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Driesenga & Associates, Inc. (D&A) is a full service professional engineering firm providing civil and geotechnical engineering, land surveying, land planning, construction materials testing and inspection, environmental consulting and landscape architecture. The professional services offered by D&A can be grouped into six (6) general categories: Civil Engineering, Land Surveying, Geotechnical Engineering, Construction Materials Testing, Environmental Consulting, and Landscape Architecture. In support of these areas, the firm is equipped with engineering laboratories to perform soil, concrete, masonry, and asphalt testing.