[Amended 12-4-2019 by Ord. No. 2019-14]
If the Director of Public Works allows the pretreatment or equalization of waste flows, the design and installation of the systems and equipment shall be subject to the review and approval of the Director of Public Works and the state (See Article
III, Pretreatment of Wastewater).
A. Maximum allowable industrial loadings limitations.
(1) For all users connected to sewer lines that are tributary to the
City of Lebanon POTW, the Director of Public Works will not issue
permits that in combination with other industrial loads exceed the
values in the following table:
Pollutant
|
Maximum Allowable Industrial Loading
(lb/day)
|
---|
Arsenic
|
0.405
|
Cadmium
|
0.476
|
Chromium (total)
|
2.705
|
Copper
|
1.568
|
Cyanide (total)
|
1.259
|
Lead
|
2.056
|
Mercury
|
0.101
|
Nickel
|
3.670
|
Selenium
|
1.534
|
Silver
|
2.006
|
Zinc
|
1.994
|
(2) All limitations for metals represent total metals, regardless of
the valance state, or the physical or chemical form of the metal.
To administer these allowable loadings through IDPs, the Director
of Public Works may impose concentration-based limitations, or mass
limitations. For industrial users, the values written into IDPs for
the above pollutants shall apply at the end of the industrial waste
stream and prior to dilution with nonindustrial wastewaters.
(3) Daily concentrations are the concentration of a pollutant discharged,
determined from the analysis of a flow-composited sample (or other
sampling procedure approved by the Director of Public Works) representative
of the discharge over the duration of a twenty-four-hour day or industrial
operating schedule of less than 24 hours.
(4) All concentration limits for metals represent total metal unless
indicated otherwise.
(5) Unless specifically identified in an industrial discharge permit,
an industrial user shall not discharge the locally limited pollutants
at concentrations significantly greater than domestic/background concentrations.
B. Screening levels.
(1) The following pollutants (list below is not all-inclusive) shall
not be discharged to the Lebanon Treatment Works exceeding concentrations
listed below without approval of the Director of Public Works:
Pollutant
|
Screening Level
(mg/L)
|
Pollutant
|
Screening Level
(mg/L)
|
---|
Acetone
|
372
|
Nitrogen (TKN)
|
35
|
Benzene
|
0.001
|
Oil and grease (animal and vegetable origin)
|
250
|
Biochemical oxygen demand
|
300
|
Oil and grease (petroleum origin)
|
100
|
Carbon disulfide
|
0.007
|
Phenols (total)
|
1.0
|
Chloride
|
1,500
|
Phenol
|
50
|
Chlorine (total residual)
|
6.0
|
Sulfate
|
150
|
Chloroform
|
0.065
|
Sulfide
|
1.0
|
p - Cresol
|
0.33
|
Sulfite
|
280
|
1, 2 - Dichloropropane
|
3.0
|
Surfactants
|
100
|
Ethylbenzene
|
1.35
|
Total suspended solids
|
350
|
(2) Screening levels are numerical values above which actions are initiated
to evaluate, prevent or reduce adverse impacts due to flammability,
chemical reactivity, organic/solids loadings, interference, toxicity,
pass-through, or worker health and safety.
(3) If any of the screening levels are exceeded, repeat sampling and
analyses may be required to verify compliance or noncompliance with
that screening level. If noncompliance is indicated, then the industrial
user may be required, at the discretion of the Director of Public
Works, to conduct an appropriate engineering evaluation to determine
the potential impact of the discharge of this pollutant to the City's
Lebanon Treatment Works or, alternatively, to develop a pollution
prevention plan specifically addressing the pollutant that exceeds
the screening level. This study or plan must be conducted under the
supervision and approval of the City. Should the evaluation indicate
the impact to be unsatisfactory, the industrial user shall reduce
the pollutant concentration to a satisfactory level. If the evaluation
supports development of an alternate site-specific limitation, then
the screening level shall be adjusted and administered as a limit
for the specific discharge.
(4) If an industrial user proposes to discharge at concentrations greater
than the concentration-based screening level maintained by the Director
of Public Works, then the industrial user may be required to conduct
the evaluations described in the previous paragraph. Should the evaluations
support an alternate site-specific limitation, then the screening
level may, at the discretion of the Director of Public Works, be adjusted
as a special agreement for the industrial user and administered as
a permit limitation for the specific discharge.
C. Special agreements. No statement contained in this section, except for §
136-10, Prohibited discharge standards, Subsections
A and
B, and §
136-11, Federal categorical pretreatment standards, shall be construed as preventing any special agreement or arrangement between the City and any industrial user whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, provided that said agreements do not contravene any requirements of existing federal or state laws, and/or regulations promulgated thereunder, are compatible with any user charge system in effect, and do not waive applicable federal categorical pretreatment standards. Special agreement requests shall require submittal of a pollution prevention plan that specifically addresses the discharge for which a special agreement is requested.
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.
Users implementing process changes may request
that compliance be determined based on mass limitations in lieu of
concentration limitations. Such mass-based limitations will be calculated
from the permitted concentration-based limitations and flows and shall
be equivalent to or less than the mass discharge in effect at the
time of the request. The intent of a mass-based limit is to encourage
and allow pollution prevention and/or water conservation measures
that might cause a facility to increase pollutant concentrations in
their discharge even though the total mass of the pollutant discharged
does not increase, and may in fact decrease. Decisions on granting
requests for mass-based compliance limitations will be based on user-specific
information and current operating conditions of the Lebanon Treatment
Works, and will be at the discretion of the Director of Public Works.
Implementation of mass-based limitations may not contravene any requirements
of federal or state laws and/or regulations implemented thereunder,
and may not waive applicable categorical pretreatment standards.