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In an effort to prevent wastewater overflows and backups caused by power outages, all wastewater pumping stations are required to have standby power, which will consist of a reliable second feed from the power company or an on-site standby generator.

For dual feeders from the power company, the following criteria shall apply. The EPA design criteria calls for the two feeders to be fed from two separate substations. However, this is often impractical and very costly, especially for small pumping stations. Therefore, if the power company’s substation is fed from more than one source with the incoming feeders following separate routes, two feeders to the pumping station from nonadjacent bays at the power company’s substation are acceptable. The two feeders shall follow separate routes so that chances of simultaneous disruption of power will be minimized.

The feasibility, reliability and the cost of a second feed shall be carefully evaluated and compared to the cost of on-site generation and the better alternative shall be chosen with the concurrence of the WSSC. The consultant shall perform and submit to the WSSC for approval a present worth analysis which compares a dual feed power distribution arrangement to the option of single feed power distribution with a standby generator. (Design Guideline DG-08 § 13.2, dated August 2006)