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.
Stormwater and all other unpolluted drainage shall be discharged
to such sewers as are specifically designated as storm sewers or to
a natural outlet approved by the County. Industrial cooling water
or unpolluted process waters may be discharged, on approval of the
County, to a storm sewer or natural outlet.
No person shall discharge or cause to be discharged any of the
following described waters or wastes to any public sewers:
A. Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive
liquid, solid or gas.
B. Any waters or wastes 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,
constitute a hazard to humans or animals, create a public nuisance
or create any hazard in the receiving waters of the sewage treatment
plant.
C. Any waters or wastes having pH lower than 6.0 or having any other
corrosive property capable of causing damage or hazard to structures,
equipment and personnel of the sewage works.
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 sewage works, 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.
The following described substances, materials, waters or waste
shall be limited in discharges to County systems to concentrations
or quantities which will not harm either the sewers, wastewater treatment
process or equipment, will not have an adverse effect on the receiving
stream or will not otherwise endanger lives, limb, public property
or constitute a nuisance. The Director of the Department of Public
Works may set limitations lower than the limitations established in
the regulations following if, in his opinion, such more severe limitations
are necessary to meet the above objectives. In forming his opinion
as to the acceptability, the Director of the Department of Public
Works will give consideration to such factors as the quantity of subject
waste in relation to flows and velocities in the sewers, materials
of construction of the sewers, the wastewater treatment process employed,
capacity of the wastewater treatment plant, degree of treatability
of the waste in the wastewater treatment plant and other pertinent
factors. The limitations or restrictions on materials or characteristics
of waste or wastewaters discharged to the sanitary sewer which shall
not be violated without approval of the Director of the Department
of Public Works are as follows:
A. Any liquid or vapor having a temperature higher than 150° F.
(65° C.).
B. Wastewater containing more than 25 milligrams per liter of petroleum
oil, nonbiodegradable cutting oils or product of mineral oil origin.
C. Wastewater from industrial plants containing floatable oils, fat
or grease.
D. Any garbage that has not been properly shredded. Garbage grinders
may be connected to sanitary sewers from homes, hotels, institutions,
restaurants, hospitals, catering establishments or similar places
where garbage originates from the preparation of food in kitchens
for the purpose of consumption on the premises or when served by caterers.
E. Any waters or wastes containing objectionable or toxic substances
or wastes exerting an excessive chlorine requirement or excessive
chemical treatment, to such degree that any such material received
in composite sewage at the wastewater treatment works exceeds the
limits established by the County for such materials. The following
substances are not permitted in concentration above those listed.
Restrictions may also be placed on other substances or the present
concentration limits may be revised when it is shown that the presence
of these substances or concentrations at a treatment plant is sufficient
to adversely affect any portion of the treatment process.
|
Substance
|
Maximum Allowable Concentration
(mg/l)
|
---|
|
Arsenic as As
|
0.5
|
|
Cadmium as Cd
|
0.4
|
|
Chromium (hexavalent) as Cr
|
0.2
|
|
Copper as Cu
|
1.0
|
|
Cyanides or cyanogen compounds as CN
|
0.5
|
|
Lead as Pb
|
0.5
|
|
Mercury or mercury compounds as Hg
|
0.5
|
|
Nickel as Ni
|
2.0
|
|
Zinc as Zn
|
5.0
|
F. Any waters or wastes containing phenols or any other taste- or odor-producing
substances, in such concentrations exceeding limits which may be established
by the County 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.
G. Any radioactive wastes or isotopes of such half-life or concentration
as may exceed limits established by the County in compliance with
applicable state or federal regulations.
H. Any water or wastes having a pH in excess of 9.0.
[Amended 11-13-2012 by Ord. No. 2012-12]
I. Quantities of flow, concentration or both which constitute a slug
as defined herein.
J. Waters and wastes containing substances which are not amenable to
treatment or reduction by the wastewater treatment processes employed
or are amenable to treatment only to such degree that the wastewater
treatment plant effluent cannot meet the requirements of other agencies
having jurisdiction over discharge to the receiving waters.
K. Any water or wastes which, by interaction with other water or wastes
in the public sewer system, release obnoxious gases, form suspended
solids which interfere with the collection system or create a condition
deleterious to structures and treatment processes.
Grease, oil and sand interceptors shall be provided when, in
the opinion of the County, they are necessary for the proper handling
of liquid wastes containing floatable grease in excessive amounts
or any flammable wastes, sand or other harmful ingredients, except
that such interceptors shall not be required for private living quarters
or dwelling units. All interceptors shall be of a type and capacity
approved by the County and shall be located so as to be readily and
easily accessible for cleaning and inspection. In the maintaining
of these interceptors, the owners shall be responsible for the proper
removal and disposal by appropriate means of the captured material
and shall maintain records of the dates and means of disposal which
are subject to review by the County. Any removal and hauling of the
collected materials not performed by the owner's personnel must be
performed by currently licensed waste disposal firms.
Where pretreatment 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 County, the owner of any property serviced
by a building sewer carrying industrial wastes shall install a suitable
control structure, together with necessary meters and other appurtenances
in the control structure, to facilitate observation, sampling and
measurement of the wastes. Such structure, when required, shall be
accessibly and safely located and shall be constructed in accordance
with plans approved by the County. The structure 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.
The County may require a user of sewer services to provide information
needed to determine compliance with this Part 2. These requirements
may include:
A. Wastewater discharge peak rate and volume over a specified time period.
B. Chemical analyses of wastewaters.
C. Information on raw materials, processes and products affecting wastewater
volume and quality.
D. Quantity and disposition of specific liquid, sludge, oil, solvent
or other materials important to sewer use control.
E. A plot plan of sewers in the user's property showing sewer and pretreatment
facility location.
F. Details of wastewater pretreatment facilities.
G. Details of systems to prevent and control the losses of materials
through spills to the municipal sewer.
H. Any other information required by the flow measurement, sampling,
analysis and monitoring standards as adopted by the County.
All measurements, tests and analyses of the characteristics
of waters and wastes to which reference is made in this Part 2 shall
be determined in accordance with the latest edition of Standard Methods
for the Examination of Water and Waste Water, published by the American
Public Health Association, and shall be determined at the control
structure provided or upon suitable samples taken at said control
structure. In the event that no special structure has been required,
the control structure shall be considered to be the nearest downstream
manhole in the public sewer to the point at which the building sewer
is connected. Sampling methods, location, times, durations and frequencies
are to be determined on an individual basis by the Director of the
Department of Public Works.
No statement contained in this article shall be construed as
preventing any special agreement or arrangement between the County
and any industrial concern whereby an industrial waste of unusual
strength or character may be accepted by the County for treatment,
subject to payment therefor by the industrial concern.