B09_CHOH_245002_287711_Amd_5_-_330125_SEWER_LINING_CIPP_0005.pdf

CHOH – 245002 & 287711 330125 - 1

SEWER LINING CIPP

SECTION 330125 – SEWER LINING CIPP

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Provide all labor, tools, materials, equipment, and supervision necessary to install Cured-in-Place Pipe (CIPP) including, but not limited to installing CIPP system, trimming protruding Laterals, reconnecting Laterals, preliners, grouting, performing quality control, taking samples, and testing product, and reinstating existing connections.

1.3 REFERENCED CODES AND STANDARDS:

A. ASTM International (ASTM):

1. ASTM C581: “Standard Practice for Determining Chemical Resistance of Thermosetting

Resins Used in Glass Fiber Reinforced Structures, Intended for Liquid Service”.

2. ASTM D543: “Standard Practices for Evaluating the Resistance of Plastics to Chemical

Reagents”.

3. ASTM D790: “Standard Test Methods for Flexural Properties of Unreinforced and

Reinforced Plastics and Electrical Insulating Materials”.

4. ASTM D3567: “Standard Practice for Determining Dimensions of “Fiberglass” (Glass-Fiber-

Reinforced Thermosetting Resin) Pipe and Fittings”.

5. ASTM D5813: “Standard Specification for Cured-In-Place Thermosetting Resin Sewer

Piping Systems”.

6. ASTM F1216: “Standard Practice for Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube”.

7. ASTM F1743: “Standard Practice for Rehabilitation of Existing Pipelines and Conduits by

Pulled-In-Place Installation of Cured-in-Place Thermosetting Resin Pipe (CIPP)”.

8. ASTM F2019: “Standard Practice for Rehabilitation of Existing Pipelines and Conduits by the Pulled in Place Installation of Glass Reinforced Plastic (GRP) Cured-in-Place

Thermosetting Resin Pipe (CIPP)”.

1.4 DEFINITIONS

A. CIPP: Cured-in-Place Pipe (CIPP) is a resin-impregnated flexible tube that is either inverted or pulled into a pipeline/conduit and expanded to fit tightly against said pipeline by using water or air pressure. The resin system is cured to create a continuous and tight fitting pipeline by either:

1. Elevating the temperature of the fluid (water/air), used to inflate the pipe, to a sufficient level for the initiators in the resin to create a thermosetting reaction, or

2. Using ultraviolet (UV) light to create a thermosetting resin.

CHOH – 245002 & 287711 330125 - 2

B. CIPP Installer: The firm who installs the CIPP system. The CIPP Installer could be the

Contractor.

C. Manufacturer: Manufacturer of the CIPP System, which includes the fabric tube, the resin system, and other components as needed for CIPP installation.

D. Reach: A length of pipe between two points containing a specified feature; usually manholes.

E. NPS: National Park Service

F. EPA: Environmental Protection Agency

G. MDE: Maryland Department of the Environment

1.5 WARRANTY:

A. The Contractor shall provide a Warranty for all Work for a period of one (1) year from the date of

Substantial Completion.

B. During the Warranty period, Government may inspect the installed CIPP. The Contractor will be notified a minimum of fourteen (14) days prior to the inspection and is invited to attend.

C. At any point prior to the end of the Warranty, if the CIPP has defects as defined in the Table in

Paragraph 3.9, the defects shall be remedied by the Contractor at the Contractor’s expense.

1.6 SUBMITTALS

A. Requirements for ‘Submittals’ shall be in accordance with Section 01 33 23.

B. Submit qualification documentation for:

1. Manufacturer.

2. CIPP Installer.

Field Superintendent for the CIPP Installer.

C. Submit the following Manufacturer’s information:

1. Certification that the materials to be used meet the requirements of ASTM F1216 and/or

ASTM D5813.

2. Recommendations for shipping, storage, and handling of all components of the CIPP system.

3. Recommended pressures, temperatures, and durations for insertion, heat up, curing, and cool down phases.

4. Product data and instructions for resin and catalyst system, including:

a. Short-term (Initial) Flexural Modulus, Long-term (50-year) Flexural Modulus, and

Flexural Strength Testing Data in accordance with the appropriate ASTM Standard.

b. Safety Data Sheets.

5. Product data and instructions for felt and/or fiberglass tube and sealing materials.

D. Submit the following:

CHOH – 245002 & 287711 330125 - 3

1. Work Plan.

2. Disposal Plan.

3. Design Calculations.

4. Quality Control Plan.

5. Styrene Management Plan.

E. Submit the following documentation the same day as the CIPP installation:

1. Wet-out report when wet-out is performed on site.

2. Curing logs.

F. Submit the pre-construction and post-construction CCTV inspection documentation within 14 days of the CIPP Installation.

1.7 QUALITY ASSURANCE

A. Qualifications and Experience:

1. Provide evidence and documentation demonstrating the minimum qualifications for the

Manufacturer, CIPP Installer, and CIPP Installer Field Superintendent as follows:

a. Manufacturer shall have:

1) At least eight years active experience in the commercial application of CIPP.

2) A CIPP System with a minimum of 500,000 linear feet and 1,000 CIPP Reaches successfully installed.

b. CIPP Installer shall have:

1) At least three years active experience in the commercial installation of CIPP product bid.

2) At least 100,000 linear feet and 500 Reaches of successful installations.

3) A minimum of five (5) projects of comparable length, diameter (circular and other shapes) and/or complexity. Provide a list of projects with:

a) Project names.

b) Years’ work was performed.

c) Owner contact names and current phone numbers.

d) Diameter(s) and length(s) of lined pipes.

e) Construction start and completion dates.

4) A license or certificate from the Manufacturer stating the CIPP Installer is approved and/or qualified to install the Manufacturer’s CIPP system.

c. CIPP Installer Field Superintendent shall have:

1) Been the Superintendent on a minimum of 25,000 linear feet of installation.

2) At least three (3) years’ experience with CIPP. Provide a list of similar projects managed by the Superintendent. The list shall include:

a) Project names.

b) Years’ work was performed.

c) Owner contacts and current phone numbers.

3) Strong communicating skills, both written and oral, to ensure that the work proceeds in a proper and efficient manner.

d. If the Field Superintendent changes at any time during the performance of the work, submit documentation of compliance for the proposed Field Superintendent prior to the replacement Field Superintendent arriving on site.

B. Quality Control Plan:

1. A checklist for documenting critical steps in the CIPP process.

2. Defined responsibilities of the personnel assuring all quality requirements are met.

CHOH – 245002 & 287711 330125 - 4

1.8 DELIVERY, STORAGE AND HANDLING

A. Protect, store, and handle materials during transportation and delivery, while stored onsite, and during installation following manufacturer’s recommendations.

B. Maintain CIPP at proper temperature in refrigerated facilities and/or sunlight protected facilities to prevent premature curing prior to installation.

C. Immediately remove from site any CIPP showing evidence of premature curing.

D. Repair or replace any CIPP material that becomes damaged before or during insertion. Repair or replacement will be at the Contractor’s sole expense.

1.9 WORK PLAN

A. The Work Plan for each Reach shall include:

1. CIPP installation site plan and layout. Redline markups on design plans are sufficient.

2. Critical steps in the CIPP process.

3. Access and termination points. Redline markups on design plans are sufficient.

4. Field verified pipe diameter and Reach lengths. Redline tables on design plans is acceptable.

5. Equipment to be used.

6. Method of CIPP insertion (e.g., air inversion, water inversion, pulled-in-place, etc.), cure method (e.g., water, hot air/steam, UV, etc.).

B. Submit Work Plan for each pipe Reach a minimum of 14 days in advance of wet out.

1. Multiple Work Plans for different Reaches may be submitted.

2. Do not begin work on any Reach until the Work Plan has been approved.

1.10 DISPOSAL PLAN

A. Contractor shall submit a Disposal Plan for review and acceptance by Contracting Officer prior to performing any work that may generate waste materials. The plan shall include a complete description of the materials that are expected to be encountered and their proposed disposal site(s).

1. The Contractor shall provide details on how the waste materials will be safely captured, collected, and stored until disposal.

2. All sludge, dirt, sand, rocks, grease, roots, and other solid or semisolid material resulting from the cleaning operations shall be removed from the site and disposed in accordance to approved Disposal Plan.

3. The Disposal Plan may not be changed without written approval from the Contracting

Officer.

1.11 STYRENE MANAGEMENT PLAN

A. Prepare and submit Styrene Management Plan which shall include the following:

1. Styrene SDS.

2. Manufacturer’s recommendations to mitigate odors from area around job site and

Contractor’s plan to comply with those recommendations.

3. Plan to prevent water with styrene from entering storm drains, outfalls, open waterways, and other similar waterways.

4. Description of PPE for workers on job site.

CHOH – 245002 & 287711 330125 - 5

5. Sample of signs to be posted around job site to inform public of health issues and mitigation strategies associated with styrene.

6. Location of signs described in preceding bullet (redline markup on Contractor Drawings are sufficient).

1.12 SCHEDULING

A. Submit proposed work schedules a minimum of seven (7) days prior to all planned work.

B. Provide 48 hours advance verbal notice prior to pre- and post-installation CCTV inspection.

C. Identify in the work schedules and verbal notices any shifts that may take longer than eight (8) hours or require work to be performed outside the approved working hours.

PART 2 - PRODUCTS

2.1 GENERAL

A. All components of the CIPP shall be new and free of defects and shall be:

1. Continuous and of sufficient length to extend between consecutive Reaches.

2. Homogeneous across the entire wall thickness containing no intermediate or encapsulated elastomeric layer.

3. Void of material in the tube that may cause delamination in the cured product.

4. Fully wetted with no dry or unsaturated layers evident.

5. Capable of conforming to offset joints, bells, and disfigured pipe sections.

6. Able to stretch to fit irregular pipe sections and negotiate bends.

7. Have an interior pipe surface wall color after installation that is a light reflective color.

2.2 FABRIC TUBE

A. The tube shall consist of one or more layers of a flexible needled felt or an equivalent nonwoven or woven material, or a combination of nonwoven and woven materials, capable of carrying resin and withstanding the installation pressures and curing temperatures, and in accordance with ASTM

F1216, F1743, D5813, and F2019, as applicable.

B. The tube shall be:

1. Compatible with the resin system to be used on this project.

2. Fabricated to a size that, when installed, will tightly fit the internal circumference and the length of the original conduit. Make allowances for the longitudinal and circumferential stretching that occurs during placement of the tube.

3. Uniform in thickness and when subjected to the installation pressures will meet the designed finish wall thickness within negative five percent (-5%) to plus ten percent (+10%).

4. Marked for distance at regular intervals along its entire length, not to exceed five (5) feet.

Such markings shall also include the manufacturer’s name or identifying symbol.

C. Inversion Fabric Tube: the outside layer of fabric tube shall be plastic coated with a material that is compatible with the resin system and curing technique. This layer shall have an allowance for circumferential stretching during inversion.

CHOH – 245002 & 287711 330125 - 6

D. Pulled-In-Place Fabric Tube: The outside layer of fabric tube shall have an impermeable plastic coating to contain the resin during and after fabric tube impregnation. The tube shall have an allowance for circumferential and longitudinal stretching during installation.

E. Any plastic film applied to the tube on what will become the interior wall of the finished CIPP shall be compatible with the resin system used, translucent enough that the resin is clearly visible, and shall be firmly bonded to the felt material.

2.3 RESIN SYSTEM

A. The resin system shall be a corrosion resistant polyester, vinyl ester, or epoxy and catalyst system that when properly cured meets the minimum requirements given herein.

B. Thixotropic agents that do not interfere with visual inspection may be added for viscosity control.

C. Resins may contain pigments, dyes, or colors that do not interfere with visual inspection of the resin-impregnated CIPP or its required properties.

D. Resin Enhancer: Resin enhancer may be used. Maximum amount of enhancer allowed is 35 pounds enhancer per 100 pounds resin.

E. Bond Enhancer: If using resin enhancer (e.g., aluminum trihydride) or fiberglass reinforced felt, use a suitable bond-enhancing compound to increase the bond between the resin and other material.

F. The chemical corrosion resistance of the actual resin system proposed and used by the Contractor shall be tested by the resin manufacturer, in accordance with ASTM F1216, ASTM D543, ASTM

D5813, or ASTM C581 as applicable.

G. For UV-light cured systems a photo initiator shall be added to the resin prior to impregnation.

1. The photo-initiator shall be appropriate to the UV-curing system intended for use.

2. Ultraviolet curing is not allowed for CIPP lining that is more than eight (8) mm design thickness.

2.4 HYDROPHILIC END SEALS

A. Sealing material shall be as recommended by the CIPP manufacturer and is compatible with the

CIPP resin system.

B. Acceptable material shall not crack, dry up, or shrink.

C. Hydraulic cements and quick-set cement products are not acceptable.

2.5 PRELINERS

A. Preliners used to obtain proper cure of CIPP shall be:

1. Reinforced plastic sheet formed into a tube sized to fit the host pipe being lined, and

2. Continuous with the proposed CIPP in length of the Reach.

CHOH – 245002 & 287711 330125 - 7

2.6 CIPP DESIGN CRITERIA

A. Perform design in accordance with ASTM F1216, Appendix X1 or ASTM D3567 and submit to the

Contracting Officer.

B. Prior to design and ordering the CIPP, verify the internal dimensions of the existing sewer main to insure the CIPP will be the appropriate dimension.

C. Identify all physical properties and parameters of the CIPP in the design submittal.

D. The design parameters for CIPP thickness calculation shall be the following unless noted otherwise on Contract Drawings:

1. A minimum service life of 50 years under continuous service.

2. All pipes shall be considered fully deteriorated.

3. A minimum overall safety factor of 2.0.

4. A fully saturated surrounding soil, with groundwater levels at ground surface, unless shown otherwise on the Contractor Drawings.

5. AASHTO HS-20 Live Load.

6. A soil modulus of elasticity of 700-psi, unless shown otherwise on the Contract Drawings.

7. Dry soil Density of 120-lbs/ft3.

8. The depth of cover for a specific Reach shall be the deepest of the following: adjacent upstream manhole, adjacent downstream manhole, or deepest point between manholes; all as shown on the Contract Drawings.

9. A minimum ovality of 2.0% and maximum long-term deflection of 5%.

10. Enhancement Factor (K) of 7.0.

11. A Poisson’s ration of 0.3.

12. A minimum short-term flexural modulus of elasticity (ASTM D790) at 73°F.

13. Polyester System: 250,000-psi

14. Enhanced Polyester System: 400,000-psi

15. Vinyl Ester System: 300,000-psi

16. The materials used shall provide a minimum long-term (50-yr) flexural modulus of elasticity of 125,000-psi (ASTM D790)

17. A minimum flexural strength for gravity lines of 4,500-psi (ASTM D790).

18. Assume no bonding to original pipe wall.

PART 3 - EXECUTION

3.1 GENERAL

A. Field verify lengths and inside diameters of pipe to be lined prior to designing and ordering CIPP.

B. Coordinate with Contracting Officer prior to performing the lining installation.

3.2 PRE-INSTALLATION

A. Clean all debris, grease, roots, and other foreign matter from inside of sewers to be rehabilitated.

1. The sewer shall have no debris prior to CIPP installation.

2. Clear the sewer of obstructions, solids, protruding service lines, collapsed pipe, or any other obstruction that might prevent proper insertion of the CIPP assembly.

CHOH – 245002 & 287711 330125 - 8

3. Cut all protruding services with a remote robotic cutter to allow proper installation of the

CIPP.

4. Notify Contracting Officer of any obstruction or protruding service that cannot be removed and will prevent successful installation of the CIPP.

5. After consulting the Contractor Officer, obtain written approval from the Contracting Officer to perform a point repair excavation to uncover and remove or repair the obstruction prior to the commencing point repair work.

B. Manhole Access and Modifications:

1. Remove manhole frame and cover, chimney and/or cone as needed to achieve minimum access opening as required for the liner inversion process.

C. Bypassing Drainage:

1. Storm sewer lining scope at Lock 5 shall be performed prior to all Lock 5 Structural

Rehabilitation scope and before the installation of all Lock 5 Erosion and Sediment Control

Phase 1 measures.

2. Ensure no water can enter the storm sewer to be rehabilitated during all phases of the liner installation. Water shall not be allowed to enter the storm sewer to be rehabilitated until the

Contracting Officer notifies the Contractor that lining installation has been accepted and the

Contractor is permitted to allow water to enter the storm sewer.

3. Only after the lining installation has been accepted can the Contractor proceed to installing the Lock 5 Erosion and Sediment Control Phase 1 measures.

D. Temporary Control of Infiltration:

1. Chemical grout may be used to temporarily control infiltration.

E. Before starting lining operations:

1. Thoroughly inspect each Reach of sewer being rehabilitated using CCTV immediately before lining the pipe in accordance with NASSCO Pipe Condition Assessment Using CCTV

Guideline Specification.

2. Determine the exact location of all sewer service connections by CCTV inspections.

3. Pre-lining CCTV inspection is considered incidental to the CIPP lining work unless shown otherwise on the Contract Drawings.

F. Preliner:

1. Use preliner when infiltration is sufficient to cause resin migration.

2. Damage to the preliner tube shall be repaired in accordance with the manufacturer’s recommendations.

3.3 INSTALLATION

A. Install CIPP in accordance with the practices given in ASTM F1216 for direct inversion installations, ASTM F1743 for pulled-in-place installations, and ASTM F2019 for UV cured fiberglass installations.

B. Hydrophilic End Seals:

1. Prior to the installation of the CIPP, insert continuous or properly trimmed hydrophilic end seals to the interior circumference of the existing sewer at the inlet and outlet of each manhole.

2. Ensure trimmed end seal edges are butted up against each wall per the Manufacturer’s recommendation.

3. End seals shall have no gap between the trimmed edges.

CHOH – 245002 & 287711 330125 - 9

C. Tube Impregnation:

1. The quantity of resin used for tube’s impregnation shall be sufficient to fill the volume of air voids in the tube with additional allowances being made for polymerization shrinkage and the anticipated loss of any resin through cracks and irregularities in the original pipe wall.

2. Impregnate the tube using a vacuum or pressure impregnation process in conjunction with a roller system to achieve a uniform distribution of the resin throughout the tube.

D. Curing:

1. Follow the Manufacturer’s recommendations to cure the resin including, but not limited to:

a. The curing temperatures.

b. The duration of holding the pressurized fluid at curing temperatures.

2. Temperature Monitoring for CIPP in pipes less than 36-inches in diameter using steam or water cure:

a. Place temperature gauges at the upstream and downstream ends of the Reach being lined to monitor the pressurized fluid’s (air or water) temperature.

b. Document the following curing readings in curing logs every 30 minutes:

1) Temperature at the upstream and downstream manhole as indicated by external thermocouples.

2) Pressure inside the CIPP liner.

3. Curing Monitoring System for CIPP using UV Cure shall include the following:

a. A built-in process that monitors the curing as the light train travels through the CIPP.

b. An automated computer control system that adjusts light temperature, intensity, wavelength and speed of light train.

4. Submit curing logs the same day as the installation of the CIPP.

E. CIPP Joint at Manholes:

1. Seal ends of CIPP at manhole to achieve watertight pipe seals.

2. For CIPP passing through manholes,

a. Build up the invert to remove any flow restrictions and to form a continuous invert through the manhole.

b. Cut and remove CIPP material above the top of the existing channel.

c. Grout and shape the bench of the manhole as necessary to support the CIPP.

3.4 ENVIRONMENTAL CONTROLS

A. Styrene and Temperature Control:

1. Take precautions to minimize the release of styrene and mitigate styrene odors generated during the setup and CIPP lining process, and prevent such odors from entering structures, businesses, or other types of establishments.

2. At no time will water, condensate, or any other material be allowed to discharge into downstream outfalls or water bodies. Any water, condensate, or other materials shall be contained, transported offsite, and disposed in accordance with all EPA and MDE standards.

3. For CIPP installations in separate storm sewers, upon completion of cool down process, flush fully-cured and cooled-down CIPP. Flushing shall consist of jetting entire surface of CIPP twice with clean water. All flushed water shall be collected, transported offsite, and disposed in accordance with all EPA and MDE standards. At no point will flushed water, contaminated water, or any water containing compounds categorized as contaminates according to EPA and/or MDE be allowed to discharge into the Canal, within the project site, on offsite properties or any location other than that allowed by EPA and MDE.

4. Styrene air emissions shall comply with Federal and MDE requirements.

CHOH – 245002 & 287711 330125 - 10

3.5 POST-INSTALLATION VIDEO INSPECTION

A. After lining work is complete and service connections are reinstated and reactivated, perform a post-installation inspection of the CIPP in accordance with NASSCO Pipe Condition Assessment Using

CCTV Guideline Specification.

B. Post lining CCTV inspection is considered incidental to the CIPP lining work unless shown otherwise on the Contract Drawings.

3.6 SITE RESTORATION

A. Restore the project area affected by the Work to a condition at least equal to that of existing prior to the work.

B. Site restoration is considered incidental to the CIPP lining work unless shown otherwise on the

Contract Drawings.

3.7 FIELD QUALITY CONTROL AND TESTING

A. Government will verify the physical properties of the installed CIPP using an independent third-party laboratory, at Contractor’s expense, selected by Government.

B. Prepare and provide field samples to Governme for testing as follows:

1. Provide the number of samples for the linear feet (LF) of CIPP installed as follows:

a. Less than 1,500-LF – one (1) set of three (3) samples from a single location.

b. 1,500 to 3,000 – one (1) set of three (3) samples from 2 different locations.

c. Greater than 3,000-LF – one (1) set of three (3) samples from each 3,000-LF or portion thereof.

d. The number of samples sets taken are independent of the number of different Reaches lined.

e. Locations will be determined by NPS.

2. The samples shall be restrained samples for diameters of CIPP less than 18-inches; and flat plate samples for diameters of CIPP 18-inches and larger.

3. Flat plate samples shall be taken directly from the wet-out tube, clamped between flat plates, an cured in the downtube.

4. Samples for UV cured CIPP shall be restrained bag samples.

5. Label all samples with the date of installation, manhole number, and street address where the sample was taken.

C. All test will be in accordance with applicable ASTM test methods to confirm compliance with the requirements specified in this Section as follows:

1. Thickness.

2. Short term flexural (bending) strength.

3. Short-term flexural modulus of elasticity.

4. Tests will be completed for only one (1) of the three (3) samples collected for a given Reach.

5. The other two (2) samples will be stored by Government for additional testing if any samples fail to meet requirements of this Specification or the applicable ASTM.

D. The Contractor may, at its discretion and cost, conduct additional testing using additional samples.

CHOH – 245002 & 287711 330125 - 11

3.8 ACCEPTANCE

A. Acceptance of the CIPP shall be based on compliance with this Section as demonstrated by curing logs, post-installation inspection CCTV, and laboratory test results.

1. The layers of the finished CIPP shall be uniformly bonded such that:

a. It shall not be possible to separate any two layers with a probe or point of a knife blade so that the layers separate cleanly, or

b. That the knife blade moves freely between the layers.

c. All layers, after cure, from one homogeneous structural pipe wall with no part of tube left unsaturated by resin.

2. The CIPP fits tightly to the internal circumference of the existing pipe, and a membrane integrally bonded to the internal circumference of the felt, thus forming a smooth, chemically inert internal flow surface.

3. Inspection results showing defects that exceed accepted tolerance levels as defined in the table below shall be remedied by the Contractor.

4. The repair method chosen by the Contractor may be the Acceptable Remedy listed in the

Table below.

5. The Contractor may also submit an alternative remedy for approval by Government and, if

Government approves the alternative remedy, the Contractor shall install the approved remedy.

Defects Accepted Tolerance Levels Acceptable Remedy

Visible leaking through CIPP wall / Pinholes

None Install internal CIPP spot repair.

Wrinkles / Fins / Folds below the springline

Five (5%) of host Pipe

Diameter or less

Remove where recommended by the Manufacturer

Bubbles / Blistering /

Dimples / Lumps / Hot Dogs

(Longitudinal Lump) /

Foreign Inclusions / Dry

Spots

Five (5%) of host Pipe

Diameter or less assuming such does not impede flow

Remove defective portion of

CIPP and install internal CIPP sot repair following recommendations from the

Manufacturer.

Cracks None Install internal CIPP spot repair

Delamination None Remove defective portion of

CIPP and install internal CIPP spot repair

Bursts / Collapse / Unravel /

Lifts

None Remove defective portion of

CIPP and install internal CIPP spot repair

Seals at Termination Point not Water Tight

None Repair and/or replace

END OF SECTION 33 01 25