Borough of Mount Gretna, PA Industrial Waste Discharge

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)

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)

No person shall discharge to the sewer system any sewage or industrial wastes having any of the following characteristics:

(a)

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)

Wastes having a temperature in excess of 150° F. or less than 32° F.

(c)

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)

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)

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)

Wastes containing insoluble, nonflocculent substances having a specific gravity in excess of 2.65.

(g)

Wastes containing soluble substances in such concentration as to cause the specific gravity of the waste to be greater than 1.1.

(h)

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)

Wastes containing more than 100 mg/L by weight of fat, oil, or grease.

(j)

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)

Wastes containing gases or vapors, either free or occluded, in concentrations toxic or dangerous to human or animals.

(l)

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)

Wastes containing toxic radioactive isotopes without a special permit.

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.

§ 141-3 Surcharge for certain industrial wastes.

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.

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.

Computation of surcharge.

(1)

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:

Factor % =

- 100%

(2)

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.

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.