Beds or Fields
Effective Aug 4, 2023Mass. Register #1501MGL c. 21A, § 13Massachusetts Department of Environmental Protection
- (1) The use of leaching beds or fields is restricted to systems with a calculated design flow of less than 5,000 gpd per leaching bed or field.
(2) Bed or field specifications:
- (a) Minimum number of distribution lines = 2.
- (b) Length - 100 feet maximum.
- (c) Slope of distribution lines - 0.005 feet per foot.
- (d) Separation distance between lines - six feet maximum.
- (e) Lateral separation distance between lines and edge of the bed - four feet maximum.
- (f) Separation distance between adjacent beds/fields - ten feet.
- (g) Aggregate depth (below the invert of the distribution lines) - six inches minimum, 12 inches maximum.
- (h) Distribution lines - refer to 310 CMR 15.251(5) through (10) (Trenches).
- (i) Effective leaching area - shall include only the bottom area, not the sidewalls.