New sanitary sewers and all extensions to sanitary sewers owned
and operated by the Gananda Sewer District shall be designed by a
professional licensed to practice sewer design in the state and in
accordance with the Recommended Standards for Sewage Works, as adopted
by the Great Lakes - Upper Mississippi River Board of State Sanitary
Engineers (Ten State Standards), and in strict conformance with all
requirements of the New York State Department of Environmental Conservation
(NYSDEC). Plans and specifications shall be submitted to and written
approval shall be obtained from the Superintendent, the Town Planning
Board and the NYSDEC before initiating any construction. The design
shall anticipate and allow for flows from all possible future extensions
or developments within the immediate drainage area.
When a property owner, builder or developer proposes to construct sanitary sewers or extensions to sanitary sewers in an area proposed for development, the plans, specifications and method of installation shall be subject to the approval of the Town Planning Board in accordance with §
235-24. The cost of installation of on-premises facilities, such as intercepting or trunk sewers, pumping stations and force mains, shall be paid by the said property owner, builder or developer. Each street lateral shall be installed and inspected pursuant to Article
VI, and inspection fees shall be paid by the applicant prior to initiating construction. Design and installation of sewers shall be as specified in §§
235-27 through
235-30, and in conformance with Paragraphs 3 through 6 of ASTM Specification C-12. The installation of the sewer shall be subject to periodic inspection by the Superintendent, without prior notice. The Superintendent shall determine whether the work is proceeding in accordance with the approved plans and specifications and whether the completed work will conform with the approved plans and specifications. The sewer, as constructed, must pass the infiltration test (or the exfiltration test, with prior approval), according to the design standards as required by Chapter
190, Land Use and Public Works, before any building lateral is connected thereto. The Superintendent shall be notified 30 days in advance of the start of any construction actions so that such inspection frequencies and procedures as may be necessary or required may be established. No new sanitary sewers will be accepted by the Town Board until such construction inspections have been made so as to assure the Town Board of compliance with this chapter and any amendments or additions thereto. The Superintendent has the authority to require such excavation as necessary to inspect any installed facilities if the facilities were covered or otherwise backfilled before they were inspected so as to permit inspection of the construction. The Superintendent shall report all findings of inspections and tests to the Town Board.
Plans, specifications and methods of installation shall conform to the requirements of this article. Components and materials of wastewater facilities not covered in this chapter, such as pumping stations, lift stations or force mains, shall be designed in accordance with §
235-24 and shall be clearly shown and detailed on the plans and specifications submitted for approval. Additional force main details are covered in §
235-37. When requested, the applicant shall submit, to the Superintendent and to the Town Planning Board, all design calculations and other pertinent data to supplement review of the plans and specifications. Results of manufacturer's tests on each lot of pipe delivered to the job site shall also be furnished, upon request.
All sanitary sewers or extensions to sanitary sewers, including
manholes, shall satisfy requirements of a final infiltration test
before they will be approved and wastewater flow permitted in the
Gananda Sewer District. The infiltration rate shall not exceed 25
gallons per 24 hours per mile per nominal diameter in inches. An exfiltration
test may be substituted for the infiltration test; the same rate shall
not be exceeded. The exfiltration test shall be performed by the applicant,
under the supervision of the Superintendent, who shall have the responsibility
for making proper and accurate measurements required. The exfiltration
test consists of filling the pipe with water to provide a head of
at least five feet above the top of the pipe or five feet above groundwater,
whichever is higher, at the highest point under test, and then measuring
the loss of water from the pipe section under test by the amount of
water which must be added to maintain the original level. In this
test, the test section must remain filled with water for at least
24 hours prior to taking any measurements. Exfiltration shall be measured
by the drop of water level in a standpipe with a closed bottom end
or in one of the sewer manholes serving the test section. When a standpipe
and plug arrangement is used in the upper manhole in the test section,
there shall be some positive method for releasing entrapped air prior
to taking any measurements.
The test section shall be as ordered or as approved, but in
no event longer than 1,000 feet. In the case of sewers laid on steep
grades, the test length may be limited by the maximum allowable internal
pressure on the pipe and joints at the lower end of the test section.
For purposes of determining the leakage rate of the test section,
manholes shall be considered as sections of forty-eight-inch-diameter
pipe, five feet long. The maximum allowable leakage rate for such
a section is 1.1 gallons per 24 hours. If leakage exceeds the allowable
rate, then necessary repairs or replacements shall be made and the
section retested.
The test period during which the test measurements are taken
shall not be less than two hours.
Prior to testing, the section shall be lamped. Any joint out
of straight alignment shall be realigned.
Also prior to testing, all plastic pipe in the test section
shall be tested for deflection. Deflection testing shall involve the
pulling of a ball whose diameter is 95% of the pipe's inside diameter
through the pipe. Any joint with a deflection greater than 5% shall
be replaced. The test section shall be flushed just prior to deflection
testing.
Force mains serving sewage lifting devices, such as grinder pumps and pump stations, shall be designed in accordance with §
235-24. Additional design requirements are:
A. Trenching, bedding and backfilling shall be in accordance with §
235-29.
B. Drain valves shall be placed at low points.
C. Automatic air relief valves shall be placed at high points and at
intervals of 400 feet, on level force main runs.
D. Air relief and drain valves shall be suitably protected from freezing.
E. When the daily average design detention time in the force main exceeds
20 minutes, the manhole and sewer line receiving the force main discharge
or the sewage shall be treated so that corrosion of the manhole and
the exiting line are prevented. The corrosion is caused by sulfuric
acid biochemically produced from hydrogen sulfide anaerobically produced
in the force main.
All sanitary sewers and extensions to sanitary sewers constructed
at the applicant's expense, after final approval and acceptance by
the Superintendent and concurrence by the Town Board, shall become
the property of the Town and shall thereafter be operated and maintained
by the Town. Said sewers, after their acceptance by the Town, shall
be guaranteed against defects in materials or workmanship for one
year by the applicant. The guaranty shall be in such form and contain
such provision as deemed necessary by the Town Board, secured by a
surety bond or such other security as the Town Board may approve.