A.
Users shall not contribute or cause to be contributed, directly or
indirectly, any pollutant or wastewater which will interfere with
the operation or performance of the facility. These general prohibitions
apply to all such users of a facility, whether or not the user is
subject to National Categorical Pretreatment Standards or any other
national, state or local pretreatment standards or requirements.
B.
Users shall not contribute the following substances to any facility.
(1)
Any wastewater which causes a hazard to human life or creates a public
nuisance.
(2)
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 facility or to the operation of the facility.
(3)
Any prohibited materials including but 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 are a fire hazard or a general
hazard to the system.
(4)
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 fats, oil and grease.
(5)
Any wastewater having a pH less than 5.5 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 facility.
(6)
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 facility or 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 Section 307(a) of
the Act.
(7)
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.
(8)
Any substance which may cause the facility's effluent or any other
product of the facility, such as grit, sludges or scums, to be unsuitable
for reclamation and reuse or to interfere with the solids reclamation
process. In no case shall a substance discharged to the facility cause
the facility to be in noncompliance with biosolids use or disposal
criteria, guidelines or regulations developed under Section 405 of
the Act; or any criteria, guidelines or regulations affecting biosolids
use or disposal developed pursuant to the Solid Waste Disposal Act,
the Clean Air Act, the Toxic Substances Control Act or state criteria.[1]
[1]
Editor's Note: See 42 U.S.C. § 6901 et seq., 42
U.S.C. § 7401et seq., and 15 U.S.C. § 2605 et
seq., respectively.
(9)
Any substance which will cause the facility to violate its NPDES
and/or state disposal system permit or the receiving water quality
standards.
(10)
Materials which exert or cause:
(a)
Unusual concentrations of dissolved solids (such as, but not
limited to, sodium chloride and sodium sulfate.)
(b)
Excessive discoloration (such as, but not limited to, dye wastes
and vegetable tanning solutions).
(c)
A biochemical oxygen demand (BOD) greater than 280 mg/l or chemical
oxygen demand (COD) greater than 300 mg/l as determined from analysis
of a twenty-four-hour composite sample.
(d)
A total suspended solid load greater than 200 mg/l as determined
from analysis of a twenty-four-hour composite sample.
(e)
A fats, oil and grease load greater than 100 mg/l as determined
from analysis of the average of two grab samples.
(f)
An average chlorine demand greater than 15 parts per million.
(11)
Any wastewater or vapor having a temperature which will inhibit
biological activity in the facility resulting in interference, but
in no case wastewater with a temperature at the introduction into
the facility pipelines which exceeds 150° F. or a flow weighted
average temperature over an eight-hour period greater than 100°
F.
(12)
Any pollutants, including oxygen-demanding pollutants (BOD,
etc.), released at a flow rate and/or pollutant concentration which
a user knows or has reason to know will cause interference to the
facility. In no case shall a slug load have a flow rate or contain
concentrations or qualities of pollutants that exceed, for any time
period longer than 15 minutes, more than five times the average twenty-four-hour
concentration, quantities or flow during normal operation.
(13)
Any wastewater containing any radioactive wastes or isotopes
of such half-life or concentration as may exceed limits established
by the Engineer in compliance with applicable state or federal regulations.
(14)
Any organic solid waste, either whole or shredded, unless a
screening device of not less than 14 mesh is installed downstream
of the shredding equipment prior to discharge.
(15)
Any waters or wastes containing strong-acid iron-pickling wastes
or concentrated plating solutions, whether neutralized or not, unless
covered under the National Categorical Pretreatment Standard.
(16)
Waters or wastes containing substances which are not amenable
to treatment or reduction by treatment processes employed or are amenable
to treatment only to such degree that the facility's effluent cannot
meet the DNREC permit requirements or other agencies having jurisdiction
over discharge to the receiving waters.
A.
Any waters or wastes containing metals and similar objectionable
or toxic substances exerting an excessive treatment requirement, to
such degree that any such material received in the respective composite
sewage at the facility exceeds the limits established by the Engineer
for such materials, or which creates a hazard in the receiving water
of said facility.
B.
The following substances are not permitted in concentrations above
those listed. Upon written determination by the Engineer, restrictions
may also be placed on other specific substances, or the present concentration
limits revised, when it is shown that the presence of these substances
or concentrations at any facility is sufficient to adversely affect
any portion of the treatment processes.
|
Substance
|
Maximum Allowable Concentration
(mg/l)
|
|---|---|
|
Arsenic (As)
|
0.5
|
|
Cadmium (Cd)
|
0.4
|
|
Chromium (hexavalent) (Cr)
|
0.2
|
|
Cyanide (Cn)
|
0.5
|
|
Lead (Pb)
|
0.5
|
|
Copper (Cu)
|
1.0
|
|
Mercury (Hg)
|
0.5
|
|
Nickel (Ni)
|
2.0
|
|
Zinc (Zn)
|
5.0
|
|
Total Toxic Organics (TTO) < EPA-recommended individual constituent
limit
| |
|
Total trihalomethanes (TTHMs)
|
0.08
|
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 this article and which, in the judgment
of the Engineer or as required by the National Pollutant Discharge
Elimination System (NPDES), SWDA, DNREC, National Categorical Pretreatment
Standards and/or approval authority, may have a deleterious effect
upon the sewage works, processes, equipment or receiving waters or
which otherwise create a hazard to life or constitute a public nuisance,
the Engineer shall:
(1)
Require that the waste discharge be stopped or reject the application
to discharge proposed waste;
(2)
Require pretreatment in compliance with National Categorical Pretreatment
Standards before 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 not covered by existing taxes or sewer charge ordinances.
B.
If the Engineer 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 Engineer and subject
to the requirements of all applicable codes, ordinances and laws.
Grease, oil and sand interceptors or traps shall be provided
when, in the opinion of the Engineer, they are necessary for the proper
handling of liquid wastes containing fats, oil and grease in excess
of the stated limits in this chapter or any flammable wastes, grit
or other harmful ingredients, except that such interceptors shall
not be required for residential dwelling or apartment units. Interceptors
shall be of a type and capacity approved by the Engineer and shall
be located as to be readily and easily accessible for cleaning and
visual inspection.
Where pretreatment or flow-equalizing structures and/or equipment
are required by permit, they shall be maintained continuously in satisfactory
and effective operation by the owner, at the owner's expense and accessible
for unannounced inspection by the Engineer.
Upon the promulgation of the Federal Categorical Pretreatment
Standards for a particular industrial subcategory, the federal standard,
if more stringent than limitations imposed under this chapter for
sources in that subcategory, shall immediately supersede the limitations
imposed under this chapter. The Engineer shall notify all affected
users of the applicable reporting requirements under 40 CFR 403.12.
Where the County's wastewater treatment system achieves consistent
removal of pollutants limited by Federal Pretreatment Standards, the
County may apply to the approval authority for modification of specific
limits in the Federal Pretreatment Standards. "Consistent removal"
shall mean reduction in the amount of a pollutant or alteration of
the nature of the pollutant by the wastewater treatment system to
a less toxic or harmless state in the effluent, which is achieved
by the system in 95% of the samples taken when measured according
to the procedures set forth in Section 403.7(c)(2) of Title 40 of
the Code of Federal Regulations, Part 403, General Pretreatment Regulations
for Existing and New Sources of Pollution, promulgated pursuant to
the Act (as may be amended). The County may then modify pollutant
discharge limits in the Federal Pretreatment Standards if the requirements
contained in 40 CFR 403.7 are fulfilled and prior approval from the
approval authority is obtained.
State requirements and limitations on discharges shall apply
in any case where they are more stringent than federal requirements
and limitations or those in this chapter.
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 County or
state.
A.
Each user shall provide protection from accidental discharge of prohibited
materials or other substances regulated by this chapter. Equipment
and/or processes preventing accidental discharge of prohibited materials
shall be installed and maintained at the owner or user's expense.
Detailed plans showing equipment and operating procedures shall be
submitted by user to the County for review on a date to be determined
by the County. No user who commences contribution to a facility shall
be permitted to introduce pollutants into the system until accidental
discharge procedures have been approved by the County. Review and
approval of such plans and operating procedures shall not relieve
the user from the responsibility to modify the user's equipment and/or
processes as necessary to meet the requirements of this chapter.
B.
In the case of an accidental discharge, it is the responsibility
of the user to immediately telephone and notify the County of the
incident. The notification shall include the location of the discharge,
the type of waste, concentration and volume and corrective actions.
(1)
Written notice. Within five days following an accidental discharge,
the user shall submit to the Engineer a detailed written report describing
the cause of the discharge and the measures to be taken by the user
to prevent similar future occurrences. Such notification shall not
relieve the user of any expense, loss, damage or other liability which
may be incurred as a result of damage to the facility, environmental
or any other damage to person or property; nor shall such notification
relieve the user of any fines, civil penalties or other liability
which may be imposed by this chapter or other applicable law.
(2)
Notice to employees. A notice shall be permanently posted on the
user's bulletin board or other prominent place advising employees
whom to call in the event of an accidental discharge. Employers shall
ensure that all employees who may cause or suffer such a discharge
to occur are advised of the emergency notification procedure.
