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Backfill shall be in accordance with Regulations for Street and Highway Excavation, Public Works Department, Hamden, latest edition, and as supplemented hereto.
(A) Under no circumstances shall backfill be permitted around and over the pipe until the pipe, joints, lines, elevations, and workmanship has been inspected and approved by the Engineer.
(B) Wherein under § 51.18(E) the excavated material is deemed not suitable for backfill, such material shall be replaced by sand or gravel, not containing pieces larger than three inches in diameter. The furnishing and placing of satisfactory material shall be at the contractor's expense.
(C) Backfilling of trenches on private property shall proceed in the following manner: The installed pipe or structure shall be covered with approved fine material to a depth of at least one foot compacted. Compaction shall be by means of at least a 10-pound hand tamper or an approved hand mechanical tamper. Succeeding layers shall not be more than two feet in depth with each layer thoroughly compacted to the satisfaction of the Engineer before placing the next layer.
(D) Backfilling of trenches within the street area from the back of the area reserved for sidewalks to the trunk line of the sewer shall proceed in the following manner: The installed pipe or structure shall be covered with approved fine material to a depth of at least one foot compacted. Compaction shall be by means of at least a 10-pound hand tamper or an approved hand mechanical tamper. Succeeding layers of approved backfill material shall not be more than six inches in depth after compaction, with each layer thoroughly compacted to the satisfaction of the Engineer before placing the next layer. Material taken from the trench excavation shall not be used to backfill this portion of the sanitary lateral without first receiving permission from the Engineer. This permission will only be granted in the case of suitable gravel or sand. Barring receipt of this permission, the contractor must at his own expense furnish suitable gravel and place each as previously prescribed.
(Ord. 235, adopted 9-4-84) Penalty, see § 51.99
The contractor shall restore or replace all of the appurtenances of the street, including, but not limited to, pavement, curb, and sidewalk. As soon as the trench has been backfilled, a temporary cold patch surface shall be placed and maintained for safe and comfortable public passage. The permanent surface must have a minimum of eight inches gravel, four inches bounded, broken stone, and two inches bituminous concrete, unless the pavement being replaced is of a higher degree of construction. In such case, the replacement must equal existing surface. Sidewalk and curb construction will be in accordance with the latest specifications and standards governing such construction.
(Ord. 235, adopted 9-4-84) Penalty, see § 51.99
The contractor shall assume complete responsibility for the quality of the building sewer installation, and it shall not rest with the Engineer or inspector.
(Ord. 235, adopted 9-4-84) Penalty, see § 51.99
USE OF PUBLIC SEWER SYSTEM
(A) No person shall directly or indirectly discharge or cause to be discharged any sewage into any storm sewer.
(B) No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process water into any sanitary sewer.
(C) Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designed as storm sewers or to a natural outlet approved by the Engineer. Industrial cooling water or unpolluted process water may be discharged on specific written approval of the Engineer and the State Commissioner of Environmental Protection, to a storm sewer or natural outlet.
(Ord. 235, adopted 9-4-84) Penalty, see § 51.99
Except as hereinafter provided, no person shall discharge or cause to be discharged into the public sewer or natural outlet any of the following.
(A) Any gasoline, kerosene, alcohol, formaldehyde, disinfectants, benzene, naphtha, fuel oil, or any flammable or explosive liquid solid or gas.
(B) Any waters or wastes containing toxic, poisonous, or radioactive 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. Material, such as copper, zinc, chromium, and similar toxic substances, shall not be allowed in soluble form or in suspended solid form in concentration higher than those achieved in appropriate pretreatment facilities approved by the Engineer and the Commissioner of Environmental Protection.
(C) Any sewage having a pH lower than 5.5 or higher than 9.00, and having any other corrosive property capable of causing damage or hazard to the public sewer or its personnel.
(D) Solid and 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, paint, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails, and paper dishes, cups, milk containers, and so forth, either whole or ground by garbage grinders.
(E) Any liquid or vapor having a temperature higher than 120°F. (49°C.) except by written approval of the Engineer. In such cases, the Engineer may require installation, by the industry, of an approved temperature recorder in the receiving sewer.
(F) Any water or waste containing fats, wax, grease, or oils in excess of 50 mg/l for emulsified material and 15 mg/l for free floating material, or containing substances which may solidify or become viscous at temperatures between 32°F. and 150°F. (0° and 65°C.)
(G) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower or greater shall be subject to the review and approval of the Engineer.
(H) Any sewage containing suspended solids in excess of 350 parts per million by weight or having a B.O.D. in excess of 300 parts per million by weight.
(I) Any waters or wastes containing phenols or other taste or odor producing substances in such concentrations exceeding limits which may be established by the Engineer as necessary, after treatment of the composite sewage, to meet the requirements of the state, federal, or other public agencies of jurisdiction for such discharge to the receiving waters.
(J) Materials which exert or cause:
(1) Unusual concentrations of inert suspended solids, such as, but not 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 B.O.D., 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 in § 51.02.
(5) High hydrogen sulfide content.
(K) Any substance which is not amenable to treatment or reduction by the wastewater treatment process employed, or is amenable to treatment only to such degree that the wastewater treatment plant cannot meet the requirement of other agencies having jurisdiction over discharge to the receiving waters without first pretreating to a concentration acceptable to the town.
(L) Any overflow or drainage from cesspools or other receptacles storing or constructed to store organic wastes.
(M) Cyanides or cyanogen compounds capable of liberating hydrocyanic gas or acidification in excess of one mg/l as CN in the wastes from any outlet into the public sewers.
(N) Radioactive materials exceeding the existing standards of the State, Department of Environmental Protection, or the United States Environmental Protection Agency.
(O) Any wastewaters containing phenols or other taste producing substances in such concentrations as to produce odor or taste in the effluent as to affect the taste and odor of the receiving waters.
(Ord. 235, adopted 9-4-84) Penalty, see § 51.99
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