METHOD OF PROCEDURE (MOP)

Fibre Optic ProjectMETHOD OF PROCEDURE (MOP)

Trenching, Installation of Ducts and Manholes, Backfilling, Road Crossings, Reinstatement

Work Location:

Section NumberSection Name .

Element from .... to..

Date: MOP Ref: TIDMBR

Project Owner: MTNNContractor: Sub Contractor:Sub-Sub Contractor:

Installation Start DateScheduled Completion DateTarget Completion DateActual Completion Date

ContactTitleNameTelephone

ContractorSupervision Team Leader

Contractor

Site Supervisor

Quality ConsultantImplementation Team Leader

Quality ConsultantSite Inspector

MTNNImplementation Team Leader

MTNNSite Inspector

Federal Roads Local Representative

State RoadsLocal Representative

Local GovernmentRepresentative

Police

Fire

Ambulance

PHCN

Water Board

State Ministry of EnvironmentRepresentative

NIWARepresentative

Any other(.specify)

Work Location:Section NumberSection Name .

Element from....to..

Step #Listed below are the installation activities, equipment required, and steps in numerical order that must be followed to complete the job to MTNNs Specifications and General Requirements as presented in the document: MTN Scope of Work and Detailed SpecificationsCertification: Work completed in accordance with this MOP and relevant MTNN Specifications

Contractor Representative (Checklist)Quality Consultant Representative (Checklist)

11. Pre-Implementation Survey and Notifications

1.1 Prior to commencement of work at any location, the Sub Contractor shall conduct a survey to plan the implementation and identify and resolve issues that may affect the implementation.NOTE: Mandatory Check:

1.2 The Sub Contractor shall notify all relevant authorities that work is about to commence at this location, including the local office of the Ministry of Works, conduct joint surveys with stakeholders, obtain necessary approvals, identify issues or areas of concern, and coordinate any special requirements.NOTE: Mandatory Check:

1.3 The Sub Contractor shall determine the alignment of the proposed trench taking into consideration the offset from the road, the detailed design, the local topography, and any other requirement that has been identified to ensure the security of the installed network.

22 Health, Safety and Environment

All Contractors and Sub Contractors entering the worksite are required to comply with MTNNs General SHE Specifications, and Huaweis Sub Contractor Health, Safety and Environmental Policies and Procedures. In general, the following precautions shall apply:

2.1 Before commencing any activities, and for the entire duration of the work activities, ensure that the work site does not present a hazard to the health or safety of workers, traffic, pedestrians, or the general publicNOTE: Mandatory Check

2.2 Before commencing any activities for the road crossing site, the sub contractor shall ensure that adequate traffic safety control measures are in place, and any approvals and coordination required from relevant authorities is obtained

2.3 Ensure that the project activities do not negatively impact the environment

33. Marking the Trench Line

3.1 The Sub Contractor shall clear any vegetation that may obstruct the setting of the string line and marking of the chalk line.

3.2 The Sub Contractor shall set out the line of the trench using a string line, and shall then mark the line of the trench with a chalk line, or marking with paint on the sealed surface, or else mark the line of the trench by a suitable method, for the guidance of the implementation team.

3.3 Any proposal to deviate from the approved ROW alignment shall require prior approval from MTNN before commencement of any excavation.NOTE: Mandatory Check

44. Trenching

4.1 Before starting any excavation, the Site Supervisor shall ensure that the line of the trench is clearly markedNOTE: Mandatory Check

4.2 Where the surface of the trench is paved, cut and remove the paving to at least the required width of the trench.

4.3 Where the surface of the trench is not paved, remove any vegetation and excavate and remove topsoil to a depth of approximately 200 mm and set the topsoil aside.

4.4 Trenching may be done by digging with hand tools or by machine digging. The method of excavation shall be appropriate to the location and soil conditions. The method of trenching shall be recorded here:

Actual Method of Excavation: Hand / Machine

4.5 Trench width shall depend on the method of excavation, but where excavation is by hand digging, the minimum trench width shall permit safe working in the trench.

4.6 The sides of the trench shall be vertical.

4.7 Continue to excavate the trench to a total depth of 1.2metres for PVC ducts and 1.02metres for HDPE ducts, placing the excavated material separate from any topsoil. The actual trench depth shall be recorded here:

Actual Trench Depth:

Note: The depth of the trench is determined by the minimum depth of cover to the uppermost duct, which shall be 90 cm as per the MTNN Specification.NOTE: Mandatory Check

4.8 The bed of the trench shall be level and smooth

55. Installing the Manholes

5.1 Excavate a pit for the manhole allowing for the size of the manhole plus bedding and backfill material. Typically the size of the excavation shall be at least 1.3metres deep by 1.7metres long by 1.0metres wide for buried manholes and 1.3metres deep by 1.7metres long by 1.1metres wide for urban areas.NOTE: Mandatory Check

5.2 All manholes not located under streets or footways will be buried. The depth of cover to these manholes shall be 200 mm to 400 mm from the top of the roof slab to ground level.

5.3 Ensure that the bed of the pit is level and smooth

5.4 Place and compact at least 50 mm of a soft soil free of stones or any other hard materials in the bed of the pit, and ensure that the placement of the trench shall be such that the finished manhole will be at a level consistent with the ducts which should enter the manhole 50mm clear of the manhole floor. Consideration shall also be given to prevent runoff groundwater from entering the manhole.

5.5 Before placing the manhole in the pit, the Supervisor must verify that the manhole has passed the workshop quality inspection which will be indicated by a marker stenciled on the surface of the manhole, and that the manhole has been cured for at least 10 days before being transported to site. NOTE: Mandatory Check

5.6 Spray the internal and external surfaces of each manhole with water. Place the manhole level and vertical in the pit. After placing the manhole, backfill and compact a suitable material in the spaces around the sides of the manhole using hand tools to ensure that the risk of movement of the manhole or future subsidence of the surrounding soil is minimized.

5.7 For buried manholes, permanently fix the electronic marker to the upper face of the concrete cover, as per the specification drawing. Spray the concrete covers with water and put them in place over the manhole, and cover the manhole with a plastic film and leave to cure for an additional 7 days.

5.8 For the street manholes, install the cover and frame, cover the manhole with plastic film, and leave to cure for an additional 7 days.

5.9 In each case, the GPS coordinates of the final location of each manhole shall be recorded on the Red Line Drawing.

66. Preparing the Trench for Duct Laying

6.1 Before laying ducts in the trench, ensure that the bed of the trench is level and smooth and the trench is free of water.

77. Installation of Ducts

7.1 Installation of HDPE Ducts for R1 & PVC Ducts for S17.1.1 Place a soft, non-cohesive soil free of stones or any other hard materials to a minimum depth of 50mm in the bed of the trench to provide a level bed to support the ducts.NOTE: Mandatory Check

7.1.2 For the configuration of R1&S1 the depth of the trench is as per the specification. The HDPE ducts shall be placed in the trench and bound together with plastic rings every 6.0metres. The PVC ducts shall be supported and separated by spacers every 3.0metres.

7.1.3 The ducts shall be straight and free of any kinks or sharp bends

7.1.4 The ducts shall be placed on the soft soil bedding, and the trench shall be backfilled with a soft soil free of stones or any other hard materials to a depth of 50mm to 100mm above the top of the uppermost duct/s. The soft soil shall be placed above and around the ducts to ensure that the ducts are fully covered and protected, and that no voids remain around the ducts.NOTE: Mandatory Check

7.1.5 As circumstances may require, and with prior approval from MTNN, the HDPE ducts are to be installed in inside galvanized steel pipe to provide additional protection to the HDPE ducts, i.e. along busy roads and unsealed roads

7.1.6 The steel pipes need to be connected using an approved steel coupler or connector and fixed securely. The HDPE ducts shall be installed inside the steel pipe.

7.1.7 The excavated material shall be replaced in the reverse order of excavation, that is, the last material to be excavated from the bed of the trench shall be the first material to be returned to the trench. The final layer of material to be replaced at the top of the trench shall be the topsoil set aside for this purpose.

7.1.8 The backfill material shall be placed in the trench in layers of approximately 300 mm. The first layer of backfill shall be free of stones and shall be compacted by an approved method using hand tools or mechanical compactors before placing the next layer of soil. Each subsequent layer shall be compacted by an approved method using mechanical compactors before placing the next layer of soil. For compaction of layers up to but not including the final layer, an approved method using mechanical compaction shall be applied, and for the final layer of backfill, the backfill material shall be placed up to ground level, with a surcharge rising above ground level, before being mechanically compacted. Where mechanical compaction is used, the mechanical compactors shall make 2 passes of the entire length of trench section being backfilled and compacted. The surcharge should not interfere with the desired drainage path of runoff water.NOTE: Mandatory Check

7.1.9 During backfilling, the warning tape shall be laid along the whole length of the trench approximately 40 cm below the ground level.NOTE: Mandatory Check

7.1.10 Verification of compaction shall be performed using the Dynamic Cone Penetrometer and a relevant standard test method. Where Penetrometer testing is used, the measure of the compaction shall be that the compacted material shall return results similar to the adjacent undisturbed soil. The test shall be performed at the request of the Project Owner, MTNN.

7.1.11 Failure of the compacted backfill to satisfy the test criteria shall result in rework by the Sub Contractor

7.1.12 A blocking concrete, 15MPa, shall be installed to encase the ducts entering the manhole for at least 1.0metre away from the chamber wall at both duct entries. The concrete shall provide 75mm to 100mm of cover around the ducts, including the top and bottom.NOTE: Mandatory Check

7.1.13 The ducts shall be laid the full length of the trench between the manholes, and HDPE ducts shall continue into the manhole for a length of at least half the length of the manhole in order to make easier the installation of the cable. PVC ducts shall be finished flush with the wall of the chamber. The ends of all vacant ducts entering the manholes shall be sealed with end caps or duct plugs.

7.1.14 The HDPE ducts between manholes should be continuous and without any joins. However, should it be necessary for any reason to join the ducts between manholes, then they shall be joined by the approved method, and the number of joins shall be kept to a minimum.

7.2 Installation of HDPE ducts for R2 & PVC ducts for S2

7.2.1 For the configuration of R2&S2 the depth of the trench is as per the specification. The HDPE ducts shall be placed in the trench and bound together with plastic rings every 6.0metres. . The PVC ducts shall be supported and separated by spacers every 3.0metres.

7.2.2 For the R2 configuration, if the depth of cover is less than 90cm, then a concrete layer shall be included in the backfill to protect the HDPE Ducts. The thickness of concrete layer shall be (90-C)/2 cm, where C is the cover from the top of the uppermost duct to ground level, as per the specifications.

For the S2 configuration, if the depth of cover is between 50cm to 90cm, then a concrete layer shall be included in the backfill to protect the PVC Ducts. The thickness of concrete layer shall be (90-C)/2 cm, where C is the cover from the top of the uppermost duct to ground level, as per the specifications.NOTE: Mandatory Check

7.2.3 Where a concrete layer is used to protect the ducts, the minimum strength of the concrete shall be 15MPa.

7.2.4 The concrete may be mixed by hand or by machine. Hand mixing shall be acceptable for trench lengths up to 20metres. Machine mixing shall be used for trench lengths greater than 20metres.NOTE: Mandatory Check

7.2.5 The excavated material shall be replaced in the reverse order of excavation, that is, the last material to be excavated from the bed of the trench shall be the first material to be returned to the trench. The final layer of material to be replaced at the top of the trench shall be the topsoil set aside for this purpose.

7.2.6 The backfill material shall be placed in the trench in layers of approximately 300 mm. The first layer of backfill shall be free of stones and shall be compacted by an approved method using hand tools or mechanical compactors before placing the next layer of soil. Each subsequent layer shall be compacted by an approved method using mechanical compactors before placing the next layer of soil. For compaction of layers up to but not including the final layer, an approved method using mechanical compaction shall be applied, and for the final layer of backfill, the backfill material shall be placed up to ground level, with a surcharge rising above ground level, before being mechanically compacted. Where mechanical compaction is used, the mechanical compactors shall make 2 passes of the entire length of trench section being backfilled and compacted. The surcharge should not interfere with the desired drainage path of runoff water.

7.2.7 During backfilling, the warning tape shall be laid along the whole length of the trench approximately 40 cm below the ground level.

7.2.8 Verification of compaction shall be performed using the Dynamic Cone Penetrometer and a relevant standard test method. Where Penetrometer testing is used, the measure of the compaction shall be that the compacted material shall return results similar to the adjacent undisturbed soil. The test shall be performed at the request of the Project Owner.

7.2.9 Failure of the compacted backfill to satisfy the test criteria shall result in rework by the Sub Contractor

7.3 Installation of HDPE Ducts for R3 & PVC Ducts for S37.3.1 When circumstances demand, and with prior MTNN approval, R3 configuration may be used to provide additional physical protection to the HDPE ducts. A minimum blinding layer of 5cm of concrete shall be placed in the trench to support the HDPE ducts. The ducts shall be fully concrete encased with a minimum of 10cm of concrete above the top of the uppermost duct.

7.3.2 For the S3 configuration, to be used when the depth of the trench is from 30cm to 50cm, the trench will be completely backfilled with concrete as per MTNN specification. Spacers shall be used to provide support and separation of the PVC ducts, and to allow the concrete to fully encase the ducts.

7.3.3 Where concrete is used either to encase the ducts, or as a protective layer to prevent the ducts, or as complete backfill, then the minimum strength of the concrete shall be 15MPa.

7.3.4 For the R3 configuration, the excavated material shall be replaced in the reverse order of excavation, that is, the last material to be excavated from the bed of the trench shall be the first material to be returned to the trench. The final layer of material to be replaced at the top of the trench shall be the topsoil set aside for this purpose.

7.3.5 For the R3 configuration, the backfill material shall be placed in the trench in layers of approximately 300 mm. The first layer of backfill shall be free of stones and shall be compacted by an approved method using hand tools or mechanical compactors before placing the next layer of soil. Each subsequent layer shall be compacted by an approved method using mechanical compactors before placing the next layer of soil. For compaction of layers up to but not including the final layer, an approved method using mechanical compaction shall be applied, and for the final layer of backfill, the backfill material shall be placed up to ground level, with a surcharge rising above ground level, before being mechanically compacted. Where mechanical compaction is used, the mechanical compactors shall make 2 passes of the entire length of trench section being backfilled and compacted. The surcharge should not interfere with the desired drainage path of runoff water.

7.3.6 For the R3 and S3 configuration during backfilling, the warning tape shall be laid along the whole length of the trench at nominally 40 cm below ground level.

7.3.7 For the R3 configuration, verification of compaction shall be performed at the request of the Project Owner, and shall be performed using standard test methods such as Dynamic Cone Penetrometer testing. Where Penetrometer testing is used, the measure of the compaction shall be that the compacted material shall return results similar to the adjacent undisturbed soil.

7.3.8 Failure of the compacted backfill to satisfy the test criteria shall result in rework by the Sub Contractor

88. Backfilling the Trench for Road Crossings

Specifications for backfilling shall follow the specifications of the Road Authority

99. Installation of Marker Posts and Marker Plates and Warning Plates

Marker posts and marker plates and warning plates shall be manufactured and installed as per the approved specifications.

1010. Reinstatement

10.1 As required, reinstatement shall be completed as per the requirements of, and to the satisfaction of the governing body, that is, Federal Government, State Government, or Local Government AuthorityNOTE: Mandatory Check

10.2 The reinstatement finish provided shall be as indicated here:

Concrete Asphalt Gravel Other (Specify)

Note: Where the segment of work includes different types of reinstatement, the route length of each type of reinstatement is to be indicated.

1111. Final Inspection

A final inspection of each site shall be carried out to verify that:

11.1 All work is complete and the work location has been left in a safe and tidy condition

11.2 All construction materials and debris have been removed or disposed of in an acceptable manner

11.3 All repairs and reinstatements have been completed and are acceptable to the governing authority

Work Location:

Section NumberSection Name .

Element from....to..

From Manhole..to Manhole.This Section of Work is approved for installation of Optic Fibre Cable. The Outstanding Issues for this section are recorded as follows:

Outstanding Issues List:

1. Major (Service Affecting):ITEM & DESCRIPTION:Remedial Action Required:Required-By Date

2. Minor (Non-Service Affecting):ITEM & DESCRIPTION:Remedial Action Required:Required-By Date

NOTE: Service Affecting Issues must be remedied before blowing fibre into duct and Non-Service Affecting Issues must be remedied before Final Acceptance.MTNN Representative Contractor Representative: Quality Consultant Rep:FOB PROJECT QUALITY INSPECTION CHECKLIST

NO.ItemDescriptionInspection MethodCommentRemark

1Pre-Implementation,

Survey and NotificationsSurvey Completed

All relevant authorities contacted, notified and consulted

2Health, Safety and EnvironmentWorksite is properly signposted and protected

Workers are provided with safety protection

Signs and barricades to protect passers-by

Safe working practices for the activity

3MarkingTrench alignment clearly marked

4Trenching

Correct Alignment

Pavement cut before removal

Topsoil removed and set aside

Acceptable method of trenching

Acceptable width of trench

Correct depth of trench

Bed of trench finished level and smooth

5Manhole

InstallationCorrect manhole type for the location

Verify Quality Inspection Acceptance of Manhole

Correct depth and level of manhole

Manhole bedded and backfilled with compaction

Manhole fittings installed correctly

6Preparing the Trench for Duct LayingEnsure trench bed is level and smooth

Ensure no water in the trench

7Laying the Ducts, Backfilling, CompactionCorrect number and type of duct

Correct Installation Method, R1, R2, R3, S1, S2, S3 etc

Ducts straight and free of kinks and bends

Ducts protected by soft soil

Blocking concrete encasing ducts at manhole entry

Duct entry to manhole: Verify Clearance from Floor and Extension of Ducts into Manhole

8Backfilling the Trench for Road CrossingCorrect process of backfilling trench

Correct method of compaction of backfill

Warning tape installed at correct depth

Penetrometer testing as per requirements

Segment: Inspection Location: Inspection Date:

:

FOB PROJECT QUALITY INSPECTION TABLE

Segment: Inspection Location: Inspection Date:

9Marker Posts

InstallationManhole labels installed correctly

Electronic Marker installed on manhole cover

Route markers installed every 250m

10ReinstatementReinstatement completed satisfactorily

11Final InspectionAll work is complete and the work location has been left in a safe and tidy condition

All construction materials and debris have been removed or disposed of in an acceptable manner

All repairs and reinstatements have been completed and are acceptable to the governing authority

Client Representative Contractor Representative: Quality Consultant Representative:

(FOB) TURNKEY PROJECT

Federal Ministry of Works Supervision Log

Pre-implementation Survey, Notification & Re-instatement of Construction Works

Work Location:

Section Number..

Survey Date

Section Name . Element from... ToFrom Manhole..To Manholeobservations / special requirements:

The above-described section of work is approved for trenching / re-instatement to original ground conditions (delete as appropriate)

FMW Representative

(Name, Date & Signature)Contractor Representative

(Name, Date & Signature)Quality Consultant Representative

(Name, Date & Signature)MTNN Representative

(Name, Date & Signature)

Installation of manholes is independent of the Trenching / Duct Installation / Backfilling process and will not be part of the sequence of steps in that process. Normally the manholes will be installed first, and the ducts will then be installed between the manholes. Alternatively, the ducts may be installed first, and then the manholes installed later.

Soft soil shall mean a soil that is free of stones or hard materials or organic or any other deleterious matter.

File: MOP_Trenching Laying Ducts Backfilling Reinstatement_Issue 5_17 Oct 2007 (5) Page 4 of 16 Pages

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