(A) Design and installation costs. Except where noted in this subchapter, the developer shall be responsible for payment of all expenses related to design, permitting, licensing, installation, testing and certification of the sanitary sewer system.
(B) Sanitary sewer main extension policy. Each sanitary sewer main extension shall be installed across the entire frontage and to the most distant property line of the properties to be served in order to permit future extensions of the main to additional properties beyond those currently proposed to be served. The Town Council may modify or waive this requirement upon a finding that there is no potential for the main to be extended to additional properties.
(C) Minimum design standards. Each wastewater collection system shall be designed and constructed by the developer in accordance with applicable federal, state and town regulations. Where specific guidance for the design of a proposed system is not provided in this subchapter or another town ordinance, or in any federal or state regulations, the standards in the most recent edition of the Recommended Standards for Wastewater Facilities (“Ten States Standards”) shall be utilized.
(E) Minimum system requirements. The system shall be designed to accommodate the estimated wastewater requirements for the project to be served based on the estimate of a licensed professional engineer, which estimated requirements shall be approved by the Town Council.
(F) Additional system requirements. At its option, the Town Council may require the developer to install pipes and other components of greater capacity or different design in order to accommodate additional future users of the system. The town shall directly reimburse or enter into an agreement to reimburse the developer for the additional cost of the materials required to facilitate the higher-capacity design. The difference in costs shall be based on the difference between the design engineer’s estimated cost for the materials required for the proposed system, and the design engineer’s estimated cost for the materials required for the higher-capacity system. The town will not pay additional engineering or installation costs.
(G) Design exceptions. Where the design engineer certifies that a particular element of a proposed design is equivalent to or superior to the requirements of this subchapter, the Town Council may, at its option, approve the proposed alternate design.
(H) Interconnection with other systems. There shall be no interconnection between the proposed wastewater collection system and any other system that conveys unpolluted waters or waters identified in § 52.26 of this chapter.
(I) Gravity and force main systems. Gravity mains shall be installed wherever the combination of slope and pipe cover satisfies the standards of the Ten States Standards. Pump stations and force mains will be installed only where gravity mains cannot be installed, and only for the minimum distance necessary to continue the project with a gravity main system.
(J) Service lateral restrictions. Service laterals shall be installed as nearly as possible at a 90-degree angle to the main into which the lateral is to connect. Where a sanitary sewer main can be extended and can then serve more than one property or can serve potential future development, service laterals shall not be permitted to cross other property, and shall not be installed along the length or run of an easement or right-of-way for access to a more distant sanitary sewer main instead of extending a sewer main to serve that property. The requirement to extend a main may be waived only upon a finding by the Town Council that the extended sewer main will have no potential for serving any existing or future users of the system, except the single lateral that is at present to be connected to the system. Under no circumstances may a service lateral be shared by separate structures, except as provided in §§ 52.25 through 52.34 of this chapter.
(K) Supplemental design requirements. The following requirements are supplemental to or supersede those in the Ten States Standards.
(1) Gravity pipes. All mains and laterals shall be a minimum of SDR 35 PVC pipe conforming to ASTM D-3034. All joints shall conform to ASTM D-3212. Mains shall be not less than eight-inch diameter. Service laterals shall be not less than six-inch diameter between the sanitary sewer main and the property line of the property served by the lateral, and not less than four-inch diameter between the property line and the structure being served.
(2) Force main pipes. All mains shall be a minimum of SDR 21 PVC pipe conforming to ASTM D-2241. All joints shall conform to ASTM D-3139. The diameter shall be consistent with the maximum projected capacity of the system as estimated by the design engineer and shall be approved by the Town Council.
(3) Infiltration. The maximum allowable ground water infiltration rate into the completed system shall not exceed 200 gallons per inch diameter of pipe per mile of pipe per day.
(4) Pump stations. Wherever a pump station is required in a collection system, the developer shall install a duplex pumping station with force main, electric service and all other devices required to adequately serve the design estimated load, and the pump station must comply with the following.
(a) The well shall be pre-cast concrete conforming to ASTM C-478.
(b) Pumps within a pump station shall be of the same model.
(c) Air release valves shall be installed at all high points in force mains between pump stations and between pump stations and manholes.
(d) Exterior surfaces of the well shall be coated with a bituminous water-proofing material. Where factory bituminous coating has been damaged, it shall be field repaired using the same material and in accordance with the manufacturer’s recommendations, prior to any backfilling operation.
(e) All buried force main pipes shall have a minimum of four feet of backfill cover.
(5) Manholes. All manholes shall comply with the following minimum requirements.
(a) Manholes shall be pre-cast concrete, not less than 48 inches in diameter with a 22-inch diameter access.
(b) Castings shall be watertight “Class A” type with a solid lid. Gray cast iron shall conform to ASTM A-48 and ductile cast iron shall conform to ASTM A-536.
(c) Pipe connectors shall be resilient type conforming to ASTM C-923 between the reinforced concrete manhole structure and all pipes into and/or out of the manhole.
(d) Joints shall be tongue-and-groove with flexible rubber gaskets conforming to ASTM C-443. “Cretex” or equivalent seals shall be installed between the manhole frame and the cone section where manholes are to be located in areas determined by the Town Council to be water-prone areas.
(e) Steps shall be approved cast-in-place non-corrosive fiberglass material conforming to ASTM A-48.
(f) Exterior surfaces shall be coated with a bituminous water-proofing material. Where factory bituminous coating has been damaged it shall be field repaired using the same material and in accordance with the manufacturer’s recommendations, prior to any backfilling operation.
(g) Lift holes in pre-cast sections shall be filled with non-shrinking concrete grout. When cured, grouted lift holes, casting grout and adjusting rings and grout shall be coated with bituminous water-proofing material to ensure a water-tight manhole structure.
(6) Clean-outs. On all service laterals that are more than ten feet long, the developer shall install clean-outs in the following locations: not more than five feet from the wall of the building where the service lateral exits the building; every 150 feet between the wall of the building and the sanitary sewer main; and at each 90-degree turn in the lateral.
(7) System testing. The developer shall conduct the following tests, which shall be witnessed by a representative of the town and by the developer’s engineer.
(a) System air testing shall be in accordance with ASTM F-1417 for plastic pipe.
(b) Manhole negative air pressure (vacuum) testing shall be in accordance with ASTM C-1244.
(c) Deflection testing shall be conducted not less than 30 days following completion of the installation using a “go/no-go” mandrel in accordance with the requirements in the Ten States Standards. Maximum deflection shall not exceed 5%. Any section of pipe not passing the deflection test shall be repaired or replaced, then retested 30 days or more after repair or replacement, and before acceptance of the project by the town.
(d) Hydrostatic testing of force mains shall be in accordance with state regulations.
(8) Service lateral markers. The developer shall mark the location of each service lateral at the property line using a one-inch diameter PVC pipe set vertically and painted green.
(9) Tracing wire. Tracing wire shall be installed along all non-metallic force mains.
(Ord. 2002-01, passed 10-7-2002)