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This work shall consist of construction or reconstruction of sanitary sewers and appurtenances in accordance with these Specifications and in reasonable close conformity with the lines, grades, dimensions, and locations shown on the Plans or established by the Engineer.
All materials shall meet the requirements of Division 10 shown below or as stated in the plans or project special provisions:
Sanitary Sewer Pipe and Fittings Section 1034
The Contractor shall submit to the Engineer catalog cuts and/or shop drawings for such materials as special fittings, lift stations, and manholes he proposes to use on the project. These shall be submitted by the Engineer to the State Design Services Engineer for review and approval. Forty days shall be allowed for the review of each submittal.
Materials which have not been approved shall not be delivered to the project. Eight (8) copies of each catalog cut and/or drawing shall be submitted and each shall show the material description, brand name, stock number, size, rating, manufacturing specification and the use for which it is intended.
1520-3 CONSTRUCTION REQUIREMENTS.
Sewer lines shall be laid true to lines and grades given.
The size, type, class and thickness or pressure rating of sewer line material shall be as shown on the utility plans and/or project special provisions.
Polyvinyl Chloride pipe shall have a gasketed joint used in conjunction with an integral bell which shall be a homogenous part of the pipe. PVC pipe joints shall be assembled in accordance with recommendations of the manufacturer and in accordance with the specifications.
PVC pipe shall have its location marked by using a detectable marking tape, installed 18 to 24 inches below finished grade. Such tape shall be approved by the Engineer.
PVC pipe shall be installed in accordance with approved bedding methods.
PVC sewer pipe 4" or larger shall require the use of Ductile Iron Sewer Pipe Fittings as noted elsewhere in these specifications.
All ductile iron sewer pipe shall be installed in accordance with laying condition Type "2" as stated in ANSI A21.50 (AWWA C151), unless otherwise shown on the plans.
All ductile iron force main sewer pipe shall be installed in accordance with laying condition Type "2" as stated in ANSI A21.50 (AWWA C150) unless otherwise shown on the plans.
Reinforced concrete sewer pipe shall be Class III, B wall pipe unless otherwise shown on the plans.
Ductile iron sewer pipe fittings and specials shall be installed in accordance with the applicable utility provisions herein and as shown on the utility plans and/or as directed by the Engineer.
Vitrified clay sewer pipe, (ABS) truss, and solid wall lateral sewer pipe shall be installed in accordance with the applicable utility provisions, as shown on the utility plans, and/or as directed by the Engineer.
(ABS) pipe shall be sufficient wall thickness and strength to withstand the various earth and impact loads that bear on the installed pipe.
Sanitary sewer clean-outs shall be installed in accordance with the applicable utility provisions, as shown on the utility plans and/or as directed by the Engineer. Clean-outs shall be 4 inch minimum in diameter and have screw type covers installed flush with the ground or approved by the Engineer.
During the progress of the work and until the completion and final acceptance, the pipelines and their appurtenances shall be kept clean throughout. Any obstructions or deposits shall be removed.
If, at any time before completion of the contract, any broken pipe or any defects are found in the lines or in any of their fittings or appurtenances, they shall be carefully examined for defects before placing, and any found defective shall not be used.
When work is not in progress, open ends of pipe, fittings, and valves shall be securely closed so that water, earth, or other foreign substances can not enter.
The Contractor shall adjust manhole tops as required to provide access during all phases of construction. Final adjustment shall be flush with finish grade unless specified otherwise.
Final connections of the proposed sewer work to the existing system shall be made where indicated on the drawings, as required to fit the actual conditions, or as directed by the Engineer. The Contractor shall notify the owner at least 24 hours in advance of all arrangements for temporary service and for agreement with the owner as to the time that service may be interrupted.
1520-4 SEWER SYSTEM INSTALLATION.
(A) Pipe Installation:
Sewer lines shall be laid in trenches of adequate width to allow the proper installation of the line. Excavation trenching and backfill shall be done in accordance with Section 1505.
The bottom of the trench shall be shaped to give substantially uniform circumferential support to the lower fourth of each pipe. Pipe laying shall proceed upgrade with the spigot ends pointing in the direction of flow. Each pipe shall be laid in such manner as necessary to form a close concentric joint with the adjoining pipe and to prevent sudden offsets of the flow line. As the work progresses, the interior of the sewer shall be cleared of all foreign materials. Where cleaning after laying is difficult because of small pipe size, a suitable swab or drag shall be kept in the pipe and pulled forward past each joint immediately after the jointing has been completed. Trenches shall be kept free from water until backfilled and pipe shall not be laid when the condition of the trench or the weather is unsuitable for such work.
Any fittings or saddles necessary to connect service lines to the sewer main will be considered incidental to the pipe.
The Contractor shall do all that is necessary, including temporary pumping, in order to keep all existing sewers active for either the duration of this contract or until the Engineer authorizes connections.
(B) Sewer Line Testing:
(1) General
All new sewer lines shall be tested for watertightness. Leakage into the sewer lines shall not exceed 100 gallons per inch diameter per mile of pipe per 24 hours for any section of the line between adjoining manholes and 100 gallons per inch diameter per mile of pipe per 24 hours for any line, or system of lines, extending through two or more manholes. When determination of infiltration is not practicable because of dry trench conditions, exfiltration tests shall be made if, as and where directed. The tests shall be made by filling the sewer between successive manholes with water to the top of the outlets of the upper manhole. The amount of water required to maintain the pipe full for the required test period shall be measured and the rate of leakage determined. When the leakage exceeds the specified amount, satisfactory correction shall be made. Both the test and the correction shall be made by the Contractor.
In lieu of hydrostatic testing, sewer lines 24 inch diameter or smaller may be air tested in accordance with ASTM C828, ASTM C924 and the following. Such tests shall consist of securely plugging the sewer line between manholes, pumping the section full of air to 4.0 psi and holding this pressure for 5 minutes. Then the pressure should be reduced to 3.5 psi and the time recorded for the pressure to drop 1.0 psi to the new pressure of 2.5 psi. The time shall exceed the minimum test time given in the chart below for test times per 100 feet for the appropriate nominal pipe diameter.
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Sewer lines larger than 24 inch shall be visually inspected from the inside. Any leakage or rolled gaskets or defects shall be corrected.
(2) Force Main Sewers
All new sewer force mains shall be hydrostatically tested at 200 psi. The pipeline should be filled slowly and care should be exercised to vent all high points and expel all air. Vents should remain open until water flows from them at a steady flow. In addition, all fittings should be properly anchored before the test is made. After the air is expelled from the line, pressure should be applied by means of a hand pump, a gasoline pump, or some type pumping equipment approved by the Engineer.
After the main has been brought up to the required pressure, the test shall be held for a period of 2 hours, and the make-up water measured with a displacement meter or by pumping the water from a vessel of known volume as approved by the Engineer. If possible, the pipe and joints should be inspected thoroughly while under test pressure, and any leak or excessive moisture at the joints should be corrected. No piping installation will be accepted until the leakage is less than the number of gallons per hour as determined by the formula W = 0.000106 LD in which W equals the allowable leakage in gallons per hour; L is the length of pipe tested; and D is the nominal diameter of the pipe, in inches. Should test of any pipe laid disclose leakage greater than that specified above, the defective joints shall be repaired until the leakage is within the specified amount.
The quantity of sewer lines of the various sizes and types which has been incorporated into the completed and accepted work will be measured from end to end by the linear foot in place with no deduction for length through manholes. Where two different sizes enter or go from a manhole, each size will be measured to the center of the manhole. Unless otherwise shown on the plans, branch connections, ells, or other fixtures will be included in the length measurement.
The quantity of ductile iron sewer pipe fittings will be measured based on the published weights for ductile iron fittings listed in ANSI/AWWA C110/A21.10 exclusive of the weights of any accessories. If the Contractor elects to use compact ductile iron sewer pipe fittings, measurement shall be based on the weight of standard size ductile iron water pipe fittings as published in ANSI A21.10. No measurement of the accessories will be made as the accessories are considered incidental to other work being paid for by the various items in the contract.
The quantity of the sanitary sewer cleanouts will be measured by the actual number of each of these incorporated into the completed and accepted work.
The quantities of sewer line measured as provided in Article 15205, will be paid for at the contract unit prices per linear foot for each size and type shown below.
The quantity of ductile pipe fittings, installed in accordance with the plans and provisions herein and accepted, will be measured and paid for at the contract unit price per pound (based on the published weights for ductile iron fittings).
The quantity of sanitary sewer clean-outs, installed in accordance with the plans and utility provisions and accepted, will be paid for at the contract unit price for each.
The above prices and payments will be full compensation for furnishing and installing all materials, including pipe, accessories, fittings, compression couplings, detectable marking tape, anchoring, connections, pressure test, leak test, excavation, backfilling, compaction and incidentals necessary to complete the work as required.
Payment will be made under:
______ inch PVC Sewer Pipe SDR _____ _____ Linear Foot
______ inch PVC Force Main Sewer Pipe
SDR ______ ______ # WP Linear Foot
______ inch DI Sewer Pipe, Class ______ Linear Foot
______ inch DI Sewer Pipe, PC ______ Linear Foot
______ inch DI Force Main Sewer Pipe, Class______,______# WP Linear Foot
______ inch DI Force Main Sewer Pipe, PC______ Linear Foot
Ductile iron sewer pipe fittings, 250 # Min. WP Pound
______ inch R.C. Sewer Pipe, Class______ Linear Foot
______ inch VC Sewer Pipe, ______ inch ABS Truss Sewer Pipe Linear Foot
______ inch ABS Solid Wall Lateral Sewer Pipe SDR, Linear Foot
Sanitary Sewer Cleanout Each