SECTION 1. No person shall discharge or cause to be discharged any storm water, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer.
SECTION 2. Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the Superintendent, Industrial cooling water or unpolluted process waters may be discharged, on approval of the Superintendent, to a storm sewer, combined sewer, or natural outlet.
SECTION 3. 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 a pH lower than 5.5, 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 fleshing, entrails and paper dishes, cups, milk containers, etc. either whole or ground by garbage grinders.
SECTION 4. No person shall discharge or cause to be discharged the following described substances, materials, waters, or wastes if it appears likely in the opinion of the Superintendent that such wastes can harm either the sewers, sewage treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property, or constitute a nuisance. In forming his opinion as to the acceptability of these wastes, the Superintendent will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plant, degree of treat ability of wastes in the sewage treatment plant, and other pertinent factors. The substances prohibited are:
a. Any liquid or vapor having a temperature higher that on hundred fifty (150)°F (65° C).
b. Any water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of one hundred (100mg/1 or containing substances which may solidify or become viscous at temperatures between thirty-two (32) and one hundred fifty (150)° F (0 and 65°C).~
c. Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths (3/4) horsepower (0.76 hp metric) or greater shall be subject to the review and approval of the Superintendent.
d. Any waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not.
e. Any water or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the Superintendent for such materials.
f. Any waters or wastes containing phenols or other taste or order producing substances, in such concentrations exceeding limits which may be established by the Superintendent as necessary, after treatments of the composite sewage to meet the requirements of the State, Federal, or other public agencies or 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 Superintendent in compliance with applicable State or Federal regulations.
h. Any waters or wastes having a pH in excess of 9.5.
i. Materials which exert or cause:
1. Unusual concentrations of inert suspended solids (such as, but no limited to Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate).
2. Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions.
3. Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works.
4. Unusual volume of flow or concentration of wastes constituting “slugs” as defined herein.
j. Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of the other agencies having jurisdiction over discharge to the receiving water.
SECTION 5. 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 Section 4 of this Article, and which in judgment of the Superintendent, may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life of constitute a public nuisance, the Superintendent may:
a. Reject the wastes.
b. Require pretreatment to an acceptable condition for discharge to the public sewers.
c. Require control over the quantities and rates of discharge, and/or
d. Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of Section 10 of this article.
If the Superintendent 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 Superintendent, and subject to the requirements of all applicable codes, regulations and laws.
SECTION 6. Grease Traps.
1. Installation. Grease traps must be provided at installation such as restaurants, nursing home, schools, hospitals, or other installations from which large quantities of grease can be expected to be discharged.
2. Location. Grease traps shall be installed on a separate building sewer serving that part of the plumbing system into which the grease will be discharge. The discharge from the grease trap must flow to a properly designed septic tank or a building sewer prior to the septic tank.
3. Capacities. Grease traps shall have a minimum depth of 4 feet and a minimum capacity of 1000 gallons, and shall have sufficient capacity to provide at least 24 hour detention period for the kitchen flow. Kitchen flow shall be calculated in accordance with 310 CMR-15.02 (13), a copy of which is on file in the Sewer Commissioner’s Office.
4. Construction. Grease traps shall be watertight and constructed of sound and durable materials not subject to excessive corrosion, decay, or frost damage, or to cracking or buckling due to settlement or backfilling. Tanks and covers shall be designed and constructed so as to with stand normal structural loadings. A tank installed in ground water shall be weighed to prevent the tank from floating when it is emptied.
5. Depth of tees. The inlet tee shall extend to the mid depth of the tank. The outlet tee shall extend to within 12 inches of the bottom of the tank. Tees shall be cast iron or schedule 40 PVC and properly supported by a hanger, strap or other device.
6. Baffles. Baffles may be provided as necessary to maximize the separation of grease from the sewage. Baffles may be considered a substitute for the inlet and outlet tees.
7. Base. Grease traps shall be installed on a level stable base that will not settle.
8. Materials. Grease traps may be constructed of poured reinforced concrete, precast reinforce concrete or prefabricated material acceptable to the approving authority.
9. Access Manholes. Grease traps shall be provided with a minimum 24 inch diameter manhole frame and cover to grade over the inlet and outlet.
10. Accessibility. Grease traps shall be located on the lot so as to be accessible for servicing and cleaning.
11. Invert Elevation. The invert elevation of the inlet of a grease trap shall be at least 2 inches above the invert elevation of outlet. Inlet and outlet shall be located at the center line of the tank, and at least 12 inches above the maximum ground water elevation.
12. Backfill. Backfill around the grease trap shall be placed in such a manner as to prevent damage to the tank.
13. Cleaning. Grease traps shall be inspected monthly and shall be cleaned when the level of grease is 25 percent of the effective depth of the trap or at least every three months.
SECTION 6a. Oil and interceptors shall be provided when, in the opinion of the Superintendent, they are necessary for the proper handling of liquid wastes containing oil 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 Superintendent, and shall be located as to be readily and easily accessible for cleaning and inspection. As amended A.T.M. May 4, 1984.
SECTION 7. Where preliminary treatment 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.
SECTION 8. When required by the Superintendent, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with such necessary meters, and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of the wastes. Such manhole, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the Superintendent. The manhole 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.
SECTION 9. All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this regulation shall be determined in accordance with the latest edition of “Standard Methods for the Examination of Water and Wastewater.” Published by the American Public Health Association, and shall be determined at the control manhole provided, or upon suitable samples taken at said control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected. Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the sewage works and to determine the existence of hazards to life, limb, and property. (The particular analyses involved will determine whether a twenty four (24) hour composite of all outfalls of a premise is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are obtained from 24-hr composites of all outfalls whereas pH’s are determined from periodic grab samples.
SECTION 10. No statement contained in this article shall be construed as preventing any special agreement or arrangement between the Town and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the Town for treatment, subject to payment therefore, by the industrial concern.