New sanitary sewers and all extensions to sanitary sewers owned and
operated by the town shall be designed, by a professional licensed to practice
sewer design in the state, 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 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.
Plans, specifications and methods of installation shall conform to the requirements of this Part
2. Components and materials of wastewater facilities not covered in this Part
2, such as pumping stations, lift stations or force mains, shall be designed in accordance with §
132-27 and shall be clearly shown and detailed on the plans and specifications submitted for approval. Additional force main details are covered in §
132-40. 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 by the town. 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 the 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 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 §
132-27. Additional design requirements are:
A. Trenching, bedding and backfilling shall be in accordance with §
132-32.
B. Drain valves shall be placed at low points.
C. Automatic air-relief valves shall be placed at high points
and at four-hundred-foot intervals, 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.