General Procedure - E

C116-06-05RELConstruction / Release / Implementation Juan CarlosF.Girodet

A223-05-05COMClient Review & Comments / ImplementationJuan CarlosD.BuccellatoF.Girodet

Ramirez

A128-02-05COMClient Review & Comments / ImplementationJuan CarlosD.BuccellatoF.Girodet

Ramirez

Rev.DateStatusIssued forOriginatorCheckedApproved

DD-MM-YY

Company :

The Shell Petroleum Development Company

of Nigeria Limited (SPDC)

This document contains information which is proprietary to Shell Petroleum Development Company of Nigeria Ltd (SPDC). This information is to be held in confidence. Disclosure, reproduction or other use of this document is prohibited without the prior written consent of SPDC.

Contractor :

SOKU LGSP DE-BOTTLENECKING Project

Company contract No. :

E 15253Type of document :

PROJECT PROCEDURE

Contractor's / Subcontractor's document identification : Other identification :

Codes :Rev.Saipem s.a.

F10044100QUA05.8100040C1

Document title :

backfilling AND CLEAN UP

Company document No. : SPDC 2004 0091049Page :

Company document Type : E131 / 6

change record PAGE

Rev. NStatusDescription of Revision

A1COMClient Review & Comments / Implementation

A2COMClient Review & Comments / Implementation

C1RELConstruction / Release / Implementation

INDEX

41.SCOPE AND PURPOSE

2.REFERENCE DOCUMENTS43.DEFINITIONS44.rESPONSABILITIES45. activiTIES description46.inspection and testing57.flow chart58.Safety69.quality records6

1.SCOPE AND PURPOSE

The scope of this Procedure is to establish a detailed description of operations that shall be performed during padding, backfilling and clean up activities in the construction of flow lines for LGSP De-Bottlenecking Project.

2.REFERENCE DOCUMENTS

Quality Control Plan:

F10044-100-QUA-05.81-00025

Inspection and Testing PlanF10044-100-QUA-05.81-00035

Project Specifications:

a- Construction Spec S-25Pipeline Construction

b- DEP 31.40.00.10Pipeline Engineering

Applicable standards and codes:

a- ANSI/ASME B 31.8Gas transmission and distribution pipeline system

3.DEFINITIONS

COMPANY: Shell

CONTRACTOR: Saipem

CONTRACT:The whole set of documents enclosed in the volumes making up the Contract documentation.

PROJECT: SOKU LGSP De-Bottlenecking project.

RECORD: Document that shows results achieved or providing evidence of activities performed.

SITE:The site locations where WORK is to be performed.

4.rESPONSABILITIESQuality Manager: He is responsible to prepare and issue this procedure, in co-operation with the Quality Engineer

Project Manager: He is responsible to ensure that information concerning the work is available on site.

Construction Manager: He is responsible to ensure that the quality of the work is maintained.

The Site Superintendent: He is responsible to follow the requirements of this procedure to ensure that the contents are applied, and also responsible for safe use, handling during joint coating activities.

Discipline Supervisor (Foreman): Shall be responsible for performing all necessary activities to ensure that the quality of the work has the minimum requested level of quality indicated by this procedure.

QC Supervisor: He is responsible to monitor and co-ordinate on site the execution of the job, collect all relevant Quality Records verifying its adequacy and make sure if the records are correctly filled out and archived.

The QC inspector: He shall be responsible for performing all necessary inspections, as established in this document and in the Quality control plan, ITP and shall be responsible for issuing the related quality records, obtaining all necessary approvals and preservation of the documents.

5. activiTIES descriptionThis Section of the procedure shall apply to under ground pipes (3 layers PE). Each of them has to be read and interpreted in conjunction with the related specifications prepared for the project and described also in Section 2, for backfilling and clean up activity.

5.1Prior to start of any backfilling operations, the pipeline section and its appurtenances shall be checked to verify that the specified cover is assured

The section of the pipeline must be lowered on soft bed of the trench. This soft bed shall be prepared from the soil of the excavation, and shall be free from gravel, rock or lumps of hard material. The method of preparation of the soft bed shall be by mechanical or manual means. It shall be carefully placed around the pipe in layers not exceeding 15 cms, deep and uniformly compacted. Placement and compaction of soft surround material shall be continued up to a thickness of 20 cms above the crown of the pipe across the full width of the pipe trench as per indicated in construction specifications5.2 Similarly, backfill material shall be the same as material from the bulk excavation from the trench, which shall also be free from gravel, rock or lumps of hard material

5.3Where the trench has been excavated through or along drive ways, walks, roads, and at live stock passage ways and other locations indicated on the Typical drawings, the padding shall be thoroughly compacted by Contractor with approved hand tools, or mechanical equipment to achieve a good compaction around the pipe and to avoid any settlement

5.4 While in track or roads crossings it is required to have the ground regarded to its original contour where restoration is necessary to assure the safety of the pipeline and the passage of traffic, for capping of backfilling along the pipeline conventional mounding over the pipeline without any mechanical compaction shall be acceptable.

5.5 The backfill shall be completed by the formation of crown along the pipeline, shaped with grader and without mechanical compaction.

If the backfill material (excavated material) is insufficient or cannot be rid off objectionable materials e.g. rocks, stones, herbs etc thereby rendering it unsuitable for placement around the pipe, the contractor shall locate and transport suitable soft material (which meets the requirements of the specification) in sufficient quantities to completely surround the pipe and cover it to adequate depth.

The material shall be used both as bedding and padding material in areas of hard rock, stones or where the natural ground is evident to be hard.

The thickness of the bedding shall be 150-mm minimum. This shall be guaranteed by taking spot measurement and quality of the soft material.

Soft material used as padding material shall cover the pipe to at least 200mm thick.

5.6 If any road crossing by open cut method, the backfill shall be well compacted by mechanical means and the surface shall be restored to its original uncut status.

To achieve the above objective and also to eliminate settlement problems, material (well compacted) shall be used as backfill material over cut roads

5.7 The backfill material unless otherwise specified , along the trench line the cover form the top of the pipe to consolidated mud or ground level shall not be less than 60 cms., except through irrigated fields and rocky lands where the backfilling shall be completed in accordance with construction specification S-25, clause 25.6.2 & 25.6.3.

6. inspection and testing

The work performed will be monitored, verified and recorded in accordance with the Inspection and Test Plan for Trenching mentioned at section 2.

The activities shall be recorded by Contractor discipline inspector in a daily activity report containing all the pertinent information regarding padding, backfilling and clean up.

The Field Quality Control organization shall be responsible for collection and preservation of QA/QC documentation, which shall be monitored by QC supervisor.

7. flow chart

N/A

8. Safety

All personnel concerned in the above mentioned activities shall follow the requirements of the HSE design Plan No.F10044-100-SAF-05.81-02071 and F10044-100-HSE-05.81-00033, to prevent any hazardous situation during trenching operations.

Constant care is to be taken considering that the activity is carried out in a corridor between existing live pipelines and other facilities

The foreman and supervisor shall take special care when moving and working are done under power and telephone lines

Contractor Safety Engineer will closely monitor and supervise safety precautions.

Suitable Personal Protective Equipment will be provided for all staff deployed for BACKFILLING activities. Use of PPE shall be enforced by close supervision of all activities.

Hazards associated with BACKFILLING activities and safeguarding measures must be identified

9. quality records

9.1Backfilling inspection record F10044-100-QUA-13.62-13000