STORM AND SANITARY SEWER PIPE REHABILITATION BY THE QUADEX STRUCTURAL LINING REHABILITATION SYSTEM

Transcription

1 STORM AND SANITARY SEWER PIPE REHABILITATION BY THE QUADEX STRUCTURAL LINING REHABILITATION SYSTEM OUTLINE PART 1 GENERAL 1.1 Description of Work 1.2 Intent 1.3 Objective 1.4 Work and Components Included 1.5 Applicable ASTM Standards and Specifications 1.6 Safety Equipment and Procedures PART 2 QUALIFICATIONS 2.1 General 2.2 Acceptable Liner Products and Manufacturers 2.3 Manufacturer and Installer Experience 2.4 Qualifying Superintendent and Crew PART 3 GENERAL REQUIREMENTS OF THE STRUCTURAL QM-1S RESTORE LINER 3.1 Reference Specifications 3.2 Materials: QM-1s Restore Liner 3.3 Materials: Packaging and Storage 3.4 Materials: Receipt Procedure PART 4 PIPE DESIGN 4.1 Liner Thickness 4.2 Liner Physical Characteristics 4.3 Minimum Acceptable Liner Thickness (Selected Diameters) PART 5 EQUIPMENT 5.1 Description of Major Equipment 5.2 Equipment Maintenance Schedules PART 6 EXECUTION 6.1 Pipe Cleaning and Preparation 6.2 Sealing Active Leaks

2 6.3 Invert Repair 6.4 Inspections (Pre and Post) 6.5 Identification and Pre-Measurement of Lateral Connections 6.6 Bypass of Flow 6.7 Mixing the QM-1s Restore Lining Material 6.8 Spray Application of QM-1s Restore Lining Material 6.9 Curing of the QM-1s Restore Lining Material 6.10 Termination and Sealing at Manhole Outlets 6.11 Internal Reconnection of Lateral Services 6.12 End of Shift Clean Up Procedures PART 7 QUALITY ASSURANCE AND QUALITY CONTROL 7.1 Quality Control Statement 7.2 Quality Assurance Reports to Management 7.3 Daily Activity Logs 7.4 Equipment Calibration Reports 7.5 Final Inspection 7.6 Sample Preparation and Testing of QM-1s Restore Liner PART 8 PART 9 SUBMITTALS GUARANTEE AND WARRANTY

3 STORM AND SANITARY SEWER PIPE REHABILITATION BY THE QUADEX STRUCTURAL LINING REHABILITATION SYSTEM PART 1 GENERAL 1.1 Description of Work Provide all labor, material and equipment to provide for the structural reconstruction of existing sanitary or storm pipes using an approved structural QM-1s Restore lining system by forming a new pipe within an existing structurally deteriorated pipe, which has generally maintained its original shape. This Specification covers the general requirements for the referenced specifications, QM-1s Restore manufacturer and installer qualifications, submittal and guaranty guidelines, materials, pre-installation and installation procedures, and testing. The QM-1s Restore liner may be spin cast or hand sprayed to various pipe surfaces including: brick, concrete, corrugated metal, clay tile, and various other materials. 1.2 Intent The Quadex System is used to install a QM-1s Restore liner inside storm and sanitary sewer pipes resulting in a structural liner that stops further water infiltration and rebuilds the structure surface. The pipe surface is first cleaned and a structural designed liner is spin cast or manually hand spray applied to the interior surfaces. This specification describes all the work, materials, and equipment required for the purpose of structurally rehabilitating the pipe and stopping water infiltration. A uniform QM-1s liner shall be spin cast applied to a prescribed thickness, to all cleaned interior surfaces. The pipe liner shall extend the full length of the original pipe and shall provide a structurally sound, joint-less new structural pipe within the original pipe. 1.3 Objective The primary objective of this section is to structurally reinforce the existing pipe while stopping excessive infiltration and inflow of extraneous water into the storm or sewer system and thereby reduce sewer overflows and the unnecessary treatment and transport costs associated with inflow/infiltration. It is critical that both the Product and the Installer have the ability to meet or exceed all requirements of the Owner. The secondary objective of this contract is to rehabilitate those sewers on which failure could be very disruptive, hazardous to public health, and/or be very expensive to repair after failure. 1.4 Work and Components Included 1. Pre-Installation Cleaning and TV Inspection of Storm or Sewer Pipes 2. Bypass Pumping 3. Pipe Cleaning and Preparation 4. Application of QM-1s Restore Liner 5. Quality Control Measures 6. Post Rehabilitation Video Taping of Storm or Sewer Pipes

4 1.5 Applicable ASTM and ACI Standards and Specifications Unless revised herein, the Contractor shall follow the latest revision of the practices and standards of the following American Society for Testing and Materials (ASTM) Standards, which are made part of this specification: ASTM Standards: C 109 Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens C 469 Standard Test Method for Static Modulus of Elasticity & Poisson s Ratio of Concrete in Compression C 496 Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens C Standard Test Method for Bond Strength of Epoxy-Resin Systems Used With Concrete by Slant Shear C A Standard Practice for Preparing and Testing Specimens from Shotcrete Test Panels F 2414 Practice for Sealing Sewer Manholes Using Chemical Grouting ACI Standards: ACI 305R-99 Hot Weather Concreting ACI 306R-88 Cold Weather Concreting ACI Certified Concrete Field Testing Technician, Level Safety Equipment and Procedures 1. Because pipes of various sizes and configurations will be encountered, each one must be evaluated as to its status as a confined space, on a case by case basis. The OSHA Regulation Document, CFR 29, Part considers storm and sewer pipes as confined spaces. 2. Employees must have been provided adequate training as either a confined space entrant or attendant. Personnel records showing the date, location and test results of confined space training are available. 3. It is required that employees use a relevant 4-gas detection meter to monitor the air quality of the storm or sewer pipe before entry and are familiar with its operation. 4. Proper Personal Protective Equipment (PPE) will be worn by the field technicians at all times. Proper PPE consists of a hard hat, eye protection (safety glasses, goggles, or a face shield) steel toed boots, and a reflective vest that shall be worn at all times while at the work site. 5. Personnel involved in mixing operations must have on long sleeve shirts, gloves and appropriate dust masks while mixing the powder materials. 6. Personnel that work near the spin cast head must wear eye protection that includes

5 safety glasses as a minimum and a face shield for employees that wear glasses. 7. When working in manholes they must be treated as permit required confined spaces. 8. When working in permit required confined spaces the permit must be fully and properly filled out before any operations begin. 9. The minimum equipment required for Permit Required Confined space entry consists of a fully functional 4-gas monitor with a hose of proper length to sample all levels within the confined space (this includes the lowest level, breathing/work zone, above breathing zone and below the ceiling), a tripod in good working condition having the chains required tostabilize the legs in place, a suitable retraction device in good working order, and harnesses that fits the entrant comfortably. 10. Every effort will be made to minimize the amount of product released into the air during mixing operations. 11. Employees shall treat all waste matter and material removed from a sewer pipe as a contaminated material. All contaminated substances from sanitary sewers such as fallen brick, sand debris, sludge and organic matter must be disposed of in a proper manner. PART 2 QUALIFICATIONS 2.1 General It is the intention of this Specification to set a standard of quality and design for the application of all QM-1s Restore materials used in the rehabilitation of Storm and Sanitary Sewer Pipes. 2.2 Acceptable Structural Liner Manufacturers In order to establish product quality and installation standards, the approved structural Quadex QM-1s Restore liner shall be applied using the Quadex lining system or preapproved equal. Any subsequently approved equal product and process shall strictly adhere to this specification with regard to all standards and requirements. Where discrepancies exist between this specification and the established manufacturer s product and process specifications, THIS SPECIFICATION SHALL GOVERN. Alternate or equal products and processes must be submitted in writing 30 days prior to bid closing. 2.3 Manufacturer and Installer Experience 1. The installing Contractor must certify that the QM-1s Restore liner to be used is the EXACT system for which ALL SUBMITTALS AND CERTIFICATIONS were made. No substitutions will be allowed, and misrepresentations or omissions will be grounds for contract termination with the Contractor waiving any and all claims against the Owner for work performed or costs incurred.

6 2. The Contractor must have installed a minimum of 5000 linear feet of 54 inch diameter pipe or greater of the exact name brand product bid. 3. The Contractor s office and/or domicile from which t he work for THIS CONTRACT will be executed shall provide a list of qualifying experience within 14 days prior to submitting. At a minimum, the Contractor shall provide the following: project name, owner, and contact person, phone number, diameter and length of pipe. ALL PAST REFERENCES PRIOR TO THE BID MUST BE SUBMITTED. Omission of any references may be grounds for disqualification or termination. 2.4 Qualifying Superintendent and Crew 1. The contractor is required to have at least one Qualifying Superintendent on the job during construction activities. The Qualifying Superintendent and crew that will be undertaking the work must meet the experience requirements. 2. The Qualifying Superintendent must have been trained by the pump manufacturers and have received a certificate of completion. This factory certification of completion of the required training is kept on file. The Qualifying Superintendent must be thoroughly familiar with all aspects of the operation including safety and quality control measures. 3. The Qualifying Superintendent shall provide a list of qualifying experience within 14 days prior to contract. All required information, including: project name, owner, and contact person, phone number, diameter and length of pipe and date completed shall be furnished for each project completed. 4. The work crew will have been thoroughly trained in the specific aspects of their jobs. This training includes training received from equipment manufacturers and in-field training. A fully trained field technician shall apply the QM-1s Restore liner. Moreover, the field technician is required to have a good understanding of the work and product usage. Field technicians must demonstrate their ability to improve their skills and be capable of properly cleaning the sanitary storm or sewer pipe, developing a repair strategy for stopping any minor water infiltration, and spray applying the liner to fully rehabilitate the pipe to specified requirements. The trained field technician is required to follow the manufacturer s guidelines and keep in good standing with the product manufacturer. All of the work including the cleaning course of action, furnishing the materials, preparation of the materials and repair area, providing the installation of the materials and the testing method will be accomplished according to the manufacturer s specific recommendations. The field technicians are given their approval and recognition upon successfully completing the appropriate training. PART 3 GENERAL REQUIREMENTS OF THE STRUCTURAL QM-1S RESTORE LINER The finished pipe must be such that when the QM-1s Restore liner sets, the total wall thickness will be homogeneous and monolithic. This structural liner is designed and installed to meet fully deteriorated pipe conditions.

7 3.1 Reference Specifications Installation and material tests of QM-1s Restore liners must meet the minimum requirements demonstrated in the following ASTM standards: Specifications: Centrifugally Cast or Sprayed QM-1s Restore Liner Physical Properties All QM-1s Restore lining material shall conform to the following 28-day minimum physical properties. A. Compressive Strength (ASTM C109) Min. 10, days B. Modulus of Elasticity (ASTM C469) Min. 5,000, days C. Flexural Strength (ASTM C293) Min days D. Bond Strength (ASTM C882) Min psi E. Density Dry Wet pcf pcf. 3.2 Materials: QM-1s Liner 1. The Quadex QM-1s Restore lining material shall be a micro-fiber reinforced ultradense mortar. This material provides a high strength fiber reinforced mortar specifically designed for ease of mechanical pumping, spraying and spin casting. 2. The Quadex QM-1s liner shall not clog spinner heads or spray equipment. The QM-1s Restore liner can also be used to repair, resurface, or rebuild pits, sumps, trenches, tunnels, bridges, piers or any concrete structure that has experienced deterioration. 3. The Quadex QM-1s Restore liner shall be designed to produce a liner with improved compressive and flexural strength, high adhesion to damp surfaces, lower permeability and increased resistance to aggressive chemical attack. 4. This fiber reinforced formula shall be engineered to improve hydraulic abrasion resistance, provide dimensional stability and protect against penetration by substances such as fats, oils, gases, chloride ions found in marine applications,. 3.3 Material: Packaging and Storage Material shall be delivered in packaged and sealed condition and free of moisture. Do not use materials that have been exposed to moisture or there is visible damage to the

8 packaging. The QM-1s Restore is provided in 60 pound bags and 2,000 pound supersacks. 3.4 Material Receipt Process All materials must be inspected upon receipt and properly documented as to the amount of material, the identification of the material by lot numbers, and inspected by the receiving employee. Dates and times along with the shipping company delivering the material should be recorded for possible future reference. See daily log. PART 4 PIPE DESIGN 4.1 Liner Thickness The Contractor shall submit liner thickness calculations to the Engineer for review. These calculations will be performed by a third party registered professional engineer. The structural QM-1s Restore lining rehabilitation system is designed in accordance with a fully deteriorated gravity pipe condition. 4.2 Liner Physical Characteristics The QM-1s Restore liner material shall also conform to the minimum requirements demonstrated in the following table: Physical Properties ASTM Reference Requirements Compressive Strength ASTM C-109 Min. 10, days Modulus of Elasticity ASTM C-469/469M-10 Min. 5,000, days Flexural Strength ASTM C-293 Min days The contractor shall submit his price proposal based on the appropriate length, size, and existing pipe parameters designated in the Proposal Section. The deterioration of sanitary and storm sewers is an on-going process. Should pre-construction inspections reveal the sewers to be in substantially different conditions than those in the design considerations, the contractor shall request such changes in reconstruction liner thickness, supporting such requests with design data. The deviation, if approved, shall be reflected by the appropriate addition or reduction in the unit cost for that size as agreed to by the Owner. 4.3 Minimum Acceptable Pipe Liner Thickness The minimum installed QM-1s Restore liner thickness shall be one and a half inch (1.5). The design calculations provided by a registered professional engineer will determine thicknesses if they are over the one and a half (1.5) inch minimum, as required. The Contractor shall submit his proposed plan for ensuring that the installed QM-1s Restore liner meets the engineer s minimum thickness requirements. The plan shall include the proposed QM-1s Restore liner thickness to be installed.

9 PART 5 EQUIPMENT 5.1 Description of Equipment Major equipment components consist of a generator, an air compressor, a high pressure washer, a high shear mixer and pump assembly as a single unit, a reciprocating high speed spin cast delivery assembly, an electric chain drive retraction system capable of +/- 5% repeatability, and high pressure hoses and couplings. 1. Application equipment should have material feed, high shear mixer and pump as a single operating unit. These three functions should operate as a single synchronized unit. In addition, the application equipment is required to have sensors that maintain uniform operation of all three functions and have the ability to shut down the equipment in the event of interruption of any of the functions. This will ensure consistent delivery of materials over time and distance. 2. Application equipment needs to have visible display for the rate of water addition. This will ensure water/material ratios are known and controlled. Water/material ratio must be monitored and recorded throughout the application process. 3. Application equipment should measure the back pressure on the discharge side of the pump. The change in pressure will alert the operator to any potential changes in flow rates. Do not exceed 25 bars of back pressure. 4. Spinner head needs to be capable of spraying in a both a clock wise and a counter clock wise direction. The change in spin direction achieves superior application by applying the materials at multiple angles, when making multiple applications passes. 5. Spinner head needs to be attached to a reciprocating mechanism to layer the materials. The reciprocating mechanism needs to oscillate the spinner head by a minimum of 6 inches. The multiple layering allows for a more uniform application of the product and achieves higher thickness levels, in a single pass. 6. Retraction system needs to be capable of pulling the spinner head at a minimum rate of 4 inches per minute with no more than +/-5% tolerance. This 5 percent tolerance validation should be performed on a daily basis and be recorded in the daily log. 7. Retraction system needs to have a visible display that monitors the rate of retraction. The rate of retraction and the volume of material discharged are necessary to calculate the thickness of the sprayed materials. 8. The rate of retraction, material discharge volume, dry material usage and length of pipe covered should be monitored and recorded on a daily basis. This is a critical to measure the thickness of material applied. 9. Thickness design calculations must be provided by a registered Professional Engineer.

10 PART 6 EXECUTION 1. All structural rehabilitation of existing storm or sewer pipe will follow the procedures listed below. 2. The Contractor shall carry out his operations in strict accordance with all applicable OSHA standards. Particular attention is drawn to those safety requirements involving work on an elevated platform and entry into a confined space. 3. The Owner will be responsible for locating and accessing all manholes, as required, and provide free access to water hydrants for cleaning and other work items requiring water. 4. All surfaces, which have been damaged by the Contractor s operations, shall be restored to a condition at least equal to that in which they were found immediately prior to the beginning of the Contractor s operations. Suitable materials and methods shall be used for such restoration. The restoration of existing property or structures shall be done as promptly as practicable and shall not be left until the end of the construction period. Compensation for this work will be included in the rehabilitation item to which it pertains. 6.1 Pipe Cleaning and Preparation 1. The floor and interior walls of the pipe shall be thoroughly cleaned and made free of all foreign materials including dirt, grit, roots, grease, sludge and all debris or material that may be attached to the wall or bottom of the pipe. 2. High pressure water blasting with a minimum of 3,500 psi shall be used to clean and free all foreign material within the pipe. 3. When grease and oil are present within the pipe, water may be heated to 200 degrees, or an approved detergent may be added to the water or a dilute solution of muriatic acid may be used integrally with the high pressure cleaning water. 4. All materials resulting from the cleaning of the pipe shall be removed prior to application of the lining material. 5. All loose or defective concrete, brick, or grout, shall be removed to provide an even surface prior to application of the lining material. 6.2 Sealing Active Leaks The work consists of hand applying a dry quick-setting cementitious mix designed to instantly stop running water or seepage in all types of concrete and masonry structures. The contractor shall apply an approved quick-setting mortar in accordance with manufacturer s recommendations. The use of chemical grouts is also an approved method for stopping leaks. The water stop cement shall be Quadex Quad-Plug or preapproved equal.

11 6.3 Invert Repair The work consists of mixing and applying QM-1s Restore or preapproved equal mortar, to fill all large voids and repair inverts prior to spraying or centrifugally casting the pipe. For invert repairs, flow must be restricted. 1. The area to be repaired must be cleaned and free of all debris. 2. Once mixed to proper consistency, the QM-1s Restore lining material shall be shot or hand troweled for invert repairs. Care shall be taken to not apply excessive material in the channel, which could restrict flow. Once applied, the QM-1s Restore lining material shall be smoothed either by hand or trowel in order to facilitate flow. 2. Spray or centrifugal application of the lining material may proceed immediately after invert repairs are completed. 2. In severe conditions, reinforcing wire mesh or rebar may be required in addition to the QM-1s Restore liner. 2. Suitable flowable fill may be used to fill voids or stabilize soils outside of the pipe or in the invert of the pipe. 6.4 Inspections The Contractor s experienced personnel trained in location breaks and obstacles by CCTV inspection shall perform inspection of the sewer pipe. Utilizing a color video inspection system with data recording capabilities, the entire pipe section to be lined shall be recorded on CD or DVD and two (2) copies produced. The interior of the pipe shall be carefully inspected to determine the location of any conditions, which may prevent the proper installation of the liner, and it shall be noted so that these conditions can be corrected. A CD or DVD and suitable log shall be submitted to the Owner. 1. Sewers service connections shall also be TV inspected, which shall identify all service connections, openings, and condition of service connections to main. 2. Utilizing high-pressure jet cleaning equipment, several passes shall be completed to assure that all debris is removed from the pipe. If roots are present, root cutters or mechanical brushes are attached to the jet nozzle and sent through the line to remove all root intrusions. Should equipment other than high-pressure jetting apparatus be needed to remove debris or roots, additional payment will be authorized by the Owner. 6.5 Identification and Pre-Measurement of Lateral Connections A 360-degree Pan-and-Tilt view camera shall be used to inspect the pipe traveling upstream. At each connection the operator will stop and turn the camera lens toward the lateral thereby inspecting the first 8 to 12 inches of the lateral connection. If there remains a doubt as to whether or not the connection is live, additional dye and flush tests shall

12 be performed. It will be the responsibility of the Owner s representatives to review this process live or review the video tapes to verify and approve which lateral connections are to be reinstated. The Owner shall be responsible for determining if connection is active or inactive. For each existing service connection determined by the Owner to be active, the Contractor shall determine the condition of the service connection to the main, make his recommendation for lateral connection repair, and record both items in his log. All lateral locations will be measured from the back wall (opposing wall) of the basis manhole, typically the downstream manhole. 6.6 Bypass of Flow As required for acceptable completion of the work and/or to avoid damages due to sewer spills or overflows, the Contractor shall provide for sewer flow maintenance around the section or sections of pipe designated for rehabilitation. The bypass shall typically be made by plugging the line at an existing upstream structure and pumping the flow into a downstream structure or adjacent system. The pump and bypass lines shall be of adequate capacity and size to handle the anticipated flow Bypassing of sanitary sewerage into the storm water system will not be allowed. For all bypass pumping, pump noise shall be kept to a minimum. 6.7 Mixing the QM-1s Restore Lining Material 1. Contractor shall add the QM-1s Restore material to the batch water not to exceed a 0.11 water/material ratio. Precision metering of water in mixer is required to maintain the strict water to material ratio. It is important to maintain the specified water to polymer ratio throughout the application process. Uniform water to polymer ratio equates to consistent strength. The ability to closely adjust and monitor the addition of water through the use of a sight tube system is required. 2. Mixing water temperatures must be determined before blending operations begin. The mixing water temperature must be recorded in the daily operation log at multiple times throughout the day during the installation process. If water temperatures exceed 80 degrees F, then the water should be chilled to 80 degrees F or lower. The ability to provide mixing water at a consistent temperature is a critical aspect of the mixing and installation process. Industrial electronic chillers are available and should be of a suitable capacity to provide the proper amount of water and at the required temperature. High temperature applications, those greater than 80 degrees F, require the use of water chillers to maintain the water at the proper temperature. 3. The lining material shall be mixed in a high shear mixer. This ensures thorough and uniform mix of water with the material prior to pumping. Begin pumping through an adjustable swing tube pump for continuous delivery to the appropriate application device. 4. The mixing operations must be performed so that the minimum of dust is released into the surrounding environment. 5. This process requires the use of a batch style mixer and a swing tube pump. The

13 batch style mixing, precise metering of water and pump rate eliminates wet/dry and thick/thin variations resulting in a uniform structure regardless of the pumping distance. 6. Multiple spin cast nozzles should be onsite at all times to address any application issues or failure of the nozzle. Multiple nozzles may be required to produce the required depth or finish of the liner surface. 6.8 Spray Application of QM-1s Lining Material 1. The QM-1s Restore lining material delivery hose shall be coupled to a mediumvelocity spray application nozzle. Pumping of the material shall commence and the material shall be atomized by the introduction of air at the nozzle, creating a mediumvelocity spray pattern for material application. 2. A reciprocating head that has a speed adjustment for making multiple position changes per minute is required. The reciprocating head allows the spin cast mechanism and the associated selected nozzle to make multiple passes on the pipe wall in a single pass of the sled assembly. 3. Spraying shall be performed by starting at the pipe end-project location and progressing towards the entrance of the pipe. 4. Begin at downstream side of the pipe, and retract the spin cast assembly at a monitored uniform rate. Just as important as knowing that a consistent amount of water is being added to the mix, the retrieval rate of the spin head must be measureable and constant. At the beginning of each pipe segment the retraction device should be calibrated. The calibration process includes setting the digital readout to the desired retrieval rate (in inches per minute). Then the retrieval chain is laid out and marked to show the distance traveled in two minutes. The rate obtained must be within 5% of the expected speed and can be verified by this process. 5. The Quadex QM-1s Restore liner shall be applied to a specified uniform minimum thickness no less than 1 1/2 inches. 6. The QM-1s Restore delivery hose shall be coupled to a high speed rotating applicator device. The rotating casting applicator shall then be positioned within the center, or positioned higher inside the pipe, as required by the diameter the pipe. 7. The high speed rotating applicator shall then be initialized, and pumping of the material shall commence. As the material begins to be centrifugally cast evenly around the interior of the cavity, the rotating applicator head shall uniformly travel back and forth at or near the center point of the pipe at a controlled frequency conducive to providing a uniform material thickness to the pipe walls. 8. Controlled multiple passes shall then be made, if necessary, until the specified minimum finished thickness is attained. If the procedure is interrupted for any reason, the operator shall arrest the retrieval of the applicator head until flows are

14 recommenced. 9. Material thickness may be verified at any point with a depth gauge and shall be no less than a uniform 1 1/2-inches. If additional material is required at any level, the rotating applicator head shall be placed at the location and application shall recommence until that area meets the required thickness. 10. The lining material shall be applied to a damp surface, with no free water. 11. The medium-velocity spray nozzle and the centrifugal spin casting head may be used in conjunction to facilitate uniform application of the material to irregularities in the contour of the pipe walls. 12. If desired, the liner may be troweled following the spray application. Initial troweling shall be in an upward motion, to compress the material and solidify the pipe wall. Precautions shall be taken not to over-trowel. 13. Proper steps shall be taken to ensure the material is cured in a moist and moderate climate. General underground conditions are usually adequate to meet this curing requirement. However, when situations of dry and/or hot conditions are present, the use of a wind barrier and fogging spray may be required. 14. The liner should not be placed when the ambient temperature is 37 degrees Fahrenheit and falling or when the temperature is anticipated to fall below 32 degrees Fahrenheit during the next 24 hours, unless specific precautions are employed. 15. During extreme hot weather conditions, chilled water must be used to mix the QM- 1s Restore. The QM-1s Restore material should be maintained at a temperature lower than 90 degrees F. 6.9 Curing of the QM-1s Lining Material 1. Follow manufacturer s recommended cure schedule in curing of QM-1s Restore liner. 2. Refer to ACI 305R-99 Hot Weather Concreting. Do not apply liner material when ambient and surface temperatures are 100 F or 35 C and above. Shade the material and prepare the surface to keep it cool. To extend working time, mix the material with cool water or ice-cooled water. Be certain the substrate is saturated surface dry (SSD) before application begins. Proper curing is always required and is particularly important in hot weather. Follow ACI 305R-99 guidelines for the proper use of curing agents. 3. Refer to ACI 306R-88 Cold Weather Concreting. Low-substrate and ambient temperatures slow down the rate of set and strength development. At temperatures below 45 F or 7 C, warm the material and monitor substrate temperatures. Properly ventilate the area when heating. Protect the new liner from freezing.

15 Termination and Sealing at Manhole Outlets Termination of the QM-1s Restore liner at the end of a pipe or manhole shall be completed by hand applying the liner to the outer surface of the pipe or into the interior of the manhole Internal Reconnection of Lateral Services The Contractor shall reopen the existing active connections after the final QM-1s Restore lining pass. Restored openings shall be neatly and smoothly open and without rough edges. Care must be exercised not to damage the QM-1s Restore lining while reinstating the lateral End of Shift Equipment Clean Up Procedures Employees will properly clean and store all equipment used during the days operations. All hoses, fittings, pumps, mixers, spray head equipment, retraction equipment well be cleaned both inside and out. The chain for the retraction device will be pressure washed and then treated with a non hydrocarbon based lubricant. All mixed QM-1s Restore materials will be captured and disposed of properly. PART 7 QUALITY ASSURANCE AND QUALITY CONTROL 7.1 Quality Control Statement It is hereby the stated policy that all services will be performed by the protocol specified including ACI, ASTM, OSHA or other appropriate guidelines. The final results will be of the highest quality possible, delivered on the date promised. All equipment and supplies shall be obtained and maintained in order to produce results of the highest quality while meeting OSHA, ASTM, ACI or other appropriate guidelines. Personnel shall be fully qualified to perform the tasks assigned to them. Continuing education and monitoring of the performance of personnel and equipment will be reviewed by management. Corrective action will be taken immediately if a problem is identified. Quality assurance and quality control objectives are to produce rehabilitated structures of the highest quality. 7.2 Quality Assurance Reports to Management As management is directly involved in daily operation, the QA/QC plan must be strictly followed. This plan calls for the strict adherence of field protocol and the continuing training and monitoring of all field personnel. All rehabilitated structures are inspected and verified at the end of the installation. All pipe inspection reports, including all photographs and video tapes of the completed structure, are returned to the field superintendent and kept in the project file. 7.3 Daily Activity Logs A Quadex Daily Activity Log will be filled out completely anytime a work crew is on site. This log includes listing the personnel present at the site, when they arrived and when they left the site. Important spray data includes the times material was applied and under

16 which atmospheric conditions. The ambient air temperature, the dry powder temperature, the mixing water temperature, and the temperature inside the pipe are all recorded on the daily activity report. The operating conditions are also recorded. These measurements include the water addition rate taken at the meter tube, the retrieval speed of the retraction system and the pump motor speed recorded at the pump. Any special conditions are to be noted in the daily log. 7.4 Equipment Calibration Reports Equipment calibration reports are to be kept in the truck at all times. 7.5 Final Inspection At the completion of the rehabilitation of the sewer mains, a video inspection CD or DVD and log (1 copy of both) of the completed line segments shall be given to the Owner by the Contractor. This inspection shall be performed by a color video inspection system. The finished QM-1s Restore shall be continuous over the entire length of all runs and be free of dry spots. No infiltration of groundwater shall be observed. All service entrances shall be accounted for and shall be unobstructed including all rehabilitated lateral connection repair(s). 7.6 Sample Preparation and Testing of QM-1s Restore Liner Submit the following information to the engineer: Product data, including manufacturer and brand name along with laboratory tests results to verify 28-day compressive strength in accordance with ASTM C 109. The project superintendent will require that samples of the applied material will be taken on a daily basis. The samples may be taken from the pump immediately before discharge into the hose or at the spin caster, if feasible. A minimum of four samples will be obtained as required by ASTM C 109. The samples must be undisturbed for a period of at least 24 hours before they can be transported. The material thickness may be determined by using depth gauges during the spraying process. Another process to determine thickness is to drill into the lined corrugated metal pipes to determine the amount of materials applied to the pipe walls. The depth measurements should be made at three clock positions around the pipe and near both ends and the middle of the pipe. These measurements must be written down in a log book which will be submitted to the client at the end of the project, along with digital photos of the completed pipe. The client or project engineer may request additional testing to be performed. These additional tests should be addressed in writing before the project begins. In some instances clients may request several cores be taken of the pipe into or through the original pipe to determine the thickness applied. Approved geophysical laboratories are available to perform this type of test on a routine basis. The Contractor shall furnish all equipment and personnel necessary to conduct all required sample preparations.

17 PART 8 SUBMITTALS 8.1. Before any field work by the Contractor, the Contractor shall submit to the Owner for his review the following: 1. A fully detailed engineers report submitted by a third party, registered professional engineer. 2. Detailed installation procedures and specific procedures for rehabilitation of sewer mains, storm pipe and various other underground structures. 3. Certified copies of all third party laboratory test reports on materials referred to within this Section in accordance with ASTM or Federal Specification requirements that support the physical characteristics required from the materials After cleaning and TV inspection by the Contractor of all of the proposed mains to be rehabilitated and before beginning any lining of mains, the Contractor shall submit to the Owner for his review the following: 1. DVD or CD and log (1 copy of both) of the Contractor s TV inspection of the pipes to be rehabilitated. 2. Detailed minimum design thickness calculations for the QM-1s Restore liner based on Contractor s TV inspection results After rehabilitation of the pipe, the Contractor shall submit to the Owner/Engineer for his records the following: 1. DVD or CD and log (1 copy of both) of the Contractor s TV inspection of the Completed Work. 2. Test results of samples of QM-1s Restore liner as specified in the contract documents. PART 9 GUARANTEE AND WARRANTY 1. The material shall be unconditionally guaranteed to meet or exceed the design criteria detailed in Part 4 of this Specification Section. 2. The finished QM-1s Restore liner shall be continuous over the entire length of a run and be as free as commercially practicable from visual defects. It shall also meet the test requirements specified in this Section. During the guarantee period, any defects which will affect the integrity or strength of the QM-1s Restore liner, shall be repaired at the Contractor s expense. END OF SECTION