Driesenga & Associates, Inc. provides municipal agencies, project owners, architects, construction managers, and general contractors with independent on-site and laboratory testing of a wide range of construction materials. Driesenga & Associates, Inc. takes pride in being on-site as needed, and providing timely, concise, and accurate reports regarding field and laboratory material testing. The scope of our field inspection services includes on-site inspection of base material and sub-grade preparation; sampling and compaction testing of structural fill;

periodic sampling of materials to verify continued compliance with specifications; inspection of bituminous material; concrete and asphalt batch plant inspection; on-site determination of slump, air, temperature, and unit weight of cast-in-place concrete; reinforcing steel and structural steel inspection, and masonry inspection. Our construction inspection services are often provided in conjunction with, or as a follow-up to, our geotechnical and civil engineering services, thus enabling verification of many of the construction procedural recommendations contained in our plans and specifications.