Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1.
Scope.
The prohibitions in this part apply to every source of indirect
discharge whether or not it is subject to other pretreatment
requirements.
Subp. 2.
General prohibitions.
A source of indirect discharge shall not introduce any
pollutants that cause pass-through or interference.
Subp. 3.
Specific prohibitions.
In addition to the general prohibitions in subpart
2, the following pollutants
shall not be introduced into a POTW:
A. pollutants that create a fire or explosion
hazard in a POTW, including, but not limited to, waste streams with a closed
cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees centigrade
using the test methods specified in Code of Federal Regulations, title 40,
section
261.21;
B. pollutants that will cause corrosive
structural damage to a POTW, but in no case discharges with a pH lower than
5.0, unless the POTW plant is specifically designed to accommodate such
discharges;
C. solid or viscous
pollutants in amounts that will cause obstruction to the flow in a POTW plant
or POTW collection system resulting in interference;
D. any pollutant, including oxygen-demanding
pollutants such as biochemical oxygen demand, released in a discharge at a flow
rate or pollutant concentration that will cause interference or pass-through at
a POTW plant;
E. heat in amounts
that will inhibit biological activity in a POTW plant resulting in
interference, but in no case heat in such quantities that the temperature at
the headworks of the receiving POTW plant, excluding the POTW collection
system, exceeds 104 degrees Fahrenheit or 40 degrees centigrade unless the
agency, upon request of the POTW authority, approves alternate temperature
limits;
F. petroleum oil,
nonbiodegradable cutting oil, or products of mineral oil origin in amounts that
will cause interference or pass-through; or
G. pollutants that result in the presence of
toxic gases, vapors, or fumes within a POTW plant in a quantity that may cause
acute worker health and safety problems.
Subp. 4.
Discharge.
Wastes trucked or hauled to a POTW shall be discharged only at
a point designated by the POTW authority.
