§ 12.16.530 — Prohibited discharges

Sec. 12.16.530. - Prohibited discharges.

(a) General prohibitions. An industrial user may not introduce into a POTW any pollutant(s) which cause pass through or interference. These general prohibitions and the specific prohibitions in paragraph (b) of this section apply to each industrial user introducing pollutants into a POTW whether or not the industrial user is subject to other pretreatment standards or requirements. (b) Specific prohibitions. The following pollutants and pollutant properties are specifically prohibited to be discharged to the POTW by an industrial user: (1) Stormwater drainage from ground resulting in infiltration and inflow (I&I) through the industrial user's service line(s) or surface, roof drains, catch basins, unroofed area drains (e.g. commercial car washing facilities) or any other source unless otherwise approved by the director and the user applies for and obtains a permit for discharge from the city. Specifically prohibited is the connection of roof downspouts, exterior foundation drains, areaway drains, or other sources of surface runoff or ground water to a building sewer or building drain which in turn is connected directly or indirectly to the city's wastewater collection system. No person shall connect or discharge water from underground drains, sump pump discharges, natural springs and seeps, water accumulated in excavation or grading or any other water associated with construction activities. (2) Pollutants which create a fire or explosion hazard in the POTW, including, but not limited to, wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit (140°F) or 60 degrees Celsius (60°C) using the test methods specified in 40 CFR Section 261.21. The director may require industrial users with the potential to discharge flammable, combustible or explosive substances to install and maintain an approved combustible gas detection meter or explosion hazard meter. No two successive readings on an explosion hazard meter at the point of discharge shall be more than five percent or any one reading more than ten percent, of the lower explosive limit (LEL) of the meter. (3) Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems. (4) Pollutants which will cause corrosive structural damage to the POTW, but in no case discharges with pH lower than 5.5 or greater than 10.5. (5) Any solid or viscous pollutants wastes that may cause obstruction or reduction of flow in the POTW resulting in interference. These objectionable substances include, but are not limited to asphalt, dead animals, offal, ashes, sand, mud, straw, industrial process shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, bones, hair, fleshings, entrails, paper dishes, paper cups, milk containers, or other similar paper products, either whole or ground. (6) Any petroleum oil, non-biodegradable cutting oil, or products of and mineral origin in amounts that will cause pass through or interference. The city may include sampling and reporting requirements in a permit or require compliance with permit specific limits or best management practices where the concentration has the reasonable potential to exceed 100 mg/L. (7) Any radioactive, radiological, chemical or biological warfare agent waste or material discharged in violation of a state or federal standard or otherwise causes pass through or interference. (8) Any pollutant, including oxygen-demand pollutants, released in a discharge at a flow rate and/or pollutant concentration which will cause interference at the POTW. (9) Any 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 exceeds 40 degrees Celsius (40°C) or 104 degrees Fahrenheit (104°F) at the treatment plant. (10) Any water or waste containing free or floating oil and grease, or any discharge containing animal fat or grease by-product in excess of 300 milligrams per liter (300 mg/L). Removing wastes collected in a grease trap, grease interceptor, waste collection tank or other treatment device and reintroducing any portion of the wastes back into the wastewater collection system either directly or indirectly is prohibited except as authorized in a permit issued by the city. (11) Any pollutant which may cause the POTW's effluent, sludge, or residue to be unsuitable for, or interfere with, the reclamation or reuse process. (12) Any pollutant which will cause the POTW to violate its NPDES permit and/or the receiving water quality standards. (13) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions. (14) Any pesticides, herbicides or fungicides that cause or contribute to pass through, interference or other problems at the treatment works or in the receiving waters. In no case, shall an industrial user discharge wastewater that is generated from the rinsing of any container that contains or contained any concentrated or formulated pesticide, herbicide or fungicide. (15) Any discharge of geothermal water, that being water heated naturally by the earth and all dissolved or entrained minerals contained therein, from any commercial, industrial, or residential source. (16) Any trucked or hauled pollutants, except at discharge points designated by the city. (17) A slug discharge as defined in section 12.16.720. (18) Liquid wastes from chemical toilets, and trailers, campers or other recreational vehicles which have been collected and/or held in tanks or other containers shall not be discharged into the POTW except at locations authorized by the city to collect such wastes. (19) No chemicals, materials, or substances, including but not limited to, paints, solvents, boiler or water treatment chemicals, sludges, chemicals, or wastes shall be stored in proximity to a floor drain or other sewer openings. Containers shall be clearly labeled and stored in a place where the chemicals, materials, substances or wastes, in case of leakage or rupture of the container, cannot enter the wastewater collection system. The storage of any chemicals, materials, substances or wastes that leak or have potential to leak or discharge into the wastewater collection system which may create an explosion hazard or in any way have a deleterious effect to the POTW or constitute a nuisance or a hazard to POTW personnel, the general public, the environment, or the receiving stream shall be prohibited. (20) Any water contaminated as a result of discharge from aboveground and/or underground gasoline, diesel fuels, fuel oil, kerosene, and jet fuel tanks, tank accessories, and/or pipelines without applying for and obtaining a permit prior to discharge unless the director has approved such discharge in writing. (21) Any wastes containing detergents, surface-active agents, or other substances in concentrations which cause excessive foaming in the POTW or cause or contribute to interference or pass through. (22) Any pollutant or wastewater containing pollutants with UV (254 nm) absorbing substances which causes interference with UV disinfection at the treatment plant. (23) Wastes that have been collected and/or held in a tank or other container and where such wastes fail to comply with any pretreatment standard.

(Ord. No. 6305, § 1, 8-28-13)