21169 SX0 ADDENDUM NO. 1.pdf

BALTIMORE COUNTY, MARYLAND

DEPARTMENT OF PUBLIC WORKS & TRANSPORTATION

DIVISION OF CONSTRUCTION CONTRACTS ADMINISTRATION

111 WEST CHESAPEAKE AVENUE

TOWSON, MARYLAND 21204

Contract No. 21169 SX0 Consent Decree Bird River and Bengies Sewershed Rehabilitation

Bird River – Bengies – District 15c6 Job Order No.

231-201-0077-7265

ADDENDUM NO. 1

DATE: 12/29/2021

Contact: Anthony Crews, 410-887-3531, tcrews@baltimorecountymd.gov

To All Bidders

This addendum is hereby made a part of the Proposal and the Special Provisions, and is hereby incorporated into the Contract. Should this addendum conflict with any portion of the Special Provisions, the Proposal, or any prior addenda, this addendum shall supersede and control.

Please note the attached changes, corrections, and/or information in connection with the contract and submit bids and be otherwise governed accordingly.

In the Specifications

Attached to be inserted new pages 165 A – P, Section 2732 – Pipe Rehabilitation By Cured-In- Place Method (CIPP) (Per ASTM F1216).

Attachments – 16

PLEASE SIGN BELOW ACKNOWLEDGING RECEIPT OF THIS

ADDENDUM AND RETURN WITH YOUR BID.

Company Name Signature

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SECTION 2732

PIPE REHABILITATION BY CURED-IN-PLACE METHOD (CIPP) (PER ASTM F1216)

2732.01 DESCRIPTION

2732.01.01 Reference. All applicable requirements of other portions of the Contract Documents apply to the Work of this Section.

2732.01.02 Description of Work. These specifications include requirements for all design, materials, transportation, equipment and labor necessary to rehabilitate deteriorated sections of sewer listed in the contract documents by means of cured-in-place pipe (CIPP) liner, using the inversion and curing of a resin-impregnated tube method, per ASTM F1216. This specification is intended to identify the minimum requirements of the County.

2732.01.03 Submittals After the Notice of Award. The Contractor shall have ten (10) working days after the date of award to submit the following information to the County for review and approval. Failure to do so may be grounds for termination of contract. This shall be in addition to the information required pursuant to Section 2731.

(a) Detailed description of lubricant proposed for inversion process. Lubricant shall be compatible with the County’s and/or City’s wastewater treatment plant operations and pretreatment program.

(b) Certification of resin volume and required 5 to 10% addition.

(c) Certification from resin manufacturer regarding approval of resin dye quantity and type.

(d) Information on the maximum allowable tensile stress for the tube, from the felt manufacturer.

(e) Shop drawings and product data to identify materials of construction (including resins, catalysts, felt, etc.), felt manufacturer, location of the felt manufacturing facility, location of the wet-out facility, etc. All CIPP liner shall be manufactured from this designated wet-out facility throughout the entire Contract unless specifically approved otherwise by the County in writing. Multiple wet-out facilities shall not be allowed. On-site wet out shall not be allowed.

(f) A complete description of the proposed wet-out procedure for the proposed technology.

(g) If requested, wet-out forms with detailed information including, but not limited to, roller gap settings, start times, finish times, gel times, resin injection locations, and any other pertinent data documenting the wet-out for each section of CIPP liner manufactured.

(h) Provide data on the maximum allowable stresses and elongation of the tube during installation and the means in which the Contractor will monitor stress and elongation.

(i) Continuous temperature monitoring system, if required.

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2732.01.04 Submittals After the Notice to Proceed. The Contractor shall submit the information listed below, after the Notice to Proceed, for review and approval. This shall be in addition to the information required pursuant to Section 2731.

(a) Suitable documentation for each liner, indicating manufacturer, trade name, time and date of manufacture, felt thickness, number of layers, diameter, length of liner, resin types, resin content, catalyst, relevant batch numbers, storage limitations and requirements, etc.

(b) CIPP liner curing reports documenting the liner installation for all sewer segments shall be submitted after the notice to proceed. The CIPP liner reports shall document all details of liner installation, including manhole numbers, street names/sewer location, project number, date, time, temperature, curing temperature, curing time, CIPP liner thickness, etc. A sample report shall be submitted to the County for approval prior to the installation of any CIPP lining.

(c) Product Warranty and Certification Form: To insure that all products and materials proposed for use on this project are of the highest quality and specifically designed and manufactured for the intended installation or use, a Product Warranty and Certification Form shall be completed by the rehabilitative product manufacturer(s), manufacturer’s representative or vendor as well as the Cured-In- Place Pipe (CIPP) liner installer certifying that the product(s) they are proposing to use is specifically designed for the intended application, installation and/or function. Failure to complete this form may prevent the product(s) from being used on this project.

2732.01.05 Submittals After Cured-in-Place Pipe Liner Installation. The Contractor shall submit the information listed below after the CIPP liners have been installed. This shall be in addition to the information required pursuant to Section 2731.

(a) If requested, wet-out forms with detailed information including, but not limited to, roller gap settings, start times, finish times, gel times, resin injection locations, and any other pertinent data documenting the wet-out for each section of CIPP liner manufactured.

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PRODUCT WARRANTY AND CERTIFICATION FORM

REFERENCE (PROJECT NAME AND CONTRACT NUMBER):____________________________________

THE UNDERSIGNED HEREBY ATTESTS THAT HE HAS EXAMINED ALL THE REFERENCED PROJECT

INFORMATION, PROJECT INSTALLATION REQUIREMENTS AND THE CONTRACT SPECIFICATIONS

AND HEREBY WARRANTS AND CERTIFIES THAT THE REHABILITATION PRODUCTS THAT THEY

PROPOSE TO FURNISH, DELIVER AND INSTALL FOR THIS PROJECT MEETS OR EXCEEDS THE

REQUIREMENTS OF THESE CONTRACT SPECIFICATIONS, IS SUITABLE FOR THE INTENDED PURPOSE

AND INSTALLATION, AND WILL SATISFACTORILY PERFORM TO THE CRITERIA SPECIFIED. THIS

WARRANTY SHALL BE IN ADDITION TO, AND NOT IN LIEU OF, ALL OTHER WARRANTIES,

EXPRESSED OR IMPLIED.

PRODUCT:________________________________________

MANUFACTURER:_________________________________

Address:

By:_______________________________________

(Typed Name and Title)

(SEAL)

__________________________________________ /s/ ___________________

(Signature) (Date)

The Product Warranty and Certification must be signed by a Principal Person (President, Vice-President, etc.) of the Product's Manufacturer. In the event the manufacturer is not the Supplier then a Principal Person of the Supplier must also sign this form.

MANUFACTURER’S REPRESENTATIVE/VENDOR:_______________________________

By:________________________________________

___________________________________________ /s/ _____________________

The Product Warranty and Certification must be signed by a Principal Person (President, Vice-President, etc.) of the Installation Contractor. In the event the manufacturer is not the Installation Contractor then a Principal Person of the Installation Contractor must also sign this form.

INSTALLATION CONTRACTOR:_______________________________

By:________________________________________

___________________________________________ /s/ ____________________

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2732.02 MATERIALS

2732.02.01 The liner shall generally consist of a corrosion resistant polyester, vinyl ester, or epoxy thermosetting resin, or approved equal, impregnated tubing material consisting of one or more layers (with any layer not less than 1.5mm thick) of flexible non-woven polyester felt or fiberglass fiber. The liner system shall meet the requirements of ASTM F1216, ASTM

F1743, and ASTM D5813 and shall be constructed to absorb and carry resins, withstand inversion pressures and curing temperatures, have sufficient strength to bridge missing pipe, stretch to fit irregular pipe sections, and shall invert smoothly around bends. The felt content of the CIPP liner shall be determined by the Contractor, but shall not exceed 25 percent of the total impregnated liner volume. The liner shall fit tightly to the internal circumference of the existing pipe, and an impermeable, flexible membrane integrally bonded to the internal circumference of the felt, thus forming a smooth, chemically inert internal flow surface. The membrane shall be an appropriate thickness to accommodate the installation and cure conditions and shall not be considered to impart any structural strength to the liner but considered an integral part of the liner system. The membrane (internal liner coating) shall be constructed of a material that is suitable for the liner installation/cure method used by the Contractor. The liner shall be fabricated to a size that when installed will neatly fit the internal circumference of the pipe to be lined. Allowance for longitudinal and circumferential stretching of the liner during installation shall be made by the Contractor. All CIPP linings shall be from a single manufacturer. The cured liner shall have a 50-year life span.

2732.02.02 The resin volume shall be adjusted by adding 5 to 10% excess resin for the change in resin volume due to polymerization and to allow for any migration of resin into the cracks and joints in the original pipe.

2732.02.03 Wall Thickness: The required structural CIPP wall thickness shall be designed in accordance with the guidelines in Appendix X1 of ASTM F1216. The CIPP liner wall thickness design shall be based on fully deteriorated pipe. The Contractor shall provide thickness calculations for approval during shop drawing review. The minimum liner thickness for nominal pipe diameters of 8 to 12 inches shall be 6 mm. Minimum liner thickness for nominal pipe diameters of 14 to 16 inches shall be 7.5 mm. Minimum liner thickness for nominal pipe diameters of 18 inches shall be 9 mm. Liner thicknesses, for nominal pipe diameters of 8 to 18 inches, may be modified with the approval of supporting calculations by the Contractor’s Professional Engineer; however, in no case shall thicknesses be less than previously stated. Liners over 18-inches in diameter shall be designed on a case by case basis by the Contractor’s Professional Engineer, and the design thickness calculations shall be submitted for review. In cases where ovality exceeds 10%, or where pipes are egg or oval shaped, alternative methods of design may be considered by the Engineer. The categories of design parameters noted in Tables 2732-1, 2732-2, and

2732-3 shall be used, unless otherwise directed by the County. The selected thicknesses shall be uniform for each pipe diameter and shall be based on the thickest, most conservative design wall thickness calculated for each diameter.

2732.02.04 Common Design Parameters: Design inputs generally considered to be the same from site to site for a particular project are provided in Table 2732-1.

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Table 2732-1

Common Design Parameters

Safety Factor 2.0

Soil Modulus (1) 700 psi

Soil Density (2) 120 pcf

Notes Table 2732-1:

1. In the absence of site-specific information, the County assumes a soil modulus of 700 psi.

2. In the absence of site-specific information, the County assumes a soil density of 120 pcf.

2732.02.05 Site Specific Parameters: The information listed in Table 2732-2 is specific to each manhole to manhole run of pipe. The Contractor shall use for design the information provided by the County and information the Contractor collects during site visits for each manhole to manhole run.

Table 2732-2

Site-Specific Design Parameters

Ovality Notes 1, 2

Ground Water Depth Above Invert Notes 1, 3

Soil Depth Above Crown Note 1

Live Load Notes 1, 4

Design Condition (Fully Deteriorated) Notes 1, 5

CIPP Thickness Notes 1, 6, 7

Notes Table 2732-2:

1. Design thicknesses and complete site-specific designs, as stated herein, in accordance with ASTM F1216 (Appendix X1), shall be submitted after the Notice of Award.

2. The Contractor shall estimate the ovality by viewing the DVDs/videotapes, data and notes provided in the Contract Documents, and any other information provided by the County.

If DVDs/tapes are not available, and the Contract Plans do not state otherwise, the

Contractor shall assume an ovality of 3%. In cases where the ovality exceeds 10%, the

Contractor may consider employing alternative design methods (such as beam design methods) to determine the pipe thickness, at no additional cost to the County.

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3. In the absence of accurate water table information or high water elevation observed during the site visit (stream, ponds, etc.), the Contractor shall assume a seasonal groundwater elevation of 0 feet below the ground surface.

4. CIPP is subjected to traffic live loads as calculated by AASHTO Standard

Specifications for Highway Bridges, HS20-44 Highway Loading.

5. The Contractor shall assume the pipe segments are fully deteriorated.

6. Thicknesses specified (designed by the Contractor and approved by the County) are the final, in-ground thicknesses required. Measured sample thicknesses will not include polyurethane or polyethylene coatings, any layer of the tube not fully and verifiably impregnated with resin, or any portion of the tube not deemed by the County to be a structural component of the composite.

7. The Contractor must consider any factors necessary to ensure the final, cured-in-place pipe thickness is not less than specified (designed by the Contractor and approved by the

County) above. These factors include any stress applied to the material during transportation, handling, installation and cure; the host pipe’s material type, condition, and configuration; weather (including ambient temperature conditions); and any other factors which are reasonably expected to be found in existing sanitary sewer systems.

2732.02.06 Product-Specific Design Parameters: Certain design inputs vary by manufacturer, processes design, or installation technique. These variables are listed in Table 2732-3 with explanatory notes that follow.

Table 2732-3 Minimum Product-Specific Design Parameters

Minimum Enhancement Factor, K(1) K = 7

Minimum Initial Flexural Strength (ASTM Φs = 4500 psi

D790) (2)

Minimum Initial Flexural Modulus of Es = 350,000 psi

Elasticity (ASTM D790)(2)

Minimum Retention of Properties to Account 50% for Long-Term Effects (3)

Minimum Long-Term Flexural Modulus of EL = 175,000 psi

Elasticity (3)

Notes Table 2732-3:

1. Enhancement factor (K) is the additional buckling or load resistance of the rehabilitation product due to the restraining action of the host pipe. The tighter the fit of the product within the host pipe, the greater the value of K. Third party testing of external hydrostatic loading capacity of restrained pipe samples shall be conducted to verify the enhancement factor, K. The minimum values provided are based on the “Long-Term Structural Behavior of Pipeline Rehabilitation Systems,” Trenchless Technology Center, 1994.

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2. Initial values are defined in ASTM D790. The value indicates minimum strength both in the circumferential and longitudinal direction. The County may, at any time prior to installation, direct the Contractor to make cured samples (according to ASTM F1216) and test them in accordance with the listed ASTM standards to verify initial values of physical properties. In such tests the Contractor’s samples must achieve a 95% pass-rate.

3. The initial flexural modulus is multiplied by the creep factor (or percentage retention) to obtain the long-term values used for design. Long-term values shall be verified by long-term external pressure testing of circular lengths of the pipe material by third-party labs prior to bid (e.g. Trenchless Technology Center - TTC). It is understood that the material’s modulus of elasticity will not change over time; however, by convention the modulus is reduced for design purposes for all plastic pipe sections to account for the reduced ability of plastic pipe to carry loads due to the changes in pipe geometry resulting from the effects of creep over time.

2732.02.07 Resin Content

(a) The resin content of the liner shall be 10-15% by volume greater than the volume of air voids in the felt liner bag.

(b) The resin used shall not contain fillers, except those required for viscosity control, fire retardance, or as required to obtain the necessary pot life. Thixotropic agents which will not interfere with visual inspection may be added for viscosity control.

(c) Dye shall be added to resins to improve visual inspection of the cured liner. The types and quantities of dyes added shall have prior approval from resin manufacturer.

2732.02.08 Chemical Resistance: The corrosion resistance of the resin system shall be tested by the resin manufacturer in accordance with ASTM D543. The result of exposure to the chemical solutions listed below shall produce loss of not more than 20 percent of the initial physical properties when tested in accordance with ASTM D543 for a period of not less than 1 year at a temperature of 73.4 ºF plus or minus 3.6 ºF. For applications other than municipal wastewater, conduct chemical resistance tests with actual samples of the fluid to be transported in the pipe and in accordance with procedures approved by the County. The cured liner shall also be chemically and physically resistant to external exposure of soil bacteria, moisture, roots, and chemical attack that may be due to material in the surrounding ground.

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TABLE 2732-4

CONCENTRATIONS OF CHEMICAL SOLUTIONS

FOR CHEMICAL RESISTANCE TEST

CHEMICAL SOLUTION CONCENTRATION, %

Tap Water (pH 6-9) 100

Nitric Acid 5

Phosphoric Acid 10

Sulfuric Acid 10

Petroleum Hydrocarbon Based

Fuels (e.g. Gasoline, diesel, etc.)

Vegetable Oil1 100

Detergent2 0.1

Soap2 0.1

Domestic Sewage* 100

1.

Cotton seed, corn, or mineral oil

2.

As per ASTM D543

* Contractor to include a written statement that their material and resin combination has been successfully installed in the United States and is chemically resistant to domestic sanitary sewage.

2732.02.09 Manufacture Information

(a) The Contractor shall deliver the uncured resin impregnated liner system to the site.

The bag shall not be impregnated at the site. The application of the resin to the felt tubing (wet-out) shall be conducted under factory conditions and the materials shall be fully protected against UV light, excessive heat, and contamination at all times. The liner system shall be impregnated with resin not more than 72 hours before the proposed time of installation and stored out of direct sunlight at a temperature of less than 30ºF. Continuously monitor liner materials during transport and storage with a temperature recorder and data storage. If requested, the Contractor shall furnish the County with the recorder readings before installation. Material that is exposed to temperatures outside of the manufacturer’s limits will be rejected. The Contractor shall provide all appropriate transport, handling and protection equipment including refrigerated, or otherwise suitably cooled, transport equipment in accordance with the manufacturer’s requirements.

(b) All fabricating and Contractor testing shall be carried out under cover and no materials shall be exposed to the weather until they are ready to be inserted. All materials should be protected from the weather and exposure to ultra-violet light as practicable during the manufacture and installation process.

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(c) Each liner shall be accompanied by suitable documentation indicating manufacturer, trade name, time and date of manufacture, felt thickness, number of layers, diameter, length of liner, resin types, resin content, catalyst, relevant batch numbers, storage limitations and requirements, etc. and this information shall be submitted to the County.

2732.02.10 Preliner.

(a) A preliner may be required to help control infiltration or accommodate other liner installation requirements. The preliner shall be as recommended by CIPP lining system manufacturer. If required for successful installation of the liner, the preliner shall be utilized and installed as part of the CIPP lining process at no additional cost to the CIPP lining work.

2732.02.11 Felt.

(a) Polyester fiber of at least 5 denier, with sufficient needling and cross-lapping to yield a burst strength of 100 pounds/1-inch-wide strip in both the machine and transverse direction. The felt content shall be determined by the Contractor to ensure a cured thickness of liner as determined by the Contractor and approved by the County. The thickness of the cured line may vary (+10%, -5%), and shall not include the thickness of the impermeable inner liner.

2732.02.12 Inside Liner Coating.

(a) To reduce the possibility of pinholes, provide a flexible thermo-plastic material bonded to the inside layer of felt forming a minimum of 0.015-inch pinhole free coating layer. Upon installation, to satisfy the County’s desire to achieve maximum hydraulic conveyance, the coating layer shall be free of all deformities such has blisters and delamination.

2732.02.13 Catalyst.

(a) Catalyst shall be chemically compatible with resin and other materials used in the manufacture of liner as evidenced by the certification by the manufactured. The resin shall be catalyzed by the addition of sufficient catalyst to produce the aforementioned physical properties of the unfilled resin.

(b) The catalyst, if in a powder form, shall be dissolved in an equal weight of the solvent styrene prior to addition to the non-promoted resin.

2732.02.14 Characteristics of the Liquid Resin.

(a) The liquid resin will conform, but not be limited, to the following minimum properties.

Thixotropic Index, min 4.3

2732.02.15 Typical Physical Properties of Polyester Felt Cured Composite Cured at 160° to 180°

(a) The installer shall submit manufacturer data to the County showing that the fully cured composite can conform, but not be limited to, the following minimum structural properties:

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Flexural Strength 4,500 psi min.

Initial Modulus of Elasticity 350,000 psi min.

Barcol Hardness 40 Heat Distortion Temperatures Degrees C 82.5

(b) The inside cavity of the pipe liner shall meet the following specification for a minimum 0.015 inside liner coating:

1. Liner thickness and/or strength shall be designed by the manufacturer to withstand failure, collapse and/or a maximum 5% deflection of the vertical and horizontal diameter against all existing or proposed dead and live loads transferred to proposed liner. Line should also be designed to be structurally self-supporting where any and all missing segments of existing pipe are deteriorated for any length along existing conduit. These areas will be stationed and marked by Video Taping of the existing pipe.

2. The Contractor shall provide the recommended tube thickness designs for each size pipe as noted in the submittals section. Design calculations shall be submitted indicating how the tube thickness dimensions were obtained. A minimum safety factor of 2 shall be used in the tube thickness design calculations. No work will start until liner thickness and strength design calculations have been approved by the County, in writing.

2732.03 CONSTRUCTION REQUIREMENTS

2732.03.01 Lining Procedures.

(a) The Contractor shall be responsible for confirming the length and pipe diameter of the sewer to be lined prior to installation of the liner. The Contractor will not be compensated for liners ordered without confirmation of length, pipe diameter, and field conditions.

(b) The liner shall be installed in accordance with ASTM F1216.

(c) The installation of the liner shall be modified as required to accommodate the existing host pipe material.

(d) The Contractor shall conduct operations in accordance with applicable OSHA standards, including those safety requirements involving work on an elevated platform and entry into a confined space. Take suitable precautions to eliminate hazards to personnel near construction activities when pressurized air is being used.

(e) All service locations shall be measured for location prior to liner installation. All service connection measurements and the clockwise position of the openings shall be recorded in a log to aid in the reinstatement of service connections after lining. The approximate locations of identified active service taps are shown on the Contract

Drawings; however, the Contractor shall determine the exact location and number of service connections by the dye test method or other methods approved by the County.

The Contractor shall accurately field locate existing service connections, whether in service or not. For rehabilitated lines, the Contractor shall use existing service locations to reconnect service lines to new liner, unless otherwise specified on the

Contract Drawings or directed by the County. During the line preparation and work

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(f) A continuous temperature monitoring system is required for all 18” or larger sewer, any sized sewer in locations with significant known groundwater infiltration, or if the pipe is within 50 feet of stream, river or lake. This system shall be installed at the invert of the pipe and be installed per the manufacturer’s recommended procedures. The temperature sensors shall be placed at intervals as recommended by the sensor manufacturer. Additional sensors shall be placed where significant heat sinks are likely or anticipated. The sensors, shall be monitored by a computer using a tamper proof data base that is capable of recording temperatures at the interface of the liner and the host pipe. Temperature monitoring systems shall be

Zia Systems, Vericure by Pipeline Renewal Technologies, or approved equal. The

Contractor is responsible for providing temperature monitoring logs.

(f) In the event of insertion being delayed after impregnation by unexpected site conditions but prior to the start of the insertion process, the Contractor shall store, at his own cost, the liner, for a further period of at least 72 hours, below 30ºF for use when conditions allow.

(g) The liner shall be inverted into the pipeline from a suitable platform located above the manhole or other approved point of inversion. The Contractor shall be allowed to insert the liner using another process, which has been approved by the County.

The free open end of the liner bag shall be firmly secured to the platform and the folded liner passed down a suitably reinforced column to a chute or bend leading to the opening of the pipe to be lined. Insert liner without twisting, cutting, tearing, separating, kinking, gouging, overstressing, resin loss, or double-ups. The loss or discharge of resin, other lining materials, or byproducts downstream is not permitted. Potable water at ambient temperature shall be supplied to the platform at a rate sufficient to cause controlled installation of the liner into the pipeline.

Positive head pressure shall be maintained on the liner during the inversion/installation of the liner.

(h) Liner inversion rate for the inversion method shall not exceed 32 feet per minute and the tail of the liner or the tail tag rope shall be suitably restrained to prevent liner run away, if applicable.

(i) The Contractor shall supply a suitable heat source and recirculation equipment capable of delivering required curing temperature to the far end of the liner to uniformly raise the water temperature in the entire liner, once inverted in the pipeline, above the temperature required to commence the exothermic reaction of the resin as determined by the catalyst system employed.

(j) The heat source shall be fitted with suitable monitors to gauge and record the pressure and temperature of the incoming and outgoing water supply to determine when uniform temperature is achieved throughout the length of the liner. Another such gage shall be placed between the impregnated tube and the pipe invert at the termination to determine the temperatures during cure. Install thermocouples at the top and bottom (12 and 6 o’clock positions) of the liner between the liner and the host pipe. If the liner is installed through manhole structures, gages shall also be placed at each structure.

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(k) Initial cure will occur during temperature heat-up and shall be completed when exposed portions of the new pipe appear to be hard and sound and the remote temperature sensor indicates that the temperature is of a magnitude to realize an exotherm or cure in the resin. After initial cure is reached, the temperature shall be raised to the post-cure temperature recommended by the resin manufacturer. The post-cure temperature shall be held for a period as recommended by the resin manufacturer, during which time the recirculation of the water and cycling of the boiler to maintain the temperature shall continue. The curing of the CIPP must take into account the existing pipe material, the resin system, and ground conditions

(temperature, moisture level, and thermal conductivity of soil).

(l) The curing period shall be carried out under an inversion head to maintain a minimum hoop tension in the liner felt of 1 lb/in2.

(m) If cool-down is to be accomplished by the introduction of cool water into an inversion standpipe to replace the water being drained from a small hole made in the downstream end, cool the hardened pipe to a temperature below 100 degrees F

(38 degrees C) before relieving static head in the inversion standpipe. Ensure that, in the release of the static head, a vacuum will not be produced that could damage the newly installed CIPP liner.

(n) Vent and/or exhaust noxious fumes or odors generated during and remaining after the curing process is completed. This process shall remain in place at all manholes, laterals, etc. until noxious odors have dissipated to an acceptable level in accordance with OSHA requirements for the materials used and there is no more air pollution or potential health hazard left to the general public or the construction workers.

(o) The Contractor shall maintain a curing log of CIPP temperatures at the upstream and downstream manholes during the curing process to document that proper temperatures and cure times have been achieved. The logs shall be required to be submitted to the County.

(p) Invert through Manholes. The invert shall be continuous and smooth through all manholes. If a liner is installed through a manhole, the bottom portion of the liner shall remain and the bench of the manhole shall be grouted and shaped as necessary to support the liner. If the liner terminates on either side of a manhole, the invert shall be built up to remove any flow restrictions and to form a continuous invert through the manhole. The cost of this work shall be included in the unit price bid for the liner.

(q) The finished pipelining shall be continuous over the entire length of an insertion run between two manholes or structures and be as free as commercially practicable from visual defects such as fins, foreign inclusions, dry spots, air bubbles, rips, tears, gouges, pinholes, dimples and delamination. The lining shall be impervious and free of leakage from the pipe to the surrounding ground or from the ground to the inside of the lined pipe. Defects that will impede flow or maintenance equipment will not be permissible. Pinholes and leaking patches will not be allowed. If found they must be repaired per the manufacturer’s recommendations, at the Contractor’s expense.

(r) The inner surface shall be free of cracks and crazing with smooth finish and with an average of not over two pits per 12 inch square, providing the pits are less than

0.12 inch in diameter and not over 0.04 inch deep and are covered with sufficient

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County's opinion will not appreciably decrease the flow characteristics or be the cause of a possible blockage, shall be permissible.

(s) Steam cure of the liner is an acceptable method and shall meet the following requirements:

(1) There shall be manifolds connected at both the inlet and outlet air/steam hoses.

Temperature and pressure sensors shall be located on the inlet manifold. The installation equipment shall include an inlet air/steam hose, air compressor, acceptable steam source, and monitoring and control equipment in accordance with the manufacturer’s recommendations. There shall also be an outlet air/steam hose mounted to a gauge station that has a pressure adjustment valve, temperature gauge, and pressure gauge.

(2) The liner shall be inflated with adequate pressure to hold the liner tightly against the pipe wall. Once the correct pressure is reached, the outlet valve shall be used to maintain this pressure. Positive head pressure shall be maintained on the liner during the inversion/installation of the liner and the liner shall not be allowed to continuously inflate/deflate during the installation.

(3) Once the liner is inflated, the temperature shall be adjusted according to the manufacturer’s recommendations. The temperature shall be monitored by the sensors that are attached to the liner until the recommended temperature is reached. Time, temperatures, and pressures shall be recorded continuously throughout the curing process and submitted to the County at the end of the installation. This log will insure that the proper curing of the liner was carried out.

(4) If recommended by the manufacturer, a post curing steam shall be conducted in order to fully develop the chemical resistance and resin strength of the liner.

(5) The Contractor shall gradually cool the liner down by replacing the steam in the line with air and water, if necessary. The temperature, measured by the sensors attached to the liner, shall be lowered to 90°F or as recommended by the manufacturer.

(6) Once the cure is complete, the manifolds and then the calibration hose shall be detached and removed from the line.

2732.03.02 Testing

(a) The Contractor shall collect representative coupon samples/specimens as described below. At minimum, a coupon shall be collected for each pipe diameter that is lined and each liner thickness, unless otherwise specified in writing by the

County. For every 1,000 linear feet of each diameter of CIPP liner installed for the first 10,000 linear feet, the Contractor shall perform sampling and testing at his expense and shall supply results to the County. The frequency of testing may be reduced as approved by the County after sufficient tests are performed to verify the CIPP liner design, production, and installation procedures. Likewise, the

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Contractor at no additional cost to the County when the required tests show that the installed CIPP liner does not meet the specifications. After the 10,000 feet of acceptable test results are received, the test sample frequency can be reduced to one sample every 2,000 feet of each diameter as long as samples continue to meet all minimum standards and sampling results are received in a timely manner. If a test is not passed, the lining will not be accepted. The Contractor shall stamp or mark the test pieces with the date of manufacture and batch number. These samples shall be paid for under the Pay Item for sanitary sewer rehabilitation, for the respective diameter sizes.

(b) Remove restrained samples of the installed CIPP liner at least 18-inches in length.

The sample shall be captured by installing the CIPP liner through a section of PVC pipe (same diameter as the existing sewer diameter) within the most downstream manhole of the installation and at all intermediate manholes if multiple sewer segments are lined at the same time. The Contractor may elect to cut the sample longitudinally and provide half of the sample to the independent testing laboratory and keep the other half of the sample for additional testing if necessary.

(c) For larger diameter sewers (greater than 18-inches in diameter) the sample should be fabricated from material taken from the tube and the resin/catalyst system used and cured in a clamped mold (flat plate sample method) placed in the downtube when circulating heated water is used, and in the silencer, when steam is used.

(d) Testing shall be performed by an ASTM-certified independent testing laboratory.

The Contractor shall submit to the County the name and location of the independent testing laboratory, a certified statement from the laboratory indicating that they are independent from and not associated with the Contractor in any way, and the ASTM certification for the independent testing laboratory.

(e) All expenses for sampling and testing of the installed liner shall be paid for by the Contractor. The cost of all manufacturer’s testing to qualify products furnished to the project site shall be the responsibility of the Contractor.

(f) Should the County desire to make additional independent tests, the Contractor shall, upon request of the County, furnish any reasonable number of test pieces of raw material samples as the County may require, stamped or marked with the date of manufacture and batch number if applicable.

(g) The test specimen shall be conditioned in accordance with procedure 'A' of ASTM

Designation D618, Standard Practice for Conditioning Plastics for Testing.

(h) The test specimen shall be prepared and physical properties tested in accordance with ASTM F1216, Section 8.1. The properties shall meet or exceed the higher of the values identified in Table 1 of ASTM F1216 and Table 2732-3 of this Specification.

(i) In addition to the testing requirements specified above, the Contractor shall verify that installed thickness of the CIPP is within minus 5 percent and plus 10 percent of the specified thickness. The ASTM-certified independent testing laboratory shall test the samples to determine the installed liner thickness (conditioned and prepared in accordance with ASTM D618 and ASTM D5813, and tested in accordance with ASTM D790).

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2732/15

(j) It is preferred that all samples be shipped to the independent laboratory the same day as installation. At the Contractor’s discretion, samples may be sent in batches but in no case later than 30 days after installation. The results of the measurements for each sample shall be submitted to the County within 30 days of the sample’s ship date to the laboratory. The costs for testing shall be included in the bid price for rehabilitation including the cost of all manufacturer’s testing to qualify products furnished to the project site.

(k) Any CIPP lining that does not meet the specified installed strength and/or thickness requirements, regardless of the amount below the specified requirements, shall be corrected by the Contractor in a manner approved by the County at no additional cost to the County. The County’s decision on how to correct the deficient CIPP liner installations shall be final. Options for correcting deficient CIPP liner installations that will be considered by the County include the following: removal of the existing CIPP liner and re-lining the sewer, open-cut replacement of the sewer from manhole to manhole, or re-lining the sewer with the existing CIPP liner in place.

2732.04 MEASUREMENT AND PAYMENT

2732.04.01 Cured-in-Place Pipe Lining. Measurement for payment will be the actual linear footage installed, measured along the centerline of the pipe. Payment is based on the CIPP thickness required for the deepest flow line of the rehabilitated segment.

(a) Basis of Payment. Payment shall be made at the contract unit price bid per linear foot of pipe rehabilitated. The unit price includes all labor, incidentals, materials, resident notification, flow control as specified in the flow control section of the specifications, preconstruction video taping, confined space entry and equipment, sediment and root removal, debris collection and disposal, removal of protruding service connections (protruding less than ½ inch into the main pipeline), re-establishing lateral service connections, re-establishing drop connections, dewatering, traffic control, infiltration control, excavation/access pits, alterations to existing manholes to accommodate CIPP liner installations, repair of existing manholes following CIPP liner installation, pre- and post-cleaning, pre and post-installation CCTV inspection including submission of videos and television logs, warranty inspections, sealing the liner in the manholes and at service connections, required compliance tests, initial and general backfill and compaction, borrow for backfilling, offsite disposal of unsuitable material, pavement removal and disposal, site cleanup, and all other rehabilitation work, not included under other items, necessary to complete the rehabilitation as specified. Payment for this item does not indicate final acceptance of this item; final acceptance is contingent on the receipt, review, and approval of the Final Acceptance TV Inspection described in Section 2742.

2732.04.02 Mandatory Utilization of Epoxy Vinyl Ester Resin where ordered for use in certain, specific industrial waste areas or areas with high temperature waste will be the actual per inch of nominal pipe inside diameter and per linear foot of cured-in-place pipe lining installed using the epoxy vinyl ester resin.

(a) This item shall only be paid, where specifically ordered in the work order, in addition to the applicable unit prices paid under the sewer rehabilitation items, 165 O Contract No.21169 SX0

2732/16 whether or not the Contractor is otherwise utilizing the epoxy vinyl ester resin.

Each unit price bid will be full compensation for all additional costs of utilizing the epoxy vinyl ester resin. The County will not pay for this item when the

Contractor elects the use of epoxy vinyl ester resin, without specific direction to do so.

END OF SECTION

165 P Contract No.21169 SX0