P.I.N. XXXX.XX SPECIAL NOTES
SANITARY SEWER NOTES
DESCRIPTION:
The work shall consist of constructing or altering sanitary sewer facilities as shown on the Plans or as ordered by the Engineer. Where "AWWA" or "ANSI" specifications are noted, the most recent revision of that specification shall apply.
MATERIALS:
1. Ductile Iron Pipe. The pipe used shall be ductile iron, centrifugally cast pipe conforming with ANSI A21.51 (AWWA C151). The pipe shall be class thickness 52.
Fittings shall conform with ANSI A21.10 (AWWA C110). All pipe and fittings shall be lined with cement-mortar on the inside and shall have a petroleum asphaltic coating on the outside. The cement-mortar lining shall conform with ANSI A21.4 (AWWA C104). The thickness of the lining shall be double the standard thickness required by this specification.
Pipe and fitting joints shall be rubber-gasket joints (either the mechanical type or the push-on type) and shall conform with ANSI A21.11 (AWWA C111).
2. Polyvinyl Chloride Pipe (PVC). The pipe and fittings furnished shall meet the requirements of ASTM D- 3034 (gravity sewer and service laterals) and ASTM D- 2241-84 (sewage force mains). The pipe shall beof the size, SDR classification and pressure rating as shown on the Plans.
All joints shall be the push-on type constructed with a lock in, elastomeric seal to provide a tight flexible seal. The elastomeric seal shall meet the requirements of ASTM F-477 X 76 (1981).
The lubricant used for assembly shall have no detrimental effect on the gasket or on the pipe.
Wyes and tees for gravity sewers shall meet the requirements of ASTM D-3034-83 and be the fitting type.
3. Acrylonitrile-Butadiene-Styrene (ABS). ABS sewer pipe shall conform to the following requirements:
4 and 6 NPS - ASTM D2751 and shall be SDR 23.5
8, 10, 12 and 15 NPS - AASHTO M264
The following are the requirements of the owner of the sewer system for this contract:
MUNICIPALITY: ______
ADDRESS: ____________
CITY, STATE, ZIP: ______
PHONE #: ______
CONTACTS
SEWER DEPT.:______
SEWER SYSTEM
PIPE:
TYPE OF MATERIAL:______
CLASS OR SDR#:______
TYPE OF JOINT:______
SPECIAL REQUIREMENTS: ______
FITTINGS
DUCTILE IRON PIPE:
C153 COMPACT DI PERMITTED FOR SIZE TO ______
C110 FULL BODY DI PERMITTED FOR SIZE TO ______
POLYVINYL CHLORIDE PIPE (PVC):
SDR 35 SIZE TO ______
ACRYLONITRILE-BUTADIENE-STYRENE (ABS):
SIZE TO ______
MANHOLES
PREFERRED PRECAST ______PREFERRED CAST-IN-PLACE ______
DEPTH OF BURY ON MAIN ______MINIMUM SEWER SIZE ______
WALL THICKNESS:
CAST-IN-PLACE 200 mm MINIMUM ______PRECAST - ASTM C-478 ______
COVERS:
PREFERRED MANUFACTURER ______
NAME OF SEWER DISTRICT REQUIRED ON COVER YES NO
TYPES OF CONNECTIONS
DUCTILE IRON PIPE ______
POLYVINYL CHLORIDE PIPE ______
ACRYLONITRILE-BUTADIENE-STYRENE ______
SPECIAL PROVISIONS: (Polyethylene encasement on ductile iron pipe etc.)
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CONSTRUCTION DETAILS:
A. General. All work shall be done in accordance with the Plans and the specifications, and shall besatisfactory to the Engineer and the owners of the sanitary sewer system.
The contractor shall make all necessary arrangements, obtain all permits, and pay all charges as required to satisfy the requirements and regulations of the owner of the local sewer department.
Prior to the start of work, the Contractor shall prepare and submit for approval to the Engineer, schedules of the proposed sequence of work, and drawings or catalog cuts of the sewer pipes and appurtenances comprising the work.
When the new sewer is to replace an existing main in the same location, the Contractor shall be responsible to make whatever arrangements necessary to maintain the sewer flows around the work area.
This will include, but not be limited to, plugging portions of manholes, use of pumps, by-pass pipes and discharge sections, maintenance and protection of traffic on side streets and driveways. Any by-pass system must satisfy the requirements of the local Health Department and be submitted to the Engineer for approval prior to start of work.
Damage to existing facilities due to the Contractor's operations shall be repaired or replaced at the Contractor's expense.
B. Service Connections. The Contractor shall dye test facilities in all existing buildings to determine what sanitary connections will be hooked up. It will be assumed that at least
one service will be provided perbuilding. The Contractor will be responsibleto maintain service at all times, except during actual reconnection, in which casethe occupant shall have received 24 hours prior notification.
C. Excavation and Backfill. Installation details and payment lines shall be as shown on Standard SheetM203-4 except as follows:
1. The top payment line for excavation shall be the ground surface.
2. The width of trench excavation for pipe diameters less than 12 NPS shall be the actual bottom width necessary, as determined by the Engineer, to properly perform the installation work required, or 900 mm, whichever is less.
D. Lines and Grades. Subsection 603-3 of the Standard Specifications shall apply.
In addition, pipes shall be laid so that the centers form a straight line parallel to the required grade.
Horizontal and vertical separation of sewer and water mains shall be as mandated by the local Health Department regulations.
E. Pipe Installation. Excess coating, blisters, etc., shall be removed from the bell and spigot end of eachpipe and the outside of the spigot and the inside of the bell shall be wire brushed and wiped clean and drybefore the pipe is laid.
Every precaution shall be taken to prevent foreign material from entering the pipe while it is being placed. All pipe connections shall be made in the trench. No joining of pipes will be allowed before lowering and setting in the trench. Pipe shall be placed with bell ends facing in the direction of laying. The spigot end shall be centered in the bell and the pipe forced home and brought to correct line and grade.
F. Infiltration and Exfiltration Tests (Gravity Sewers). The Engineer may call for infiltration or exfiltrationtests anytime on any section of pipe.
The Contractor shall, as ordered by the Engineer, test and sewer pipe for leakage by internal water pressure (exfiltration test). The Contractor shall furnish and install temporary plugs or stoppers at appropriate intervals along the line, together with suitable riser pipes where manholes cannot be used. When the test is to be made, the pipe, manholes or riser shall be filled with water to a level of 1.5 m above the highest point of the crown of the sewer or the groundwater level, whichever is greater, and allowed to stand at that head for not less than four hours. The rate of exfiltration during the test shall be recorded by measuring the volume of water used to restore the water level to its original level in the manhole or riser. The level shall be maintained, in general, at all times during the test.
When directed by the Engineer, the Contractor shall test the sewer for infiltration of groundwater. Infiltration testing shall be made only when the existing groundwater level is at least 600 mm above the highest point of the crown of the sewer. The Contractor shall:
1. Provide calibrated weirs.
2. Provide and set temporary stoppers, with small pipes, to measure water flow.
3. Provide any other means of measurement as required.
4. Furnish labor to assist the Engineer in testing.
The existing groundwater level shall be determined by direct measurements using an observation well pipe which is placed in the trench prior to backfilling. The observation pipe shall be installed with the lower end embedded in the sewer foundation gravel, at or below the sewer invert, and the upper end at or above the finished grade. The cost of these tests shall be included in the price bid for sanitary sewer pipes.
Any sewers not in compliance with the maximum allowable infiltration or exfiltration rate shall be corrected by the Contractor, at no additional cost to the owner, until the requirements are met or approved by the Engineer.
Unless otherwise specified by the owner, infiltration/exfiltration testing will not be required in those sections of the sanitary sewer where, in order to maintain existing flows, live lateral sewer connections must be made thereto prior to the completion of the length of sanitary sewer between manholes.
If a section of pipeline fails to pass the infiltration/exfiltration test, the Engineer shall require the Contractor to inspect the line, including closed circuit TV, to isolate the source of leakage. Once the source of the problem is found, the Contractor shall repair the section and remeasure the flow (or retest with closed circuit TV where appropriate). If the flow still exceeds the maximum rate, further corrective measures shall be taken to reduce the infiltration to within allowable limits. The above corrective measures shall be made by the Contractor at no additional cost to the owner. Temporary stoppers and testing facilities shall be removed after the testing has been completed and the sewer restored to good order.
G. Testing Piping Systems - Sewage Force Mains. The completed sewage force main including valves,fittings, connections to pump and other pipeline systems shall be tested for leakage and the successful testshall be one criteria for payment to the Contractor.
The tests will be conducted as directed by the Engineer, but the Contractor shall furnish all necessary labor, equipment, water and materials necessary for conducting the tests as specified.
The system shall be pressurized to 1.5 times the pipe working pressure or 690 kPa, whichever is greater, at the point of testing. After this pressure, ± 35 kPa, leakage test shall be performed for a period of no less than 2 hours. Hydrostatic tests shall be performed, and successful test results derived in accordance with AWWA C-600-77, Section 4. If the leakage in the system exceeds the specified amount, the Contractor shall, at no added cost to the Owner, make any repairs or replacements necessary to reduce the leakage to the required limits and retest the system.
MEASUREMENT AND PAYMENT:
Unless otherwise specified, the contract prices shall include the furnishing of all labor, material and equipment required to complete the work. No separate payment will be made for the temporary supporting of existing mains or other utilities encountered, permits, hauling, loading, storing and temporary bulkheads, but the costs shall be included in the contract prices for the various items.
Unless otherwise specified, excavation and backfill will be paid for separately under item 206.02M, Trench and Culvert Excavation and item 203.07M, Select Granular Fill, respectively.
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