification Program for testing concrete, asphalt, and aggregate Double-ring infiltrometer testing (for in-situ rate of permeability) Slug testing of monitoring wells and piezometers (for in-situ rate of permeability)