Town of Bridgeville, DE General Sewer Use Requirements

§ 190-16 Prohibited discharge standards.

No person 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 and industrial users of the POTW whether or not they are subject to Categorical Pretreatment Standards or any other national, state or local pretreatment standards or requirement. Furthermore, no user or industrial user may contribute the following substances to the POTW:

(1)

Pollutants which create a fire or explosive hazard in the municipal wastewater collection and POTW, including but not limited to waste streams with a closed-cup flashpoint of less than one hundred forty degrees Fahrenheit (140º F.) [sixty degrees Celsius (60º C.)] using the test methods specified in 40 CFR 261.21.

(2)

Any wastewater having a pH of less than six point five (6.5) or more than eight point five (8.5), or otherwise causing interference or corrosive structural damage to the POTW or equipment, or endangering town personnel.

(3)

Solid or viscous substances in amounts which will damage equipment or cause obstruction of the flow in sewers or the POTW or result in interference. In no case shall solids be greater than three (3) inches in any dimension.

(4)

Any wastewater containing pollutants, including oxygen demanding pollutants (BOD, etc.), 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 either the POTW or any wastewater treatment or sludge process, or which will constitute a hazard to humans or animals.

(5)

Any wastewater having a temperature greater than one hundred fifty degrees Fahrenheit (150º F.) [sixty-five degrees Celsius (65º C.)], 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 one hundred four degrees Fahrenheit (104º F.) [forty degrees Celsius (40º C.)].

(6)

Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin, in amounts that will cause interference or pass through.

(7)

Any 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)

Any trucked or hauled pollutants, except at discharge points designated by the town in accordance with § 190-27.

(9)

Any 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, a hazard to life or to prevent entry into the sewers for maintenance and repair.

(10)

Any wastewater which imparts color which cannot be removed by the treatment process, such as but not limited to dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent thereby causing interference or violating the town's NPDES permit. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation point for photosynthetic activity by more than ten percent (10%) from the seasonably established norm for aquatic life.

(11)

Any wastewater containing any radioactive wastes or isotopes except as specifically approved by the Commissioners in compliance with applicable state or federal regulations.

(12)

Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water and unpolluted industrial wastewater, unless specifically authorized by the Commissioners.

(13)

Any sludges, screenings or other residues from the pretreatment of industrial wastes, except as allowed by permit.

(14)

Any medical wastes, except as specifically authorized by the Commissioners in a wastewater discharge permit.

(15)

Any wastewater causing the treatment plant's effluent to fail a toxicity test.

(16)

Any wastes containing detergents, surface active agents or other substances which may cause excessive foaming in the POTW.

Wastes prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW. All floor drains located in process or materials storage areas must discharge to the industrial user's pretreatment facility before connecting with the POTW.

§ 190-17 Federal Categorical Pretreatment Standards.

The National Categorical Pretreatment Standards found at 40 CFR Chapter I, Subchapter N, Parts 405-471 are hereby incorporated.

§ 190-18 Specific pollutant limitations.

[Amended 7-11-2016 by Ord. No. 16-2]

The following pollutant limits are established to protect against pass-through and interference. The following limits apply to discharges into the sewer system:

	Constituent	Maximum Allowable Composite Concentration (milligrams per liter)
	TBOD	350
	SBOD	150
	TSS	450
	TKN	30
	Oil and grease	100
	pH	6.5 to 8.5 standard units

Concentrations apply at the point where the waste is discharged to the POTW. All concentrations for metallic substances are for total metal unless indicated otherwise. At their discretion, the Commissioners may impose mass limitations in addition to or in place of the concentration-based limitations above. When imposing mass limits, the above-listed concentration limits shall be converted to mass limits using an appropriate flow which is no greater than the maximum allowable flow for the user. The Commissioners may modify or increase mass limits for industrial users as long as the total loading allocated to all industrial users does not exceed the maximum allowable industrial loadings from the most recent local limits evaluation.

§ 190-19 Town's right of revision.

The Commissioners reserve the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW if deemed necessary to comply with the objectives presented in § 190-12 of this Part 2 or the general and specific prohibitions in § 190-16 of this Part 2.

§ 190-20 Special agreement.

The Commissioners reserve the right to enter into special agreements with industrial users setting out special terms under which they may discharge to the POTW. In no case will a special agreement waive compliance with a pretreatment standard or requirement. However, the industrial user may request a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15. They may also request a variance from the Categorical Pretreatment Standards from EPA. Such a request will be approved only if the industrial user can prove that factors relating to its discharge are fundamentally different from the factors considered by EPA when establishing that pretreatment standard. An industrial user requesting a fundamentally different factor variance must comply with the procedural and substantive provisions in 40 CFR 403.13.

§ 190-21 Dilution.

No user or industrial 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 Commissioners may impose mass limitations on industrial users when the imposition of mass limitations is appropriate.

§ 190-22 Soluble biochemical oxygen demand allocation.

Provided that there is a soluble biochemical oxygen demand (SBOD) reserve capacity at the POTW, the provisions of this section allow allocation of reserve capacity to permitted industrial users under conditions specified herein:

The Commissioners reserve the right to allocate SBOD reserve capacity whenever such allocation will, in the opinion of the Commissioners, comply with the objectives of the limits set forth in § 190-18 of this Part 2. Each written request for an allocation shall be considered on a case-by-case basis by the Commissioners. In all matters concerning an allocation, the Commissioners shall use their discretion in determining whether an allocation will be granted and the amount of allocation thereof. The decision of the Commissioners will be final.

The provisions of this section shall apply only when all the following conditions are met:

(1)

The POTW has reserve capacity of SBOD, POTW SBOD reserve capacity may be determined at any time by the Commissioners and shall be determined using: (total POTW SBOD capacity) - (current demands and allocations) - (town set aside of reserve SBOD capacity for future growth of not less than twenty-five percent (25%) of the total POTW SBOD capacity) = POTW SBOD Reserve for Allocations [where the total POTW SBOD capacity is the maximum design load for SBOD calculated at three hundred seventy-five (375) pounds per day. This number may be recalculated and the ordinance amended by resolution following any plant improvements that increase SBOD capacity.]

(2)

An industrial user shall not be eligible for an SBOD allocation, if they contribute more than twenty-five percent (25%) of the total wastewater flow to the POTW.

A request for an allocation shall be made in writing to the Commissioners. Accompanying the request shall be the industrial user's wastewater quality information sufficient to allow for a proper review of the request. The Commissioners shall, within sixty (60) days of receiving a written request, approve the request, deny the request or respond to the user with a request for more information.

The Commissioners shall not issue an SBOD allocation in excess of reserve capacity as defined in Subsection B(1) above.

The Commissioners reserve the right to revoke or revise existing allocations after providing at least sixty (60) days notification if and as required to prevent pass through or interference, protect the health and safety of workers, facilitate sludge management and disposal and protect against damage to the POTW.

The Commissioners may, at their discretion, assess surcharge fees to permittees granted SBOD allocations. Discharges that exceed the allocated limit in the user's permit are a violation of this Part 2 and the user's permit and will be addressed per Articles X, XI, XII and/or XIII of this Part 2. Such fees shall be those as determined or revised from time to time by resolution of the Commissioners.

SBOD allocations shall be set forth in the industrial user's industrial wastewater discharge permit. The permit shall indicate the quantity of allocation and provide a method for determining compliance with the allocation.