Stormwater, groundwater, roof drainage, street drainage, yard drainage or subsurface drainage shall not be discharged through direct or indirect connections to the public sanitary sewer of the Town.
Unpolluted water, including but not limited to cooling water, process water or blow-down from cooling towers or evaporative coolers shall be discharged to such sewers as are specifically designated as storm drains or to a natural outlet upon receiving approval from applicable local, state and federal agencies as required.
A. 
Waste from garbage grinders shall not be discharged into a public sewer except:
(1) 
Residential waste generated in preparation of food normally consumed on the premises; or
(2) 
Where the commercial, industrial, or multiuse structure user has obtained a permit for the specific use from the Director and agrees to undertake whatever self-monitoring is required to enable the Town to determine equitably the charges and fees based on the waste constituents and characteristics.
B. 
Such grinders must shred the waste to a degree that all particles will be carried freely under normal flow conditions prevailing in the public sewer. Garbage grinders shall not be used for grinding plastic, paper products, inert materials or garden refuse.
A. 
No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(1) 
Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid or gas.
(2) 
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 wastewater treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the wastewater facilities.
(3) 
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 wastewater facilities.
(4) 
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 wastewater facilities 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.
B. 
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 Director that such wastes can harm either sewers, wastewater 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 Director will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in sewers, materials of construction of the sewers, nature of the wastewater treatment process, capacity of the wastewater treatment works, degree of treatability of wastes in the wastewater treatment works, and other pertinent factors. The substances prohibited are:
(1) 
Any liquid or vapor having a temperature higher than 150° Fahrenheit (65.9° Celsius).
(2) 
Any waters or wastes containing more than 100 mg/l of oil or grease of animal or vegetable origin, containing more than 25 mg/l of oil or grease of mineral or petroleum origin, or containing substances which may solidify or become viscous at temperatures between 32° and 150° Fahrenheit (0° and 65.9° Celsius).
(3) 
Any waters or wastes containing strong acid iron pickling wastes or concentrated plating solutions whether neutralized or not.
(4) 
Any waters or wastes containing objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such discharge exceeds limits established by this chapter at the point of discharge into the public sewer.
(5) 
Any waters or wastes containing phenols or other taste- or odor-producing substances, in such concentrations exceeding limits which may be established under this chapter as necessary, to meet the requirements of state, federal or other public agencies.
(6) 
Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits established under this chapter in compliance with applicable state and federal regulations.
(7) 
Any waters or wastes having a pH in excess of 9.5.
(8) 
Unusual volume of low or concentration of wastes constituting “slugs” as defined herein.
(9) 
Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment process employed, or are amenable to treatment only to such degree that the wastewater treatment works effluent cannot meet the requirements of the Blackstone Valley Sewer District Commission or the Narragansett Bay Water Quality Management District Commission, state, federal or other agencies having jurisdiction over discharge to the receiving waters.
If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which contain the substances or possess the characteristics enumerated in § 207-50, the Director may:
A. 
Reject the wastes;
B. 
Require pretreatment, under the industrial pretreatment program described in § 270-56 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 in the form of surcharges, calculated according to the rate structure, to cover the added cost of handling and treating the wastes. A wastewater discharge permit must be obtained from the Director prior to discharge of any restricted wastes into the public sewers. The permit, shall include all monitoring and compliance conditions, and the calculations of any surcharges to be levied against the person discharging restricted wastes.
If the Director 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 Director, and subject to the requirements of all applicable state and federal codes, ordinances, and laws. 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.
Grease, oil and sand interceptors shall be provided when, in the opinion of the Director, they are necessary for the proper handling of liquid wastes containing grease in excess amounts, or any flammable wastes, sand or other harmful ingredients. 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 Director and shall be located as to be readily and easily accessible for cleaning and inspection. Grease interceptors shall be provided at restaurants and all other public eating places. Where grease, oil and sand interceptors are required to be installed, they shall be maintained continuously in satisfactory and effective operation by the owner at his expense.
Any person proposing a new discharge into the system, or a substantial change in the volume or character or pollutants that are being discharged into the system shall notify the Director at least 45 days prior to the proposed change or connection. Such notification will not relieve users of liability for any expense, loss or damage to the sewer system, wastewater treatment works or treatment processes.
A. 
No person shall discharge wastewater containing metals in excess of the following levels:
Constituent
Milligrams Per Liter
Arsenic
0.1
Boron
1.0
Cadmium
0.2
Total chromium
0.5
Copper
0.5
Cyanide
0.5
Lead
0.1
Mercury
0.01
Nickel
0.5
Silver
0.03
Zinc
1.0
B. 
The above levels shall be considered maximum and subject to stricter control by the Blackstone Valley Sewer District Commission or the Narragansett Bay Water Quality Management District Commission.
A. 
The Environmental Protection Agency has required the Blackstone Valley Sewer District Commission and the Narragansett Bay Water Quality Management District Commission to develop and implement industrial pretreatment programs. The major purpose of the program is to prohibit or limit industrial discharges which could be harmful to the treatment process or cause the treatment facility to exceed the standards of their discharge permit, as described in § 270-50.
B. 
This chapter authorizes the monitoring and other actions necessary for the operation of these pretreatment programs which are incorporated by reference herein.
C. 
Any new regulations or discharge limitations which are promulgated by the Environmental Protection Agency or the state will supersede any requirements listed in the pretreatment programs or in this chapter.