Robert A. Bothman Construction has been offering clients top quality, design build and construction management services for over 40 years. We are one of Northern California and the Hawaiian Islands top general building and engineering contractors, specializing in athletic facility construction, infrastructure, parks & recreation site work, landscaping, and all aspects of concrete construction.Also known as RAB, we are a certified pervious concrete distributor and installer and a sole distributor of the patented RABcrete™, a revolutionary mix design created by our own research and development team.