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1999 Specs for Trench Excavation & Backfill 1999 Standard Utilities Specifications Page 1 I I I I I I I I I I I I I I I I I I I TABLE OF CONTENTS SECTION 2600 STANDARD SPECIFICATIONS FOR TRENCHEXCAVATION AND BACKFILL/SURFACE RESTORATION 2600.1 Description....................................................................................................3 2600.2 Materials........................................ ...............................................................3 A. Granular Materials.........................................................................................3 Al Granular Material Gradation Classifications ................................................3 Al Granular Material Use Designations... ...... ................... ............. ..... ............ ...4 B Piling...............................................................................................................4 C Insulation........................................................................................................4 D Geotextile Fabric .................... .... ................. ......... ............ ...............................4 2600.3 Construction Requirements. ........................... ......... ................. ..................5 A General Provisions..........................................................................................5 A 1 Maintenance of Traffic ............... ................. ................................................. 5 A2 Establishing Line and Grade. ...... .... ..... ............ ..... .......... .......... ..... ...............5 A3 Protection of Surface Structures..... .......... ........ .......... ................ ......... ...... ...6 A4 Interference of Underground Structures ................. ............... ...... ............ .....7 A5 Removal of Surface Improvements .......... ............ .......... ............. ..... .... ........ 8 A6 Temporary Service Measures.................... ...... ........... ........ ................... .......8 B Excavation and Preparation of Trench......... ........... .......... ............... ......... ......9 Bl Operational Limitations and Requirements ..................................................9 B2 Classification and Disposition of Materials. ............ ................................ ..... 9 B3 Excavation Limitations and Requirements...................................................l 0 B4 Sheeting and Bracing Excavations ............. ........ .............. .......... .... ....... ...... ..11 B5 Preparation and Maintenance of Foundations ...............................................12 C Non Open Cut Pipe Installation......... ..... ................. ........ .......... .................. ...13 C 1 Jacking/Boring.......................... ......................... .............. ...... ..................... ..13 C2 Directional Boring........ .......... ............................. ...................... ...... ....... ...... .14 D Placement of Insulation................................................................................ ..15 E Pipeline Backfilling Operatims ................... .............................. ........... ....... ...15 F Restoration of Surface Improvements ...............................................'..........,...17 F 1 Turf Restoration..................... ..................... ......... ................. ........ ............... .18 F2 Pavement Restoration. ............................... ,....................................... ..... ..... ..18 F3 Restoration of Miscellaneous Items ..............................................................19 G Maintenance and Final Cleanup ... .................................... .............. .............. ..19 1999 Standard Utilities Specifications Page 3 I I I I I I I I I I I I I I I I I I I 2600 STANDARD SPECIFICATIONS FOR TRENCH EXCAVATION & BACKFILL/SURFACE RESTORATION 2600.1 DESCRIPTION This work shall consist of the excavation, backfilling, and restoration of existing surface improvements for the purposes of installing new and/or relocating or adjusting existing underground utilities. Use of the term "Plans, Specifications and Special Provisions" within this specification shall be construed to mean those documents which compliment, modify, or clarify these specifications and are accepted as an enforceable component of the Contract or Contract Documents. All references to Mn/DOT Specifications shall mean the latest published edition of tre Minnesota Department of Transportation Standard Specifications for Construction, as modified by any Mn/DOT Supplemental Specification edition published prior to the date of advertisement for bids. All reference to other Specifications of AASHTO, ASTM, ANSI, A WW A, etc. shall mean the latest published edition available on the date of advertisement for bids. 2600.2 MATERIALS A Granular Materials Granular materials furnished for foundation, bedding, encasement, backfill, or other purposes as may be specified shall consist of any natural or synthetic mineral aggregate such as sand, gravel, crushed rock, crushed stone, or slag, that shall be so graded as to meet the gradation requirements specified herein for each particular use by the material manufacturer or as indicated in the Plans, Specifications, or Special Provisions.. Al Granular Material Gradation Classifications Granular materials furnished for use in Foundation, Bedding, Encasement, or Backfill construction shall conform to the following requirements: Foundation materials shall have 100 percent by weight passing the 1-1/2 inch sieve and a maximum of 10 percent by weight passing the No.4 sieve. Backfill materials shall consist of existing trench materials, except as otherwise specified in this specification or in the Special Provisions. Bedding and encasement materials for flexible pipe, where improved pipe foundation is not required, shall meet the requirements of MnlDOT Specification 3l49.2Bl, Grami1ar Borrow, except that 100 percent by weight shall pass the one-inch sieve. 1999 Standard Utilities Specifications Page 5 I I D Geotextile Fabric I Geotextile fabric shall meet the requirements ofMnlDOT Specification 3733 and be used as required by the Plans, Specifications, and Special Provisions. I I I I 2600.3 CONSTRUCTION REQUIREMENTS A General Provisions Al Maintenance of Traffic I Whenever work interferes with the flow of traffic along a roadway, the Contractor shall provide for traffic control and sig~ng and public safety in accordance with the provisions of the field manual of Temporary Control Zone Layouts of the Minnesota Manual of Uniform Traffic Control Devices and Mn/DOT Specifications 1404 and 1710, and the Special Provisions. Neither road closures nor detours shall be permitted unless specified in the Special Provisions or authorized by the Engineer. Where road closures or detours are permitted by the Engineer, the Engineer shall determine the appropriate agencies, boards, or departments the Contractor must notify prior to taking the action and the proper advance notice to be provided to each body. I I I I Compliance with this requirement shall not be construed to relieve the Contractor from the responsibility of notifying agencies or institutions whose services may be predicated upon a roadway being opened to traffic or whose services would be hindered if a roadway is closed to traffic. Such agenc ies or institutions shall include, but not be limited to, the police department, the fire department, municipal bus service, school bus service, and ambulance service. The Contractor shall keep the required agencies informed of changing traffic patterns ani detour situations. A2 Establishing Line and Grade I I I I The primary line and grade will be established by the Engineer. For trench installation, line and grade stakes will be set parallel to the proposed pipeline at an appropriate offset therefrom as will best serve the Contractor's operations wherever practical. For tunnel installation, line and grade stakes will be set directly above the proposed pipeline setting. Grade and line stakes will be set at 25-foot intervals along the pipeline; at each change in line or grade; and as needed for pipeline appurtenances and service lines. The Contractor shall arrange operations to avoid unnecessary interference with the establishment of the primary line and grade stakes; and shall render whatever assistance may be required by the Engineer in accomplishing the staking. The Contractor shall be responsible for preservation of the primary stakes and, if negligent in providing necessary protection, shall bear the full cost of any res taking. I I I The Contractor shall be solely responsible for the correct transfer of the primary line and grade to all working points and for construction of the work to the prescribed lines and grades as established by the Engineer. Following construction of a work shaft on tunnel installations, the I I 1999 Standard Utilities Specifications Page 7 I I A3 Protection of Surface Structures I I I All surface structures and features located outside the permissible excavation limits for underground installations, together with those within the construction areas which are indicated in the Plans as being saved, shall be properly protected against damage and shall not be disturbed or removed without approval of the Engineer. Within the construc tion limits, as required, the removal of improvements such as paving, curbing, walks, turf, etc., shall be subject to acceptable replacement after completion of underground work, with all expense of removal and replacement being borne by the Contractor to the extent that separate compensation is not specifically provided for in the Contract. I I I Obstructions such as street signs, guard posts, small culverts, mailboxes, and other items of prefabricated construction may be temporarily removed during construction provided that essential service is maintained in a relocated setting as approved by the Engineer and that nonessential items are properly stored for the duration of construction. Upon completion of the underground work, all such items shall be replaced in their proper setting at the sole expense of the Contractor. I I I I I I I I The Contractor shall be responsible for protection of existing overhead utilities and poles. This shall include arranging with the utility and paying the utility for holding poles that will be close to the edge of any trench. Holding of poles and repair of any damage to these facilities shall be considered incidental to the project with no additional compensation allowed. If relocation or removal of these facilities is required, the Owner will contact the concerned utility and pay for the relocation or removal at no additional expense to the Contractor. In the event of damage to any surface improvements, either privately or publicly owned, in the absence of construction necessity, the Contractor will be required to replace or repair the damaged property to the satisfaction of the Engineer and without cost to the Owner. A4 Interference of Underground Structures When any underground structure interferes with the planned placement of the pipeline or appurtenances to such an extent that alterations in the work are necessary to eliminate the conflict or avoid endangering effects on either the existing or proposed facilities, the Contractor shall immediately notify the Engineer and the Owner of the affected structure. When any existing facilities are endangered by the Contractor's operations, the Contractor shall cease work at the site and take such precautions as may be necessary to protect the inplace structures until a decision is made as to how the conflict will be resolved. Without specific authorization from the Engineer, no essential utility service shall be disrupted, nor shall any change be made in either the existing structures or the planned installations to 'overcome the interference. Alterations in existing facilities will be allowed onlytb the extent that service will not be curtailed unavoidably and then only when the encroachment or relocation will satisfy all applicable regulations and conditions. I 1999 Standard Utilities Specifications Page 9 I I B Excavation and Preparation of Trench I Bl Operational Limitations and Requirements I I I I Excavating operations shall proceed only so far in advance of pipe laying as will satisfy the needs for coordination of work and permit advance verification of unobstructed line and grade as planned. Where interference with existing structures is possible or in any way indicated, and where necessary to establish elevation or direction for connections to inplace structures, the excavating shall be done at those locations in advance of the main operation so actual conditions will be exposed in sufficient time to make adjustments without resorting to extra work or unnecessary delay. Where possible, excavated materials shall be placed in areas that will not block existing vehicle and pedestrian traffic and drainage ways. The Contractor shall review proposed methods of operation with the Engineer prior to beginning the work. I All installations shall be accomplished by open trench construction except for short tunnel sections approved by the Engineer and with the exception that boring and jacking or tunnel construction methods shall be employed where so specifically required by the Plans, Specifications, or Special Provisions. I I Installation of pipe through tunnel excavations will be allowed only where the surface structure can be properly supported and the backfill restored to the satisfaction of the Engineer. I I The excavating operations shall be conducted so as to carefully expose all inplace underground structures without damage. Wherever the excavation extends under or approaches so close to an existing structure as to endanger it in any way, precautions and protective measures shall be taken as necessary to preserve the structure and provide temporary support. Hand methods of excavating shall be utilized to probe for and expose such critical or hazardous installations as gas pipe and power or communication cables. I I I I The Engineer shall be notified of any need for blasting to remove materials which cannot be broken up mechanically, and there shall be no blasting operations conducted until the Engineer's approval has been secured. Blasting will be allowed only when proper precautions are taken to protect life and property, and then shall be restricted as the Engineer directs. The hours of blasting operatims shall be set by the Owner. The Contractor shall assume full responsibility for any damages caused by blasting, regardless of the requirements for notification and approval. The Contractor shall secure any required permits for blasting and shall conduct blasting operations in conformance with all applicable local, state and federal laws, regulations, and ordinances. B2 Classification and Disposition of Materials I I I Excavated materials will be classified for payment only to the extent that the removal of materials classified by the Engineer as Rock will be paid for as provided in the Special Provisions or shown in the Proposal. All other materials encountered in the excavations, with the 1999 Standard Utilities Specifications Page 11 I I I I ordered by the Engineer to produce an acceptable foundatIm. Unless otherwise indicated or directed, rock shall be removed to an elevation at least six inches below the bottom surface of the pipe barrel and below the lowest projection of joint hubs. All excavations below grade shall be to a minimum width equal to the outside pipe diameter plus two feet. Rock shall be removed to such additional horizontal dimensions as will provide a minimum clearance of six inches on all sides of appurtenant structures such as valves, housings, access structures, etc. I I I I I Where no other grade controls are indicated or established for the pipeline, the excavating and foundation preparations shall be such as to provide a minimum cover over the top of the pipe as specified. Trench widths shall allow for at least six inches of clearance on each side of the joint hubs. The maximum allowable width of the trench at the top of pipe level shall be the outside diameter of the pipe plus two feet, subject to the considerations for alternate pipe loading set forth below. The width of the trench at the ground surface shall be held to a minimum to prevent unnecessary destruction of the surface structures. The maximum allowable trench width at the level of the top of pipe may be exceeded only by approval of the Engineer, after consideration of pipe strength and loading relationships. Any alternate proposals made by the Contractor shall be in writing, giving the pertinent soil weight data and proposed pipe strength alternate, at least seven days prior to the desired date of decision. Approval of altennte pipe designs shall be with the understanding that there will be no extra compensation allowed for any increase in material or construction costs. I I I I I If the trench is excavated to a greater width than that authorized, the Engineer may direct the Contractor to provide a higher class of bedding and/or a higher strength pipe than that required by the Plans, Specifications, and Special Provisions in order to satisfy design requirements, without additional compensation. B4 Sheeting and Bracing Excavations All excavations shall be sheeted, shored, and braced as will meet all requirements of the applicable safety codes and regulations; comply with any specific requirements of the Contract; and prevent disturbance or settlement of adjacent surfaces, foundations, structures, utilities, and other properties. Any damage to the work under contract or to adjacent structures or property caused by settlement, water or earth pressures, slides, cave-ins, or other causes due to failure or lack of sheeting, shoring, or bracing or through negligence or fault of the Contractor in any manner shall be repaired at the Contractor's expense and without delay. I I I I Where conditions warrant extreme care, the Plans, Specifications, and Special Provisions may require special precautions to protect life or property, or the Engineer may order the installation of sheet piling of the interlocking type or direct that other safety measures be taken as deemed necessary. Failure of the Engineer to order correction of improper or inadequate sheeting, shoring, or bracing shall not relieve the Contractor's responsibilities for protection of life, property, and the work. I I 1999 Standard Utilities Specifications Page 13 It shall be the Contractor's responsibility to notify the Engineer of changing soil conditions which may be of poor bearing capacity and when organic soils are encountered. Where utilities are placed on unstable soils without notification of the Engineer, the Contractor shall be responsible for all repairs and correction of the installation without further compensation. Where the foundation soil is found to consist of materials that the Engineer considers to be so unstable as to preclude removal and replacement to a reasonable depth to achieve solid support, a suitable foundation shall be constructed as the Engineer directs in the absence of special requirements in the Plans, Specifications, and Special Provisions. The Contractor may be required to furnish and drive piling and construct concrete or timber bearing supports or other work as may be ordered by the Engineer. Care shall be taken during final subgrade shaping to prevent any over-excavation. Should any low spots develop, they shall only be filled with approved material, which shall have optimum moisture content and be compacted thoroughly without additional compensation to the Contractor. The finished sub grade shall be maintained free of water and shall not be disturbed during pipe lowering operations except as necessary to remove pipe slings. The discharge of trench dewatering pumps shall be directed to natural drainage channels or storm water drains. Draining trench water into sanitary sewers or combined sewers will not be permitted. I I The Contractor shall install and operate a dewatering system of wells or points to maintain pipe trenches free of water wherever necessary or as directed by the Engineer to meet the intent of these specifications. Unless otherwise specified in the Plans, Specifications, and Special Provisions, such work shall be considered incidental. I All costs of excavating below grade and placing foundation or bedding aggregates as required shall be included in the bid prices for pipe items to the extent that the need for such work is indicated in the Contract provisions and the Proposal does not provide for payment under separate Contract Items. Any excavation below grade and any foundation or bedding aggregates required by order of the Engineer in the absence of Contract requirements will be compensated for separately. I I I If examination by the Engineer reveals that the need for placement of foundation aggregate was caused by the Contractor's manipulation of the soils in the presence of excessive moisture or lack of proper dewatering, the cost of the corrective measures shall be borne by the Contractor. C Non Open Cut Pipe Installation I I Cl JackingIBoring I The terms "auger", "boring", "jack", "jacking", and "tunneling" in the proposal, specifications, and plans refers only to non-open cut construction. The Contractor shall inspect and verify soil conditions to his own satisfaction in order to determine the type of construction to employ. During the construction, the Contractor shall be responsible for protecting all existing utilities above the pipe invert. I 1999 Standard Utilities Specifications Page 15 I I I I I I I I I I I I I I I I I I I The Contractor shall submit boring/drilling pit locations to the Engineer before beginning construction. The drilling equipment shall be capable of placing the pipe as shown on the plans. The installation shall be by a steerable drilling tool capable of installing continuous runs of pipe, without intermediate pits, a minimum distance of200 feet. The guidance system shall be capable of installing pipe within 1-1/2 inch of the plan vertical dimensions and 2 inches of the plan horizontal dimensions. The Contractor shall be required to remove and reinstall pipes which vary in depth and alignment from these tolerances. Pull back forces shall not exceed the allowable pulling forces for the pipe being installed. Drilling fluid shall be a mixture of water and bentonite clay. Disposal of excess fluid and spoils shall be the responsibility of the Contractor. D Placement of Insulation Rigid insulation board shall be placed within the pipe encasement zone, 6 inches above the pipe. Prior to placement of the insulation, Granular Borrow (MnDOT 3149) shall be leveled and compacted until there is no further visual evidence of increased consolidation or the density of the compacted layer conforms to the density requirements specified in the Special Provisions, then leveled and lightly scarified to a depth of 1/2 inch. Borrow material placed above and bebw the insulation shall be free of rock or stone fragments measuring 1-1/2 inches or greater. Insulation boards shall be placed on the scarified material with the long dimension parallel to the centerline of the pipe. Boards shall be placed in a single layer with tight joints. No continuous joints or seams shall be placed directly over the pipe. If two or more layers of insulation boards are used, each layer shall be placed to cover the joints of the layer immediately below. The Contractor shall exercise precaution to insure that all joints between boards are tight during placement and backfilling with only extruded ends placed end to end or edge to edge. The first layer of material placed over the insulation shall be 6 inches in depth, free of rock or stone fragments measuring 1-1/2 inches or greater. The material shall be placed in such a manner that construction equipment does not operate directly on the insulation and shall be compacted with equipment which exerts a contract pressure of less than 80 psi. The first layer shall be compacted to conform to the density requirements specified in the Special Provisions. E Pipeline Backfilling Operations All pipeline excavations shall be backfilled to restore preexisting conditions as the minimum requirement, and fulfill all supplementary requirements indicated in the Plans, Specifications, and Special Provisions. The backfilling operations shall be started as soon as conditions, will permit on each section of pipeline, so as to provide continuity in subsequent operations and restore normal public service as soon as practicable on a section-by-section basis. All operations shall be pursued diligently, with proper and adequate equipment, as will assure acceptable results. I I 1999 Standard Utilities Specifications Page l7 I I I succeeding layer thereon. The manner of placement, compaction equipment, or procedure effectiveness shall be subject to approval of the Engineer. I All surplus or waste materials remaining after completion of the backfilling operations shall be disposed of in an acceptable manner within 24 hours after completing the backfill work on each particular pipeline section. Disposal at any location within the project limits shall be as specified, or as approved by the Engineer; otherwise, disposal shall be accomplished outside the project limits at the Contractor's discretion. The backfilling and surplus or waste disposal operations shall be a part of the work required under the pipeline installation items, not as work that may be delayed until final cleanup. I I I Compaction of backfill within Roadbed areas shall meet the density requirements ofMn/DOT Specification 2105. Compaction of backfill in all other areas shall be as required in the Special Provisions. I Until expiration of the guarantee period, the Contractor shall assume full responsibility and expense for all backfill settlement and shall refill and restore the work as directed to maintain an acceptable surface condition, regardless of location. All additional materials required shall be furnished without additional cost to the Owner. I Any settlement of road surfaces that are either placed under this Contract or by others under either public or private contract; that are in excess of one inch, as measured by a ten foot straight edge; and that are within the guarantee period shall be considered failure of the mechanical compaction. The Contractor shall be required to repair such settlement including all items placed by others. I I I F Restoration of Surface Improvements I I Wherever any surface improvements such as pavement, curbing, pedestrian walks, fencing, or turfhave been removed, damaged or otherwise disturbed by the Contractor's operations, they shall be repaired or replaced to the Engineer's satisfaction, as will restore the improvement in kind and structure to the preexisting condition. Each item of restoration work shall be done as soon as practicable after completion of installation and backfilling operations on each section of pipeline. I In the absence of specific payment provisions, as separate Contract Items, the restoration work shall be compensated for as part of the work required under those Contract Items which necessitated the destruction ani replacement or repair, and there will be no separate payment. If separate pay items are provided for restoration work, only that portion of the repair or reconstruction which was necessitated by the Contract work will be measured for payment. Any improvements removed or damaged unnecessarily or undermined shall be replaced or repaired at the Contractor's expense. I I I 1999 Standard Utilities Specifications Page 19 I I F3 Restoration of Miscellaneous Items I I Wherever any curbing, curb and gutter sections, pedestrian walks, fencing, driveway surfacing, or other improvements are removed or in any way damaged or undermined, they shall be restored to original condition by repair or replacement as the Engineer considers necessary. Replacement of old materials will be acceptable only to the extent that existing quality can be fully achieved, such as in the case of fencing. Otherwise new materials shall be provided and placed as the Engineer directs. Workmanship and finished quality shall be equal to that of new construction, where new ma terials are used, to the extent obtainable in consideration of operational restrictions. I I I I A proper foundation shall be prepared before reconstructing concrete or bituminous improvements. Unless otherwise directed, granular material shall be placed to a depth of at least four inches under all concrete and bituminous items. No direct compensation will be made for furnishing and placing this material even though such course was not part of the original construction. G Maintenance and Final Cleanup I I All subgyade surfaces shall be maintained acceptably untilthe start of surfacing construction or restoration work, and. until the work has been fmally accepted. Additional materials shall be provided and placed as needed to compensate for trench settlement and to serve as temporary construction pending completion of the final surface improvements. I Final disposal of debris, waste materials, and other remains or consequences of construction, shall be accomplished intermittently as new construction items are completed and shall not be left to await final completion of all work. Cleanup operations shall be considered as being a part of the work covered under the Contract Items involved and only that work which cannot be accomplished at any early time shall be considered as final cleanup work not attributable to a specific Contract Item. I I I If disposal operations and other cleanup work are not conducted properly as the construction progresses, the Engineer may withhold partial payments until such work is satisfactorily pursued or he may deduct the estimated cost of its performance from the partial estimate value. Maintenance of sodded and seeded areas shall include adequate watering for plant growth and the replacement of any dead or damaged sod as may be required for acceptance of the work. I 2600.4 METHOD OF MEASUREMENT I All items will be measured separately according to design designation as indicated in the Pay Item name and as may be detailed and defined in the Plans, Specifications, or Special Provisions. Complete-in-Place items shall include all component parts thereof as described or required to complete the unit, but excluding any excesses covered by separate Pay Items I I I I 1999 Standard Utilities Specifications Page 21 I I I When special aggregate backfill material<; are required to be furnished and placed to comply with the indicated Laying Conditions, the costs shall be included for payment as part of the pipe items without any direct compensation. Otherwise, the furnishing of aggregate materials for backfill by order of the Engineer in the absence of such requirements will be compensated for as an Extra Work item. I I In the absence of special payment provisions, all costs of restoring surface improvements as required, disposal of surplus or waste materials, maintenan::e and repair of completed work, and final cleanup operations shall be incidental to the Contract Items under which the costs are incurred. I I Granular materials furnished for foundation, bedding, cover, or backfill placement as specified in connection with pipe or structure items will only be paid for as separate Contract Items to the extent that the Proposal contains specific Pay Items. Otherwise the furnishing and placing of granular materials as specified shall be incidental to the pipe or structure item without any direct compensation being made. I I I I I I I I I I 1999 Standard Utilities Specifications Page 22 I I I I I I I I I I I I I I I I I I I TABLE OF CONTENTS SECTION 2611 STANDARD SPECIFICATIONS FOR WATER MAIN AND SERVICE LINE INSTALLATION 2611.1 Description................................................................................................... .24 2611.2 Materials ... .......... ..... .......... ..... .............. ................. ..... ........ ............... .... ... ...,26 A Water Pipe Materials........................ ......... .......... ...... ............. ................. .......26 Al Ductile Iron Pipe and Ductile Iron and Gray Iron Fittings ...........................26 A2 Prestressed Concrete Cylinder Pipe and Fittings ..........................................27 A3 Polyvinyl Chloride (PVC) Pressure Pipe and Fittings ..................................27 A4 Polyethylene (PE) Pressure Pipe and Fittings ...............................................27 B Fire Hydrants.......................... ........... .......... ........ .................... ................. .......28 C Valves and Valve Housings ..... ....... ........................ ............ ..................... .......29 C 1 Valve Housings ..................................................................... ....................... .29 C2 Gate Valves. ............................. ............... .................... .............. ............. .......29 C3 Butterfly Valves................................. ............ ................... ....... ...... ............. ..29 D Water Service Pipe and Fittings.... ......... ..... ......................... ...........................30 E Polyethylene Encasement Material...... ...... ......... ......... ........... ................. .......30 F Restrained Joint Retainer Glands ....................................................................3l G Mortar .............................. .................. ...... ............... ............ .......... ..... ........... ..31 H Concrete................. ..... ..................... ...................... ...... ...... ..... ..................... ...31 2611.3 Construction Requirements .... ......... ............... ..... ............ ....... ................... .31 A Installation of Pipe and Fittings ......................................................................31 Al Inspection and Hmdling ....................................... ..... ........ .... ................. .... ..32 A2 Pipe Laying Operations ................................... .......... ............... ...... ............. .32 A3 Aligning and Fitting of Pipe ....... .......... ............. ............... ....... ............ ...... ...3 3 A4 Blocking and Anchoring of Pipe...................... ........... ............ ...... ............. ..33 A5 Polyethylene Encasement of Pipeline ............. ........ .............. ..................... ...34 B Connection and Assembly of Joints ................................................................35 Bl Ductile Iron Pressure Pipe and Fitting Joints................................................36 B 1 a Push-On Joints........................................... ............................................ ......36 :-;;. B 1 b Mechanical Joints......................................... ......... ........ ....... ................. ..~...3 6 B 1 c Flanged Joints........................................... ................. .... ............................. .36 B2 Prestressed Concrete Cylinder Pipe Joints ....................................................37 B3 Polyvinyl Chloride Pipe Joints........... .................. .... .............. ........ ......... ......3 7 1999 Standard Utilities Specifications Page 24 I I I I I I I I I I I I I I I I I I I 2611 STANDARD SPECIFICATIONS FOR WATER MAIN AND SERVICE LINE INSTALLATION 2611.1 DESCRIPTION This work shall consist of the construction of water main and building service pipelines utilizing plant fabricated pipe and other appurtenant materials, installed for conveyance of potable water. The work includes the relocation or adjustment of existing facilities as may be specified in the Plans, Specifications and Special Provisions. Use of the term "Plans, Specifications and Special Provisions" within this specification shall be construed to mean those documents which compliment, modify, or clarify these specifications and are accepted as an enforceable component of the Contract or Contract Documents. All references to MnlDOT Specifications shall mean the latest published edition of the Minnesota Department of Transportation Standard Specifications for Construction, as modified by any MnlDOT Supplemental Specification edition published prior to the date of advertisement for bids. All reference to other Specifications of AASHTO, ASTM, ANSI, A WW A, etc. shall mean the latest published edition available on the date of advertisement for bids. The following American Water Works Association (AWWA) Specifications have been referenced in this Specification: C104 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water C 1 05 American National Standard for Polyethylene Encasement for Ductile-Iron Pipe Systems CII0 American National Standard for Ductile-Iron and Gray-Iron Fittings, 3 In. Through 48 In. (75 rum Through 1200 mm), for Water and Other Liquids Clll American National Standard for Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings C115 American National Standard for Flanged Ductile-Iron Pipe With Ductile-Iron or Gray-Iron Threaded Flanges Cl50 American National Standard for Thickness Design of Ductile-Iron Pipe C15l American National Standard for Ductile-Iron Pipe, Centrifugally Case, for Water or Other Liquids Cl53 American National Standard for Ductile-Iron Compact Fittings, 3 In. Throrlgh 24.Jn. (76 mm Through 610 rum) and 54 In. Through 64 In. (1,400 mm Through l,600 rum), for Water Service 1999 Standard Utilities Specifications Page 26 I I I I I I I I I I I I I I I I I I I stop coupling and beyond to the property line or to the limits as established by the Engineer. Tapped Service lines shall be installed at the size specified in the Plans, Specifications, and Special Provisions. Branch Service installations shall include all water service lines of three inches nominal inside diameter pipe and larger. The component parts of a branch service installation shall include a tapping sleeve and valve or a tee connection and valve complete with valve box, and piping extending from the water main connection, to the property line or to the limits as specified by the Engineer. All references to Gray Iron material shall be construed to include both Gray Iron and Ductile Iron products, except where one or the other is specified, and all references to Polyvinyl Chloride pipe shall be construed to include only pressure pipe complying with A WW A C-900 or C-905. All references to "structure" shall include any man-made object that is not otherwise exempted by special terminology or defmition. 2611.2 MATERIALS All materials required for this work shall be new material conforming to requirements of the reference specifications for the class, kind, type, size, grade, and other details indicated in the Contract. Unless otherwise indicated, all required materials shall be furnished by the Contractor. If any options are provided for, as to type, grade, or design of the material, the choice shall be limited as may be stipulated in the Plans, Specifications, or Special Provisions. All manufactured products shall conform in detail to such standard design drawings as may be referenced or furnished in the Plans. Otherwise, the Owner may require advance approval of material suppliers, product design, or other unspecified details as it deems desirable for maintaining adopted standards. At the request of the Engineer, the Cortractor shall submit, in writing, a list of materials and suppliers for approval. A Certificate of Compliance shall be furnished stating that the materials fumished have been tested and are in compliance with the specification requirements. A Water Pipe Materials All pipe furnished for water main and branch line installations shall be of the type, kind, size, and class indicated for each particular line segment as shown in the Plan and designated in the Contract Items. Wherever connection of dissimilar materials or designs is required, the method of joining and any special fittings employed shall be subject to approval of the Engineer. AI Ductile Iron Pipe and Ductile Iron and Gray Iron Fittings The pipe furnished shall be Ductile Iron pipe fittings furnished shall be of the Ductile Iron or Gray Iron type as specified for each particular use of installation. When Gray Iron is specified, 1999 Standard Utilities Specifications Page 28 I I I I I I I I I I I I I I I I I I I The standard HDPE fittings shall be standard commercial products manufactured by injection molding or by extrusion and machining, or, shall be fabricated from PE pipe conforming to this specification. The fittings shall be fully pressure rated by the manufacturer to provide a working pressure equal to the pipe, for 50 years service at 73.4 degrees Fahrenheit with an included 2:1 safety factor. The fittings shall be manufactured from the same resin type, grade, and cell classification as the pipe itself. The manufacture of the fittings shall be in accordance with good commercial practice to provide fittings homogeneous throughout and free from crack, holes, foreign inclusions, voids, or other injurious defects. The fittings shall be as uniform as commercially practicable in color, opacity, density and other physical properties. The minimum "quick-burst" strength of the fittings shall not be less than that of the pipe with which the fitting is to be used. B Fire Hydrants Fire hydrants shall be of the type, size, and construction specified in the Plans and shall conform to the applicable requirements of A WW A C-502. Unless otherwise specified in the Plans, Specifications, and Special Provisions, hydrants shall be furnished in conformance with the following supplementary requirements: (1) Hydrants shall have a five-inch (nominal diameter) main valve opening of the type that opens against water pressure. (2) Hydrant barrels shall be two piece, non-jacket type, with flanged joint above fmished grade line and with mechanical joint connection at the hub end for joining a six- inch ductile iron branch pipe. (3) Hydrant bury length, measured from the bottom of the branch pipe connection to the fmished ground line at the hydrant, shall be 7'_6". (4) Hydrants shall have two outlet nozzles for 2-1/2 inch (LD.) hose connection and one outlet nozzle for 4 inch (LD.) steamer connection. All outlet nozzle threads shall be National Standard Fire-Hose Coupling Screw Threads (NFPA 1963). (5) Hydrant operating mechanisms shall be provided with "0" ring seals preventing entrance of moisture and shall be lubricated through an opening in the operating nut or bonnet. (6) Hydrants shall be provided with outlets for drainage in the base or barrel, or between the base and barrel, unless the Special Provisions require that drain outlets be omitted or plugged. (7) The hydrant operating nut shall be rotated counterclockwise to open. (8) Detailed drawings, catalog information, and maintenance data shall be furnished as requested by the Engineer. 1999 Standard Utilities Specifications Page 30 I I I I I I I I I I I I I I I I I I I provisions hereof. Unless otherwise specified, the butterfly valves furnished shall comply with the following supplementary requirements. (1) The butterfly valves shall be short body of ductile or cast iron with mechanical joint ends. (2) The butterfly valves shall be rubber seated with ductile or cast disc, non-rising stem type furnished with O-ring stem seals. (3) The butterfly valves shall be equipped with a two-inch square operating nut opening counterclockwise. (4) The butterfly valves shall be designed for direct burial installation. (5) All butterfly valves shall have an open indicating arrow, the manufacturer's name, pressure rating and year of manufacture on the valve bodies. D Water Service Pipe and Fittings Water service pipe of 3 inches or larger inside diameter smll conform to the requirements for Ductile Iron Pipe and Ductile Iron and Gray Iron Fittings as set forth under the provisions of 261l.2Al, and Polyvinyl Chloride Pressure Pipe as set forth under the provisions of2611.2A3, and Polyethylene pipe as set forth under the provision of 2611.2A4. Water service pipe of less than 3 inches in inside diameter shall conform to the requirements of ASTM B 88 for Seamless Copper Water Tube, Type K, Soft Annealed temper, Polyethylene Pipe as per A WW A C901 or Polyvinyl Chloride Pipe and fittings as per a ASTM D1785, D224l, D2466, D2467 and D2740 as specified on the Proposal or in the Special Provisions. Corporation stops, saddles, curb stops, and curb stop service boxes shall conform to the requirements of A WW A C800 be as detailed in the Plans, Specifications, and Special Provisions or approved designations. All fittings for copper tubing shall be cast brass, having uniformity in wall thickness and strength, and shall be free of defects affecting serviceability. All copper pipe fittings shall be flared or compression type. All threads for underground service line fittings shall conform to the requirements of A WW A C-800. Each fitting shall be permanently and plainly marked with the name or trademark of the manufacturer. Curb stop service boxes shall be gray iron castings conforming to the requirements of ASTM A 48 for Class 20 or higher tensile strength and shall have l8 inches of vertical adjustment for the cover depth specified in the Plans, Specifications, and Special Provisions. E Polyethylene Encasement Material Polyethylene encasement material shall conform to the requirements of A WW A C-105 for tube type installation and 8 mil nominal film thickness. I I 1999 Standard Utilities Specifications Page 32 I I Al Inspection and Handling I Proper and adequate implements, tools, and facilities satisfactory to the Engineer shall be provided and used by the Contractor for the safe and convenient prosecution of the work. During the process of unloading, all pipe and accessories shall be inspected by the Contractor for damage. The Contractor shall notify the Engineer of all material found to have cracks, flaws or other defects. The Engineer shall inspect the damaged material and have the right to reject any materials found to be unsatisfactory. The Contractor shall promptly remove all rejected material from the site. I I I I All materials shall be handled carefully, as will prevent damage to protective coatings, linings, and joint fittings; preclude contamination of interior areas; and avoid jolting contact, dropping, or dumping. I I While suspended and before being lowered into laying position, each pipe section and appurtenant unit shall be inspected by the Contractor to detect damage or unsound conditions that may need corrective action or be cause for rejection. The Contractor shall inform the Engineer of any defects discovered and the Engineer will prescribe the required corrective actions or order rejection. I Immediately before placement, the joint surfaces of each pipe section and fitting shall be inspected for the presence of foreign matter, coating blisters, rough edges or projections, and any imperfections so detected shall be corrected by cleaning, trimming, or repair as needed. A2 Pipe Laying Operations I I I I I Trench excavation and bedding preparations shall proceed ahead of pipe placement as will permit proper placement and joining of the pipe and fittings at the prescribed grade and alignment without unnecessary hindrance. All foreign matter or dirt shall be removed from the inside of the pipe and fittings before they are lowered into position in the trench, and they shall be kept clean by approved means during and after laying. The water main materials shall be carefully lowered into laying position by the use of suitable restraining devices. Under no circumstances shall the pipe be dropped or dumped into the trench. At the time of pipe placement, the bedding conditions shall be such as to provide uniform and continuous support for the pipe between bell holes. Bell holes shall be excavated as necessary to make the joint connections, but they shall be no larger than would be adequate to support the pipe throughout its length. No pipe material shall be laid in water nor when the trench or bedding conditions are otherwise unsuitable or improper. I When placement or handling precautions prove inadequate, in the Engineer's opinion, the Contractor shall provide and install suitable plugs or caps effectively closing the open ends of each pipe section before it is lowered into laying position, and they shall remain so covered until removal is necessary for wnnection of an adjoining unit. I 1999 Standard Utilities Specifications Page 34 I I I I I I I I I I I I I I I I I I I (1) All horizontal bends exceeding 20 degrees deflection, and all caps, plugs, and branch tees shall be provided with concrete buttress blocking. (2) All vertical bends exceeding 20 degrees deflection shall be provided with concrete buttress blocking at the low points and with metal tie rod or strapping restraints at the high points. (3) Offset bends made with standard offset fittings reed not be strapped or buttressed. Hardwood blocking shall only be used as temporary reaction backing until acceptable permanent reaction blocking or restraining devices have been installed. Blocking shall be nomina12-inch timber having an area equivalent to at least four times the area of the surface of the cap or plug it restrains. Concrete buttresses shall be poured against firm, undisturbed ground and shall be formed in such a way that the joints will be kept free of concrete and remain accessible for repairs. The concrete mix used in buttress construction shall meet the requirements for Grade B concrete in conformance with MnlDOT Specification Section 246l. Buttress dimensions shall be a minimum of l2 inches in thickness, and the minimum area, in sqmre feet shall be as follows. PIPE TEE OR 1/4 BEND 1/8 BEND 1/32 BEND SIZE PLUG 1/16 BEND 6" 2.9 3.1 1.6 0.8 8" 3.7 5.3 2.9 1.4 10" 5.7 8.1 4.4 2.2 12" 8.l 13.4 6.6 3.2 16" l5.l 21.4 11.6 5.9 20" 23.2 30.2 18.1 9.3 24" 33.6 48.5 26.1 13.3 Contractors are instructed to size concrete buttress blocking on fittings and dead ends where the blocking must withstand the pressure of larger main line fittings equipped with reducers, for the larger sized main line thrust and not for smaller fitting size only. This is of particular importance on tees and crosses where the main size is reduced on the run from large to small size by use of reducers. All metal parts of tie rod or strap type restraints shall be galvanized or coated with other approved asphaltic type rustproofing. All necessary fittings, bands, tie rods, nuts, and washers, and all labor and excavation required for installation of reaction restraints shall be furnished at the Contractor's expense with no direct compensation provided therefore. AS Polyethylene Encasement of Pipeline Wherever so required by the Plans, Specifications, or Special Provisions, the pipeline, including valves, fittings, and appurtenances, shall be fully encased in polyethylene film meeting the 1999 Standard Utilities Specifications Page 36 I I I I I I I I I I I I I I I I I I I Bl Ductile Iron Pressure Pipe and Fitting Joints Ductile iron pressure pipe and fitting joints shall conform to AWW A C-l11. Bla Push-On Joints The circular rubber gasket shall be kept in a warm, flexible condition at all times, and for purposes of placement shall be flexed inward and inserted in the gasket recess of the bell socket. A thin film of approved gasket lubricant shall be applied to either the inside surface of the gasket or the outside surface of the spigot end, or to both. Care shall be taken while inserting the spigot end to prevent introduction of contaminants. The joint shall be completed by forcing the spigot end to the bottom of the socket by the use of suitable pry-bar or jack type equipment. Spigot ends which do not have depth marks shall be marked before assembly to insure full insertion. Field cut pipe shall be filed or ground at the spigot edge to resemble the manufacturer's fabricated detailing. The use of the bucket on the excavation equipment to force the pipe into the socket shall not be permitted. BIb Mechanical Joints The last eight inches of the outside spigot surface and the inside bell surface of each pipe and appurtenance joint shall be painted with a soap solution, after being thoroughly cleaned. The gland shall then be slipped on the spigot end with the lip extension toward the socket or bell end. The rubber gasket shall be kept in a warm, flexible condition at all times, and for purposes of placement shall be painted with soap solution and be placed on the spigot end with the thick edge toward the gland. An approved lubricant provided by the pipe manufacturer may be used in lieu of the soap solution. After the spigot end is inserted into the socket to full depth and centered, the gasket shall be pressed into place within the bell evenly around the entire joint. After the gland is positioned behind the gasket, all bolts shall be installed and the nuts tightened alternately to the specified torque, such as to produce equal pressure on all parts of the gland. Unless otherwise specified, the bolts shall be tightened by means of a suitable torque-limiting wrench to within a foot-pound range of: 45 to 60 for 5/8 inch bolts; 75 to 90 for 3/4 inch bolts; 85 to lOO for 1 inch bolts; and 105 to 120 for 1-1/4 inch bolts. After tightening, all exposed parts of the bolts and nuts shall be completely coated with an approved asphaltic type rust preventive material. Blc Flanged Joints Flanged joints shall be installed only in above grade or exposed locations and shall conform to the requirements of A WW A Cll5 Specifications, the Plans, Specifications ani Special, Provisions. Flanged joints shall have full face gaskets. I I I 1999 Standard Utilities Specifications Page 38 I I I I pipelines and provide proper and adequate bearing for all pipes and appurtenances. For separate installation, the trench width shall be not less than two feet. Subject to minimum clearances, the water lines may be laid in a common trench excavated principally for sewer installation, either by widening the trench as necessary or by providing a shelf in the trench wall where ground stability will permit. When water service pipe is placed in a common trench with sewer service pipe, the sewer service pipe shall be constructed of materials and with joints equivalent to water main standards. I I I I I Water service lines shall be installed to provide for the specified cover over the top of the pipe and with not less than 18 inches of clearance between pipelines. A minimum 3 inches of clearance shall be maintained in crossing over or under other structures. Where the service pipe may be exposed to freezing due to insufficient cover or exposure from other underground structures, the water pipe shall be insulated as directed by the Engineer. Cl Tee Branch Service Lines Tee branch service piping shall be of the type, size, and wall thickness specified. The pipe and appurtenances shall have rubber gasketed push-on or mechanical joints. Tee branch service lines shall be provided as required by the Plans. Installation of tee branch service facilities shall be in accordance with all applicable requirements of these specifications as pertain to the mainline installations. I C2 Tapped Service Lines I Service piping shall be of the size and type specified. Unless otherwise specified, minimum pipe size for tap service installations shall be one inch nominal inside diameter. Larger size pipe may be specified for commercial and industrial uses or for some domestic service as specifically identified. I I I Installation of service facilities shall be in accordance with all applicable requirements of these specifications as pertain to the mainline installations, subject to the exceptions and supplementary provisions set forth hereinafter. Unless otherwise indicated, service piping may be laid directly on any solid foundation soil that is free of stones and hard lumps. However, when specified or ordered, aggregate materials shall be furnished and placed as necessary to secure proper foundation drainage, pipe covering, or backfill support. I I Tapped service piping of 3/4 inch to and including l-1I4 inches in diameter shall be installed in one piece without intermediate joint couplings between the corporation stop and the curb stop. Service pipe of l-l /2 inches in diameter and larger shall be furnished in standardTollleJJgths to eliminate any intermediate joints. When full roll lengths are less than the service length the rolls may be joined with approved couplings. 1999 Standard Utilities Specifications Page 40 I I I I I I I I I I I I I I I I I I I Valve boxes shall be centered over the valve wrench nut and be installed plumb, with the box cover flush with the surface of the fmished pavement or at such other level as may be directed. Masonry valve pit structures, for valves with exposed gearing or operating mechanisms, shall be constructed in accordance with the details shown in the Plans and with the applicable provisions of these Specifications. Drainage blow-offs, air vents, and other special appurtenances shall be provided and installed as required by the Plans, Specifications, and Special Provisions. All dead ends shall be closed with approved plugs or caps and shall be equipped with suitable blow-off facilities. E Disinfection of Water Mains Before being placed in service, the completed water main shall be disinfected. Disinfection materials and procedures, and the collection and testing of water samples, shall be in accordance with the provisions of A WW A C-651. After the fmal flushing the water shall be tested for bacteriologic quality and found to meet the standards prescribed by the Minnesota Department of Health. Where an existing water main is cut for the installation of any fitting, the pipe and fittings proposed to be installed shall be disinfected prior to installation as follows: (1) The interior of the pipe and fittings shall be cleaned of all dirt and foreign material. (2) The interior of the pipe and fittings shall be thoroughly swabbed or sprayed with a 1 percent minimum hypochlorite solution. Unless otherwise indicated in the Plans, Specifications, and Special Provisions, the Contractor shall furnish all materials and perform the disinfecting, flushing, and testing as necessary for meeting the water quality requirements. The flushing operations and the form of chlorine and method of application to be used shall be subject to approval by the Engineer. F Electrical Conductivity Test The Contractor shall perform a conductivity test within one week after completion of pressure testing of the main on all iron pipe water mains to establish that electrical thawing may be carried out in the future The system (pipeline, valves, fittings and hydrants) shall be tested for electrical continuity and current capacity. The electrical test shall be made after the hydrostatic pressure test and while the line is at normal operating pressure. Backfilling shall have been completed. The line may be tested in sections of convenient length as approved by the Engineer. Direct current of 350 amperes + 10%, shall be passed through the pipeline for 5 minutes. Current flow through the pipe shall be measured continuously on a suitable ammeter and shall remain steady without interruption or excessive fluctuation throughout the 5- minute test period. I 1999 Standard Utilities Specifications Page 42 I I I If this test requirement cannot be met, the Contractor shall investigate the cause, make corrections, and retest until the pressure drop requirement can be met. I Only if several consecutive tests indicate a consistent pressure drop and only after the Contractor has made numerous attempts to resolve the problem, acceptable to the Engineer, may the Contractor request in writing and the Engineer consider the use of the leakage test. The leakage test may be performed by the Contractor to determine the magnitude of the leak, however, meeting the leakage allowance shall not automatically be considered acceptance, in lieu of the pressure test, for the section being tested. Final acceptance shall be at the discretion of the Engineer. I I I When allowed, the leakage test shall be performed in accordance with A WW A C-600, Section 4.1.5,4.1.6 and the line will be accepted as per Section 4.1.7. H Operational Inspection I At the completion of the project and in the presence of the Engineer and the Contractor, representatives of the Owner shall operate all valves, hydrants, and water services to ascertain that the entire facility is in good working order; that all valve boxes are centered and valves are opened; that all hydrants operate and drain properly; that all curb boxes are plumb and centered; and that water is available at all curb stops. I 2611.4 METHOD OF MEASUREMENT I All items will be measured separately according to design designation as indicated in the Pay Item name and as may be detailed and defined in the Plans, Specifications, or Special Provisions. Pipe will generally be designated by size (inside diameter or span), strength class, kind or type, and laying condition. Payment shall include all component parts thereof as described or required to complete the unit, but excluding any item covered by a separate pay item. Lineal measurement of piping will include the running length of any special fittings (tees, wyes, bends, gates, etc.) installed within the line of measure between specified terminal points. I I I I I I A Water Pipe Mainline pipe and service pipe of each kind and size will be measured separately by the overall length along the axis of the pipeline, from beginning to end of each installation and without regard to intervening valves or specials. Terminal points of measure will be the spigot or cut end, base of hub or bell end, center of valves or hydrants, intersecting centers of tee or wye branch service connections, and center of corporation stop or curb stop couplings. B Valves Valves of each size and type will be measured separately as complete units, including the required manhole or valve box setting. I I I 1999 Standard Utilities Specifications Page 44 I I I Otherwise, the required structures are included for payment as part of the pipe appurtenance (Gate Valve, Curb Stop, Air Vent, etc.) item which is served. When applicable, measurement will be by the number of individual units installed of each type and design. I 2611.5 BASIS OF PAYMENT I Payment for construction of water distribution facilities will be made as detailed in the method of measurement and as shown on the Bid Proposal or detailed in the Special Provisions. Payment shall include all costs of furnishing and installing the complete facility as required by the Plans, Specifications, and Special Provisions. I I Payment shall be made for Water Main Pipe, Service Pipe, and Tapped Service Pipe, of each size and kind at the appropriate Contract prices per linear foot installed All costs of pipeline disinfection, leakage testing, pipe jointing materials, dead end plugs and caps, making connections to existing facilities, blocking and anchorage materials, and other work necessary for proper installation of pipe as specified shall be included for payment as part of the pipe item, without any direct compensation being made therefore unless specific pay items are included on the Proposal. I I I Payment shall be made for Valves, Corporation Stops, Curb Stops, Hydrants, Air Vents, Polyethylene Encasement, Insulation, and other specially identified appurtenant items, at the appropriate Contract prices per unit of measure for each size and type or kind installed. Access structures such as Valve Boxes, Service Boxes, Manholes, and Vaults will be paid for as separate items only when separate pay items are included on the Proposal. I I Payment for rearrangement of inplace facilities or vertical offset of proposed facilities shall be made under specially named items at the appropriate Contract prices per unit of measure and shall be compensation in full for all costs of performing the work as specified. I I I I All costs of excavating to foundation grade, preparing the foundation, placing and compacting backfill materials, restoring surface improvements, and other work necessary for prosecution and completion of the work as specified, shall be included for payment as part of the pipe and pipe appurtenance items without any direct compensation being made therefore, unless specific pay items are included on the Proposal. When special aggregate backfill materials are required to be furnished and placed to comply with the indicated Laying Conditions, the costs thereof shall be included for payment as part of the pipe items without any direct compensation therefore. In the absence of special payment provisions, all costs of repairing, replacing, or otherwise restoring surface improvements as required by the Contract shall be included for payment as part of other Contract items without any direct compensation being made therefore. I I 1999 Standard Utilities Specifications Page 41 I I I I I I I I I I I I I I I I I I I F3 Test Failure and Remedy........... .......... .............. .... ............ ........ ........ .......... ..56 G Deflection Test........... .......... ....................... ...................... ........................ ..... .56 H Televising..... ........................................................ ................ ......... ........ ......... .56 2621.4 Method of Measurement. .............................. ......................................... .....56 A Sewer Pipe.................. ........ ....... ................. ..................... ............................ ...57 B Manholes..................... ................ ................ ............................ ......... ............... 57 C Catch Basins..... ............ ................ ..................... ..................... ......... ............ ....57 D Outside Drop. Connection.... ..... ...................................... ................. ............. ..57 E Service Connection.................................................................................... .....5 8 F Service Pipe:...... ....... ............ ....... ........ ......... ................................ .... ............. ..58 G Special Pipe"Fittings .................. ........... ...... ............... ...... ......... ............ ......... .58 H Appurtenant Items ....... ................. ....... .......... .................. ................ ............... .58 2621.5 Basis of Payment .................... ....... .................. ......... ...... ......... .................... .58 1999 Standard Utilities Specifications Page 43 I I I I I I I I I I I I I I I I I I I ASTM C700 Specification for Vitrified Clay Pipe ASTM D232l Recommended Practice for Installation of Flexible Thermo-plastic Sewer Pipe ASTM D275l Specification for ABS Pipe and Fittings ASTM D3034 Specification for PVC Sewer Pipe and Fittings ASTM D32l2 Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals ASTM F679 Specification for Large-Diameter PVC Sewer Pipe and Fittings ASTM F949 Specification for Poly (Vinyl Chloride) (PVC) Corrugated Sewer Pipe with a Smooth Interior and Fittings A WW A Cl04 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water A WW A Cll0 American National Standard for Ductile-Iron and Gray-Iron Fittings, 3 In. Through 48 In. (75 mm Through l200 mm), for Water and Other Liquids A WW A Clll American National Standard for Rubber-Gasket Joints for Ductile-Iron Pressure P:ipe and Fittings A WW A C l15 American National Standard for Flanged Ductile- Iron Pipe With Ductile- Iron or Gray-Iron Threaded Flanges A WWA C150 American National Standard for Thickness Design of Ductile-Iron Pipe A WW A Cl51 American National Standard for Ductile-Iron Pipe, Centrifugally Case, for Water or Other Liquids A WW A C153 American National Standard for Ductile-Iron Compact Fittings, 3 In. Through 24 In. (76 mm Through 610 mm) and 54 In. Through 64 In. (1,400 mm Through 1,600 mm), for Water Service 2621.2 MATERIALS All materials required for this work shall be new material conforming to requirements of the referenced specifications for the class, kind, type, size, grade, and other details indicated in the Contract. Unless otherwise indicated, all required materials shall be furnished by"the Contractor. If any options are provided for, as to type, grade, or design of the material, the choice shall be limited as may be stipulated in the Plans, Specifications, or Special Provisions. 1999 Standard Utilities Specifications Page 45 I I I I I I I I I I I I I I I I I I I Ductile iron pipe shall conform to the requirements of A WW A C l15 or C l5l for water and thickness design shall conform to A WW A C 150. In addition, the pipe shall comply with the following supplementary provisions: (1) Fittings shall conform to the requirements of AWWA ClIO OR 153 (Gray Iron and Ductile Iron Fittings or Ductile Iron Compact Fittings) for the joint type specified. (2) Unless otherwise specified, all pipe and fittings shall be furnished with cement mortar lining meeting the requirements of A WW A C 104 for standard thickness lining. All exterior surfaces of the pipe and fittings shall have an asphaltic coating at least one mil thick. Spotty or thin seal coating, or poor coating adhesion, shall be cause for rejection. (3) Rubber gasket joints for Ductile Iron Pressure Pipe and fittings shall conform to A WW A ClII. A3 Reinforced Concrete Pipe and Fittings Reinforced concrete pipe, fittings and specials shall conform with the requirements of ASTM C- 76 (Reinforced Concrete Pipe) with rubber O-ring or profile joints for the type, size, and strength class specified, subject to the following supplementary provisions: (1) All branch fittings such as tees, wyes, etc. shall be cast as integral parts of the pipe. All fittings and specials shall be of the same strength class as the pipe to which they are attached. (2) Joints shall meet the requirements of ASTM C-36I. (3) Lift holes will not be permitted unless specifically authorized in the Plans, Specifications, and Special Provisions A4 Corrugated Steel Pipe and Fittings Corrugated steel pipe and fittings shall conform to the requirements ofMnlDOT Specification 3226 (Corrugated Steel Pipe) for the type, size and sheet thickness specified. When specifically provided for in the Plans, Specifications, and Special Provisions, the galvanized steel pipe and fittings shall be furnished with special aramid fiber bonded, bituminous, or plastic coating or concrete lining as required. AS Polyvinyl Chloride Pipe and Fittings Smooth walled polyvinyl chloride pipe and fittings shall conform with the requirements of ASTM 1).3034 and ASTM F-679 for the size, standard dimension ratio (SDR), and strength requirements indicated on the Plans, Specifications, and Special Provisions. The grade y.sed shall be resistant to aggressive soils or corrosive substances in accordance with the requirements of ASTM 1).543. Unless otherwise specified, all pipe and fIttings shall be. SDR 35 and connections shall be push-on with elastomeric gasketed joints which are bonded to the inner wall of the gasket recess of the bell socket. 1999 Standard Utilities Specifications Page 47 I I I I (4) A Certificate of Compliance shall be furnished with each shipment of castings stating that the materials furnished have been tested and are in compliance with the specification requirements. (5) Unless otherwise specified, sanitary sewer manholes in areas subject to flooding by surface water shall have self- sealing lids and recessed pick holes. (6) Unless otherwise specified, sanitary sewer manhole lids shall have recessed pick holes. I C Precast Concrete Manhole and Catch Basin Sections I I Precast concrete riser sections and appurtenant units (grade rings, top and base slabs, special sections, etc.) used in the construction of manhole and catch basin structures shall conform with the requirements of ASTM C-478, Mn/DOT 2506 and the following supplementary provisions: (1) The precast sections and appurtenant units shall conform to all requirements as shown on the detailed drawings. I I (2) Joints of manhole riser sections shall be tongue and groove with rubber "0" ring or profile joints provided on sanitary sewer manholes. Sanitary sewer inlet and outlet pipes shall be joined to the manhole with a gasketed, flexible, watertight connection or any watertight connection arrangement that allows differential settlement of the pipe and manhole wall to take place. I I I I I (3) Air-entrained concrete shall be used in the production of all units. Air content shall be maintained within the range of 5 to 7 percent. (4) A Certificate. of Compliance shall be furnished with each shipment of precast manhole and catch basin sections stating that the materials furnished have been tested and are in compliance with the specification requirements. (5) Lift holes will not be permitted in precast manholes. D Concrete Concrete for cast-in-place masonry construction shall be produced and furnished in accordance with the requirements of MnlDOT Specification 2461 for the mix designation indicated in the Plans. The requirements for Grade B concrete shall be met where a higher grade is not specified. Type 3 (air-entrained) concrete shall be furnished and used in all structures having weather exposure. I E Mortar I I I Mortar for use in masonry construction shall be an air-entrained mixture of one part Masonry cement, Type S, and two parts mortar sand, with sufficient water to produce proper consistency, and with sufficient air-entraining agent added to maintain an air content within the range of 7 to 10 percent. Mortar shall meet the requirements of ASTM C-270. I 1999 Standard Utilities Specifications Page 49 I I I I I I I I I I I I I I I I I I I When placement or handling precautions prove inadequate, in the Engineer's opinion, the Contractor shall provide and install suitable plugs or caps effectively closing the open ends of each pipe section before it is lowered into laying position, and they shall remain so covered until removal is necessary for connection of an adjoining unit. Unless otherwise permitted by the Engineer, bell and spigot pipe shall be laid with the bell ends facing upgrade and the laying shall start on the downgrade end and proceed upgrade. As each length of bell and spigot pipe is placed in laying position, the spigot end shall be centered in the bell and the pipe forced home and brought to correct line and grade. The pipe shall be secured in place with approved backfill material, which shall be thoroughly compacted by tamping around the pipe to a height of at least 12 inches above the top with hand operated mechanical tamping devices or by hand. The joint areas shall remain exposed and precautions shall be taken to prevent the soil from entering the joint space, until the joint seal is effected. Backfill in the bell area shall be left loose. Connection of pipe to existing lines or previously constructed manholes or catch basins shall be accomplished as shown in the Plans or as otherwise approved by the Engineer. Where necessary to make satisfactory closure or produce the required curvature, grade or alignment deflections at joints shall not exceed that which will assure tight joints and comply with any limitations recommended by the pipe manufacturer. Entrance of foreign matter into pipeline openings shall be prevented at all times to the extent that suitable plugs or covering can be kept in place over the openings without interfering with the installation operations. Installation of thermoplastic pipe shall conform to ASTM D-2321. A3 Connection and Assembly of Joints All pipe and fitting joints shall fit tightly and be fully closed. Spigot ends shall be marked as necessary to indicate the point of complete closure. All joints shall be soil tight, as the minimum requirement, and shall be watertight in all sanitary sewer pipe lines and in all storm sewer pipe lines installed within the limits of a paved street or highway traffic lanes. Where specified, the joints in certain assemblies shall be made structurally integral by being completely encased in concrete to form a rigid watertight unit as indicated in the standard drawings. All joints shall be sealed as follows, subject to such other approved method as the Engineer may authorize as being an acceptable alternative: (1) Concrete pipe and fitting joints - compression type rubber gasket seals conforming to the requirements of ASTM C-443, ASTM C- 3 61 or AASHTO M -l98 for circular pipe, or as otherwise approved by the Engineer in the case of non-circular pipe sections. (2) PVC pipe, and ABS solid wall pipe and fittings assembled gasket seal joints. I I 1999 Standard Utilities Specifications Page 51 I I I lines shall be installed in conformance with all applicable requirements of the main sewer installation and as more specifically provided for herein. I The Engineer, with the assistance of the Contractor, shall keep accurate records of all service installations as to type, lccation, elevation, point of connection and termination, etc. This service record shall be maintained jointly by the Contractor and Engineer on forms provided by the Engineer. The service installations shall not be backfilled until all required information has been obtained and recorded. I I I The main sewer service connection shall consist of installing a Branch Tee or Wye section in the main sewer line at designafed locations or providing an insert type Saddle Tee in a pipe cutout where and as permitted or required in lieu of the built- in fitting. Orientation of service connection fitting shall be as shown in the standard drawings unless otherwise directed by the Engineer. I Where the depth of cover over the main sewer invert is greater than 15 feet (or such other maximum as may be indicated), the service connection shall be extended upward by means of a Service Riser Section in accordance with the details shown in the standard drawings. I Unless otherwise specified, service pipe shall be installed at right angles to the main sewer and at a straight line grade to the property line. The standard and minimum grades shall be a uniform rise of one inch in four feet for sanitary service lines and one inch in eight feet for storm sewer service lines. These minimum grades may be reduced (by not more than one-half pitch) where the Engineer so approves in the case of restrictive elevation differences. I I Building service pipe lines shall generally be kept as deep as required to serve the building elevation and maintain the specified minimum pipe grades. Pipe bends shall be provided as necessary to bring the service lines to proper location and grade. Pipe bends shall not exceed 22- 1/2 degrees with:mt approval of the Engineer. I Unless otherwise indicated, service pipe installation shall terminate at property line or as designated on the Plans, with a gasketed plug placed in the end, at which point the Contractor shall furnish and set a 4 x 4 inch wooden timber 6 feet to 8 feet in length embedded 4 feet below grade, or approved steel post to mark the exact end of pipe. The timber or post shall be set vertically, with the top 2 feet painted green. I I Wherever service line connections to the main sewer are permitted or required to be made by the open cut-out method in the absence of a built- in Tee or Wye fitting, the connection shall be made by using an approved type of Saddle Tee fitting. The pipe cut-out shall be made with an approved type coring machine or by other approved methods producing a uniform, smooth circular cut-out as required for proper fit. The cut-out discs shall be retrieved and shall not be allowed to remain within the main sewer pipe. The Saddle Tee shall be securely fastened to the main sewer pipe by means of epoxy resin or other approved adhesive. The entire connection fitting shall be encased in concrete to a minimum thickness of six inchesmd as may be shown in the standard drawings. I I I 1999 Standard Utilities Specifications Page 53 I I I All annular wall space surrounding the inplace storm sewer pipes shall be completely filled with mortar or concrete, and the inside bottom of each manhole and catch basin shall be shaped with fresh concrete to form free flow through invert troughs as directed. E Reconnecting Existing Facilities I Disposition of abandoned facilities and reconnection of existing facilities shall be as provided for in the Plans, Specifications, and Special Provisions. I I I F Sanitary Sewer Leakag~ Testing All sanitary sewer lines, including service connections, shall be substantially watertight and shall be tested for excessive leakage upon completion and before connections are made to the service by Others. Each test section of the sewer shall be subjected to exfiltration testing, either by hydrostatic or air test method as described below and at the Contractor's option. The requirements set forth for maximum leakage shall be met as a condition for acceptance of the sewer section represented by the test. I If the ground water level is greater than three feet above the invert elevation of the upper manhole and the Engineer so approves, infiltration testing may be allowed in lieu of the exfiltration testing, in which case the allowable leakage shall be the same as would be allowed for the Hydrostatic Test. I I All testing shall be performed by the Contractor without any direct compensation being made therefor, and the Contractor shall furnish all necessary equipment and materials, including plugs and standpipes as required. I Fl Air Test Method I The pipeline shall be sealed with plug whose sealing length is greater than the diameter of the pipe and constructed in such a nature that it will not require external blocking or bracing and maintain a seal against the line's test pressure. I I All wyes, tees, outlets or ends of lateral streets shall be suitably capped and braced to withstand the internal pressures. Such caps or plugs shall be easily removable. I One plug shall be tapped for the air supply hose and the return air pressure hose. The air supply hose, connected from the compressor to the plug shall be a throttling valve, bleeding valve and shut off valve for control. The air pressure tap shall have a sensitive pressure gauge, 0 to lO psi range, protected by a gauge cock and a pressure relief valve set at 10 psi. I I I In performing the test, air is added slowly to the pipeline until pressure inside th~ pipeline reaches 4.0 psi. If air is added too rapidly, the test accuracy will decrease because a change in temperature also has an effect on the change in pressure. When the air pressure inside the pipeline reaches 4.0 psig above external hydrostatic pressure, the suPphi air is stopped. A minimum two-minute time interval is allowed for the temperature diftf.srence to stabilize before I 1999 Standard Utilities Specifications Page 55 I I I I I I I I I I I I I I I I I I I A table for converting water height to gauge pressure is as follows: Groundwater Level over Top of Pip line FEET 1 2 3 4 5 6 7 8 9 Added Pressure to be Applied to Gauge pressure Readings PSIG 0.43 0.86 1.29 1.72 2.16 2.59 3.0l 3.44 3.87 F2 Hydrostatic Test Method After bulkheading the test section, the pipe shall be subjected to a hydrostatic pressure produced by a head of water at a depth of three feet above the invert elevation of the sewer at the manhole of the test section. In areas where ground water exists, this head of water shall be three feet above the existing water table. The water head shall be maintained for a period of one hour during which time it will be presumed that full absorption of the pipe body has taken place, and thereafter for an extended period of one hour the water head shall be maintained as the test period. During the one hour test period, the measured water loss within the test section, including service stubs, shall not exceed the Maximum Allowable Loss (in Gallons Per Hour per 100 Feet of Pipe) given below for the applicable Main Sewer Diameter. Main Sewer Diameter Maximum Allowable Loss* (In Inches) (In Gallons Per Hour Per 100 Feet) 6 0.5 8 0.6 lO 0.8 l2 1 l5 1.2 18 l.4 2l 1.7 24 & Larger 1.9 * Based on 100 Gallons Per Day Per Pipe Diameter Inch.Per Mile I I 1999 Standard Utilities Specifications Page 57 I I 2621.4 METHOD OF MEASlJREMENT I I I All items will be measured separately according to design designation as indicated in the Pay Item name and as may be detailed and defined in the Plans, Specifications, or Special Provisions. Pipe will generally be designated by size (inside diameter or span), strength class, kind or type, and laying condition. Complete- in-place items shall include all component parts thereof as described or required to complete the unit, but excluding any excesses covered by separate Pay Items. Linear measurement of piping will include the running length of any special fittings (tees, wyes, elbows, gates, etc.) installed within the line of measure between specified terminal points. A Sewer Pipe I I I Sewer pipe of each design designation will be measured by length in linear feet along the line of pipe. Terminal points of measurement will be the pipe end at free outlets; the point of connection with inplace pipe; the center of manholes or catch basins; the point of centerline intersections at branch fittings; or the point of juncture with other appurtenances or units as defined. Separation of quantities according to "depth zone classification", when so designated in the Pay Item, will be determined by depth of pipe invert below the ground surface profile. I B Manholes I Manholes of each design designation will be measured by number of each constructed complete- in-place, including the base and castings as required, but excluding any excess depth greater than 8.0 feet measured from top of manhole cover to invert elevation of lowest pipe. I Excess manhole depth of each design designatim will be measured by the linear foot difference in depth between the 8.0 feet allowed as standard and the actual increased depth as constructed. I I I I C Catch Basins Catch basins of each design designation will be measured by number of each constructed complete-in-place, including the base and castings as required, but excluding any excess depth greater than 5.0 feet measured from top of grate (low point) to invert elevation oflowest outlet pIpe. Excess catch basin depth of each design designation will be :treasured by the linear foot difference in depth between the 5.0 feet allowed as standard and the actual increased depth as constructed. D Outside Drop Connection I I Outside drop connections of each design will be measured by number of each construCfed complete-in-place, including granular encasement, fittings, and any special piping details as required, including two holes into existing manholes for the drop connection, but excluding any I I I 1999 Standard Utilities Specifications Page 59 I I I Where the specified standard manhole, catch basin, or outside drop connection depths are exceeded, the excess depth of each design will be paid for separately as linear footage items and payment at the Contract prices therefor shall be compensation in full for all costs of providing the extra depth. I I I I I Special pipe fittings such as wyes, tees and bends will be paid for as separate Contract Items to the extent they are required to be installed in the sewer pipe and service pipe lines and not as a component part of a complete- in-place structure (outside drop connections, service connections, etc.) Appurtenant items such as aprons, trash guards, drainage gates, and other prefabricated units or assemblies and specials as designated will be paid for as separate Contract Items to the extent they are not included as a component part of any complete- in-place structure. I I I I I I I I