Donald Keef & Associates Inc

Stimpel-Wiebelhaus Associates (SWA) is a general engineering contractor based in Redding, California, founded in 1969. Specializing in a wide range of construction services, including dam construction, mass excavation, and roller-compacted concrete, SWA focuses on delivering projects on time and within budget, emphasizing collaboration with owners and engineers. Generated from the website

ArcSine, formerly known as Electrical and Control System Engineering, offers a range of lighting design services. Founded in 1978, it serves schools, offices, retail stores, and medical and historic facilities. The company provides a variety of mechanical engineering solutions for clean rooms, piping and plumbing systems, and industrial waste collection and treatment plants. ArcSine offers engineering services for municipal, industrial and recreational facilities. It also provides civil, structural, geotechnical, landscape and architectural engineering solutions. The company offers programming and control system engineering services. ArcSine has completed projects for Sacramento Regional Wastewater Treatment Plant. The company maintains a staff of more than 25 employees.