14 CAR § 21-602. Soil separation distances

(a) The following are minimum separation distances from the bottom of the proposed absorption trench to the true water table (aquifer) and bedrock. (b)(1) These conditions shall be met before the soil is considered suitable for subsurface renovation. (2) True water tables. Minimum hydraulic conductivity in depth zone extending six inches (6”) above and twelve inches (12”) below planned depth to base of soil absorption trench: Low or Moderate Hydraulic Conductivity 24 inches High Hydraulic Conductivity 36 inches (3) Bedrock. Minimum hydraulic conductivity in depth zone extending six inches (6”) above and twelve inches (12”) below planned depth to base of soil absorption trench: Low or Moderate Hydraulic Conductivity with redoximorphic features indicating SWT of moderate duration or longer. 18 inches Low or Moderate Hydraulic Conductivity with no redoximorphic features or redoximorphic features indicating a brief SWT. 24 inches High Hydraulic Conductivity 36 inches