Section 11-62-31.2 - Site evaluation(a) The site evaluation shall be performed by the engineer.(b) The site shall be evaluated for depth of permeable soil over seasonal high groundwater, bedrock, or other limiting layer, soil factors, land slope, flooding hazard, and amount of suitable area available.(c) The minimum depth of the soil profile observation shall be at least five feet. If the engineer performs a preliminary observation at three feet, the engineer shall confirm the soil profile to five feet at the time of construction.(d) The following factors shall be evaluated and reported for a depth of at least three feet below the proposed absorption system:(1) Thickness of layers or horizons;(2) Texture of soil layers;(3) General color, and color variation (mottling);(4) Depth to water, if observed;(5) Depth to estimated seasonal high groundwater table;(6) Depth to and type of bedrock, if observed; and(7) Other prominent features such as structure, stoniness, and roots.(e) Percolation tests. (1) Soil percolation tests shall be conducted at a minimum depth of three feet. If at the time of construction, the soil profile at five feet is different than at three feet, another percolation test shall be performed at the depth of the bottom of the absorption system;(2) Percolation tests shall follow the falling head test procedure in Appendix C, entitled Falling Head Test Procedure, dated July 1, 2014, located at the end of this chapter; and(3) Additional percolation tests may be required to identify the existence of a limiting layer.(f) The site evaluation information shall be reported on forms developed by the director.(g) If, during construction the actual site conditions differ from the site conditions upon which the wastewater system was approved, the design engineer shall revise the wastewater plans to reflect the actual site conditions. The plans of the revised wastewater system shall be submitted to the director for approval pursuant to section 11-62-31.1(f). Haw. Code R. § 11-62-31.2
[Eff 8/30/91, am and comp 12/09/2004] (Auth: HRS §§ 321-11, 342D-4, 342D-5) (Imp: HRS §§ 321-11, 322-1 to 322-4, 322-8, 342D-2, 342D-4, 342D-5, 342D-50)