Town of Millsboro, DE Use of Wastewater Sewers

No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operation or performance of the town's waste system. These general prohibitions apply to all such users, whether or not the user is subject to National Categorical Pretreatment Standards or any other national, state or local pretreatment standards or requirements. A user may not contribute the following substances to the sewer system:

(1)

Any liquids, solids or gases which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the sewer system and the treatment plant or to the operation of the same. At no time shall two successive readings on an explosion hazard meter at the point of discharge into the system (or at any point in the system) be more than 5% nor any single reading over 10% of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides and any other substances which the town, the state or EPA regards as a fire hazard or a hazard to the system.

(2)

Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities, such as but not limited to: grease, garbage with particles greater than 1/2 inch in any dimension, animal guts or tissue, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper, wood, plastics, gas, tar, asphalt residues, residues from refining, or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes.

(3)

Any wastewater having a pH less then 6.0 or greater than 9.5, or wastewater having any other corrosive property capable of causing damage or hazard to structures, equipment and/or personnel of the sewer and treatment system.

(4)

Any wastewater constituting a rate of discharge or substantial deviation from normal rates of discharge ("slug discharge") sufficient to cause interference in the operation and performance of the wastewater facilities.

(5)

Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, create a toxic effect in the receiving waters of the sewer and treatment system, or to exceed the limitation set forth in a categorical pretreatment standard. A toxic pollutant shall include but not be limited to any pollutant identified pursuant to § 307(a) of the Federal Water Pollution Control Act, as amended, 33 U.S.C. § 1251 et seq.

(6)

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

(7)

Any substance which may cause the sewer and treatment system's effluent or any other product of the sewer and treatment system, such as residues, sludges or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case shall a substance discharged to the sewer system cause the town's treatment plant to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under § 405 of the Federal Water Pollution Act, any criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act or state criteria applicable to the sludge management method being used.

(8)

Any substance which will cause the town's sewage treatment plant to violate its NPDES permit or the receiving water quality standards.

(9)

Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.

(10)

Any wastewater having a temperature which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater with a temperature at the introduction into the sewer system which exceeds 40º C. (104º F.).

(11)

Any waters or wastes that for a duration of 15 minutes has a concentration greater than five times that of normal sewage, as measured by suspended solids and BOD, and/or which is discharged continuously at a rate exceeding 200 gallons per minute, except by special permit. Normal domestic sewage shall be construed to fall within the following limits:

	Constituents	Permissible Limits
	BOD	300 ppm
	Chlorine demand	15 ppm
	Settleable solids	20 ml/l
	Suspended solids	300 ppm
	Ammonia nitrogen	30 ppm

(12)

Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the applicable state or federal regulations.

(13)

Any wastewater containing viable pathogenic bacteria other than those normal to domestic sewage.

Specific pollutant limitations. No person shall discharge wastewater containing maximum instantaneous concentration in excess of:

	Parts Per Million	Substance
	10.0	Aluminum sulfate
	0.1	Arsenic as AS
	2.0	Barium
	1.0	Boron as B
	0.2	Cadmium as Cd
	0.1	Chromium (hexavalent)
	0.5	Chromium (total)
	1.0	Copper as Cu
	2.0	Cyanide as CN
	10.0	Ether soluble matter
	5.0	Iron as Fe
	1.0	Lead as Pb
	0.01	Mercury as Hg
	1.0	Nickel as Ni
	0.005	Phenols
	0.2	Silver as Ag
	0.02	Selenium
	50	Total nitrogen
	5000	Total solids
	3.0	Zinc as Zn
	100	Oil, grease or fat

Excessive discharge. 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 the limitations contained in the Federal Categorical Pretreatment Standards or in any other pollutant-specific limitation developed by the town, State of Delaware or EPA.

If, in establishing discharge restrictions, discharge limits or pretreatment standards pursuant to this Part 1, the manager establishes concentration limits to be met by an industrial user, the manager, in lieu of concentration limits, shall establish mass limits of comparable stringency for an individual industrial user at the request of such user.

No person shall discharge or cause to be discharged to any wastewater facilities, wastewaters containing substances subject to an applicable Federal Categorical Pretreatment Standard promulgated by EPA in excess of the quantity prescribed in such applicable pretreatment standards, except as otherwise provided in this section. Compliance with such applicable pretreatment standards shall be within three years of the date the standard is promulgated; provided, however, that compliance with a categorical pretreatment standard for new sources shall be required upon promulgation.

Upon application by a Class III user, the manager shall revise any limitations on substances specified in the applicable pretreatment standards to reflect removal of the substances by the wastewater treatment facility. The revised discharge limit for specified substances shall be derived in accordance with federal law.

Upon application by a Class III user, the manager shall adjust any limitation on substances specified in the applicable pretreatment standards to consider factors relating to such person which are fundamentally different from the factors considered by EPA during the development of the pretreatment standard. Requests for and determinations of a fundamentally different adjustment shall be in accordance with federal law.

The manager shall notify any Class III user affected by the provisions of this section and establish an enforceable compliance schedule for each.