(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
13.08.033. 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 DCO and the control authority in accordance with division 3
of this article;
(9) Noxious or malodorous liquids, gases, solids, or other wastewater
which, either singly or by interaction with other wastes, is 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, groundwater, artesian well water, roof
runoff, subsurface drainage, and unpolluted wastewater, unless specifically
authorized by the DCO 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 DCO 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
13.08.033;
(18) A discharge of water, normal domestic wastewater, or industrial waste
which in quantity of flow exceeds, for a duration of longer than fifteen
minutes, more than four times the average twenty-four-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 (1/2") cross-sectional dimension;
(22) Wastewater or industrial waste generated or produced outside the
city, unless approval in writing from the DCO and the control authority
has been given to the person discharging the waste; or
(23) Without the approval of the DCO 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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(2005 Code, sec. 13.4.110)
(a) The categorical pretreatment standards found at 40 CFR chapter I,
subchapter N, parts 405– 471, are hereby incorporated.
(b) Where a categorical pretreatment standard is expressed only in terms
of either the mass or the concentration of a pollutant in wastewater,
the DCO may impose equivalent concentration or mass limits in accordance
with 40 CFR 403.6(c).
(c) When wastewater subject to a categorical pretreatment standard is
mixed with wastewater not regulated by the same standard, the DCO
shall impose an alternate limit using the combined wastestream formula
in 40 CFR 403.6(e).
(d) 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 the EPA
when developing the categorical pretreatment standard.
(e) A user may obtain a net gross adjustment to a categorical standard
in accordance with 40 CFR 403.15.
(2005 Code, sec. 13.4.111)
(a) 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 instantaneous maximum allowable discharge limits:
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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2.1 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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2.1 mg/l TTO
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5.5 pH 11.0
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(b) 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 DCO may impose mass limitations
in addition to, or in place of, the concentration-based limitations
above.
(2005 Code, sec. 13.4.112)
The city reserves the right to establish, by ordinance or in
wastewater discharge permits, more stringent standards or requirements
on discharges to the POTW.
(2005 Code, sec. 13.4.113)
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 DCO 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.
(2005 Code, sec. 13.4.114)
(a) No industry shall discharge wastewater containing a BOD or TSS loading
that causes the city’s pro rata share of the total BOD or TSS
loading to the POTW system to exceed the city’s pro rata share
of the total flow to the POTW system. (Example: If the city contributes
25% 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% of the total BOD
or TSS loading to the system.)
(b) 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 pro rata 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.
(2005 Code, sec. 13.4.115)