§ 106-126. General sewer use requirements.

(a)

Prohibited discharge standards.

(1)

General prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the POTW whether or not they are subject to categorical pretreatment standards or any other national, state, or local pretreatment standards or requirements.

(2)

Specific prohibitions.

a.

No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:

1.

Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140 degrees Fahrenheit (60 degrees centigrade) using the test methods specified at 40 CFR 261.21;

2.

Wastewater having a pH less than 5.0 or more than 12.5, or otherwise causing corrosive structural damage to the POTW or equipment;

3.

Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference, but in no case solids greater than three inches in any dimension;

4.

Pollutants, including oxygen-demanding pollutants, released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW or which could interfere with wastewater conveyance;

5.

Wastewater having a temperature greater than 150 degrees Fahrenheit (66 degrees centigrade), or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104 degrees Fahrenheit (40 degrees centigrade);

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;

8.

Trucked or hauled pollutants, except at discharge points designated by the director;

9.

Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;

10.

Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;

11.

Stormwater, surface water, groundwater, roof runoff, subsurface drainage, swimming pool drainage, condensate, unless specifically authorized by the director;

12.

Sludges, screenings, or other residues from the pretreatment of industrial wastes;

13.

Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test;

14.

Detergents, surface-active agents, or other substances which might cause excessive foaming in the POTW;

15.

Polar fats, oils, or greases in concentrations greater than 200 mg/l in any instantaneous sample;

16.

Wastewater causing two readings on an explosion hazard meter at the point of discharge into the POTW, or at any point in the POTW, of more than five percent or any single reading over ten percent of the lower explosive limit of the meter;

b.

Pollutants, substances, or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.

(b)

National categorical pretreatment standards. Users must comply with the categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405—471.

(1)

When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the director may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual IUs.

(2)

When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the director shall impose an alternate limit in accordance with 40 CFR 403.6(e).

(c)

State pretreatment standards. Users must comply with the State Act and all applicable regulations promulgated therefrom.

(d)

Local limits.

(1)

The director is authorized to establish local limits pursuant to 40 CFR 403.5(c). The director may impose mass limitations in addition to, or in lieu of, concentration-based limitations, as defined below. These local limits apply at the point of discharge to the public sewer. All concentrations for metallic substances are for total metal. Quantification of the listed constituents shall follow EPA-approved standard analytical methods.

(2)

The following pollutant limits are established to protect against pass through and interference. No person shall discharge wastewater containing in excess of the following:

a.

The following daily maximum limits for flows greater than 10,000 gpd;

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b.

The following monthly average limits for flows equal to or less than 10,000 gpd:

Pollutant	Daily Maximum Limits for Monthly Average Flows Greater than 10,000 GPD	Monthly Average Limits for Monthly Average Flows Equal to or Less than 10,000 GPD
Cadmium	0.03 mg/l	0.0025 pounds/day
Copper	3 mg/l	0.25 pounds/day
Lead	0.2 mg/l	0.017 pounds/day
Silver	0.3 mg/l	0.025 pounds/day
Zinc	10 mg/l	0.83 pounds/day
Five-Day Biochemical Oxygen Demand (BOD 5 )	2,700 mg/l	225 pounds/day
Total Suspended Solids (TSS)	3,000 mg/l	250 pounds/day
Ammonia Nitrogen (NH 3 -N)	200 mg/l	17 pounds/day
Phosphorus, Total	60 mg/l	5 pounds/day

 

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c.

The director may develop BMPs in individual wastewater discharge permits or in general permits to implement local limits.

(e)

County's right of revision. The county reserves the right to establish, by ordinance or in individual wastewater discharge permits or in general permits, more stringent standards or requirements on discharges to the POTW consistent with the purpose of this division.

(f)

Dilution. No user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement. The director may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.

(Code 1994, § 114-92; Ord. No. SWR-2010-001, 11-16-2010)