(a) 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.
(b) Specific
prohibitions.
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, wastestreams with a closed-cup flashpoint of less
than 140°F (60°C) using the test methods specified in 40 CFR
261.21;
(2) Wastewater having corrosive properties capable of causing damage or injury to structures, equipment and/or personnel of the POTW, as per the specific prohibition in the applicable local limits in section
86-104. In no case shall wastewater containing a pH less than 5.0 be discharged unless the works is specifically designated to accommodate such discharges;
(3) Solid or viscous substances in amounts which will cause obstruction
of the flow in the POTW resulting in interference, blockage, or damage
to the POTW.
(4) 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 the POTW;
(5) Wastewater having a temperature greater than 150°F (65°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 104°F (40°C);
(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 of public works and the control authority in accordance with section
86-111 of this article;
(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 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 violating the applicable NPDES permit;
(11) Wastewater containing any radioactive wastes or isotopes except in
compliance with applicable state or federal regulations;
(12) Stormwater, surface water, ground water, artesian well water, roof
runoff, subsurface drainage, and unpolluted wastewater, unless specifically
authorized by the director of public works and the control authority;
(13) Sludges, screenings, or other residues from the pretreatment of industrial
wastes;
(14) Medical wastes, except as specifically authorized by the director
of public works and/or the control authority in a wastewater discharge
permit;
(15) Wastewater causing, alone or in conjunction with other sources, the
treatment plant’s effluent to fail a toxicity test;
(16) Detergents, surface-active agents, or other substances which may
cause excessive foaming in the POTW;
(17) Fats, oils, or greases of animal or vegetable origin in concentrations greater than that specified in the applicable local limits in section
86-104;
(18) A discharge of water, normal domestic wastewater, or industrial waste
that which in quantity of flow exceeds, for a duration of longer than
15 minutes, more than four times the average 24 hour flow during normal
operations of the industry;
(19) Insecticides and herbicides in concentrations that are not amenable
to treatment;
(20) Polychlorinated biphenyls;
(21) Garbage that is not properly shredded to such an extent that all
particles will be carried freely under the flow conditions normally
prevailing in wastewater mains, with no particle having greater than
one-half inch cross-sectional dimension;
(22) Wastewater or industrial waste generated or produced outside the
city, unless approval in writing from the director of public works
and the control authority has been given to the person discharging
the waste; or,
(23) Without the approval of the director of public works and the control
authority, a substance or pollutant other than industrial waste, normal
domestic wastewater, septic tank waste or chemical toilet waste that
is of a toxic or hazardous nature, regardless of whether or not it
is amenable to treatment, including but not limited to bulk or packaged
chemical products.
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.
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(Ordinance 1574, § 1, 2-11-03)
The categorical pretreatment standards found at 40 CFR Chapter
I, Subchapter N, Parts 405-471 are hereby incorporated.
(1) Where
a categorical pretreatment standard is expressed only in terms of
either the mass or the concentration of a pollutant in wastewater,
the director of public works may impose equivalent concentration or
mass limits in accordance with 40 CFR 403.6(c).
(2) When
wastewater subject to a categorical pretreatment standard is mixed
with wastewater not regulated by the same standard, the director of
public works shall impose an alternate limit using the combined wastestream
formula in 40 CFR 403.6(e).
(3) A user
may obtain a variance from a categorical pretreatment standard if
the user can prove, pursuant to the procedural and substantive provisions
in 40 CFR 403.13, that factors relating to its discharge are fundamentally
different from the factors considered by EPA when developing the categorical
pretreatment standard.
(4) A user
may obtain a net gross adjustment to a categorical standard in accordance
with 40 CFR 403.15.
(Ordinance 1574, § 1, 2-11-03)
The following pollutant limits are established to protect against
pass through and interference. No person shall discharge or cause
or permit to be discharged, wastewater containing in excess of the
following maximum allowable discharge limits into the central regional
wastewater system:
0.2 mg/l arsenic
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0.1 mg/l cadmium
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2.9 mg/l chromium
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2.3 mg/l copper
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0.5 mg/l cyanide
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0.9 mg/l lead
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0.0004 mg/l mercury
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0.2 mg/l Molybdenum
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4.6 mg/l nickel
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200 mg/l oil and grease
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0.1 mg/l selenium
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0.8 mg/l silver
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8.0 mg/l zinc
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2.13 mg/l TTO
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5.5 = pH = 11.0
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The above limits apply at the point where the wastewater is
discharged to the POTW. All concentrations for metallic substances
are for “total” metal unless indicated otherwise. The
director of public works may impose mass limitations in addition to,
or in place of, the concentration-based limitations above.
(Ordinance 1574, § 1, 2-11-03)
The city reserves the right to establish, by ordinance or in
wastewater discharge permits, more stringent standards or requirements
on discharges to the POTW.
(Ordinance 1574, § 1, 2-11-03)
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 of public works 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.
(Ordinance 1574, § 1, 2-11-03)
No industry shall discharge wastewater containing a BOD or TSS
loading that causes the city’s prorata share of the total BOD
or TSS loading to the POTW system to exceed the city’s prorata
share of the total flow to the POTW system. (Example: If the city
contributes 25 percent of the total wastewater flow to the system,
the city’s cumulative BOD or TSS loading to the system, as measured
at the city’s points of entry to the system, shall not exceed
25 percent of the total BOD or TSS loading to the system.)
Any industry with a wastewater strength that will cause the
city’s cumulative wastewater loading, at the city’s points
of entry, to exceed the city’s prorata share of the total wastewater
loading based upon flow, shall be required to install pretreatment
facilities to reduce its wastewater strength to an acceptable level.
(Ordinance 1574, § 1, 2-11-03)