[Adopted 11-24-1980 by Ord. No. 116]
Unless the context specifically indicates otherwise, the following
terms used in this article shall have the meanings indicated in this
section:
The Mount Gretna Authority.
The Borough of Mount Gretna.
Any natural person, partnership, firm, or other legal entity.
Household waste, liquids, human excreta, or other materials
commonly known as sewage, but shall not include roof or surface waters.
Any pipe forming part of the sewer system.
The sewer system and sewage treatment plant owned and operated
by the Authority, not including stormwater sewers.
A.Â
Prohibited discharge. No person shall discharge into the sewer system
any surface water, exhaust steam or any oils, tar, grease, gas, bensine
or other combustible gases or liquids, or any garbage (unless treated
in an approved manner), offal, insoluble solids or industrial waste
or other dangerous or harmful substances which would adversely affect
the functioning of the sewer system or the processes of sewage treatment.
(1)Â
Garages or service stations shall install interceptors of the types
Series GA, GX, GNC or GRC of Josam Manufacturing Company, Michigan
City, Indiana, or equivalent. Other commercial establishments discharging
waste containing oils or greases shall be required to install an interceptor
of the above mentioned type when directed by the Authority.
(2)Â
No person shall discharge to the sewer system any sewage or industrial
wastes having any of the following characteristics:
(a)Â
Wastes containing liquids, solids or gases which by reason of
their nature or quantity may cause fire, explosion, or in any other
way be injurious to persons, the structures of the sewer system or
its operation.
(b)Â
Wastes having a temperature in excess of 150° F. or less
than 32° F.
(c)Â
Wastes having a pH lower than 5.5 or higher than 9.0 or having
any corrosive properties capable of causing damage or hazard to structures,
equipment or personnel of the sewer system. Where the Authority deems
it advisable, any person discharging industrial wastes may be required
to install and maintain at his own expense, in a manner approved by
the Authority or their designated representative, a suitable device
to continuously measure and record the pH of the wastes discharged,
and/or a readily accessible sampling manhole for additional sampling
of discharged wastes.
(d)Â
Wastes containing noxious or malodorous gas or substance which
either singly or by interaction with sewage or other wastes is, in
the opinion of the Authority, likely to create a public nuisance or
hazard to life, or prevent entry to sewerage structures for their
maintenance and repair.
(e)Â
Wastes containing ashes, cinders, sand, mud, straw, shavings,
metal, glass, rags, feathers, tar, plastics, wood, hair, chemical
or paint residues, greases, lime slurry, or viscous materials of such
character or in such quantity that, in the opinion of the Authority,
they may cause an obstruction to the flow in the sewers or otherwise
interfere with the proper operation of the sewer system. Attention
is called to the fact that the maximum permissible concentration will
vary throughout the sewer system depending upon the size of the particular
interceptor sewer receiving the same and the flow of the rein.
(f)Â
Wastes containing insoluble, nonflocculent substances having
a specific gravity in excess of 2.65.
(g)Â
Wastes containing soluble substances in such concentration as
to cause the specific gravity of the waste to be greater than 1.1.
(h)Â
Wastes containing any of the following substances in solution
or in suspension in concentrations exceeding those shown in the following
table:
Substance
|
Maximum Permissible Concentration
|
---|---|
Phenolic compounds as C5H6OH
|
1.0 mg/L
|
Cyanides as CN
|
0 mg/L
|
Cyanates as CNO
|
0.3 mg/L
|
Iron as Fe
|
5.0 mg/L
|
Trivalent chromium as Cr+
|
0.3 mg/L
|
Hexavalent chromium as Cr
|
0.5 mg/L
|
Nickel as Ni
|
1.0 mg/L
|
Copper as Cu
|
0.3 mg/L
|
Lead as Pb
|
0.5 mg/L
|
Zinc as Zn
|
0.3 mg/L
|
(i)Â
Wastes containing more than 100 mg/L by weight of fat, oil,
or grease.
(j)Â
Wastes containing more than 10 mg/L of any of the following
gases: hydrogen sulfide, sulfur dioxide, nitrous oxide, or any of
the halogens.
(k)Â
Wastes containing gases or vapors, either free or occluded,
in concentrations toxic or dangerous to human or animals.
(l)Â
Wastes containing toxic substances in quantities sufficient
to interfere with the biochemical processes of the sewage treatment
works or that will pass through the treatment process and still exceed
the state and federal requirements for the receiving stream.
(m)Â
Wastes containing toxic radioactive isotopes without a special
permit.
B.Â
Use of sewers by industry. The Authority can reserve the right to
refuse connection to a sewer, or to compel discontinuance of use of
a sewer, or to compel pretreatment of industrial waste by an industry,
in order to prevent discharge to the sewer deemed to be harmful to
the sewer system, or to have a deleterious effect on the sewage treatment
or sludge-handling processes.
A.Â
Although the sewage treatment works will be capable of treating certain
abnormal industrial wastes, the actual treatment of such waste may
increase the cost of operating and maintaining the sewer system. Therefore,
there will be imposed upon each person discharging such industrial
waste into the sewer system a surcharge(s), which are intended to
cover such additional costs.
B.Â
The strength of any industrial waste, the discharge of which is to
be subject to surcharge, shall be determined quarterly, or more frequently
as the Authority shall determine, from samples taken either at the
manhole or industrial metering chamber or at any other sampling point
mutually agreed upon by the Authority and the producer of such waste.
The frequency and duration of the sampling period shall be such as,
in the opinion of the Authority, will permit a reasonably reliable
determination of the average composition of such waste, exclusive
of stormwater runoff. Samples shall be collected or their collection
supervised by a representative of the Authority and shall be in proportion
to the flow of waste, exclusive of stormwater runoff, and composited
for analysis in accordance with the latest edition of "Standard Methods
of the Examination of Water and Waste Water." Except as hereinafter
provided, the strength of the waste so found by analysis shall be
used for establishing the surcharge or surcharges. However, the Authority
may, if it so elects, accept the results of routine sampling and analyses
by the producer of such waste in lieu of making its own samplings
and analyses.
C.Â
Computation of surcharge.
(1)Â
In the event any industrial waste is found, by the Authority, to
have a BOD in excess of 300 milligrams per liter and/or suspended
solids concentration in excess of 350 milligrams per liter, the producer
of said waste shall pay a strength-of-waste surcharge, which surcharge
shall be computed by using the following formula:
(2)Â
Where the concentration of the waste is less than 300 mg/L for BOD
or 350 mg/L for suspended solids, the values in parentheses for BOD
and/or suspended solids, as applicable, shall be equal to one. The
amount of the strength-of-waste surcharge shall be computed by multiplying
the flat rate of volume charge, set by the Authority, by the surcharge
factor derived above.
D.Â
The strength-of-waste surcharge provided for in this section shall
be added to the sewerage service charges imposed by the Authority.
Such surcharge shall be collected in the manner provided by the Authority
for collection of service charges.