A user may not introduce into a POTW any pollutant(s) which cause pass through or interference. These general prohibitions and the specific prohibitions in divisions (A) through (N) of this section apply to each user introducing pollutants into the POTW whether or not the user is subject to other national pretreatment standards or any national, state or local pretreatment standards or requirements. In addition, no user shall discharge or cause to be discharged any of the following described substances into the POTW:
(A) Heat in amounts which will inhibit biological activity in the POTW resulting in interference, but in no case heat in such quantities that the temperature at the POTW treatment plant exceeds 104°F (40°C);
(B) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure or any other solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in interference;
(C) Any pollutants, such as gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas which creates a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140°F (60°C) using the test methods specified in 40 C.F.R. § 261.21;
(D) Pollutants which will cause corrosive structural damage to the POTW, but in no case discharges with a pH lower than 7.0 in accordance with 40 C.F.R. § 403.5;
(E) Any waters or wastes containing toxic or poisonous substances or resulting in the presence of toxic gases, vapors or fumes within the POTW in a quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or create any hazard in the receiving waters of the treatment plant;
(F) Any noxious or malodorous liquids, gases, solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;
(G) Any pollutants, including oxygen demanding pollutants, (BOD, etc.) released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
(H) Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts which will cause interference or pass through;
(I) Any trucked or hauled pollutants, except at discharge points designated by the city;
(J) Any radioactive wastes. In the event of an accidental spill of radioactive material into any public sewer, the person responsible shall:
(1) Immediately notify the General Manager; and
(2) Render such technical or other assistance to the city within its power to prevent the POTW from becoming contaminated with radioactivity.
(K) Any dispersed biodegradable oils and fats, such as lard, tallow or vegetable oil in amounts that will cause interference or pass through in the POTW;
(L) Wastewater causing two readings on an explosion hazard meter at the point of discharge into, or at any point in, the city’s public sewer of more than 10% or any single reading over 5% of the lower explosive limit of the meter;
(M) Medical wastes, except as specifically authorized by the city in a wastewater discharge permit; and
(N) Sludges, membrane retentates, spent chemical solutions or other wastes generated during the reclamation, recycling, purification, or recovery of water, chemical solutions, brines or other industrial process flow streams, except for reclamation of clean-in-place solutions for recycling. Upon approval by the General Manager, substances prohibited by this division may be allowed if the user’s wastewater discharge is within full compliance with the requirements of this chapter, and the substances will not cause a violation of this chapter. The allowance will be specified in the user’s wastewater discharge permit. The General Manager may deny acceptance of these discharges at any time.
(1995 Code, § 7.20.460) (Ord. 17-03, passed 3-21-2017; Ord. 15-02, passed 5-5-2015)