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Table of Contents » Title 18 Water and Sewers » Chapter 6 Sewer Use Regulations » § 18-609 Specific pollutant limitations.
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18
Title 18
18-1
Title 18, Chapter 1
18-101
§ 18-101
Halls
Title 18 : Water and Sewers
Chapter 6 : Sewer Use Regulations

18-609 : Specific pollutant limitations.

  1. Restrictions on wastewater strength. No person shall discharge wastewater containing in excess of the concentrations listed for each of the following pollutants:

    Pollutant Daily Average* Maximum Concentration (mg/l) Instantaneous Maximum Concentration (mg/l) 30 Day Avg. Maximum Concentration (mg/l)
    Cadmium 0.5 0.7 0.26
    Chromium 4.0 5.9 1.93
    Copper 11.2 16.8 4.5
    Cyanide 12.5 19.0 3.8
    Lead 3.7 5.6 1.2
    Mercury 0.1 0.2 0.04
    Nickel 18.8 28.7 8.2
    Total Phenolic Compounds 4.6 7.0 2.0
    Silver 1.1 1.6 0.56
    Zinc 10.0 5.8 4.2
    Benzene 0.2 0.3 0.09
    Total Phthalates 0.4 0.6 0.18
    Chloroform 5.6 8.5 2.44
    Ethylbenzene 1.0 1.4 0.4
    Naphthalene 0.06 0.08 0.02
    Toluene 6.72 9.8 2.8
    1,1,1 Trichloroethane 15.1 23.1 6.6
    Carbon Tetrachloride 0.9 1.5 0.43
    Tetrachloroethylene 12.8 19.6 5.6
    Trichloroethylene 15.8 23.1 6.6
    1,2 trans Dichloroethylene 0.6 0.8 0.2
    Methylene Chloride 15.0 21.8 6.25

    *Based on 24-hour flow proportional composite samples.

    Analyses for all pollutants listed herein shall be conducted in accordance with the requirements of 40 CFR Part 136 or equivalent methods approved by the United States Environmental Protection Agency.

  2. Criteria to protect the POTW treatment plant influent. The town shall monitor the POTW treatment plant influent for each parameter in the following table. Analyses for all pollutants listed herein shall be conducted in accordance with the requirements of 40 CFR Part 136 or equivalent methods approved by the United States Environmental Protection Agency. All industrial users shall be subject to the reporting and monitoring requirements set forth in § 18-618(8), Reporting Requirements for Permittee, and § 18-618(10), Inspection and Sampling, as to these parameters. In the event that the influent at the POTW treatment plant reaches or exceeds the levels established by said table, the control authority shall initiate technical studies to determine the cause of the influent violation, and shall recommend to the town such remedial measures as are necessary, including, but not limited to recommending the establishment of new or revised pretreatment levels for these parameters. The control authority shall also recommend changes to any of these criteria in the event the POTW effluent standards are changed or in the event that there are changes in any applicable law or regulation affecting same or in the event changes are needed for more effective operation of the POTW.

    Parameter Maximum Concentration in 24 Hour Flow Proportional Composite Sample (mg/l) Maximum Instantaneous Concentration Grab Sample (mg/l)
    BOD 200 400
    TSS 200 400
    NH3-N 20 40
    Copper 0.10 0.20
    Total Chromium 0.12 0.24
    Nickel 0.21 0.42
    Cadmium 0.01 0.02
    Lead 0.05 0.10
    Mercury 0.001 0.002
    Silver 0.01 0.02
    Zinc 0.41 0.82
    Cyanide 0.25 0.50
    Toluene 0.14 0.28
    Benzene 0.04 0.08
    1,1,1 Trichloroethane 0.33 0.66
    Ethylbenzene 0.02 0.04
    Carbon Tetrachloride 0.05 0.10
    Chloroform 0.22 0.44
    Tetrachloroethylene 0.28 0.56
    Trichloroethylene 0.33 0.66
    1,2 trans Dichloroethylene 0.01 0.02
    Methylene Chloride 1.25 1.50
    Total Phenols 0.10 0.20
    Naphthalene 0.0028 0.0056
    Total Phthalates 0.16 0.32