Dewatering Crews Keep the Alameda Corridor Dry and Open for Business

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Courtesy of Griffin Dewatering

Griffin installed a multitude of deep wells along the alignment of the proposed railway to allow for construction. The discharge from the wells was pumped via large diameter high density polyethylene pipe (HDPE) to a below grade mixing vault, where a neutralizing agent was introduced to the groundwater as the quality of the groundwater was not allowed to discharge to the designated receiving area without this treatment.

The mixing vault consisted of a below grade concrete sump into which the groundwater was pumped from the dewatering wells. A metering pump dispensed the neutralizing agent into the effluent based on incoming flows. Installed into the vault were three 12-in. hydraulic-driven submersible pumps (Griffin Model 12T with 825 Power Units). These pumps would then pump the treated groundwater to a receiving point approximately one mile away.

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