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.