Section 444.8378 - Stepped network of trenches utilizing relief lines: Design criteria1. The size of the required absorption area for a stepped network of trenches utilizing relief lines must be calculated based on percolation testing and must conform to the requirements for the sizing of a standard trench. Percolation testing must be conducted at the location of each stepped trench and the size of the required absorption area must be calculated based on the slowest percolation rate.2. The invert of the overflow section must be located not less than 1 inch or more than 2 inches above the top of the disposal trench distribution line. The leaching aggregate must extend at least 4 inches above the disposal distribution line, as shown in subsection 5.3. To minimize the possibility that the slope will fail or that effluent will surface down slope, the design of the disposal field must comply with the slope requirements set forth in NAC 444.794.4. Trenches for a stepped network of trenches utilizing relief lines must be spaced at least 10 feet apart.Nev. Admin. Code § 444.8378
Added to NAC by Bd. of Health by R129-98, eff. 3-25-99