Minn. R. Part 7080.1960 - SEPTIC TANK BAFFLES
All septic tanks must be baffled according to items A to G. Effluent screens are allowed to be substituted for outlet baffles.
A. Baffles must be installed at each inlet
and outlet of septic tanks. Outlet baffles are required on compartment walls if
the transfer hole is at the liquid level.
B. Baffles must be resistant to corrosion or
decay. Inlet baffles must not restrict the movement of solids.
C. Baffles must be integrally cast with the
tank or affixed at the top and bottom with connectors that are not subject to
corrosion or decay. Baffles for fiberglass-reinforced polyester tanks are
allowed to be either resin bonded or secured with suitable structural adhesive.
Sanitary tees used as baffles must be affixed to the inlet or outlet pipes with
a permanent waterproof adhesive.
D.
The inlet baffle must extend at least six inches, but not more than 20 percent
of the total liquid depth, below the liquid surface. The inlet baffle must
extend above the liquid surface in compliance with part
7080.1920, item E, and at least
one inch above the crown of the inlet sewer.
E. The outlet baffle and any baffles between
compartments must extend below the liquid surface a distance equal to 40
percent of the liquid depth, except that the penetration of the indicated
baffles or sanitary tees for horizontal cylindrical tanks must be 35 percent of
the total liquid depth. They must also extend above the liquid surface as
determined in part
7080.1920, item E.
F. There must be at least one inch between
the underside of the top of the tank and the highest point of the inlet and
outlet baffles.
G. The nearest
point on the inlet baffles other than sanitary tees must be no less than six
inches and no more than 12 inches from the end of the inlet pipe. The nearest
point on the outlet baffle, other than sanitary tees, must not be closer than
six inches and no more than 12 inches from the beginning of the outlet pipe to
the baffle. Sanitary tees used as inlet or outlet baffles must be at least four
inches in diameter.
Notes
Statutory Authority: MS s 115.03; 115.55
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