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Article VIII. Other Guidelines
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Potable water supply is to be extended to the station’s valve vault from the nearest existing water main. The station water service and piping shall be of sufficient size to provide a flow of not less than 40 gallons per minute through a hose and nozzle to be used in the wetwell for washdown purposes. The hose and nozzle, which will be furnished by the WSSC, will consist of a one-and-one-half-inch diameter rubber hose of a length sufficient to extend from the valve vault to the wetwell terminated with a plain, straight, tapered nozzle 10 inches long with a one-half-inch orifice. The station service pipe nominal diameter shall be two inches minimum with a shut-off valve at the street and shall be run at least four feet below grade.

A shut-off valve and a WSSC water meter with bypass in accordance with WSSC Chapter 14.25 shall be installed in the valve vault. Nonpotable water shall be extended to a freeze-proof type wall hydrant (three-quarter-inch) connected to the above-grade backflow preventer and to a one-and-one-half-inch hose bib. A hose rack shall be mounted next to the hose bib.

A water piping schematic is shown on Drawings DG-08-02 and DG-08-02A. Drainage from the backflow preventer shall be piped to the vault sump. (Design Guideline DG-08 § 7.0, dated August 2006)