1, provides NAVFACENGCOM criteria for designing, specifying, inspecting, and accepting plumbing systems for various naval shore facilities.

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MIL-HDBK-1003/1

APPENDIX H (Continued)

The floor drain must accommodate the full flow of the ES/EWS to avoid spilling water over the containment curb, into the hazardous material storage area, and to avoid damage to the material and the facility in case of continuous ES/EWS operation.

2) Floor drains should be provided with 4 inch deep seal traps. Frequent testing of the ES/EWS, as required by ANSI Z 358.1, will refill the trap seal.

The deep seal trap is provided to reduce the problem of the unused trap drying out and allowing the back flow

of sewer gases, fumes, and vermin into the space. Weekly testing of the ES/EWS will be usage enough to refill the trap seal; otherwise, provide an automatic trap priming valve connected to the cold water supply to maintain the trap seal.

3) Provide a 1.5 inch high ES/EWS containment curb completely around the ES/EWS, slope the exterior (approach) face of the curb up at a slope of 1 inch rise in 12 inches horizontal, but not more than 1 inch rise in 8 inches per Uniform Federal Accessibility Standards (UFAS) 4.1.6, mark the ES/EWS curb as a trip hazard per OSHA regulations, and inform the personnel that the ES/EWS curb exists. Where ES/EWS with floor drains are located within hazardous material (hazmat) spill containment bermed or curbed areas, provide the crest of the ES/EWS curb to be 1.5 inches higher than the surrounding hazmat area curb, to ensure spills do not enter the floor drain. See the attached sketch.

The ES/EWS containment curb protects the floor drain from accidental spills in the surrounding hazmat area. The ES/EWS curb also protects the stored hazmat materials and facility from accumulated ES/EWS water flow by directing the flow into the floor drain.

4) Post a placard at each ES/EWS stating: "NO DUMPING. This drain discharges untreated into the sanitary sewer, contact Activity Environmental Office for proper disposal of spilled material or waste."