For all industrial waste constituents which are not compatible with the treatment systems and/or will persist through the treatment systems as a pollutant or toxic substance, pretreatment will be required to the extent the objectionable constituents are reduced to acceptable levels. It is the current intent of EPA to promulgate pretreatment standards for all known toxic and polluting substances, on an industrial classification basis. As these standards are developed, they will become applicable to all industries according to a schedule also to be developed by EPA. It is expected that these will be minimum standards which can be further altered to meet local conditions. Until these pretreatment standards become effective, the prohibition and limits of Article
V hereof will govern.
The variability of the rate of discharge from an industrial
establishment is an important consideration of the compatibility of
the industrial waste with the public sanitary sewage system, and is
also subject to regulation. When the variability is considered excessive
by Board review or by EPA regulation, the industry shall employ methods
and means to reduce the flow rate variability to acceptable levels.
For waste constituents compatible with the public sanitary sewage
treatment system and for which the public sanitary sewage treatment
system is to provide specific removal capability, the industrial waste
shall be subject to surcharge for such constituent concentration in
excess of the average influent value upon which the plant design was
based. The constituents to which surcharges are applicable include
BOD
5, suspended solids, ammonia nitrogen, phosphorous, ABS, and oils, fats and greases. The allowable concentrations and surcharge formula are given in Article
VII hereof.
When required by the Board, any person discharging to the public
sanitary sewage system any industrial wastes, or industrial wastes
and sanitary sewage together, shall install a suitable manhole or
manholes or metering chamber on his connecting sewer or sewers to
facilitate observation, sampling and measurement of the combined flow
or wastes from his premises. Such manhole or manholes or metering
chamber shall be accessible and safely located and shall be constructed
in accordance with plans approved by the Board or its designated representative.
The manhole or manholes or metering chamber shall be installed by
such person at his expense and shall be maintained by him so as to
be safe and accessible to the Board or its designated representative
at all times. The construction and maintenance of such manhole or
metering chamber shall be continuously monitored, transmitted and
recorded by means of an approved receiving device to be located at
the treatment plant.
Although the specific monitoring requirements will be established
for each permit at the time of application review, the general guidelines
for establishing these requirements, based on the EPA's presently
proposed rules for Pretreatment Standards for Existing and New Sources
of Pollution, published February 2, 1977 in the Federal Register,
are as follows:
A. All major contributory industries subject to EPA categorical pretreatment
standards shall be required to report quarterly, and minor contributing
industries semiannually, on their discharges. For industries not subject
to EPA categorical pretreatment standards, reporting requirements
will vary depending upon the Board's concern for the potential risk
of the discharge. EPA defines the term "categorical pretreatment standard"
as any pretreatment standard issued by the EPA Administrator pursuant
to Sections 307(b) and (c) of the P.L. 92-500 Act which applies to
a particular category or classification of indirect industrial discharges.
Major and minor contributing industries will be defined by the EPA
in these standards for each industrial category.
B. Where reports are required, the initial report shall include analyses
based on composite samples for three successive operating days for
a minor contributing industry and for each day of an operating week
for a major contributing industry. All subsequent reports will be
based on composite samples for one operating day during the month
preceding the report's required submission.
C. A composite sample is considered to be a sample composed of equal
parts taken during one-hour intervals during an operating day. All
samples shall be taken in a manner and at a location which reasonably
characterizes the discharge of the monitored pollutants.