All sanitary extensions to the sanitary or combined sewer system owned and maintained by the Town and/or district shall be properly designed in accordance with the Recommended Standards for Sewage Works, as adopted by the Great Lakes-Upper Mississippi River Board of State Sanitary Engineers (1968) and in strict conformance with all requirements of the New York State Department of Environmental Conservation. Plans and specifications for sewer extensions shall be submitted to and approval obtained from the Commissioner, the New York State Department of Environmental Conservation and Rensselaer County Department of Health before construction may proceed. The design of sewers must anticipate and allow for flows from all possible future extensions or development within the immediate drainage area.[1]
If the Town does not elect to construct a sewer extension under public contract, the property owner, builder or developer may construct the necessary sewer extension if this extension is approved by the Town Board in accordance with the requirements of § 43-27. The property owner, builder or developer must pay for the entire installation, including all expenses incidental thereto, and shall post a bond, in amount and form satisfactory to the Town, guaranteeing such payment. Each building sewer installed must be installed and inspected as previously required, and the inspection fees shall be paid. Design of sewers shall be as specified in § 43-29. The installation of the sewer extension must be subject to inspection by the Commissioner or his representative and the expense for this inspection shall be paid for by the owner, builder or developer. The Commissioner's decisions shall be final in matters of quality and methods of construction. The sewer, as constructed, must pass the exfiltration test required in § 43-30 before any building sewer is connected thereto. The entire cost of the sewer extension thus made shall be absorbed by the developers or benefiting property owners.
[Amended 3-20-2019 by L.L. No. 1-2019]
A.
The piping material selected should be adapted to local conditions such as character of wastes, possibility of septicity, soil characteristics, exceptionally heavy external loadings, and abrasion. Maximum benefit can usually be achieved with non-metallic materials such as polyethylene, fiberglass reinforced plastic (FRP), and PVC. Other acceptable pipe materials are ABS (acrylonitrile butadiene styrene), concrete, ductile iron and fiberglass/polyester composite. Sewer pipe materials such as vitrified clay, bituminous fiber (commonly known as Orangeburg), asbestos cement, steel, cast iron, and other metals which are typically found in older systems, should not be used in the design of new systems. See New York State Department of Environmental Conservation Design Standards Intermediate Sized Wastewater Treatment Systems, latest edition. Relevant ASTM standards include:
(1)
ASTM D1785 for Schedule 40, 80 and 120 pipe.
(2)
ASTM D2729 for polyvinyl chloride sewer pipe and fittings.
(3)
ASTM D2852 for styrene rubber plastic drain pipe.
(4)
ASTM D3034 for PSM polyvinyl chloride sewer pipe and fittings.
Pipe Diameter (inches) | Trench Width |
|---|---|
8 | 3 feet 3 inches |
10 | 3 feet 6 inches |
12 | 3 feet 9 inches |
B.
Pipe shall be firmly and uniformly embedded. Acceptable bedding material shall be used in the backfill of the area around the diameter of the pipe. A copper tracer wire will be installed 12 inches directly above the center of the pipe and detectable underground sewer caution tape will be installed above the tracer wire. Special bedding materials as designated by the Commissioner shall be used wherever, in his opinion, special bedding is required. Pipe thickness and field strength shall be calculated on the following criteria:
C.
Design shall be made in accordance with New York State Department of Environmental Conservation Design Standards Intermediate Sized Wastewater Treatment Systems, latest edition.
D.
Manholes shall be constructed at every change in size, slope and direction, at all line endings and intersections, at every 400 feet. The manholes shall be constructed with a poured three-thousand-pounds-per-square-inch-concrete base, steel-troweled-concrete bench walls and channels, precast four-foot-diameter concrete manhole barrel sections and an offset tapered top section for sewers less than eight feet in depth. The manhole frame and cover shall be the standard design of the district and shall be set with a traffic-rated expanded polypropelene riser to match final elevation. The riser shall meet or exceed the standards of AASHTO M306, ASTM C1244, ASTM C969, ASTM D4819-13 and SAE J1885. The use of any other materials are to be approved in advance by the Commissioner of Public Works.
E.
Tracer wire and marking tape will be installed on laterals 12 inches directly above the pipe.
A.
The gravity sanitary sewer mains and laterals will be air pressure tested at 4.0 psi for five minutes (ASTM F1417 or latest revision). Pipe sections to be tested include lengths between manholes or subsections to determine the locations of possible leaks. Sanitary sewers shall be tested after all storm drainage and water mains and laterals have been installed. The gauge must have a minimum of 0.5-pound increments. Allowable infiltration or exfiltration through manhole walls and pipe joints shall not exceed 100 gallons per miles of pipe per inch of diameter per 24 hours. Force main/grinder pump sanitary sewer mains shall be tested with water at 1 1/2 times the maximum working pressure or at least 40 psi for one hour. The gauge must have a minimum of five-pound increments. A Town representative must witness all tests.
[Amended 3-20-2019 by L.L. No. 1-2019]
B.
When a standpipe-and-plug arrangement is used in the upper manhole of a line under test, there must be some positive method of releasing entrapped air in the sewer prior to taking measurements. The test length intervals for either type of test shall be as ordered or approved, but in no event shall they exceed 1,000 feet. In the case of sewers laid on steep grades, the length of line to be tested by exfiltration at any one time shall be limited by the maximum allowable internal pressure on the pipe and joints at the lower end of the line. The test period, wherein the measurements are taken, shall not be less than two hours in either type of test.
C.
The total leakage of any section tested shall not exceed the rate of 100 gallons per mile of pipe per 24 hours per inch of nominal pipe diameter. For purposes of determining the maximum allowable leakage, manholes shall be considered as a section of forty-eight-inch-diameter pipe, five feet long. The equivalent leakage allowance shall be 4.5 gallons per manhole per 24 hours for forty-eight-inch-diameter manholes. If leakage exceeds the specified amount, the necessary repairs or replacements required shall be made to permanently reduce the leakage to within the specified limit, and the tests shall be repeated until the leakage requirement is met.
All sewer extensions constructed at the property owner's, builder's or developer's expense, after final approval by the Commissioner and acceptance by the Town Board, shall become the property of the district and shall thereafter be maintained by the district. Said sewer extensions, after their acceptance by the district, shall be guaranteed for one year by the builder or developer. The guaranty shall be in such form and contain such provisions as provided for by the district and Town. At the sole discretion of the district and/or Town, a completion bond or certified check may be demanded as part of the guaranty.
No owner, builder or developer shall be issued a building permit for a new dwelling or structure requiring sanitary facilities within the Town unless a suitable and approved method of waste disposal is proposed. All new housing or building developments within a district shall be provided with an approved system of sanitary sewers. No occupancy permit shall be issued until the waste disposal system has been completed and approved by the Commissioner.