Sec. 17-161. - Process wastewater discharge limitations.
Part of the Code of Ordinances of East Providence, RI.
The text
(a)
Significant industrial users and dischargers. All industrial users and dischargers subject to categorical pretreatment standards under 40 CFR chapter I, subchapter N, and all non-categorical dischargers that, in the opinion of the city, have a reasonable potential to adversely affect the POTW's operation, or that contribute a process waste stream which makes up five percent or more of the average dry weather hydraulic or organic capacity of the POTW treatment plant, or that discharge an average of 25,000 gallons per day or more of process wastewater to the POTW, shall be subject to the following process wastewater discharge limitations.
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PROCESS WASTEWATER DISCHARGE LIMITATIONS PARAMETER UNITS MAX. ONE DAY CONCENTRATION MONTHLY AVERAGE CONCENTRATION
Total Cadmium mg/l 0.11 0.07
Total Chromium mg/l 2.77 1.71
Total Copper mg/l 3.38 2.07
Total Lead mg/l 0.69 0.43
Total Nickel mg/l 1.94 1.16
Total Silver mg/l 0.43 0.24
Total Zinc mg/l 2.61 1.48
Total Cyanide mg/l 1.2 0.65
Total Toxic Organics (TTO) mg/l 2.13 ———
Total Oil and Grease (O&G) mg/l 100 ———
Biochemical Oxygen Demand mg/l 500
Biochemical Oxygen Demand lb/day 30
Plastic Materials, Synthetic & Resins & Nonvulcanizable Elastomers (SIC 2831)
Biochemical Oxygen Demand Malt Beverages (SIC 2082) lb/day 300
Total Suspended Solids mg/l 1,000
Total Suspended Solids
Plastic Materials, Synthetic & Resins & Nonvulcanizable Elastomers (SIC 2831) mg/l 1,000
Total Suspended Solids
Malt Beverages (SIC 2082) lb/day 300
Total Process Flow gal/day * ———
(b)
Phase approach to pretreatment.
(1)
Existing sources at the request of the superintendent shall submit information describing the toxic load reductions achievable through implementation of best practicable technology (BPT) and installation of pretreatment facilities. This information will be used to develop permit conditions for each SIU discharging significant toxic loads, to minimize the impact to the POTW.
(2)
The city may characterize the residual toxic loads discharged to the POTW after BPT or pretreatment facilities have been incorporated by each SIU. If excessive toxic loads remain or increase due to future industrial activities, the city may require the installation of additional pretreatment facilities at existing sources discharging significant toxic loads.
(3)
New sources shall incorporate BPT prior to plant startup to minimize the introduction of toxic loads into the sewer system. If significant residual loads are expected after incorporation of BPT, the superintendent shall require the installation of pretreatment facilities prior to plant startup.
(Rev. Ords. 1987, § 17-161; Ch. 446, § VIII, 8-12-97; Ch. 891, § I, 8-29-23)