Al holds a B.S. in Civil Engineering from the University of Colorado and holds four patents in the area of rock and soil slope stabilization methods and innovations in soil nailing. Al worked at the Colorado Department of Highways from 1963 to 1982 in the area of materials engineering and geotechnical engineering. During this time he was involved in highway designs including slope stability, highway stability, structural inspections and material designs. Research performed during this time included soil collapse potential, swelling of bedded shales and clays, and soil reinforcement. Included in this work was the design and construction supervision of the Glenwood Canyon fabric walls with instrumentation for determining strain and deformation of the full height test walls.
In 1982 he began work for Corn Construction Company as the Materials and Quality Control Engineer. In this position he was responsible for locating and obtaining materials for highway construction projects in five western states. In 1986 he took over the materials laboratory of Sergent, Hauskins & Beckwith Consulting Engineers in Phoenix. In this position he was responsible for the instrumentation of structural foundation elements, including the installation and operation of load cells, inclinometers, strain gauges, piezometers, and supervision, training and operation of the 1000 ton load test frame. Among his projects was the design of fabric reinforced soil walls.
In 1994 Al returned to Denver to consult independently for soil nail shoring and reinforced soil design and construction in Colorado. He designed and supervised construction of geosynthetic confined soil® walls as great as 93 feet in height. He designed and supervised construction of ground anchored and soil nail walls up to 110 feet in height. After consulting for Yenter Companies for several years, he joined Yenter as Chief Engineer and later became President of the company.
Al has design responsibility for hundreds of reinforced soil structures throughout the U. S. and internationally, valued at well over a 300 million dollars, and over 100 soil nail walls and landslide stabilization repairs using soil nails totaling over 100,000 square feet. He is one of the top geotechnical and structural researchers, innovators, designers and constructors in the world, and currently lives in Palisade, Colorado.
A variation of karst sinkhole grouting is the grouting of mined coal seams and workings located below existing infrastructure that exhibit the potential to propagate to the surface and cause sinkholes and/or subsidence.