CIPP_Provisions_(1).docx

0330130.72 Cured-In-Place Lining

PART I. GENERAL

Section 1. Scope of Services

1.1 This contract covers the rehabilitation of existing sewers by lining using the following approved process: Cured-in-place pipe (CIPP).

The primary contract objective is the structural and hydraulic renewal of the existing sewer main. This specification pertains to the rehabilitation of main line sewers and lateral connections where applicable.

The project is composed of 15” storm sewers.

In conjunction with rehabilitating the sewer sections and related appurtenances specified in this project, the contractor shall excavate and repair sewer mains as necessary or specified, clean and televise sewers, reconnect existing sewer service connections, and provide all submittals required by this specification. Television inspection includes televising immediately before lining, televising after lining, televising after making repairs to correct liner defects, and televising after rehabilitating lateral connections. Requirements pertaining to these activities are presented in greater detail in the upcoming sections.

All permits associated with this project shall be incidental to the project and included in the cost of lining.

1.2 The contractor shall furnish all labor, components, materials, tools, and appurtenances necessary for the performance and completion of the contract. The contractor shall bear the ultimate responsibility for verifying actual field conditions and reporting any discrepancies prior to bid and construction. Change orders will not be issued during construction based solely on inaccurate information in the bid documents.

1.3 The contractor shall be held fully liable for any damages incurred during the installation of liners that are caused by its negligence or the negligence of its subcontractor(s).

1.5 Patents, Trade Secrets and Copyrights. The contractor shall pay all license fees and royalties and assume all costs incidental to the use in the performance of the work or the incorporation in the work of any invention, design, process, product or device which is the subject of patent rights, trade secrets protection rights, or copyrights held by others. The contractor shall indemnify and hold harmless the owner and engineer and anyone directly or indirectly employed by either of them from and against all claims, damages, losses and expenses (including attorney’s fees and court and arbitration costs) arising out of any infringement of patent rights, trade secret protection rights, or copyrights incident to the use in the performance of the work or resulting from the incorporation in the work of any invention, design, process, product or device not specified in the contract documents, and shall defend all such claims in connection with any alleged infringement of such rights.

Section 2. Compliance and Acceptance -Sewer Rehabilitation and Lateral Sealing

2.1 Compliance with this contract shall be complete when all conditions set forth in these specifications have been met, including but not limited to the following:

The finished liner shall be continuous over the entire length of the structure to structure.

The finished liner shall conform to the walls around the circumference of the existing sewer main.

2.2 Completed point repairs shall have no offsets, open joints, bellies, deposits, protrusions, or defects that may result in the liner failing to meet final acceptance criteria.

2.3 Completed lateral seals shall have no defects that may result in the liner failing to meet final acceptance criteria. The lateral seal shall yield a surface conformal with the sewer wall and the lateral connection wall.

2.4 Defects in the finished liner, which will affect the liner's structural integrity, strength, hydraulic performance, future maintenance access, and overall line performance, shall be repaired or the sewer replaced at the contractor's expense. Any lined section or segment (from structure to structure) exhibiting these defects shall be held for payment until such time repairs have been made to the defective

In situations where a liner defect does not affect structural integrity, reduce capacity, impede flow or create other long-term operational and maintenance issues, the contractor shall not be required to make repairs or incur other penalties if the defect was not caused by the contractor’s negligence or unacceptable work methods. The contractor shall bear full responsibility for providing adequate evidence that the defect was not caused by its own negligence or unacceptable work methods. If any such defects are determined to be caused by the contractor’s negligence, the Project Engineer may assess a deduction to the total payment for the lined section and/or require an increase in the warranty period for the lined pipe section in lieu of requiring a repair. The amount of any deductions incurred on this contract will be determined on acase-by-case basis by taking into account the quantity and severity of the defect(s). The maximum deduction for any given pipe section shall be limited to 25% of the total liner and service lateral reinstatement cost and shall not include line item amounts for cleaning and excavation point repairs. Defects that are deemed by the Project Engineer to create the potential for long-term operational and maintenance issues shall be repaired by the contractor, regardless of the presence or absence of negligence, at the contractor’s expense.

2.5 The contractor shall at no time install a felt/resin liner that does not meet the required thickness specified on the Plans. The minimum final cured wall thickness of the liner shall be within 10 percent of the required thickness specified on the plan. If the liner thickness exceeds the 10 percent allowance, for every 1 percent decrease in thickness (past the 10 percent allowance) the contractor will be penalized 5 percent of the cost of all work at that specific lining location. If the contractor’s liner thickness is less than 87.5 percent of the specified design thickness the contractor shall remove the liner and replace it at the contractor’s expense.

It is the responsibility of the contractor to consider site conditions and their installation process in order to determine the thickness to install.

2.6 Prior to lining, the contractor shall verify manhole depths, section lengths, diameters, slopes and other pertinent information in the field. Contractor is ultimately responsible for confirming all site information

Section 3. Referenced Documents

All work shall also conform to the latest edition of the following specifications:

American Society for Testing and Materials (ASTM) Section ASTM F1216 (Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube), ASTM F1743 (Rehabilitation of Existing Pipelines and Conduits by Pulled-in-Place Installation of Cured-in-Place Thermosetting Resin Pipe (CIPP)), ASTM D5813 (Cured-in-Place Thermosetting Resin Sewer Pipe), ASTM D790 (Test Methods for Flexural Properties of Un-reinforced and Reinforced Plastics and Electrical Insulating Materials), and D2990 (Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics) . These shall pertain to product material, installation, testing, final acceptance, etc. as applicable.

Section 4. CIPP Approved Lining Products for Sewer Rehabilitation

Insituform® Inliner® National Liner®

Section 5. Submittals

5.1 Submittals Required of the Successful Bidder Prior to the Pre-construction Meeting.

A. Name of the competent person(s) and resume(s).

B. Copies of NASSCO Pipeline Assessment and Certification Program (PACP) training certificates for all CCTV inspectors.

C. Site Safety Plan. A complete site safety plan shall be submitted one week prior to the pre-construction meeting and include e site safety plan shall include applicable Material Safety Data Sheets (MSDS) and safety measures to be employed in areas where air pressure/steam curing will be used. Work shall not begin until an approved site safety plan is in place.

D. Materials certification from the manufacturer and contractor. The certificate of compliance shall include the following information:

E. Liner Installation and Curing Plan. This plan shall identify the planned installation (pulled-in-place or inversion using hydrostatic head or air pressure) and curing (circulating hot water or controlled steam) methods for the various liner sections.

5.3 Submittals Required for Pre-construction Meeting.

A. Copy of advanced notification to residents.

B. Management Organization. The contractor shall provide an organization chart depicting the essential organizational elements and senior personnel of its firm and its subcontractor(s) and the functions and interrelationships of the personnel proposed to provide design, engineering, technical support, project management and supervision for this project. The contractor shall provide succinct resumes of the personnel proposed to provide design, engineering, technical support and project management for this project.

5.4 Submittals Required Prior to Lining.

A. Grout mix, set time, and placement procedure. When grouting is required, this shall be submitted for approval at least 72 hours prior to use.

B. Completed cleaning logs.

C. One copy of each entry release as required in Part III, Section 6.

D. One copy of the tube order.

E. Manufacturer’s recommended minimum/maximum pressures for inversion and curing, and resin cure temperature/schedule. Explanation should be included for planned deviations from manufacturer’s recommendations.

5.5 Submittals Required 24 Hours Following Main Line Lining. (Note: this does not include weekends. Items to be submitted from lining operations on a Friday are not required to be submitted until Monday.)

A. Samples, ready for testing. On its log the contractor shall list their sample thickness measurements. The contractor shall subtract the coating liner thickness when providing this result.

B. Pre-lining and post-lining CCTV inspections and logs.

C. One copy of processing records for each installed liner. The records should include logs of incoming and outgoing hot water/steam temperatures and host pipe invert-liner interface temperatures at both ends during the curing period. For steam curing, the records should also include a continuous log of pressure during the cure.

D. Documentation showing the resin name and liner wet out date.

Section 6. Pre-construction Meeting

Following award of the contract and before starting any work, the contractor and its subcontractor(s), Superintendent or Field Contract Manager shall meet with the Project Engineer and Project Manager. The contractor shall be notified of the date, time, and place of the meeting.

Section 7. Close-out Procedures

7.1 Progress Meetings. Project close-out shall be completed in phases, depending on the size of the project. On multiple location projects, the project closeout shall be completed each week, or as required by the MSD Project Manager. The MSD Project Manager shall hold progress meetings, as determined necessary by him. Items covered in the meeting are detailed below.

A. Punch List. The contractor shall assist the MSD Project Manager in preparation and updating of the punch list. This list is a Microsoft Excel document and details all items requiring correction, repair, or improvements in order to be accepted and shall be emailed to the contractor on a weekly basis. Failure to show progress on the punch list may result in a reduction in the number of days per week the contractor may schedule new liner installations and delay of payment until completed to the satisfaction of the MSD Project Manager.

B. Reports and Submittals. Final reports, CCTV inspections and other submittals previously described shall be finalized and submitted (see Part I, subsections 7.5 through 7.7).

C. Review of the status of pay estimates.

7.2 Post-Construction Services. The contractor may be required to provide post-construction services to correct deficiencies in any items that may be identified after substantial completion of the project.

PART III. GENERAL PROVISIONS

Section 1. Maintenance of Traffic

1.2 The contractor shall maintain local traffic at all times during this project in a manner causing the least amount of inconvenience to the property owner. Temporary driveways, temporary roadways, or run-arounds as may be necessary to provide vehicular access to and from the abutting properties shall be constructed, maintained, and subsequently removed by the contractor as directed by the site manager.

1.2 The portion of the pavement not affected by the sewer reconstruction shall be kept clear of all material and equipment.

Section 2. Existing Utilities

2.1 The contractor shall take the necessary precautions for the protection of any utility encountered on the project or the restoration of any utility damaged during the work.

2.2 Supporting and protecting existing water lines, gas mains, telephone conduit, etc., shall be included in payment for the various contract items of work.

2.3 All work required for the maintenance of service of existing utilities shall be done by, and at the expense of the contractor.

2.4 All maintenance, repair, and replacement of existing utilities shall be in accordance with the rules and regulations of the various utility companies having jurisdiction.

2.5 All existing storm sewers, driveway drains, and other surface drain pipes, removed or damaged during construction shall be repaired and reconnected by the contractor.

2.6 It is assumed there are water, gas lines, etc. serving each residence. The contractor shall repair or replace these and any other utilities if damaged at no cost to MSD.

Section 3. Cleanup

The contractor shall keep the work area in an uncluttered condition by the frequent removal of debris. The contractor shall remove all debris and unused material and leave the area in a condition similar to the condition of the area before any work was performed.

Section 4. Property Damage

The contractor shall make repairs immediately if it causes any damage to private or public property. Failure to complete the restoration in a timely manner shall result in the delay of payment for work performed.

PART IV. MATERIALS AND EXECUTION

Section 1. General

1.1 Material and Equipment Acceptance. At the time of manufacture, each lot of pipe, liner, and fittings shall be inspected for defects by the installer.

At the time of delivery, the liner shall be homogeneous throughout, uniform in color, and free of cracks, holes, foreign materials, blisters, kinks, or deleterious faults. Pipes with the aforementioned defects shall be rejected.

The contractor shall furnish and maintain, in good condition, all equipment necessary for proper execution and inspection of the work.

The contractor shall protect, store, and handle the lining material during transportation while on-site and during installation in accordance with manufacturer's recommendations to ensure that the liner material is not damaged.

If any part of the lining material becomes damaged before or during installation, it shall be repaired or replaced at the contractor's expense before proceeding further.

1.2 Marking. Liner shall be marked at an interval not to exceed 5 feet with a coded number, which identifies the manufacturer, date, nominal pipe diameter, and average liner thickness. Marking requirements shall also meet or exceed applicable ASTM standards governing the use of the product.

1.3 Installation Forces. Installation forces and pressures shall be limited so as not to stretch the material longitudinally by more than 5% of the original length. These forces shall also be limited so as not to damage the existing pipe, laterals, or manholes. When pulling in the liner, the contractor shall provide a gauge to measure these forces on each installation.

1.4 Pipe Invert Deterioration. If the invert of the sewer pipe is missing or deteriorated due to contractor cleaning operations, the contractor shall: 1) grout the voided area prior to insertion of the liner, 2) thicken the liner, or 3) point repair the main line (see Part I, Table A). Any depression in the pipe or trough in the invert shall not be acceptable.

End Seal. Liner terminations at manholes shall be trimmed flush with the manhole walls. If the contractor improperly cuts the liner termination point or causes a defect that may impede the flow or prevent proper maintenance of the pipe, the contractor shall remedy that situation at his/her expense. The defect shall be repaired with an epoxy-based resin that is compatible with the liner.

1.5 When lining consecutive sections, the liner may be continuous through the manholes. The liner shall be cut and trimmed flush with the manhole walls and the bench walls.

1.6 Service Connections. The contractor shall not damage or cause further deterioration to existing service connections during the cleaning and lining operation.

Existing sewer service connections shall be reinstated using a closed circuit television camera and a remote controlled cutting device. All service connections shall be reinstated unless they are bulkheaded. The contractor shall make a reasonable effort to confirm the status of questionable connections during the cleaning operation; however, it is not the intent of this specification to require excessive effort to perform this task (i.e.; additional mobilizations during odd hours for the sole purpose of dye testing). .

When the service connection is re-established, the invert of the service connection shall match the bottom of the reinstated service opening. The service shall be reinstated to a minimum of 95% of the original service connection. In the case where the host lateral material is PVC or is a break-in tap, the lateral openings shall be reinstated to a minimum of 85% of the original opening.

The sewer service connection cuts shall be uniform and free of burrs and sharp edges. All sewer service connections shall be “brushed” after reinstatement. Any remedial work to repair a deficient cut shall be at the contractor’s expense.

After laterals have been cut, the sewer main shall be flushed and all the coupons from the cut laterals shall be retrieved and properly disposed of by the contractor.

Section 2. Materials and Installation Procedures

2.1 The contractor shall provide the following materials for the performance of work under this contract: A. Cured-in-place Pipe (CIPP)

1. Material Composition. The resin system shall be a corrosion resistant polyester or vinyl ester system including all required catalysts, initiators that when cured within the tube create a composite that satisfies the requirements of ASTM F1216, ASTM D5813 and ASTM F1743, the physical properties herein, and those which are to be utilized in the submitted and approved design of the CIPP for this project. The resin shall produce a CIPP that will comply with the structural and chemical resistance requirements of this specification.

2. Installation Procedure. The contractor shall follow applicable processing parameters in accordance with the manufacturer’s specific specifications, instructions, and design. The general procedure to install CIPP shall be in general accordance with the appropriate current ASTM Standards and as follows:

a) The outside diameter (OD) of the tube shall be sized correctly allowing stretch to fill the existing pipe completely. The existing pipe shall be cleaned of any obstructions or debris and televised prior to tube insertion.

b) The wet-out tube shall be inserted through an existing manhole or approved access point by inversion using the application of a hydrostatic head or air pressure, or pulled-in-place and secondarily inflated through the inversion of a calibration hose by the use of a hydrostatic head or air pressure. The hydrostatic head or air pressure shall be sufficient to fully extend the wet-out tube to the next designated manhole or termination point. Appropriate gauges shall be used to monitor and record the installation forces and pressures. The placement procedure shall be required to produce dimples at the service connections.

c) Curing. After placement is completed, a suitable heat or steam generating source and distribution equipment shall be required to distribute and re-circulate hot water or steam throughout the entire pipe. Temperature and pressure shall be maintained during the curing period as recommended by the resin manufacturer. The heat or steam generating equipment shall be fitted with suitable gauges to monitor the temperature of the incoming and outgoing hot water or steam. At a minimum, temperature sensors shall also be placed between the liner and host-pipe invert at both ends to monitor cure temperature.

d) After adequate cooling and careful release of the water or air pressure, both ends of the liner shall be cut off in the manholes, and live services reinstated.

PART V. CONSTRUCTION REQUIREMENTS

Section 1. General

1.1 Access to Sewer. Access to sewer to be lined shall be through existing manholes or through access pit excavations.

1.2 Bypassing Sewage Flow. Bypassing sewage flow around the section(s) of sewer to be lined shall be performed by plugging the existing upstream manhole or adjacent sewer system and pumping the sewage to the next unaffected downstream manhole. Pump and bypass lines shall be of adequate capacity and size to handle the flow without sewer backup. Hoses and fittings shall be in good condition, without holes, so as not to cause sewage spills. Sewer service connections within the section to be lined shall be maintained by the contractor as required or temporarily taken out of service to permit lining. The contractor shall be responsible for the continuity of sewage flows and sewer service to each facility connected to the sewer section being lined during the execution of the work. If sewage overflows or backup occurs and enters buildings, the contractor shall notify the MSD Project Manager immediately. The contractor shall be responsible for cleanup, repair, and property damage costs and claims. The contractor and its subcontractor(s) shall coordinate setup to minimize duplicating bypassing efforts.

1.3 Maintaining Flow. It shall be the responsibility of the contractor, throughout the tenure of this contract, to provide and maintain sufficient flow at all times to pass any flash of storm flow of drainage ditches and prevent any backwater flooding due to obstruction caused by construction equipment or materials. The contractor shall be responsible for prohibiting storm or subsurface water from entering the sanitary sewer during lining operations as may be caused by flash floods, high creek waters, heavy rains, etc.

1.4 Retrieval of Materials and Equipment. It shall be the contractor's responsibility to remove materials and equipment that have been lodged in the sewer from cleaning, television inspection, excavations, or rehabilitation operations. If excavation is required, the contractor is responsible for excavation and subsequent repair to prepare the sewer for the liner. Point repairs shall not be measured for payment and are considered incidental to the contract.

Jeffersonville Sinkhole Repairs PBS Region 5 Jeffersonville Federal Center, Jeffersonville, In

1.5 Method of Construction. The contractor shall describe method of placement, including a drawing for each location to be lined. The drawing shall show access manholes; sewage bypass; traffic control; site specific hazards; and excavation locations, if required, with dimensions, interfering utilities, detailing the width and length of working area, access pit, limits of sheeting required, and the portion of existing sewer which shall be removed to conduct the work; and applicable erosion control plan(s).

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Section 2. Sewer Cleaning

2.1 The contractor shall clean every segment of sewer main that is to be lined. Compliance with this section requires substantial effort towards cleaning, chipping, cutting, grinding, etc. to remove hardened deposits, protruding laterals, roots, solids, and other matter. The contractor shall clear the sewer of protruding service connections, crushed or collapsed pipe, and other obstructions that shall prevent installation and cause damage to the liner, and shall not provide a final lined pipe until such cleaning has been completed. The contractor shall provide sewer cleaning equipment that is specifically designed and constructed for sewer cleaning.

2.2 The upstream and downstream manhole inverts of each sewer section lined must be clean prior to leaving the jobsite. The rehabilitation process shall not be considered completed until the inverts of the manholes have been cleaned to the satisfaction of the project manager or his representative. Cleaning of the inverts shall be included in the rehabilitation unit price. Disposal of the debris removed is the contractor’s responsibility.

The contractor shall have a CCTV camera in the sewer during all cleaning operations that involve cutting protruding break-in services, deposit removal and/or any other types of cleaning that may cause additional damage to the sewer. The video generated shall be used as the contractor's verification that the cleaning equipment is not damaging the sewer. No submittal is required for this item and the cost for monitoring the cleaning operation shall be included in the associated unit cost for the cleaning item. This in no way waives the contractor's responsibilities for preventing further damage to the sewer. The intent is to make the contractor aware of potentially destructive cleaning operations in order to stop any such operations before additional damage is caused to the sewer. The contractor will be held fully liable for any damages that are caused by his or her negligence.

Solids and debris resulting from the cleaning operation shall be collected and removed from the downstream manhole. The contractor shall be held responsible for any debris that washes into other sections of sewer. The contractor shall assume all and complete responsibility for the legal and proper disposal of the debris. Under no circumstances shall sewage solids be dumped onto the surface, street, or into ditches, inlets, or storm drains. Any cleaning required following a point repair would be incidental to the contract and not measured for payment.

2.3 When lining consecutive sections, the contractor shall clear the manhole channel of any debris or protrusions as described above.

Section 3. Television Inspection

3.1 The contractor shall use a color pan and tilt, rotating head camera specifically designed and constructed for performing sewer inspection work. All submitted video shall be of high quality and in focus. Lighting for the camera shall provide a clear picture of the entire periphery of the existing sewer. The camera shall pause at service connections and pipe ends to evaluate the water tightness of the openings.

Each sewer to be televised shall be suitably isolated to eliminate or control flow during video inspection to allow for the entire circumference of the pipe to be viewed. Any flow control to remove standing water and debris shall be incidental to the contract. This may require the contractor to delay any video work after major rain events until the system can return to low dry weather flow levels.

The final footage for all CCTV inspection work shall be within +/- 4 (four) feet of the measured lineal footage between manholes along the existing sewer centerline between the center of each manhole. Work not following these specifications may be rejected for payment and the contractor may be required to re-do the work.

The documentation of all CCTV work shall consist of PACP CCTV reports, unmodified PACP databases, logs, electronic reports, etc. noting important features encountered during the inspection. The speed of travel shall be slow enough to inspect each pipe joint, service lateral connection, structural deterioration, infiltration and inflow sources, and deposits, but should not, at any time, be faster than 30 feet per minute. The camera must be centered in the pipe to provide accurate distance measurements to provide exact locations of important features in the sewer, and these footage measurements shall be displayed and documented on the video.

Current PACP certification shall be required for all personnel performing CCTV inspection work .

3.2 All software used to perform and log CCTV inspection work shall be PACP certified by NASSCO.

3.3 All CCTV Work to be performed via this contract shall conform to all current PACP and LACP standards, as appropriate. These standards include, but are not limited to: speed of camera travel, coding of defects/structural features/observations, panning of defects/structural features, camera lighting, header information, flow control, and reversal inspections.

Additionally, all CCTV Work to be performed via this contract shall be carried out utilizing a color pan and tilt rotating head camera specifically designed and constructed for sewer inspection. All CCTV work shall be recorded entirely in digital MPEG-1 format with an appropriate PACP/LACP database file (NASSCO PACP/LACP V6.0 Certified Access Database), and all video must be continuously metered.

3.4 Pre-television Inspection Immediately Prior to Lining. After the sewer section to be lined is cleaned, the host pipe shall be internally inspected.

3.5 Post-television Inspection. After the new liner pipe is in place and service connections re-opened, the liner shall be internally inspected. The post-lining inspection shall show all reinstated service laterals and the end seals at each manhole entrance and exit. The contractor shall provide a copy of the post-lining inspection and associated paperwork within 24 hours after lining a pipe section.

3.7 Televising After Making Repairs to Correct Liner Defects. After the main line is lined the contractor shall follow the current requirements of the specifications (i.e., flow control, panning each tap, etc.).

During the review of the post-lining video (and the contractor) will, on occasion, observe a defect(s) that must go on the punch list (i.e., wrinkles, bumps, pilot holes, etc.). After the punch list item is identified the contractor shall make the repair and re-televise the entire main line per PACP standards. When televising the repaired defect(s), the contractor shall provide with a clear view of the repaired defect(s) on the CCTV inspection that enables the video reviewer to easily determine if the defect has been adequately addressed.

3.8 Televising After Rehabilitating Lateral Connection(s). After the lateral connection(s) is rehabilitated the contractor shall wait at least two weeks to perform the post-rehabilitation inspection. The contractor may perform the televising.

PART VI. QUALITY ASSURANCE

Section 1. Liner Sampling and Testing

1.1 The contractor shall make pipe samples according to the specifications below. These samples shall be made according to ASTM Specifications. These samples may be sent to an independent third party laboratory approved by the Engineer.

1.2 Main Line Sewers Less Than or Equal to 15”. In main line sewers of diameters less than or equal to 15”, a restrained sample shall be collected at the downstream manhole. The restrained sample shall be obtained as follows:

Place the pipe sample horizontally in the downstream manhole channel.

Pipe samples shall be initiated through a like diameter pipe.

The downstream pipe sample shall be held in place by a suitable heat sink, such as sand bags.

The samples shall be large enough to provide a minimum of three specimens and a recommended five specimens for flexural testing, or a minimum of 12”x12”.

If a plate is used for sampling, spacers shall be used and properly adjusted to match the inside diameter of the host pipe being lined.

1.2.1 Priority of Samples. Collection of a downstream restrained sample is the first priority (see Section 1.2).

If the contractor is unable to obtain a downstream restrained sample, the contractor shall obtain an upstream restrained sample. The upstream restrained sample shall be collected by placing one pipe sample on the downtube through like diameter pipe.

If the contractor is unable to obtain either a downstream or an upstream restrained sample, then the contractor shall obtain an upstream and a downstream unrestrained sample at that location.

1.2.2 Thickness Transitions. When a thickness transition occurs in a segment, the contractor shall obtain an upstream and a downstream restrained sample.

1.2.3 Lining Through a Middle Manhole. When lining through a middle manhole, the contractor shall obtain restrained samples at the upstream and downstream manholes and an unrestrained sample in the middle manhole. However, if the liner is of a uniform thickness throughout the sections, then only the downstream restrained sample is required.

1.3 Main Line Sewers Greater than 15”. The contractor shall not be required to collect samples except at the direction of the Project Manager or Owner representative. If samples are required they should conform to the following guidelines:

1.3.1 Collect a plate sample and an upstream and a downstream unrestrained sample.

Plate samples shall be fabricated on-site and cured in a clamp mold placed in the downtube. The liner material shall be cut from the bag being installed on the day of lining.

Spacers shall be used, and properly adjusted to match the inside diameter of the host pipe being lined. If spacers are not used, or adjusted properly. The samples shall be large enough to provide a minimum of three specimens and a recommended five specimens for flexural testing, or a minimum of 12”x12”.

1.3.2 Lining Through a Middle Manhole. When lining through a middle manhole, the contractor shall obtain unrestrained samples at all manholes, along with the plate sample.

1.4 Thickness Measurements. Verification of the installed tube thickness shall be determined by measuring the thickness of the available samples using a calibrated measuring device. A minimum of four (4) readings shall be taken from each sample (minus the coating thickness provided by the bidder) and the mean value of all readings shall be used. The sample thickness shall be acceptable if it meets or exceeds 90% of the design minimum wall thickness specified. Penalties assessed to the contractor for failing to obtain 90% of the design thickness are described in Part I, subsection 4.5.

1.5 Physical Testing. Flexural strength and modulus of elasticity shall be determined in accordance with test method ASTM D790.

1.6 Samples shall be measured in the field by the Inspector at the time of lining. If a sample is required but not provided, the contractor shall incur a deduct as specified in Part VI, Section 1.3.3.

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