641.01 Description.
640.04 Method of Measurement.
Each type of utility, either overhead or underground, to be adjusted and/or relocated for which direct payment is to be made will be designated on the plans or in the proposal. For the purpose of measurement and payment each type of utility will be classified separately. The method of measurement shall be as noted herein with meas urements either per linear foot {meter} or per lump sum with each being measured as complete in place. Measurements in linear feet {meters} will be to the nearest foot {0.1 m}, along the centerline of the type utility being measured.
640.05 Basis of Paymen t.
a.Unit Price Coverage . Payment for the utility adjustment, measured as noted above, will be made at the contract unit price bid per type utility which shall be payment in full for the adjustment as provided on the plans or proposal. Said contract unit price bid shall be payment in full for all materials, equipment, tools, labor and incidentals necessary to complete the adjustment of the utility and restore the service of the type utility involved. The unit price bid for underground utility adjustment w ill be based on placing the facility at a depth of 3 feet {1 m} or less under the existing ground surface, unless otherwise noted on the plans. The accepted footage of underground facilities complete in place at depths greater than 3 feet {1 m} below the g round surface shall have an adjusted unit price, arrived at by increasing the contract price bid by the percentage indicated in the table below. Unit price coverage noted in paragraph 1 above shall govern for such adjusted unit price. Final acceptance of t his work will be subject to approval by the Utility Company involved; therefore, the Engineer may withhold payment for this work until the Contractor has obtained the owner's written approval that the work performed complies with the local codes and requir ements of the Utility Company. Depth Utility Installed Below Existing Ground Line Percentage Contract Unit Price Bid to be Increased More than 3 feet {1 m}, but less than 6 feet {2 m} 20 6 feet {2 m} and more, but less then 9 feet {3 m} 50 9 feet {3 m} and more, but less than 12 feet {4 m} 75 12 feet {4 m} and more 100
b.Payment will be made under Item No .: 640-A * Utility Adjustment ( ** ) - per linear foot {meter} 640-B * Utility Adjustment ( ** ) - per lump sum * Overhead or Underground ** Electrical, Communication (Telephone/Telegraph), Gas, Water or Sewerage NOTE: Types of Utilities in general will be classified as Electrical, Communication (telephone or telegraph), Gas, Water or Sewerage. WATER LINE
641.01 Description.
This Section shall cover the work of the following: • furnishing and installing new water pipe, water mains, water meters and boxes, valves and valve boxes, fire hydrants, and appurtenances; • removing, relaying and reset ting existing water pipe, water mains, water meters and boxes, valves and valve boxes, fire hydrants, and appurtenances; • constructing connections to existing water mains. A water service line shall be defined as a lateral line leading from a water main to a building. A water main shall be defined as the carrier pipe through which water is transmitted from the water source to the water service lines.
641.02 Materials.
All work performed and materials used shall be in accordance with the ALDOT plans and specifications and th e Utility’s requirements. In the event that there is a conflict between the ALDOT plans and specifications and the Utility’s requirements, the more stringent requirements shall govern.
641.02 Materials.
Materials furnished for use shall conform to the req uirements of Section 863 and other appropriate Sections of Division 800, Materials. Concrete used for thrust blocks shall be in accordance with the requirements given in Section 620.
641.03 Construction Requirements.
a.General .
1.Water Pipe . Pipe shal l be laid in the presence of the Engineer. Pipe shall not be covered until allowed by the Engineer. Pipe designated to be relaid that is damaged or rendered unfit for use through negligence or improper handling by the Contractor shall be replaced by the Co ntractor without additional compensation. All new pipes shall be handled in such a manner as to prevent damage to the pipe and pipe lining. The interior of all pipes, valves, and fittings shall be free from dirt and debris. All material shall be stored i n the appropriate manner to protect the materials from damage by freezing and subsequent handling. The construction methods employed in the adjustment, relocation, and placement of the water pipe shall be in accordance with the current codes and practices of the Utility Company involved. Work required for the adjustments of a water main and service line shall be performed by the Contractor in such a manner that shall limit interruption of the service for a minimum period of time. Notice shall be made by th e Contractor to the Customers affected by the service interruption at least 4 hours but not more than 72 hours prior to service interruption. When ductile iron water pipe and fittings are located in potentially corrosive soil conditions, the pipe shall be wrapped in polyethylene sheath meeting AWWA C105. When installing non- metallic water pipe, the Contractor shall install a metallic tape or locating wire on the pipe or provide other suitable means approved by the Engineer to allow for location by electroni c detection devices. Valves and other controls on the existing water system shall not be operated for any purpose by the Contractor without approval and representation by the Utility. Water mains shall be laid below existing drainage pipes, existing water lines, gas lines, and other utility lines except for sanitary sewer by deflecting pipe downward unless otherwise shown on the plans or approved by the Engineer. Any deflection shall be approved by the Engineer and in accordance with the pipe manufacturer’s recommendations. PVC pipe installation shall meet the requirements of ASTM D 2321. HDPE pipe used for the open cut method shall meet the manufacturer’s requirement for the pressure rating required for use.
2.Hydrant . All hydrants shall mee t the requirements of AWWA C502 and traffic model design. All hydrants shall be thoroughly cleaned of dirt or foreign matter before setting. Locations of hydrants will be determined by the Engineer. Hydrants shall be located for complete accessibility and to avoid damage from vehicles and injury to pedestrians. All hydrants shall stand plumb and shall have their nozzles parallel with or at right angles to the curb. Each hydrant shall be controlled by an independent gate valve. A drainage pit 2 feet x 2 feet x 2 feet {0.6 m x 0.6 m x 0.6 m} shall be excavated below each hydrant and filled with coarse gravel or crushed stone to a depth of 6 inches {150 mm} above the hydrant opening. The drainage pit shall not be connected to a sewer system. The bowl of each h ydrant shall be anchored as approved by the Engineer. Each fire hydrant unit shall include 3 feet of piping to attach to the water line. Fire Hydrant Extensions shall be installed to connect the standard fire hydrant unit as shown on the plans to the water line when the line is deeper than the standard 3 foot fire hydrant piping attachment.
3.Valves . All valves shall meet the requirements of AWWA C500. All valves shall close when the nut is turned clockwise. All valves shall have a non -rising stem.
641.03 Construction Requirements.
Gate v alves shall be plumb and shall be set and jointed to the new pipe as specified for laying pipe. Cast Iron valve boxes shall be plumb and centered over the wrench nut of the valve with the box cover flush with the finished pavement or unpaved area. Air rel ease valves shall be installed where shown on the plans.
4.Retainer Gland . Retainer glands shall be the type shown on the plans or designated by the Engineer and shall be installed in accordance with the Utility Company requirements.
5.Water Meter and Bo x Reset . The water meter box shall be adjusted carefully to the designated location and elevation. Backfill shall be tamped around each box located in the pavement area to the required density of the adjacent material. Any meter, box or accessories lost or rendered unfit for re- use due to negligence or improper handling by the Contractor shall be replaced in kind without additional compensation.
6.Valve Box Reset . A valve box shall not be reset until approved by the Engineer. The box shall be adjusted carefully to make sure that the top is at the designated location and elevation. Backfill shall be tamped around each box located in the pavement area to the required density of the adjacent material. Any box or accessories lost or rendered unfit for re -use due to negligence or improper handling by the Contractor shall be replaced in kind without additional compensation.
7.Line Stop. A line stop to stop the flow of water in a portion of the main without interruption of water service shall be manufactured and i nstalled by either T.D. Williamson, Inc., Severn Trent(Hydra -Stop), IPSCO, or an Engineer approved equal. The line stop and appurtenances shall be pressure rated for a minimum of 150 psi to safely cease the flow of water in the existing water main. The l ine stop shall be designed for the water main material shown on the plans and field verified prior to installation. The thrust restraint shall be as detailed in the project plans. The Contractor performing the installation of the line stop shall have suc cessful experience in water main tapping and line stopping.
b.Excavation and Foundation . The trench shall be excavated to the designated line and grade. The trench width shall be sufficient to permit work on the pipe and inspection of the work. Mains shall have a minimum trench width of 18 inches {460 mm} plus the outside diameter of the pipe with the depth sufficient to provide for foundation preparation and proper cover. Trenches shall be properly sheeted or braced wherever needed to prevent ca ve-in or loose soil from falling into the trench. Sides of the trenches shall be kept as near vertical as possible. Bell holes shall be excavated to insure that the pipe rests upon the bottom of the trench for its full length. In the event that the bottom of the trench is in rock or is unsuitable material, the trench shall be excavated at a minimum of 6 inches {150 mm} below grade or as directed by the Engineer. The trench shall then be backfilled with crushed stone as specified in Section 853 or Engineer a pproved material up to the proper grade elevation. All excavated material that is not suitable for use as backfill shall be removed from the project site or otherwise properly disposed. The trench shall be dewatered to prevent standing or running water, a nd to allow for proper installation of the water pipe.
c.Laying . The laying of pipe in finished trenches shall be started at the outlet end and shall be installed up grade with the spigot end pointing in the direction of flow. The pipe shall be laid to the line and grade shown on the project plans. The pipe shall then be examined to make sure that it is free of defects. Pipe shall be fitted and matched to form a smooth, uniform invert. The pipe shall be installed in accordance with the pipe manufacturer’s recommendations and as directed by the Engineer. Pipes shall be l owered so as to avoid damage and unnecessary handling in the trench. The hubs and bells shall be clean when laid. The pipe shall be cleaned of debris and dirt when jointing the pipe. The ends of the pipes shall be securely closed when laying is stopped for the night to prevent animals and water from entering the pipe. Water Mains shall have a minimum cover of 48 inches {1220 mm} under pavement and 36 inches {910 mm} under ditches. Reaction or thrust backing or other approved anchorage shall be provided on all mains 4 inches {100 mm} in diameter or larger at all wyes and tees, plugs, caps and at bends with a
641.03 Construction Requirements.
deflection angle equal to or greater than 22.5 degrees. Concrete for thrust blocks shall be placed against undisturbed earth. Walking and working on or o ver the completed water line, except as necessary for backfilling and tamping, shall not be permitted until at least 1 foot {0.3 m} of backfill is in place over the top of the pipe.
d.Joints . All joints shall be sealed for the entire circumference of the pipe providing an acceptable watertight joint. The installation of rubber or other type gasket joints shall be in accordance with the pipe manufacturer's recommendations and as directed by the Engineer. No joint shall be finished until the two next joints in advance have been placed. Any joint that is disturbed after jointing shall be removed, cleaned, and remade. Thermally fused joints shall be installed according to the pipe manufacturer’s recommendations. Where a restrained joint is required, locked mec hanical joint retainer glands or restrained joint gaskets of adequate strength to prevent movement of the water main shall be used in addition to the concrete thrust block.
e.Backfilling . Backfilling shall be performed immediately after inspection as dir ected by the Engineer to secure the pipe position prior to proceeding to the next section. The backfill material shall be carefully deposited equally on both sides of the pipe in uniform layers not to exceed 6 inches {150 mm} in compacted thickness to a density of not less than 95 percent of AASHTO T 99 maximum density. Backfill that is not under roadbeds shall be compacted as directed by the Engineer to be consistent with surrounding materials. Where roadways and other crossings are disturbed, the Contr actor shall restore them to their original condition and shall replace all surface material and all paving, sidewalks, sod, or other disturbed surfaces, by furnishing all necessary new materials without extra compensation. All pipe shall be pressure tested as noted in this Section before complete backfilling of the pipe will be permitted. All trenches and excavations shall be backfilled with approved natural soil unless shown otherwise on the plans. After completing the backfill, the Contractor shall promptly remove all surplus material, rubbish, and all equipment, leaving the site and adjacent areas in a neat and presentable condition.
f.Connection to Existing Water System . Connection to the existing water system shall be made as shown on the plans and as directed by the Engineer. The connection shall be made to minimize interruption of service. The Contractor shall notify the Utility at least 24 hours prior to connecting to the existing system.
g.Pressure Testing of Installed Lines .
1.General . All lin es installed under this Section shall be pressure tested as noted in this Subarticle and in accordance with AWWA C600. The Contractor shall have the option of testing the mains and service lines under one of the following conditions:
a.Lines uncovered.
b.Lines partially covered with joints and valves exposed. The cost for this work shall be included in the unit price bid for installing the water pipe.
2.Testing .
a.Water Mains. When a section of pipe is approved by the Engineer for testing, the Contractor shall furnish all materials, equipment, and labor to properly carry out the testing operation. This shall include, as a minimum, a test pump and a means of accurately measuring the volume of water necessary to maintain the required pressure duri ng the prescribed time of testing. A recording pressure gauge shall be used during the pressure test and the charts shall be provided to the Engineer and the Utility. The Contractor shall furnish, install, and remove any temporary bulkheads, flanges, and plugs, as well as corporation stops at high points in the pipe line and at the test pump, when such are necessary for the testing operation. Unless approved otherwise by the Engineer, all water mains, including corporation stops, shall be tested before ser vice lines are installed. If, in the opinion of the Engineer, the high pressure
641.04 Method of Measurement.
testing of the mains must be done after service lines are in place, the service lines shall be shut off at the corporation stops. After necessary joints, corporation stops, bul kheads, etc. have been installed, temporary corporation stops, if no other means can be provided, shall be placed in the high points of the pipe line and at the pumps as required, to remove air from the water system. The test pressure shall equal 150 perce nt of the working pressure, but not less than 100 psi {690 kPa} nor more than the pressure class of the pipe being tested. The minimum test period shall be six hours. However, the testing period shall be extended if the Engineer deems additional testing is necessary with no additional compensation given for the additional testing. The maximum leakage allowed shall be determined by the following formula: L = S D P1/2 / 133200 {L=S D P1/2 / 2816} L = allowable leakage in gallons/hour {liters/hour} S = length of pipe tested in feet {meters} P = test pressure in psig {bars} D = nominal diameter of the pipe in inches{inches} The Contractor shall provide suitable means for determining the quantity of water lost by leakage under the test pressure. When, in t he opinion of the Engineer, service lines cannot be shut off from the section to be tested or other conditions exist where pressure testing as described above may cause damage, the Engineer may approve that the line be tested under normal operating pressur e. The Contractor, at his expense, shall locate and repair defective joints, sections, or valves until the leakage is within the noted allowances. All observed leaks shall be repaired whether or not the leakage test results are within the requirements spec ified above. After the Contractor has made the necessary corrections, the main shall be retested as described above until the line passes the necessary requirements. All tests, and retests, shall be at the Contractor's expense.
b.Water Service Lines. These lines shall be checked under normal operating pressures for at least six hours and the line completely inspected for visible leaks unless checked along with the mains as noted in the preceding Subitem a. The Contractor, at his expense, shall locate and r epair or replace any connection or joint until leakage has been stopped.
h.Sterilization . Pipe lines and appurtenances, both existing and new, which are the responsibility of the Contractor by being within the overall limits of construction, shall be sterilized before being placed in service. The sterilization process shall be performed and accepted before all pressure tests have been performed to prevent contamination of the existing system. The sterilization process shall, as a minimum, be that required by the governmental regulatory body having jurisdiction over the utility. The Contractor shall contact the utility owner or regulatory body to determine the acceptable sterilization treatment. The cost for this work shall be included in the unit price bid for the water pipe installation.
i.Pigging . When the water main is 12 inches {300 mm} in diameter or greater, the main shall be pigged and then flushed at the scouring velocity. The cost for this work shall be included in the unit price bid for the wate r pipe installation.
641.04 Method of Measurement.
a.Water Main and Water Service Line . The actual accepted length of water main and water service line laid or relaid will be measured in linear feet {meters} along the center of the line, complete in plac e. Tees, wyes, crosses, bends and fittings will not be deducted from the measurement for payment along the center of the line being laid.
b.Fittings . Ductile Iron Fittings will be measured by the fitting’s weight in pounds {kg}. Bolts and other miscellaneous items will not be included in the measured weights. Payment will be based on the manufacturer’s catalog weight of the supplied fitting. PVC and HDPE fittings, where allowed, will not be measured separately for payment.
641.05 Basis of Payment.
c.Fire and Flush Hydr ants. Fire and flush hydrants will be measured individually as one complete unit.
d.Fire and Flush Hydrant Reset . Fire and flush hydrant resets will be measured individually as one complete unit requiring removal and replacement.
e.Fire Hydrant Extensions . Fire hydrant extensions will be measured in vertical feet {meters} along the vertical center of the water line.
f.Valve . Valves and valve box where shown on the plans, will be measured individually as one complete unit of the valve including a valve stem extension where required.
g.Concrete for Water Mains . Concrete for water mains will be measured per cubic yard {cubic meter} installed for water main plugs, supports, anchors, and thrust blocks. Payment will be based on the actual quantity placed f or the appropriate base and pipe size for normal soil conditions. Larger size blocks and payment based on larger concrete dimensions may be used when approved by the Engineer to accommodate poor soil conditions.
h.Retainer Gland . Retainer glands will be measured per each retainer gland required.
i.Anchor Tee . Anchor tees will be measured per each anchor tee required for fire hydrant installation.
j.Tapping Valve and Sleeve . Tapping valve and sleeves will be measured individually as one complete unit of the tapping valve and sleeve, valve stem extension where required, and valve box unit, including performing the tapping operation.
k.Service Tap . A service tap will be measured per each tap as a unit that includes the tapping sleeve, saddle, corporati on and curb stops, and couplings.
l.Water Meter and Box Set and Reset . A water meter and box set and reset will be measured as the number of each set or reset as shown on the plans and shall include the water meter, meter box and cover, all connections and pipe necessary to set or to remove and reset the water meter and box.
m.Valve Box Reset . A valve box reset will be measured per each box reset and shall include the resetting of the valve box and cover.
n.Line Stop. A line stop will be measured per each line stop as a unit that includes installation and maintenance of the line stop and the thrust restraint, the removal of the line stop and installation of a blind flange.
641.05 Basis of Payment.
a.Unit Price Coverage .
1.General . Final acceptance of this work shall be subject to approval by the Utility Company involved. Therefore, payment for this work will not be made until the Contractor has obtained the Owner's written approval that the work performed complies with the local codes and requirements of the Utility Company.
2.Water Main . The accepted quantity of water main laid or re- laid will be paid for at the contract unit price per linear foot {meter}, complete in place, which shall be payment in full for furnishing and install ing pipe; including joint material, polyethylene sheathing when required, fittings for PVC and HDPE pipe, restrained joint when specified, making necessary pipe connections, pigging, flushing, testing, excavating, backfilling, backfill material, and for al l other materials, tools, labor, equipment and incidentals necessary to complete the work.
641.05 Basis of Payment.
3.Water Service Line . The accepted quantity of water service line laid or re- laid will be paid for at the contract unit price per linear foot {meter}, complete in place, which shall be payment in full for furnishing and installing pipe; fittings for PVC pipe only, couplings, and joint material, excavating, backfilling, backfill material and for all other materials, tools, labor, equipment and incidentals necessary to complete the work.
4.Fittings . Ductile iron fittings will be paid for at the contract unit price for each pound {kg} of fittings specified on the project plans which shall be payment in full for all labor, materials, equipment and incidentals necessary t o furnish and install the size fitting required.
5.Fire and Flush Hydrant . Fire and flush hydrants will be paid for at the contract unit price and include all labor, materials, equipment and incidentals necessary to furnish and install one hydrant. Fire hydrants shall also include 3 feet {1 m} of piping to connect to the water line. Additional piping to connect to depths greater than 3 feet {1 m} will be paid as fire hydrant extension.
6.Fire and Flush Hydrant Reset . Fire and flush hydrant resets will be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to reset one hydrant complete in place including excavation, backfilling, resetting the fire hydrant and all necessary connections, v alves, and pipe. If any new fire hydrant extensions are required, they will be paid for under the appropriate pay item.
7.Fire Hydrant Extensions . Fire hydrant extensions will be paid for at the contract unit price per linear foot {meter} which shall be p ayment for all labor, materials, equipment and incidentals necessary to extend one fire hydrant unit to the required water line grade.
8.Valve . Valves will be paid for at the contract unit price which shall be payment for all labor, materials, equipment a nd incidentals necessary to furnish and install one valve, valve stem extension where required, and valve box as appropriate for the type of valve being installed.
9.Concrete for Water Mains . Concrete for water mains will be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and place the concrete.
10.Retainer Gland. Retainer glands will be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one retainer gland. Retainer Glands may be used in lieu of restrained joint pipe upon which payment will be for restrained joint pipe, not Retainer Glands.
11.Anchor Tee . Anchor tees will be pai d for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one anchor tee.
12.Tapping Valve and Sleeve. A tapping valve and sleeve for extending water service availability w ill be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one assembly of tapping valve and sleeve, valve stem extension where required, and valve box.
13.Service Tap. A service tap for providing water to a user will be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one service tap including the tapping sleeve, saddle, corporation and curb stops, and couplings.
14.Water Meter and Box Set and Reset. Water meter and box set and reset will be paid for at the respective contract price which shall include all labor, materials, equipment and incidentals necessary to set or t o remove and reset a water meter and box complete in place.
645.01 Description.
15.Valve Box Reset. Valve box reset will be paid for at the respective contract price which shall include all labor, materials, equipment and incidentals necessary to reset the box complete in place.
16.Line Stop. A line stop for stopping the flow of water in a portion of the main without interruption of water service will be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidenta ls necessary to install an utility approved line stop, install the adequate thrust restraint, maintenance of the line stop during construction, removal of the line stop and the installation of a blind flange at the bypass outlet upon completion of the wate r main construction.
b.Payment shall be made under Item No.: 641-A ___ inch {mm} * Water ** Laid ( *** ) - per linear foot {meter} 641-B ___ inch {mm} * Water ** Relaid (***) - per linear foot {meter} 641-C Ductile Iron Fittings – per po und {kg} 641-D Fire Hydrant – per each 641-E Fire Hydrant Reset – per each 641-F Fire Hydrant Extension – per linear foot {meter} 641-G Flush Hydrant – per each 641-H Flush Hydrant Reset – per each 641-I ___ inch {mm} Air Release Valve – per each 641-J ___ inch {mm} Gate Valve with Box – per each 641-K ___ inch {mm} Butterfly Valve with Box – per each 641-L Concrete for Water Mains (Thrust Blocks) – per cubic yard {cubic meter} 641-M ___ inch {mm} Retainer Gland – per each 641-N ___ inch {mm} x ___ inch {mm} Anchor Tee – per each 641-O ___ inch {mm} x ___ inch{mm} Tapping Valve and Sleeve – per each 641-P ___ inch {mm} Service Tap – per each 641-Q ___ inch {mm} Water Meter and Box Set – per each 641-R ___ inch {mm} Water Meter and Box Reset – per each 641-S Valve Box Reset - per each 641-T ___inch{mm} Line Stop – per each * Show Type of Pipe: Ductile Iron ( DI); PolyVinyl Chloride (PVC ); Polyethylene ( PE); High Density Polyethylene ( HDPE ); Crosslinked Polyethylene (PEX Type A); Copper . ** Designate One Type: Main or Service Line . *** Designate Restrained Joint if Required. SECTION 645 SANITARY SEWERS
645.01 Description.
This Section shall cover the work of the following: • furnishing and installing new sanitary sewers, force mains, and manholes • removing, replacing, and resetting existing sanitary sewers, force mains, and manholes • constructing connections to existing sewers and manholes All work performed and materials used shall be in accordance with ALDOT plans and specifications and the Utility’s requirements. In the event that there is a conflict between the ALDOT specifications and the Utility’s requirements, the more stringent requiremen t shall govern.
645.02 Materials.
Materials furnished for use shall conform to the requirements of Section 853 and other appropriate Sections of Division 800, Materials. The pipe strength shall be in accordance with the requirements of Section 853 unless otherwise noted by the project plans or determined by the actual laying conditions. Concrete used for construction of sanitary sewers, force main, and manholes shall be Class A concrete in accordance with the requirements given in Section 501.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 526–532 of 934.