GES Construction Co. Bolman Sedimentation Basin

The Contra Costa Water District’s Ralph D. Bollman Water Treatment Plant (Bollman WTP) was constructed in 1968 and is located in Concord, California. The Bollman WTP supplies clean and sanitary water to the general public for drinking and other purposes. The recent plant upgrade of $35 million will allow Contra Costa’s 430,000 customers to continue …

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