Robert A. Bothman Construction has been offering clients top quality, design build and construction management services for o ... ver 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. read more