- (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