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1. The following requirements shall apply to all users of the POTW:
A. All users shall promptly notify the WRA Director in advance of any substantial change in the volume or character of pollutants in their discharge.
B. New or increased contributions of pollutants or changes in the nature of pollutant discharged to the POTW shall require prior approval by the WRA Director.
C. Industrial users shall notify the WRA Director, the Environmental Protection Agency Regional Waste Management Division Director, and state hazardous waste authorities in writing of any discharge into the POTW of a substance which, if otherwise disposed of, would be a hazardous waste under 40 CFR 261. The notification shall comply with the requirements set forth in 40 CFR 403.12(p).
D. Discharge of any pollutants without the notice and approval required by this section is prohibited. Upon the receipt of notice required by this section, the WRA Director shall within 180 days or less approve the discharge if he or she finds the proposed discharge meets applicable pretreatment standards and requirements and would not cause the WRA to violate its National Pollutant Discharge Elimination System permit. The WRA Director shall deny permission for the discharge if he or she finds applicable pretreatment standards and requirements are not met or the discharge would cause a violation of the National Pollutant Discharge Elimination System permit for the WRF.
In lieu of denial of permission for discharge, the WRA Director may allow such discharge or contribution upon conditions which would not violate applicable pretreatment standards or requirements and would not cause a violation of the National Pollutant Discharge Elimination System permit for the WRF.
E. Food service establishments shall be regulated first under Division 5 of this ordinance but may be required to obtain a wastewater discharge permit and be subject to the requirements of Divisions 1-4 if the WRA Director determines that additional pretreatment is required in order to comply with fat, oil, & grease discharge limits.
2. Any part of this section notwithstanding, upon receipt of the notice required by this section, the WRA Director may require, in addition to the requirements of this section, that an industrial user obtain a permit under this chapter.
3. Users who are determined to be industrial users as herein defined and who refuse to apply for or obtain a wastewater discharge permit shall be subject to termination of sewer services as provided in Section 100.47 hereof.
The following general prohibitions shall apply to all users of the POTW unless the user is subject to a more restrictive National Categorical Pretreatment Standards, the Iowa Department of Natural Resources, or wastewater discharge permit limit. The following substances are prohibited from discharge to the POTW:
1. Pollutants creating a fire or explosion hazard in the POTW, including but not limited to waste streams with a closed cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using test methods referenced in 40 CFR 261.21. Waste streams shall not be ignitable at ambient temperatures. At no time shall two successive readings on a meter capable of reading L.E.L. (lower explosive limit) at the nearest accessible point to the POTW, at the point of discharge into the POTW or at any point in the POTW, be more than five percent nor any single reading greater than ten percent.
2. Any substance which will cause corrosive structural damage to the POTW, but in no case discharges with pH lower than 5.0 or greater than 12.0.
3. Solid or viscous pollutants which will cause obstruction to the flow in the POTW resulting in interference. Such pollutants include but are not limited to grease, garbage with particles greater than one-half inch any dimension, animal tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, wipes, spent grains, spent hops, wastepaper, wood, plastics, tar, asphalt residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing waste, or tumbling and de-burring stones, and wastewater containing fat, wax, O&G, or other substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit (0 and 65 degrees Celsius).
4. Any pollutant, including oxygen demanding pollutants (BOD, etc.) released in a discharge at a flow rate or pollutant concentration which will cause interference or pass through at the WRF or which constitutes a slug load as defined in this chapter.
5. Heat in amounts which will inhibit biological activity in the POTW resulting in interference, but in no case wastewater or vapor having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius) at the point of introduction into the POTW, and in no case wastewater or vapor which alone or in concert with other discharges produces a temperature at the WRF greater than 104 degrees Fahrenheit (40 degrees Celsius).
6. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through.
7. 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 or a public nuisance.
8. Any trucked or hauled pollutants, except at discharge points designated by the WRA.
9. Any radioactive material as defined in the Atomic Energy Act of 1954, as amended, and as defined in I.C. §136C.1, except materials which meet conditions of disposal by release into sanitary sewerage pursuant to 10 CFR 20.2003.
(Subsection 9 – Ord. 22-07 – Oct. 22 Supp.)
10. Any wastewater containing concentrations of inert suspended solids, such as but not limited to fuller's earth, lime slurries, and lime residues, or of dissolved solids, such as but not limited to, sodium chloride and sodium sulfate, which exceed 3,000 mg/l nonvolatile or 3,000 mg/l total dissolved solids unless approved by the WRA Director.
11. Pollutants causing excessive discoloration, such as but not limited to dye waste and vegetable tanning solutions.
12. Hazardous waste pharmaceuticals for human or animal use as defined in 40 CFR 266.500.
(Subsection 12 – Ord. 22-07 – Oct. 22 Supp.)
1. Generally. Local limits for specific pollutants discharged pursuant to this chapter shall be as follows:
A. Dilution. Dilution of the discharge from a pretreatment facility or from a regulated process is prohibited as a method for treatment of wastes in order to meet the limits set forth in this chapter.
B. Sample location. Measurement of pollutant concentrations to determine compliance shall be made at the point immediately following the pretreatment facility and before mixture with other waters, unless another point is designated by the WRA Director. If necessary, the concentrations so measured shall be recomputed to exclude the effect of any dilution that is improper using the combined waste stream formula.
2. Headworks limits; average mass. The average composite loading of all industrial users contributing the following specific pollutants to the POTW shall not exceed the allowable total pounds. The allocation of pollutants between industrial and nonindustrial sources may be adjusted by the director provided that the allowable total loading for any pollutant at the headworks of the WRF is not exceeded.
30-Day Average Allowable Pounds/Day | ||
Pollutant | Total | Industrial |
BOD | 195,600 | 135,153 |
TSS | 300,400 | 208,463 |
NH3 | 13,000 | 6,959 |
TKN | 27,760 | 16,950 |
Maximum Allowable Headworks Loading Pounds/Day
| Maximum Allowable Industrial Loading Pounds/Day |
Maximum Allowable Headworks Loading Pounds/Day
| Maximum Allowable Industrial Loading Pounds/Day | |
Pollutant | Total | Industrial |
Arsenic-T | 7.58 | 3.81 |
Cadmium-T | 3.65 | 2.16 |
Chromium-T | 136.35 | 120.90 |
Copper-T | 148.56 | 125.51 |
Cyanide-T | 17.08 | 8.28 |
Lead-T | 28.17 | 20.94 |
Mercury-T | 0.999 | 0.747 |
Nickel-T | 87.27 | 75.75 |
Silver-T | 23.30 | 19.77 |
Zinc-T | 360.59 | 283.53 |
3. Discharge concentration limits and review criteria. Discharge concentration limits and review criteria shall be as follows:
A. The discharge into the POTW of any materials, water or waste having a pollutant concentration greater than the limits in Subsections (3)(C), (D), and (E) of this section or containing pollutants not listed in this subsection shall be subject to the review and approval of the WRA Director. After review of the proposed discharges, the WRA Director may:
(2) Require pretreatment to an acceptable pollutant concentration for discharge to the POTW.
(3) Require control of the quantities and rates of discharge of the water or waste.
(4) Require payment to cover the added cost of handling and treatment of water and waste or any combination thereof.
(5) Reduce the maximum or average mass loading of present and prospective individual users on any reasonable prorated basis to meet headworks loading limits at the WRF.
(6) Require the user to obtain a wastewater discharge permit and be subject to any of the rules and regulations contained therein.
(7) Require the user to meet local limits when local limits are more restrictive than National Categorical Pretreatment Standards, provided that headworks loading limits are met.
(8) Initiate enforcement action in response to any noncompliance with this chapter using the enforcement procedures outlined in this chapter.
(9) Take any combination of the steps in Subsections 3(A)(1) through 3(A)(7), as appropriate.
B. Users discharging wastewater to the POTW whose pollutant concentrations or flows are greater than the following shall be considered industrial users for purposes of sewer charges and may be regulated or permitted by the WRA Director as appropriate:
Pollutant | Daily Maximum (mg/l) |
Pollutant | Daily Maximum (mg/l) | |
a. | BOD | 200 |
b. | TSS | 250 |
c. | COD | 300 |
d. | O&G-T | 100 |
e. | TKN | 30 |
f. | NH3-N | 15 |
g. | An average daily flow greater than 5,000 gallons or having an unusual concentration of flow. | |
C. Pollutant limits. Average and maximum concentration limits for users without National Categorical Pretreatment Standards for these pollutants shall be as follows:
Pollutant | Daily Maximum (mg/l) | Monthly Average (mg/l) |
Pollutant | Daily Maximum (mg/l) | Monthly Average (mg/l) |
Arsenic-T | 0.38 | 0.25 |
Cadmium-T | 0.08 | 0.05 |
Chromium-T | 6.43 | 4.29 |
Copper-T | 10.21 | 6.80 |
Cyanide-T | 0.53 | 0.36 |
Lead-T | 1.43 | 0.95 |
Mercury-T | 0.042 | 0.028 |
Nickel-T | 7.22 | 4.81 |
O&G-T | 400.0 | -- |
O&G-Mineral | 100.0 | -- |
Silver-T | 1.30 | 0.87 |
VPH | 10.0 | -- |
Zinc-T | 19.64 | 13.09 |
pH range shall be not lower than 5.0 or greater than 12.0.
Temperatures (liquids or vapors) shall be not greater than 150 degrees Fahrenheit at the point of entry into the POTW.
D. Daily maximum pollutant limits for hauled waste. Wastes delivered to the WRF by truck or rail shall not exceed the following concentrations in any load or overall daily loading limits unless otherwise approved by the WRA Director:
Pollutant | Concentration (mg/l) | Loading (pounds/day) |
Pollutant | Concentration (mg/l) | Loading (pounds/day) |
COD | 100,000 | -- |
O&G-T | 50,000 | -- |
VPH | 10.0 | -- |
Arsenic-T | -- | 0.014 |
Cadmium-T | -- | 0.93 |
Chromium-T | -- | 24.74 |
Copper-T | -- | 23.71 |
Cyanide-T | -- | 0.29 |
Lead-T | -- | 6.70 |
Mercury-T | -- | 0.12 |
Nickel-T | -- | 3.71 |
Silver-T | -- | 0.26 |
Zinc-T | -- | 87.62 |
pH range shall be not lower than 5.0 or greater than 12.0.
E. Daily maximum limit for gasoline cleanup projects. Discharge of wastewater from sites where gasoline is being removed from the soil or groundwater shall meet the following limits prior to discharge to the POTW:
Pollutant | mg/l |
Benzene | 0.050 |
BETX | 0.750 |
4. No subsection of this section shall be construed to provide lesser discharge standards than are or that may be imposed and required by U.S. Environmental Protection Agency or the Iowa Department of Natural Resources, nor to allow the average allowable total loading for any pollutant at the headworks of the WRF to be exceeded.
Users subject to National Categorical Pretreatment Standards (NCPS) as contained in 40 CFR I, Subchapter N, Part 405-471 shall comply with the standards and applicable reporting requirements under 40 CFR 403.12. New sources of categorical discharge shall meet National Categorical Pretreatment Standards in the shortest feasible time, but in no case longer than 90 days from the commencement of discharge. Failure to comply shall be a violation of this chapter and subject the user to enforcement action. The WRA is required to notify all known affected categorical users of the applicable reporting requirements under 40 CFR 403.12. Failure of the WRA to notify a user shall not relieve the user of the duty, if any, to comply with National Categorical Pretreatment Standards.
The City, acting at the direction of the WRA, reserves the right to establish more stringent limitations or requirements on discharges to the POTW than those contained in this chapter if deemed necessary to comply with the purpose and policy objectives presented in Section 100.05 of this chapter.
1. A user discharging or with potential to discharge any waste into the POTW as set forth in Section 100.11, 100.12 or 100.13 of this division shall be required by the WRA Director to construct, install and operate, at the user's sole expense, such pretreatment facilities as may be required in order to:
B. Control the quantities and rates of discharge of such wastewater.
C. Reduce the pollutants to such concentration and flows as may be contained in the user's wastewater discharge permit.
D. Prevent the discharge of liquid waste containing FOG, sand in excessive amounts, any flammable waste, or other harmful pollutants. All traps or similar devices shall be of a type and capacity needed to perform effectively and shall be readily and easily accessible for cleaning and inspection. All traps or devices shall be provided and maintained in efficient operating condition at all times. Materials removed from traps shall be considered unacceptable for disposal at the WRF unless specifically approved by the WRA Director.
2. All plans, specifications, technical operating data and other information pertinent to the proposed operation and maintenance of pretreatment facilities shall be reviewed and approved by the WRA Director prior to construction. Design and installation of such facilities shall be subject to the requirements of all applicable codes, chapters and laws, including local zoning regulations. The review and approval of such plans and operating procedures shall, in no way, relieve the user from the responsibility of modifying the facility as necessary to produce an effluent acceptable to the WRA Director under this chapter. Any subsequent changes in the pretreatment facilities or method of operations shall be reported to and be acceptable to the WRA Director prior to the user's initiations of the changes.
3. Users shall continuously maintain all pretreatment facilities required by this chapter in satisfactory and effective operating condition at the sole expense of such user.
4. No section contained in this chapter shall be construed to prevent or prohibit a separate or special agreement between the WRA and any user whereby wastewater containing waste of unusual strength, character or composition may be accepted for treatment, subject to additional payment by such user; provided, however, that such agreement shall have the prior approval of the WRA Board, shall not conflict with the Iowa Department of Natural Resources and U.S. Environmental Protection Agency requirements, and shall be consistent with Subsection 100.66(2) and Sections 100.13 and 100.14 of this chapter, and Subsection 6 of this section.
5. The WRA Director may reject any waste which, in the opinion of the director, may cause interference or pass through.
6. Users shall obtain the specific approval of the WRA Director prior to discharging any waste resulting from a pretreatment facility to the POTW.
The WRA Director may develop a documentation system to track the transportation and final disposition of any pretreatment waste. Pretreatment waste regulated by this subsection shall include waste generated as a result of pretreatment processes used to comply with National Pollutant Discharge Elimination System permits, air pollution permits, wastewater discharge permits, soil/groundwater reclamation processes, and pollutants resulting from a spill of any liquid or solid material or the cleanup of any such spill. Pretreatment waste is prohibited from disposal to the water of the state except as specifically permitted by the Iowa Department of Natural Resources.
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