A. No person shall discharge or cause to be discharged any stormwater,
surface water, groundwater, roof runoff subsurface drainage, uncontaminated
cooling water or unpolluted industrial process waters to any sanitary
sewer, except by the expressed authority of the City.
B. Stormwater and all other unpolluted drainage shall be discharged
to storm sewers, if available, or to a natural outlet approved by
the City. Industrial cooling water or unpolluted process waters may
be discharged, on approval of the City and the New Hampshire Water
Supply and Pollution Control Commission, to a storm sewer, if available,
or an approved natural outlet.
No person shall discharge or cause to be discharged any of the
following described waters or wastes to any public sewers without
installation of a trap interceptor or separator, as applicable:
A. Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive
liquid, solid or gas.
B. Any waters or wash containing toxic or poisonous solids, liquids
or gases in sufficient quantity, either singly or by interaction with
other wastes, to injure or interfere with any sewage treatment process,
to constitute a hazard to humans or animals, to create a public nuisance
or to create any hazard at the sewage treatment plant or its receiving
waters, including but not limited to cyanides in excess of 0.004 milligrams
per liter as CN in the wastes as discharged to the public sewer.
C. Any waters or wastes having a pH lower than 5.5, or having any other
corrosive property capable of causing damage or hazard to structures,
equipment and personnel engaged in the operation and maintenance of
the sewer system.
D. Solid or viscous substances in quantities or of such size capable
of causing obstruction to the flow in sewers or other interference
with the proper operation of the sewer system, such as, but not limited
to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags,
feathers, tar, plastics, wood, unground garbage, whole blood, paunch
manure, hair and fleshings, entrails and paper dishes, cups, milk
containers, etc., either whole or ground by garbage grinders.
No person shall discharge or cause to be discharged the following
described substances, materials, waters or wastes if it appears likely
in the opinion of the City, that such wastes can harm either the sewers,
sewage treatment process or equipment, have an adverse effect on the
receiving stream or can otherwise endanger life, limb or public property
or constitute a nuisance. In forming such opinion as to the acceptability
of these wastes, the City will give consideration to such factors
as the quantities of subject wastes in relation to the flows and velocities
in the sewers, the materials of construction of the sewers, the nature
of the sewage treatment process, the capacity of the sewage treatment
plant, and other pertinent factors. The substances prohibited are:
A. Any liquid or vapor having a temperature higher than 150° F.
(65° C.).
B. Any water or waste containing fats, wax, grease or oils, whether
emulsified or not, in excess of 100 milligrams per liter or containing
substances which may solidify or become viscous at temperatures between
32° and 150° F. (0° to 65° C.).
C. Any waters or wastes containing strong acid iron pickling wastes
or concentrated plating solutions, whether neutralized or not.
D. Any waters or wastes containing iron, chromium, copper, zinc, and
similar objectionable or toxic substances or wastes exerting an excessive
chlorine requirement, to such degree that any such material received
in the composite sewage at the sewage treatment plant exceeds the
limits established by the Environmental Protection Agency or the state
for such materials.
E. Any waters or wastes containing phenols or other taste- or odor-producing
substances in such concentrations as to exceed limits which may be
established by the City as necessary, after treatment of the composite
sewage, to meet the requirements of the state, federal or other public
agencies of jurisdiction for such discharge to the receiving waters.
F. Any radioactive wastes or isotopes of such half-life or concentration
as may exceed limits established by the City in compliance with applicable
state or federal regulations.
G. Any water or wastes having a pH in excess of 9.5.
H. Material which exerts or causes:
(1) Unusual concentrations of inert suspended solids (such as, but not
limited to, fuller's earth, lime slurries and lime residues) or of
dissolved solids (such as, but not limited to, sodium chloride and
sodium sulfate).
(2) Excessive discoloration (such as, but not limited to, dye wastes
and vegetable tanning solution).
(3) Unusual BOD, chemical oxygen demand or chlorine requirements in such
quantities as to constitute a significant load on the sewage treatment
works.
(4) Unusual volume of flow or concentration of wastes, or both, constituting
slugs, as defined herein.
I. Waters or wastes containing substances which are not amenable to
treatment or reduction by the sewage treatment processes employed
or are amenable to treatment only to such degree that the sewage treatment
plan effluent cannot meet the requirements of other agencies having
jurisdiction over discharge to the receiving waters.
A. If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in §
189-32 of this article and which, in the judgment of the City, may have a deleterious effect upon the sewer system, processes, equipment or receiving waters or which otherwise create a hazard to life or constitute a public nuisance, the City may:
(2) Require pretreatment to an acceptable condition for discharge to
the public sewers;
(3) Require control over the quantities and rates of discharge; and/or
(4) Require payment to cover the added cost of handling and treating
the wastes.
[Amended 7-26-1976 by Ord. No. 4-76.4]
B. If the City permits the pretreatment or equalization of waste flows,
the design and installation of the plants and equipment shall be subject
to the review and approval of the City and subject to the requirement
of all applicable codes, ordinances and laws.
Grease, oil and sand interceptors shall be provided when, in
the opinion of the City, they are necessary for the proper handling
of liquid wastes containing grease in excessive amounts or any flammable
wastes, sand or other harmful ingredients; except that such interceptors
shall not be required of private living quarters or individual dwelling
units. All interceptors shall be of a type and capacity approved by
the City and shall be located as to be readily and easily accessible
for cleaning and inspection.
Where preliminary treatment or flow-equalizing facilities are
provided for any waters or wastes, they shall be maintained continuously
in satisfactory and effective operation by the owner at his expense.
When required by the City, the owner of any property serviced
by a building sewer carrying industrial wastes shall install a suitable
control manhole together with such necessary meters and other appurtenances
in the building sewer to facilitate observation, sampling and measurement
of the wastes. Such manhole, when required, shall be accessibly and
safely located and shall be constructed in accordance with plans approved
by the City. The manhole shall be installed by the owner at his expense
and shall be maintained by him so as to be safe and accessible at
all times.
All industries discharging into a public sewer shall perform
such monitoring of their discharges as the City may reasonable require,
including installation, use and maintenance of monitoring equipment
and keeping records and reporting the results of such monitoring to
the City. Such records shall be made available, upon request by the
City, to other agencies having jurisdiction over discharges to the
receiving waters.
The City, through its duly authorized employees and officials,
bearing proper credentials and identification, shall be permitted
to enter all properties for the purpose of inspection, observation,
measurement, sampling and testing, in accordance with the provisions
of this chapter. The City or its, representatives shall have no authority
to inquire into any processes, including metallurgical, chemical,
oil, refining, ceramic or paper or other industries beyond that point
having a direct bearing on the kind and source of discharge to the
sewers or waterways or facilities for waste treatment.
All measurements, tests and analyses of the characteristics
of waters and wastes, to which reference is made in this chapter,
shall be determined in accordance with the latest edition of Standard
Methods for the Examination of Water and Wastewater, published by
the American Public Health Association, and shall be determined at
the control manhole provided, or upon suitable samples taken at said
control manhole. In the event that no special manhole has been required,
the control manhole shall be considered to be the nearest downstream
manhole from the building sewer in the public sewer to which the building
sewer is connected. Sampling shall be carried out by customarily accepted
methods to reflect the effect of constituents upon the sewer system
and to determine the existence of hazards to life, limb and property.
(The particular analyses involved will determine whether a twenty-four-hour
composite of all outfalls of a premises is appropriate or whether
a gap sample or samples should be taken. Normally, but not always,
BOD and suspended solids analyses are obtained from twenty-four-hour
composites of all outfalls, whereas pH is determined from periodic
gram samples.)
[Amended 7-26-1976 by Ord. No. 4-76.4]
Provided that such agreements do not contravene any requirements
of existing federal laws and are compatible with any user charge and
industrial cost recovery system in effect, no statement contained
in this article shall be construed as precluding any special agreement
or arrangement between the City and any industrial concern whereby
an industrial waste of unusual strength or character may be accepted
by the City for treatment, subject to extra payment therefor by the
industrial concern.