A dosing tank shall be provided for a leaching
chamber and leaching field system where the volume of waste to be
disposed of is an excess of 2,000 gallons per day.
Dosing shall alternate when the total volume
of waste to be disposed of exceeds 5,000 gallons per day. Alternating
siphons and pumps shall discharge to separate disposal areas of equal
size.
Dosing tanks shall have the capacity to discharge
a volume adequate to cover the dosed leaching area to a depth of at
least one inch in not over 15 minutes.
Dosing tanks shall be constructed of concrete or other material as approved by the Department of Environmental Quality Engineering and shall conform to § 223-60 of this chapter and shall be cast without joints and shall be watertight if installed below groundwater level.
Dosing tanks shall be constructed on a level,
stable base that will not settle.
Dosing tanks shall be constructed in a manner
that will permit venting through the building sewer or other suitable
outlet.
The invert elevation of the inlet shall be at
least one foot above maximum groundwater elevation, and the tank shall
be waterproof and watertight.
To provide access and to facilitate repair or
adjustment of the siphons or pumps, dosing tanks should be provided
with manholes at least 24 inches in diameter, with metal frames and
covers to grade over each pump or siphon.
Annual inspections are recommended to determine
if the pumps or siphons are in working order.
