310 CMR, § 15.252 - Beds or Fields
(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.
Notes
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