Leech_Lake_Sewer_Lining_and_Manhole_RehabilitationA.pdf

SEWER LINING AND MANHOLE REHABILITATION

LEECH LAKE RECREATION AREA

SCOPE OF WORK

1. Scope of Work. This project consists of furnishing all materials, equipment, and labor to line sanitary sewer pipes between the sanitary dump station and the collection manhole and to rehabilitate one manhole in the Leech Lake Recreation Area.

2. Site Visit: The Contractor is encouraged to perform a site inspection before bidding. Site visits may be arranged by contacting Mr. Timm Rennecke, Park Manager, Leech Lake Recreation Area, 01217 Federal Dam Drive NE, Federal Dam, MN 56641, Phone number: (218) 654-3145.

3. Work Schedules: Work may begin as weather permits after the Contractor receives the Notice to Proceed. The Contractor shall submit a plan that details the sequence and scheduling of the proposed work. The work plan shall be submitted within 10 days of contract award. A pre-construction meeting shall be held at Leech Lake Recreation Area before commencing work. The safety and work plan, schedule, and coordination issues shall be discussed.

4. Site Location. The Leech Lake Project is located in mid-central Minnesota approximately 230 miles north of the Minneapolis-St. Paul metropolitan area and about 33 miles west of Grand Rapids, Minnesota. The work site is located in the main campground area of the Leech Lake Project in Cass County, Federal Dam, MN. The location of the specific work area is indicated on the Work Site Location Map. The location of the recreation area is shown on the vicinity map. Both are attached to this document.

5. Sewer Lining Requirements. The requirements for the sewer lining are detailed in the attached section 33 01 90 CURED IN PLACE PIPE LINING SYSTEMS.

6. Manhole Rehabilitation Requirements. The requirements for the rehabilitation of manhole #4 are detailed in the attached section 33 01 30.70 13 MANHOLE

REHABILITATION.

7. Safety. All work shall be performed in accordance with the Corps of Engineers Safety and Health Manual, EM 385-1-1. The Government will provide the Contractor a copy of the manual. The Contractor shall plan work to minimize interruptions of normal traffic flow in the park and maintain special emphases towards visitor safety at all times. The Contractor shall erect a temporary four-foot safety fence around the work areas to keep the public out.

8. Site Restoration and Cleanup. The contractor shall clean up and dispose of all job related debris in accordance with all state and local laws and ordinances. All surface areas damaged by the Contractor operations shall be restored.

9. Attachments:

a. 33 01 30.70 13 MANHOLE REHABILITATION

b. 33 01 90 CURED IN PLACE PIPE LINING SYSTEMS

c. Leech Lake Recreation Area Vicinity Map

d. Leech Lake Recreation Area Site Map

e. PLAN SHEET – UTILITY SYSTEMS GENERAL PLAN

f. PLAN SHEET – UTILITY SYSTEMS SEWER PROFILES

10. Measurement and Payment. Measurement and payment for each bid item is described in the individual specification section covering the work of each bid item.

SEWER LINING AND MANHOLE REHABILITATION

SCOPE OF WORK

BID SCHEDULE

CLIN DESCRIPTION QTY UNIT UNIT PRICE AMOUNT

0001 Mobilization 1 LS **********

0002 Pipeline Cleaning & Television Inspection

806 LF

0003 Pumping and Bypassing of Sewer Flows

1 LS **********

0004 Installation of Liner 806 LF

0005 Post Lining TV Inspection 806 LF

0006 Manhole Rehabilitation 1 LS **********

TOTAL

This page was intentionally left blank for duplex printing.

SECTION 33 01 30.70 13 TOC

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 01 30.70 13

MANHOLE REHABILITATION

PART 1 GENERAL

1.1 REFERENCES

1.2 MANHOLE AND ACCESS

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.5 MANHOLE REHABILITATION WARRANTY

1.6 MEASUREMENT AND PAYMENT

PART 2 PRODUCTS

2.1 INFILTRATION CONTROL MATERIAL

2.2 CEMENTITIOUS MANHOLE LINER

PART 3 EXECUTION

3.1 MANHOLE CLEANING AND PREPARATION

3.2 FILLING OF CRACKS AND VOIDS

3.3 SEALING ACTIVE LEAKS

3.4 MANHOLE SURFACE CONDITION PRIOR TO APPLICATION

3.5 LINER MIXING

3.6 CENTRIFUGAL SPIN CASTING APPLICATION

3.7 TROWELING

3.8 MANHOLE LINER MATERIAL MINIMUM THICKNESS

3.9 COLD WEATHER

SECTION 33 01 30.70 13 Page 1

SECTION 33 01 30.70 13

MANHOLE REHABILITATION

07/10

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM C-109 (2008) Standard Test Method for Compressive Strength of Hydraulic Cement Mortars

ASTM C-293 (2008) Standard Test Method for Flexural Strength of Concrete

(Using Simple Beam with Center-Point Loading)

ASTM C-321 (2005) Standard Test Method for Bond Strength of Chemical Resistant

Mortars

ASTM C-579B (2006) Standard Test Methods for Compressive Strength of Chemical-

Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes

ASTM C-882 (2005e1) Standard Test Method for Bond Strength of Epoxy-Resin

Systems Used With Concrete by Slant Shear

1.2 MANHOLE AND ACCESS

The sanitary sewer manhole to be rehabilitated is referred to as manhole number 4. It is located in a wooded wetland between the dump station and the sewage treatment plant. There is a narrow nature trail that passes close to the manhole, which may be used for access. Some brush clearing may be required to get equipment and materials to the manhole. Temporary fill may be placed if conditions are too wet to get equipment and material into the manhole location with the following stipulations:

SECTION 33 01 30.70 13 Page 2

A. Brush may only be cut to the width needed for access, and only after receiving written approval by the Contracting Officer’s Representative. The Contractor must submit a plan for approval.

B. No stripping of topsoil is allowed in the wetland.

C. All temporary fill material must be removed after the work is complete.

D. When removing temporary fill, existing topsoil shall not be stripped or removed.

E. The nature trail and/or other areas used for access must be restored to pre-project conditions.

F. Mats are preferred over earth fill, but are not required.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Infiltration Control Materials; G, EC-D

Submit manufacturer's standard literature or catalog cuts, and instructions for use and installation.

Manhole Liner Materials; G, EC-D

Submit manufacturer's standard literature or catalog cuts, and instructions for use and installation.

1.4 QUALITY ASSURANCE

1.4.1 Installer Qualifications

Manhole rehabilitation shall be performed in accordance with the requirements herein and in accordance with the recommendations of the material manufacturers. The Contractor shall provide evidence and references for successfully installing the products to be used.

SECTION 33 01 30.70 13 Page 3

1.4.2 Product Requirement for Successful Use

The cementitious grouts and liners used to rehabilitate the manhole(s) shall have documented records of satisfactory performance in similar usage and shall have a manufacturer’s written guarantee of performance for the application of sewer manhole sealing under the conditions described herein and when installed in accordance with the manufacturer’s instructions.

1.5 MANHOLE REHABILITATION WARRANTY

Rehabilitation work performed on the manhole(s) shall be warranted from defects and failure for a period of 5 years from the date of acceptance. If the manhole(s)

1.6 MEASUREMENT AND PAYMENT

The work of this section will not be measured for payment. Payment will be made on a lump sum basis, complete. Payment work described in this section shall constitute full compensation for furnishing all labor, materials, equipment, and incidentals required and performing all work in a satisfactory manner and in accordance with the requirements described herein.

PART 2 PRODUCTS

2.1 INFILTRATION CONTROL MATERIAL

A rapid setting cementitious product specifically formulated for leak control shall be used to stop minor water infiltration and shall have the following minimum properties:

Compressive Strength: ASTM C579B 600 psi, 1 hour 1000 psi, 24 hours Bond ASTM C321 30 psi, 1 hour 80 psi, 24 hours

2.2 CEMENTITIOUS MANHOLE LINER

A cementitious product shall be used to form a structural/structurally enhanced monolithic liner covering all interior substrate surfaces. The cementitious manhole liner shall be specifically designed for rehabilitation of wastewater manholes and shall be a corrosion resistant mortar based on Portland cement fortified with siliceous aggregates and fibers, and shall contain additives to be resistant to sulfuric acid resulting from bacteriological oxidation of hydrogen sulfide common to sanitary sewers, or shall contain anti-bacterial additives designed to prevent

SECTION 33 01 30.70 13 Page 4 the colonization of Thiobacillus bacteria in concentrations sufficient to produce sulfuric acid.

The cementitious mortar shall be of a consistency that will allow placement using low-pressure spray or centrifugal spin casting.

2.2.1 Minimum Physical Properties of Cementitious Manhole Liner

2.2.1.1 Compressive Strength at 28 days (ASTM C109): 9,000 psi

2.2.1.2 Flexural Strength at 28 days (ASTM C293): 1,100 psi

2.2.1.3 Bond Strength (ASTM C882): 1,500 psi

2.2.1.4 Density at Placement: 105 lbs/cf

PART 3 EXECUTION

3.1 MANHOLE CLEANING AND PREPARATION

The floor and interior walls of the manhole shall be thoroughly cleaned by pressure washing and made free of all foreign materials including dirt, grit, roots, grease, sludge and debris. All materials resulting from the cleaning of the manhole shall be removed prior to application of the liner material.

3.2 FILLING OF CRACKS AND VOIDS

Any voids and large crack shall be filled with a patching material as described here-in. Prior to patching, any loose material shall be removed by chipping or other appropriate methods to leave a solid surface for patching material to bind to. Patching material shall be installed in accordance with the manufacturer’s written instructions.

3.3 SEALING ACTIVE LEAKS

All active leaks shall be sealed by the injection of the chemical grout, all holes in the manhole shall be plugged, and all cracks and voids shall be filled prior to installation of the manhole liner.

3.4 MANHOLE SURFACE CONDITION PRIOR TO APPLICATION

The walls of the manhole shall be damp without traces of water droplets or running water prior to application of the liner material.

SECTION 33 01 30.70 13 Page 5

3.5 LINER MIXING

The liner material shall be mixed with potable water in accordance with the written instructions from the liner material manufacturer. Mixing of the liner material shall not commence until the manhole has been properly prepared and the equipment necessary for application is in place and ready to apply the liner.

3.6 CENTRIFUGAL SPIN CASTING APPLICATION

The Cementitious Manhole Liner shall be applied to the walls and chimney by centrifugally spin casting using equipment and methods specifically designed by or approved for use by the liner material manufacturer. The rotating applicator shall be positioned within the center of the manhole at either the top of the manhole chimney or the lowest point corresponding to the junction of the manhole bench and walls. The rotating applicator shall then be initialized and pumping of the material shall commence. As the liner material begins to be applied, the applicator head shall be raised or lowered at a controlled and even speed conducive to providing a uniform material thickness on the manhole walls. Controlled multiple passes shall be made until the specified minimum thickness is attained.

3.7 Spraying

Low velocity spray equipment may be used to facilitate uniform application of the liner material to irregularities within the manhole walls and bench area.

3.7 TROWELING

Troweling of the manhole liner material shall compact the material into the voids and crevices and “set” the bond on the manhole surface. Troweling shall begin immediately following the spray application. Precautions should be taken not to over trowel.

3.8 MANHOLE LINER MATERIAL MINIMUM THICKNESS

The manhole liner shall be applied to a minimum thickness of 1/2 inch.

3.9 COLD WEATHER

No application shall be made when the ambient temperature is less than 40 degrees Fahrenheit and falling, or when freezing temperatures are expected within 24 hours.

--- End of Section ---

SECTION 33 01 90 TOC

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 01 90

CURED IN PLACE PIPE LINING SYSTEMS

1.00 INTRODUCTION

2.00 SITE WORK PREPARATIONS

3.00 LINER AND COMPONENT MATERIALS

4.00 TECHNICAL SPECIFICATIONS

5.00 LINER DESIGN AND SELECTION

6.00 INSTALLATION;

PULL IN PLACE

WATER INVERSION

AIR INVERSION

7.00 MEASUREMENT AND PAYMENT

8.00 CLEANUP

9.00 GENERAL INFORMATION AND WARRANTY

SECTION 33 01 90 Page 1

SECTION 33 01 90

CURED IN PLACE PIPE LINING SYSTEMS

1.0 INTRODUCTION

1.1 INSTALLATION INTRODUCTION

The liner will be impregnated with a thermal setting resin that will completely wet out the soft flexible absorbent tube.

Curing is accomplished by circulating air and steam to cross-link the customized resin into a hard impermeable pipe.

When cured the hardened liner will extend from manhole to manhole in a continuous tight fitting watertight pipe-within a pipe, chemically resistant to sewage gases and materials.

ONLY MANUFACTURER CERTIFIED CONTRACTORS WILL BE ALLOWED

TO INSTALL CURED IN PLACE LINER PIPE.

1.2 INTENTION

The intent of this lining process is to line pipes which are subject to partial structural deterioration, partial distortion, interior corrosion, settling, misalignment, cracking, ex-filtration and infiltration. The liner will withstand long-term external hydrostatic loading.

1.3 PIPES TO BE LINED

The existing pipes to be lined are 6 inch diameter cast iron pipe (C.I.P), which were installed in the mid 1970’s. Portions of the pipes to be lined pass through a wetland, and one of the manholes is located in a wetland. The pipes to be lined extend between manhole #8and Manhole #8A, Manhole #8A and Manhole #4, and between manhole #4 and the collection manhole at the lift station. See attached drawings for locations. The pipe leading to the dump station has a sweep bend at the dump station. The total length of pipe to be lined is approximately 806 feet based on the following dimensions.

Dump Station to Manhole #8 – 108 feet Manhole #8 to Manhole #8A – 97 feet Manhole #8A to Manhole #4 – 301 feet Manhole # 4 to Lift Station – 300 feet

SECTION 33 01 90 Page 2

1.4 SITE CHARACTERISTICS

Manhole # 8 – This manhole is located adjacent to the road in a mowed area near the dump station. Access is good.

Manhole # 8A – Location is unknown but is between manhole #4 and manhole #8.

Dimensions from each manhole are listed above.

Manhole # 4 – Is located in a wooded wetland. Access is limited with trees surrounding the manhole. The water is standing on the surface in the low areas. Access to this manhole will be by the nature trail leading from the game area located west of the manhole and north of the campground road leading to the dump station. This may require clearing brush along the edges of the nature trail.

Collection Manhole at Lift station – The collection manhole at the lift station is located in the equipment storage area off of the south end of the COE shop building. Access is good to this location.

Service Connections – There are no service connections to the pipes to be lined.

1.5 SPECIAL REQUIREMENTS

The dump station must be available for public use on the following days: Saturday, Sunday, and Monday.

The dump station facility and sewer line shall not be out of service for more than a 3 day period without prior approval.

The Contractor shall coordinate with the site manager for the days the sewer line will be closed.

The dump station/sewer line shall not be out of service the week prior to or the week following a holiday.

Flows from 2 other sewer lines entering the collection manhole near the lift station must be maintained at all times. The flows from these lines may be pumped from the next upstream manhole directly into the lift station.

1.6 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SECTION 33 01 90 Page 3

SD-01 Preconstruction Submittals

Contractor Qualifications List of proposed subcontractors; G, RO List of proposed products; G, EC Construction Progress Schedule Manufacturer's Sample Warranty Pre-Lining TV Inspection CD

SD-03 Product Data

Submit the manufacturer’s detailed product data with complete information for the liner, resin, and catalyst materials, physical properties, and dimensions. Also include pre-sizing calculations to demonstrate that the products proposed for use are appropriate for the pipes being lined.

SD-08 Manufacturer's Instructions

Submit the Manufacturer’s recommendations for storage, handling, installation and curing procedures for the pipe lining system.

SD-11 Closeout Submittals

Manufacturer's Warranty Post Lining TV Inspection DVD

2.0 SITE WORK AND PREPARATIONS

2.1 TELEVISION INSPECTION PRIOR TO INSTALLATION

The contractor will be required to perform a television inspection and video recording of the pipeline a maximum of seven (7) days prior to the setting up of the liner insertion equipment at the job site. This inspection will be performed utilizing a radial eye camera, to determine the latest condition of the pipeline. Should the result of this television inspection show a condition different than previously noted, the contractor shall immediately notify the Contracting Officer’s Representative. The video recording shall be submitted on a DVD.

2.2 CLEANING

The contractor shall furnish all labor, materials and equipment and shall do all necessary work to remove and dispose of all debris, silt, and roots in the existing pipeline and manholes.

SECTION 33 01 90 Page 4

2.3 FLOW BYPASSING

The contractor shall provide for the diversion of flow at an existing upstream manhole and pump the flow into an existing downstream manhole. The pump and bypass lines shall be of adequate capacity and size to handle the flow. The proposed bypassing system shall be submitted to the engineer for approval and no work shall commence until such approval is granted.

2. 4 OBSTRUCTION REMOVAL

A high speed rotation hydraulic cutter will be used to cut offset joints, roots or other obstructions in the C.I.P. (cast iron pipe). The cut will be made flush with the wall of the pipe to be restored, and the debris will be pushed down the pipe to the downstream manhole.

If an obstruction cannot be removed by conventional methods or by remotely controlled mechanical equipment, then the contractor shall remove or repair the obstructions by excavation. Such excavation shall be considered as a differing site condition and will be paid in accordance with the Contract Clause entitled CHANGES (FAR 52.243-4).

Excavation must be approved by the Contracting Officer in writing prior to start up.

2.5 PRIOR TO COMMENCING WORK

The contractor will provide submittals on all lining materials and resins and shall furnish manufacturer certification that the liner material complies with the requirements of set forth in this specification. The contractor will provide pre-sizing calculations that demonstrate that the liner has been properly sized to avoid the creation of wrinkles or folds.

2.6 SAFETY

The Contractor shall conform to all work safety requirements of pertinent regulatory agencies, and shall secure the site for the working condition in compliance with the same.

The contractor shall erect such signs and other devices as are necessary for the safety of the work site.

The contractor shall also perform all of the work in accordance with the Corps of Engineers Safety and Health Manual, EM 385-1-1 and applicable OSHA standards.

Emphasis is placed upon the requirements for entering confined spaces and working with steam.

2.7 EXTENSION OF TIME

If the contractor is delayed in the course of the work by act or neglect of the client, or by unexpected problem beyond his control, or by any cause which the Contracting Officer

SECTION 33 01 90 Page 5 shall decide justifies the delay, then the time of completion shall be extended for such a reasonable time as the Contracting Officer and the contractor agree upon.

3.0 LINER AND COMPONENT MATERIALS

3.1 TUBING

The liner tube will consist of one or more layers of flexible needled felt or an equivalent woven or non-woven material.

3.2 GEO MEMBRANE

The needled felt will have a Geo membrane coated on either one or both sides comprised of a minimum thickness of 6 mils.

3.3 RESIN

A premium corrosion resistant isophthalic, thixotropic unsaturated polyester resin. The resin will be specifically formulated for the use in the manufacture of needled felt liners for insertion into sewer and drain line needing repair.

3.4 CATALYST

The catalyst shall be compatible with the resin and the other materials used in the manufacturing of the CIPP. The non-promotes resin shall be catalyzed by the addition of a sufficient catalyst to produce the required physical properties of the cured in place pipe.

4.0 TECHNICAL SPECIFICATIONS

4.1 FINISHED AND CURED LINER PROPERTIES

The material will be capable of carrying resin, be able to withstand installation pressure and curing temperatures, and compatible with the resin system used.

The resin system used will be compatible with the application and pipeline environment and shall be able to cure in the presence or absence of water.

The fully cured in-place liner will meet or exceed the minimum structural standards in the industry.

Industry Specifications

The liner shall conform to the minimal standards as follows.

ASTM F1216-09 Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube.

SECTION 33 01 90 Page 6

ASTM F1743-08 Rehabilitation of Existing Pipelines and Conduits by Pulled-in-Place Installation of Cured-in-Place Thermosetting Resin Pipe (CIPP)

ASTM D5813-04 Standard Specifications for Cured-In-Place Thermosetting Resin Sewer Pipe

ASTM C581 Standard Practice for Determining Chemical Resistance of Thermosetting Resins

ASTM D2990 Standard Test Methods for Tensile, Compressive, Flexural Creep, and Creep Rupture of Plastics

ASTM D638 Test Method for Tensile Properties of Plastic

ASTM D790 Test Method for Tensile Properties for Unreinforced and Reinforced Plastics and Electrical Insulating Materials

ASTM D256 Impact Test

ASTM D638 Barcol Hardness Test

5.0 LINER DESIGN AND SELECTION

The contractor shall furnish, prior to the use of the lining materials, satisfactory written guarantee of his compliance with LINER standards for all materials and techniques being used in the lining process.

5.1 RESIN AND TUBE ACCEPTANCE

At the time of resin impregnation, the entire LINER tube shall be inspected for the defects. The resin shall not contain fillers, except those required for viscosity control, fire retardant, or extension of pot life. Thixotropic agents that do not interfere with visual inspection may be added for viscosity control. Resins may contain pigments, dyes, or colors, which do not interfere with visual inspection of the CIPP or its required properties. Additives may be incorporated that enhance the physical and/or chemical resistance.

The impregnated liner bag shall be transported to and stored at the site in such a manner that it will not be damaged, exposed to direct sunlight, or result in any public safety.

5.2 INSPECTION

The contractor shall arrange a freely accessible place and means so that the LINER pipe and all equipment to be used during the installation, including injection manifolds, gauge stations, steam equipment, winches, etc., can be inspected by the Contracting Officer’s Representative. The contractor shall prepare and inspect all necessary equipment for the

SECTION 33 01 90 Page 7 installation prior to going to the job site. The contractor shall also provide all necessary tools and spare parts as may be required for the most frequently damaged equipment, and shall make sure that said tools and spare parts are available at the site.

5.3 INSPECTION OF LINER

The contractor shall designate a location where the un-cured resin in the original containers and the un-impregnated liner will be impregnated prior to installation. The contractor shall allow the Contracting Officer’s Representative to inspect the materials and chemical impregnation procedure. The quantities of the liquid thermal-setting materials shall be as per manufacturer's standards to provide the lining thickness specified.

6.0 INSTALLATION

6.1 INSTALLATION THROUGH EXISTING MANHOLES

The impregnated liner material shall be inserted through the existing manhole by means of a winch assembly. If the surface is sufficiently rough to cause damage to the impregnated liner material a protector shield may be used to cover the manhole opening and the invert throughout the section to be lined. Next, the impregnated LINER shall be inserted into the existing sewer by a cable attached to the liner and then pulled by a winch.

6.2 PULL IN PLACE

The liner may be drawn into the existing sewer by means of winch cable. With the ends of the liner sealed, the liner will be expanded by compressed air or water. However, the pulling tension shall not exceed more than half of the tensile strength of the liner.

6.3 AIR INFLATION

Initially, compressed air is introduced, inflating and forming the liner material against the inner walls of the pipe to be lined.

6.3 STEAM AND AIR CURING

After the inflation steps are completed, the contractor shall begin the curing process of utilizing the LINER approved heat source. The equipment will be capable of delivering steam to the far end of the liner to uniformly raise the temperature required to effectively cure the resin.

The temperature maintained during the curing period shall be that recommended by the resin manufacturer and approved by the engineer.

SECTION 33 01 90 Page 8

During the curing process the heat source shall be fitted with pressure gauges and thermocouples to continuously monitoring the temperature of the incoming and outgoing heat medium supply. The water, steam or air temperature during the cure period shall meet the resin manufacturer's requirements as measured at the heat source inflow and outflow return lines.

At the engineer's direction, the contractor shall provide standby equipment to maintain the heat source supply throughout the curing process; the contractor shall maintain static head (internal pressure) in the liner greater than the maximum design external water pressure.

The initial cure shall be deemed complete when inspection shows that the exposed liner portions appear hard and sound and the remote temperature sensors indicate that an exothermic has occurred. The cure period shall be of duration recommended by the resin manufacturer as modified to account for length, thickness and diameter of the liner.

The hardened liner has to be cooled to a temperature below 100 degrees F. After reaching the appropriate temperature, the static head in the lined pipe is relieved. This cool-down period shall be used prior to opening the downstream stopper, reconnecting of services and returning normal flow back into the system.

If the cured pipe does not fit tightly against the host pipe at its termination point(s), the voids shall be sealed, by filling them with a resin mixture compatible with the CIPP.

All internal (dry or non-bonded) inflation tubes that are not bonded to the resin impregnated tube prior to installation of the liner tube shall be completely removed from the finished cured-in place liner pipe.

Wrinkles in the finished liner pipe that cause a backwater, reduce the pipe's hydraulic capacity or structural stability or that create voids between the liner and pipe wall will be unacceptable.

All unacceptable sections shall be removed or repaired by a method approved by the engineer at the contractor's expense. Repair methods shall be proposed by the contractor and submitted to the engineer for approval.

6.4 WATER INVERSION

The wet-out tube shall be inserted through an existing manhole or other approved access by means of an inversion process using water with an application of a hydrostatic head sufficient to fully extend it to the next designated manhole or termination point. The tube shall be inserted in the vertical inversion standpipe so that a leak proof seal is created.

The inversion head shall be adjusted to sufficient height to cause the impregnated tube to invert from point of termination and hold the tube tight to the pipe wall, producing dimples at side connections. Care shall be taken during the inversion so as not to over-stress the felt fiber.

SECTION 33 01 90 Page 9

6.5 HEATED WATER CURING

If heated water is used to cure liner, provide a suitable head source, and water recirculation, equipment capable of delivering hot water to the far end of the liner. To quickly and uniformly raise the water temperature in the entire inverted liner to the temperature to commence the exothermic reaction of the resin as determined by the catalyst system employed. The heat source shall be fitted with suitable monitors to gauge the temperatures of the incoming and outgoing water supply to determine when uniform temperature is achieved throughout the length of the liner. Water in the liner shall be raised to a temperature as recommended by the resin manufacturer. Initial cure is deemed to be completed when a uniform temperature as recommended by the resin manufacturer as determined by the water temperature monitors on the heat source, is achieved throughout the length of the liner. The post cured period shall then commence with the heat source shut down but recirculation of the water continued to maintain uniform temperature in the liner. Hot water may be bled out of the system and replaced by clean water at ambient water main temperature to control post cure water complete cure. Time required to cure is a function of the pipeline section diameter and length, an shall be determined by the lining manufacturer's instructions. The curing process should be sufficient to hold the liner tight to the pipe wall and produce dimples at side connections.

After curing, open and drain the line in a manner so a vacuum will not be developed which may damage the installed liner.

6.6 AIR INVERSION

Insert the wet-out tube through an existing manhole or other approved access by means of an inversion process using the application of air pressure sufficient to fully extend it to the next designated manhole or termination point. The tube shall be connected by an attachment at the upper end of the guide chute so that a leakproof seal is created and with the impermeable plastic membranes side out. As the tube enters the guide chute, the tube shall be turned inside out. The inversion air pressure shall be adjusted so that sufficient pressure is provided to cause the impregnated tube to invert from point of termination and hold the tube tight to the pipe wall, producing dimples at side connections. Care shall be taken during the inversion so as not to over stress the woven and non-woven materials.

6.7 HOT AIR

If hot air is used to cure the liner, provide suitable heat source and recirculation equipment to uniformly distribute the heat. The temperature and pressure in the line during the cure period shall be as recommended by the resin manufacturer. Hot air generating equipment shall be equipment with a suitable monitor to gauge the temperature of the outgoing steam. The temperature of the resin being cured shall be monitored by placing gauges between the impregnated tube and the existing pipe at both ends during cure.

Initial cure will occur during temperature heat-up and deemed complete when exposed portions of the new liner appear to be hard and sound and the remote temperature sensor

SECTION 33 01 90 Page 10 indicate 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. Post cure temperature shall be held for a period as recommended by the resin manufacturer. During the post cure time the distribution and control of hot air shall be continued to maintain required temperature. The curing process should be sufficient to hold the liner tight to the wall and produce dimples at side connections. Curing of the liner pipe shall take into account the existing pipe material and size, the resin system and ground conditions, which includes temperature, moisture level and thermal conductivity of soil.

6.8 TRIMMING LINER AT MANHOLES

After the liner has been cured, the contractor will trim any excess liner in the manholes.

6.9 TELEVISION INSPECTION AFTER INSTALLATION

A television inspection and video recording of the newly lined pipe including the restored service connections shall be performed immediately after work is completed. The video recording shall be submitted on a DVD. Should the results of this inspection reveal any defects as defined above, the contractor shall be required to repair or replace these defects as ordered by the Contracting Officer, at no cost to the Government, before the work under the Contract will be considered for substantial completion.

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

7.0 MEASUREMENT AND PAYMENT

Payment of rehabilitation work will be based on the unit price listed in the bid schedule.

This payment shall include full compensation for all labor, equipment, material, tools, and incidentals for successfully completing the work as specified.

7.1 MEASUREMENT

All measurements shall be as specified or made by conventional means with accuracy consistent with field conditions and common practice. Should a discrepancy in measurement exist which is greater than 10%, the item in question shall be re-measured by both the contractor and the Contracting Officer's Representative for verification.

7.2 MEASUREMENT FOR PAYMENT SHALL BE BASED ON THE FOLLOWING

SCHEDULE

MOBILIZATION shall not be measured for payment, and shall be paid for at the lump sum unit price bid.

SECTION 33 01 90 Page 11

PIPELINE CLEANING AND TELEVISION INSPECTION shall be paid for at the unit price bid per linear foot of each size pipe. Measurement of the actual number of feet cleaned shall be made from the center of the manholes. Payment for pipeline cleaning shall include compensation for obstruction removal as described above.

PUMPING AND BYPASSING OF SEWER FLOWS shall not be measured for payment, and shall be paid for at the lump sum unit price bid.

INSTALLATION OF LINER shall be paid for at the unit price bid per foot of liner installed for each size pipe.

POST LINING TV INSPECTION shall be paid for at the unit price bid per linear foot of each size pipe. Measurement of the actual number of feet inspected shall be made from the center of the manholes.

8.0 CLEANUP

After the liner installation has been completed and accepted, the contractor shall clean up the entire project area. The contractor shall dispose of all excess materials and debris not incorporated into the permanent installation in accordance with local laws and regulations.

9.0 GENERAL INFORMATION AND WARRANTY

The contractor shall warrant the liner installation for a period of one year. During the warranty period, any defects that affect the integrity or strength of the pipe shall be repaired at the contractor's expense in a manner mutually agreed upon by the owner and the contractor.

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SEWER LINING

CASS COUNTY, MINNESOTA

VICINITY MAP

SEWER LINING

CASS COUNTY, MINNESOTA

SITE MAP

b6ctrhf1 Line b6ctrhf1 Callout Nature Trail