I have 25 years of experience, and specialize in the field of geotechnical engineering and construction services with specific knowledge in the areas of subsurface investigations, construction observations and materials testing services. I have published on such topics as the affect of vegetation on the affect of the shear strength of soils on slopes. I have testified on a contractors ability to obtain additional payment for obstructions encountered during the installation of a slurry wall, a contractors ability to get paid because of an inadequate report prepared for a construciton site (changed conditions) and a city having responsibility for damages caused by a slope failure along a river bank.