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The provisions of this chapter are enacted to aid in the enforcement of the pretreatment regulations set forth herein. The City of Ankeny, by enacting this chapter, designates the WRA and its operating contractor as the enforcement agency under this chapter for those customers located such that their wastewater is conveyed to the WRF. Employees, agents and officers of the WRA and of its operating contractor, while acting to enforce the provisions of this chapter for the WRA, are empowered to make such inspections, issue such orders or permits and take such actions within the corporate boundaries of the City of Ankeny as are authorized by this chapter. The WRA and its operating contractor are also authorized to impose and collect all fees or penalties authorized by this chapter and are also authorized to directly bill and collect from contributors any penalties, fees, charges and surcharges. The failure to pay any fee, charge, penalty or surcharge is a municipal infraction and shall also be grounds to discontinue sewer service. The enforcement of this chapter in the City of Ankeny is not dependent upon passage of this or a similar ordinance by other cities or WRA participating communities. The City of Ankeny shall retain control over the use of its local sewers for purposes of capacity allocation and surcharge prevention.
This chapter seeks to implement provisions of the Act, the General Pretreatment Regulations found at 40 CFR, Part 403, and the Iowa Administrative Code, Chapter 567, Sections 62.4 and 62.8. This chapter is to be construed and applied in accordance with the Clean Water Act Amendments, the General Pretreatment Regulations, the Iowa Administrative Code and the purpose and policy provisions set forth in Section 100.05 herein.
This chapter regulates the use of sanitary sewers, private wastewater disposal, the installation and connection of building sewers, and the discharge of water and wastewater into the POTW. This chapter sets forth uniform requirements for all users who discharge into the POTW, and the deposit of wastewater and waste hauled to the WRF or to locations approved by the WRA Director for disposal and treatment. The objectives of this chapter are:
1. To prevent the introduction of pollutants into the POTW that may interfere with the operation of the system or interfere with sludge management and disposal;
2. To prevent the introduction of pollutants into the POTW that may pass through the system inadequately treated and ultimately into receiving water, the atmosphere, or otherwise be incompatible with the system;
3. To protect workers' safety and health and to protect against damage to the POTW;
4. To provide for equitable distribution of treatment and industrial pretreatment costs resulting from pollutants introduced into the POTW.
The following requirements apply to all users of the POTW:
1. All users shall promptly notify the WRA Director in advance of any substantial change in the volume or character of pollutants in their discharge.
2. 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.
3. Industrial users shall notify the WRA Director, the EPA 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 part 261. The notification shall comply with the requirements set forth in 40 CFR 403.12(p).
4. Discharge of any pollutants without the notice and approval required by this chapter is prohibited. Upon the receipt of notice required by this chapter the WRA Director shall within 180 days or less approve the discharge if the Director finds the proposed discharge meets applicable pretreatment standards and requirements and would not cause the WRA to violate its NPDES permit. The 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 the POTW to violate its NPDES permit. In lieu of denial of permission the WRA Director may allow such contribution or discharge upon conditions which would not violate applicable pretreatment standards or requirements and would not cause the WRF to violate its NPDES permit.
5. Food service establishments shall be regulated first under Chapter 101 of this Code of Ordinances but may be required to obtain a wastewater discharge permit and be subject to the requirements of this chapter if the WRA Director determines that additional pretreatment is required in order to comply with fat, oil and grease discharge limits.
Any part of this section notwithstanding, upon receipt of the notice required by this section, the Director may require, in addition to the requirements of this section, that an industrial user obtain a permit under this chapter. 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 100.41 hereof.
The following general prohibitions apply to all users of the POTW unless the user is subject to a more restrictive NCPS, IDNR, or wastewater discharge permit limit. The following substances are prohibited from discharge to the POTW:
1. Pollutants which create a fire or explosion hazard in the POTW, including, but not limited to, waste streams with a closed cup flashpoint of less than 140ºF (60ºC) 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 (5%), nor any single reading greater than ten percent (10%).
2. Substances 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 (½) inch in 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, waste paper, 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 wax, FOG, or other substances which may solidify or become viscous at temperatures between 32º and 150ºF (0º and 65ºC).
(Ord. 1959 - Feb. 19 Supp.)
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 150ºF (65ºC) 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 104ºF (40ºC).
6. Petroleum oil, nonbiodegradable 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 sewage pursuant to 10 CFR 20.2003.
(Ord. 2118 - Sep. 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 3000 mg/l non-volatile or 3000 mg/l total dissolved solids unless approved by the Administrator or 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.
(Ord. 2118 - Sep. 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 users contributing the following specific pollutants to the POTW shall not exceed the allowable total pounds. The allocation of pollutants between industrial and non-industrial 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 |
NH
3 |
13,000 | 6,959 |
TKN | 27,760 | 16,950 |
Maximum Allowable Headworks Loading Pounds/Day | Maximum Allowable Industrial Loading Pounds/Day | |
Pollutant | Total | Industrial |
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 |
(Ord. 1959 - Feb. 19 Supp.)
3. Discharge Concentration Limits and Review Criteria.
A. The discharge into the POTW of any materials, water, or waste having a pollutant concentration greater than the limits in subsections C, D and E below, or containing pollutants not listed herein, shall be subject to the review and approval of the WRA Director. After review of the proposed discharges, the Director may:
(1) Reject the waste for reasons consistent with Section 100.05.
(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 to prevent slug loads.
(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 where local limits are more restrictive than NCPS, 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 steps (1) through (7) as appropriate.
B. Users discharging wastewater to the POTW having pollutant concentrations or flows greater than the following shall be considered industrial users for purposes of sewer charges and may be regulated or permitted by the Director as appropriate:
Pollutant | Daily Maximum (mg/l) |
Pollutant | Daily Maximum (mg/l) |
BOD | 200 |
TSS | 250 |
COD | 300 |
FOG – T | 100 |
TKN | 30 |
NH
3
- N | 15 |
An average daily flow greater than 5000 gallons or having an unusual concentration of flow.
(Ord. 1959 - Feb. 19 Supp.) | |
C. Pollutant Limits. Average and maximum concentration limits for users without an NCPS for these pollutants shall be:
30-day Average Allowable Pounds/Day | ||
Pollutant | Daily Maximum (mg/l) | Monthly Average (mg/l) |
30-day Average Allowable Pounds/Day | ||
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 |
TVPH | 10.0 | -- |
Zinc - T | 19.64 | 13.09 |
(Ord. 1959 - Feb. 19 Supp.)
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 | ||
(Ord. 1959 - Feb. 19 Supp.)
E. Gasoline Cleanup Projects – Daily Maximum Limit. Discharge of wastewater from sites where gasoline is being removed from 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 provision of this section shall be construed to provide lesser discharge standards than are presently or may hereafter be imposed and required by U.S. EPA or IDNR, or to allow the average allowable total loading for any pollutant at the headworks of the WRF to be exceeded.
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