Pipeline Report S1198-01 Final 110303

AMERADA HESS (INDONESIA-PANGKAH) LIMITED FINAL REPORT ON THE ROUTE SURVEY FOR THE PROPOSED GAS PIPELINE FROM UJUNG PANGKAH TO GRESIK OFFSHORE EAST JAVA INDONESIA Report No. S1198-01

Final Report on the Route Survey for the Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

FINAL REPORT ON THE ROUTE SURVEY FOR THE PROPOSED GAS PIPELINE FROM UJUNG PANGKAH TO GRESIK OFFSHORE EAST JAVA INDONESIA Report No. S1198-01

P.T. Kalvindo Raya Semesta Jl. Asem Baris Raya No.1 Jakarta Selatan 12830 Indonesia

P.T. Kalvindo Raya Semesta Report Name: Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

REPORT CERTIFICATION FOR

AMERADA HESS (INDONESIA-PANGKAH) LIMITED

FINAL REPORT ON THE ROUTE SURVEY FOR THE PROPOSED GAS PIPELINE FROM UJUNG PANGKAH TO GRESIK OFFSHORE EAST JAVA, INDONESIA Report No. S1198-01 This report has been compiled and checked as follows:

1

Written by

: Edy Sutrisno Geophysicist - PTKRS

2

Checked by

: Ronny Theophilus Operations Manager - PTKRS

3

Approved for Issue

: Ric Wymer Technical Adviser – PTKRS

Distribution: This report is distributed as follows: 1. Amerada Hess (Indonesia-Pangkah Ltd 2. PT Kalvindo Raya Semesta Revision History: Rev Date 0 24 February 2003 1 27 February 2003 2 11 March 2003

2 hard copy + 2 soft copy (CD-ROM) 1 copy

Reason for Issue Draft Report Removed a 20” from all report text Final Report

P.T. Kalvindo Raya Semesta Report Name: Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

TABLE OF CONTENTS Page

1.

EXECUTIVE SUMMARY

1

1.1

General

1

1.2

Bathymetry

1

1.3

Seabed features and sediments

2

1.4

Magnetic Anomaly

2

1.5

Sub-surface Geology

3

2.

INTRODUCTION

4

2.1

General

4

2.2

Scope of work

4

2.3

Survey Objectives

6

2.4

Service Warranty

7

3.

GEODETIC PARAMETER OF SURVEY LOCATION

9

3.1

Geodetic

9

3.2

Projection

9

3.3

Miscellaneous

9

4.

DATA PROCESSING AND INTERPRETATION

11

4.1

Navigation Data Processing

11

4.2

Tidal reduction and Bathymetry processing

11

4.3

Interpretation and Reporting

12

5.

SURVEY RESULTS

13

5.1

Bathymetry

13

5.2

Seabed Sediments and Features

18

i P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

TABLE OF CONTENTS Page 5.3

Magnenometer anomaly

33

5.4

Sub-seabed Geology

38

5.4.1 5.4.1.1 5.4.1.2 5.4.1.3

Shallow Zone Stratigraphy Section 1, KP 4.0 to 6.1 Section 2, KP 6.1 to KP 9.5 Section 3, KP 9.5 to KP 42.25 (Proposed Platform-A)

38 38 39 39

5.4.2

Shallow Geological Structure

40

5.5

Geotechnical Investigation

51

6.

CONCLUSIONS

53

ii P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

LIST OF TABLES Page Table 1

Coordinates of the Proposed Pipeline Route

5

Table 2

Tide Harmonic Constants for Surabaya, Ujung Pangkah and Karang Jamuang

11

Table 3

Buried sections of the Kodeco 14” gas pipeline

19

Table 4

Coordinates of debris

19

Table 5

Coordinates of magnetic anomalies

34

LIST OF FIGURES Figure 1

General Location Map.

Figure 3

Example of echo sounder record, southwest to northeast line AHLUP-CL-S1, showing a smooth and rounded/ slight wavy seabed around KP 6.15

15

Example of echo sounder record, southwest to northeast line AHLUP-CL-S1, showing smooth to slight wavy with minor irregular seabed

16

Example of echo sounder record, southwest to northeast line AHLUP-CL-S1, showing irregular seabed

17

Example of side scan sonar record, south to north line UP_CL_IF_S1A, showing the kellong area around KP 4.3 and 14” gas pipeline

21

Example of side scan sonar record, east to west line AHLUP_X08, showing kellong and calcarenite/ dense sand area around KP 7.5

22

Example of side scan sonar record, southeast to northwest line UP_KP10_IF_04, showing kellong area around KP 10.6

23

Example of side scan sonar record, southeast to northwest line UP_KP16_IF_07, showing kellong area around KP 16.2

24

Example of side scan sonar record, southwest to northeast line UP_WE2_C, showing kellong area and debris around KP 16.2

25

Example of side scan sonar record, southwest to northeast line AHLUP_CL_S1, showing a boundary between smooth seabed (sand) and calcarenite areas around KP 6.7

26

Example of side scan sonar record, southwest to northeast line AHLUP_CL_S1A, showing pipeline span around KP 7.7

27

Example of side scan sonar record, southwest to northeast line AHLUP_CL_S1, illustrating coralline area around KP 8.7

28

Figure 4

Figure 5 Figure 6

Figure 7

Figure 8 Figure 9 Figure 10

Figure 11

Figure 12 Figure 13

iii P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

8

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

LIST OF TABLES Page Figure 13

Figure 14 Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Example of side scan sonar record, southwest to northeast line UP_S2_WW2, illustrating rippled sand and linear debris (suspected to be abandoned pipeline) around KP 11.8

29

Example of side scan sonar record, northeast to southwest line AHLUP_CL_S3E, illustrating sand area around KP 24.5

30

Example of side scan sonar record, southwest to northeast line UP_S4_WW2, illustrating smooth seabed (soft clay) around KP 30.0

31

Example of side scan sonar record, southwest to northeast line AHLUP_CL_Y, illustrating the clear area showing (no debris and sonar contact), around KP 31.2

32

Example of magnetometer record, east to west line AHLUP_X08, showing the magnetic anomaly across 14” gas pipeline around KP 4.3

35

Example of magnetometer record, southwest to northeast line UP_S2_WW1, showing the magnetic anomaly along a suspected abandoned pipeline section at and around KP 11.5

36

Example of magnetometer record, southeast to northwest line UP_S4_WW1, showing the magnetic anomaly (probably buried object) around KP 31.2

37

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_S1A illustrating the lithological sequences around KP 5.3

41

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_S1, passing through the calcarenite/ dense sand area at and around KP 6.2

42

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_S1, passing through coral area at and around KP 7.9

43

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_S1, illustrating the lithological sequences around KP 9.5

44

Example of sub-bottom profiler (pinger) record, northeast to southwest line AHLUP_CL_S2A illustrating the lithological sequences and deep channel around KP 14.5

45

Example of sub-bottom profiler (pinger) record, southwest to northeast line UP_S3_WE1, illustrating the enhanced reflector (possibly top of disperse biogenic gas) at and around KP 17.5

46

Example of sub-bottom profiler (pinger) record, southwest to northeast line UP_S3_WE1, illustrating acoustic attenuation at and around KP 21.5

47

iv P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

LIST OF TABLES Page Figure 27

Figure 28

Figure 29

Example of sub-bottom profiler (pinger) record, northwest to southeast line AHLUP_CL_Y, illustrating a significant acoustic attenuation around KP 34.6

48

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_Y, illustrating the lithological sequences around KP 37.0

49

Example of sub-bottom profiler (pinger) record, southwest to northeast line AHLUP_CL_Y, illustrating acoustic attenuation at and around KP 40.3

50

LIST OF APPENDICES Appendix A

-

Geotechnical Report on Drop Core Samples

Appendix B

-

Predicted tidal curve

Appendix C

-

Temperature and sound velocity of sea water against depth profile during the survey execution (9 – 22 January 2003)

Appendix D

-

P.T Kalvindo Raya Semesta - Service Warranty

v P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

LIST OF DRAWINGS Drawing No.

Title

Scale

Drawing No.

Drawing 1 of 10

-

Alignment chart From KP 0.0 to KP 4.39

1:5000

S1198-01/01

Drawing 2 of 10

-

Alignment chart From KP 3.96 to KP 8.97

1:5000

S1198-01/02

Drawing 3 of 10

-

Alignment chart From KP 8.69 to KP 13.72

1:5000

S1198-01/03

Drawing 4 of 10

-

Alignment chart From KP 13.47 to KP 18.47

1:5000

S1198-01/04

Drawing 5 of 10

-

Alignment chart From KP 18.22 to KP 23.22

1:5000

S1198-01/05

Drawing 6 of 10

-

Alignment chart From KP 22.86 to KP 26.54

1:5000

S1198-01/06

Drawing 7 of 10

-

Alignment chart From KP 26.44 to KP 30.62

1:5000

S1198-01/07

Drawing 8 of 10

-

Alignment chart From KP 30.37 to KP 35.37

1:5000

S1198-01/08

Drawing 9 of 10

-

Alignment chart From (KP 34.64 – KP 39.24

1:5000

S1198-01/09

Drawing 10 of 10

-

Alignment chart From KP 38.56 to KP 41.225

1:5000

S1198-01/10

Drawing 1 of 1

-

Overview Chart From KP 0.0 to KP 41.225)

1:10000

S11981/overview

vi P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

1.

EXECUTIVE SUMMARY

1.1

General A gas pipeline with design route length of 41.25 km is proposed for installation between the planned Ujung Pangkah platform and onshore processing facility (OPF) Gresik, East Java. The route has been designed to run from the platform in a south easterly direction towards Karang Jamuang to a point near the existing 14” Kodeco gas line and will then turn south southwest and run parallel with the line at an offset of 50 m west of the line to a point near the PT Maspion jetty where the route turns south west for the final run to shore.. The majority of the route passes through shallow water depths and is in close proximity to intense shipping and fishing vessel activity using the Surabaya channel. To establish the route centre line a number of survey lines were run parallel and perpendicular to the Kodeco 14” gas line with side scan sonar, pinger and magnetometer. An offset of 50m west of the gas line was chosen as the design route centre line. Since the proposed route traversed sections of shallow water, the work program was conducted from a vessel of shallow draft during daylight hours only. The landing survey between KP 0.0 and KP 3.6 was conducted from a local fishing skiff using positioning and echosounder tools only. The survey operations was carried out from 6 January to 29 January 2003. After the first draft report has been submitted, the Client requested to move the KP 0.0 to some 200 m southeast from the original location.

1.2

Bathymetry All bathymetry data were reduced to Lowest Astronomical Tide (LAT) by using interpolation of predicted tides from three tide stations, Surabaya, Ujung Pangkah and Karang Jamuang. In general the seabed topography from KP 0 to KP 3.6 is essentially flat, lying 0 m to 0.8 m above LAT, except for a 100 – 150m wide channel zone near KP 1.4. From this mud/ sand flat area, the seabed dips steeply toward sea to a depth of around 7 m. The dipping zone lies between KP 3.66 and KP 3.81, and has a gradient of approximately 1:2. From KP 3.81 towards sea, the seabed along the route corridor is generally smooth, sloping gently with gradients less than 3°. The exception is where the route passes through coral, calcarenite and dense sand areas between KP 6.7 and KP 9.5. Water depth within the coral area varies from 7.5 m around KP 8.8 to 16.5 m around KP 8.0.

1 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

The water depth shallows to less than 6 m between KP 20.0 and KP 31.0. The maximum depth of 27.3 m is located around KP38.3, while the minimum depth of 4.1 m is located around KP. 27.0. The possibility of pipeline free spans exists around KP 7.67, KP 7.9 and KP 8.0 within the coral/ calcarenite (dense carbonate sand areas), and around KP 1.4 (flat area) and KP 10.9 within the sandy areas. 1.3

Seabed features and sediments In general the seabed sediments consist of loose sands, calcarenite/ dense sand, coral, and soft clay. Within the sand and soft clay areas, the seabed is essentially smooth, while in the calcarenite/ dense sand and coral the seabed is more irregular. The predominantly loose sand areas occur from KP 4.0 to KP 6.7, KP 9.3 to KP 11.8 and KP 24.2 to KP 27.6. The calcarenite/ dense sand and coral occurs between KP 6.7 and KP 9.3, while the remaining route consists predominantly of soft clay with scattered sand/ silt and shell fragments. The majority of the Kodeco 14” gas pipeline running parallel with the route is mostly exposed on the seabed but is partially or totally buried in several short sections. A significant free span occurs around KP 7.68 of approximately 70m length and 2.5 m height. Several kellongs (fishing platform or traps) constructed of bamboo embedded in the seabed were found around KP 4.2, KP 7.5, KP 10.5 and KP 16.2. Some of these structures are situated on the proposed route. There are several magnetic and non-magnetic debris, one of significance located between KP 11.23 and KP 12.125, offset 50 m to 75 west from the proposed route. It is linear in nature and suspected to be an abandoned pipeline section from the Kodeco gas line. Apart from the above significant features, minor features were noted such as pockmarks and anchor/ trawl scars, however these are not likely to affect route design.

1.4

Magnetic Anomaly Several magnetic anomalies were recorded along the route. The most significant of course being where the survey traversed the existing 14” Kodeco pipeline. Also identified was what is suspected to be a length of abandoned pipeline located between KP 11.23 and KP 12.125. A further significant anomaly was recorded at KP 31.25 however the side scan records failed to identify a seabed contact, so the anomaly is assumed buried.

2 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

1.5

Sub-surface Geology The superficial sediments consist of loose sand and very soft clay, the exception being the calcarenite/ dense sand and coralline areas. No seismic data was shot over the very shallow shore area from KP 0.0 to KP 4.0. In general the superficial sands occur along three sections, KP 4.0 to KP 6.1, KP 9.5 to KP 11.8 and KP 24.2 to KP 27.65. In the first section KP 4.0 – KP 6.7, the thickness of loose sand varies from 0.5 m to 2.5 m, overlying a sequence of cross bedded sand. The loose sand layer thins and is absent over the calcarenite/ coral areas. The second section from KP 9.5 to KP 11.8, has a thickness of loose sand varying from 0.5 m to 1.5 m and overlies well laminated soft to firm sandy clay/ silty clay. The thickness of loose sand in the third section KP 24.2 to KP 27.65 varies from 0.5 m to 1.2 m. It overlies a sequence of soft to firm silty clay. In addition the superficial loose sand also occurs within the buried channels situated between the coral/ calcarenite areas. Superficial soft to very soft clay occurs along most of the offshore part of the proposed route. The thickness varies between 2 m and 5 m and it overlies sequences of soft to firm clay. Limited sub-bottom profiler penetration occurs along several sections of the proposed route, which is interpreted to be caused by the presence of organic material within the clay. The superficial layer over the calcarenite/ dense sand is very thin or absent. No sub-bottom profiler penetration was achieved in these areas. Attention is drawn to the calcarenite and coral areas of the route where the proposed pipeline may experience spanning.

3 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

2.

INTRODUCTION

2.1

General PT Kalvindo Raya Semesta (PTKRS), a member of the Fugro Group of Companies was contracted by Amerada Hess (Indonesia - Pangkah) Limited (AHL) to survey a platform site survey and potential pipeline route running from it to land fall, near the PT Maspion complex in Gresik. (See Figure 1). The Ujung Pangkah Field development proposes to produce and supply natural gas to the PLT Power Station in Gresik through a number of gas development wells. A 41.22 km trunk pipeline will be used to transport the gas from the field to an onshore receiving facility located within the PT Maspion complex. The route survey operations have been divided into three sections, onshore area, inshore area from KP 0.2 to KP 4.0 and offshore area from KP 4.0 to the proposed platform at Ujung Pangkah. The shallow draft survey vessel KM Sejati Berkah was mobilised from Jakarta on 30 December 2002 and arrived Gresik on 3 January 2003. The survey team was mobilised from Jakarta to commence work on 3 January 2003. The geophysical and geotechnical survey operations within the offshore section commenced on the 6th January 2003 and was completed on the 29th January. The inshore operations using a local wooden fishing skiff commenced on the 23rd January 2003 and was completed 27th January. The objectives of the pipeline route survey were to provide information on the bathymetry, seabed features and sub-seabed strata to identify and delineate features or anomalies that may constrain design or represent hazards to the pipeline lay. This report (S1198-01) covers interpreted results and conclusions relating to the proposed pipeline route survey. A separate report, No S1198/03, covers the field operations and survey procedures.

2.2

Scope of work Before deciding on a route design the 14” Kodeco gas pipeline was identified using sub-bottom profiler (pinger), magnetometer and side scan sonar, in order to establish the route centreline to be offset from the existing pipeline. The pipeline route survey achieved a corridor coverage from multibeam data of approximately 250m. Along the offshore area (from KP 4.0 to KP 41.2), three lines were run, one centre-line and two wing lines on either side with an offset of 60m from the centreline. Cross lines were run perpendicular to the longitudinal lines at an interval of 500 m. All the lines were run using single

4 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

and multi beam echo sounders, side scan sonar, sub-bottom profiler (pinger) and magnetometer. In the inshore area from KP 0.2 to KP 4.0, 11 longitudinal lines were run, one centreline and 5 wing lines on either sides at 25 m interval using a single beam echo sounder. UTM Easting Northing (m) (m)

Geographical Latitude Longitude (S) (E)

Name

KP’s

LP

0

679322.1

9213774.6

7°6’36.06

112°37’25.37”

51°15’25.935”

TP1 IP1 TP2

3.147 4.301

681777.8 682285.8 682388.5

9215745.0 9216152.6 9216690.9

7°5’31.64” 7°5’18.31” 7°5’00.77”

112°38’45.17” 112°39’01.68” 112°39’04.96”

51°15’27.935” 10°48’25.867” 10°48’28.714”

IP2 IP3

4.462 7.963

682418.7 683050.5

9216848.8 9220292

7°4’55.63” 7°3’03.48”

112°39’05.93” 112°39’26.12”

10°23’51.570” 11°04’0.787”

TP3 IP4 TP4

9.820 10.073

683406.9 683431.4 683476.5

9222114.6 9222239.4 9222358.3

7°2’04.10” 7°2’00.04” 7°1’56.17”

112°39’37.52” 112°39’38.30” 112°39’39.76”

11°04’07.191” 20°45’25.196” 20°45’23.199”

IP5 IP6 IP7 IP8 IP9 IP10 IP11 IP12 IP13

11.961 12.462 12.897 14.463 15.962 16.963 18.464 20.461 24.461

684145.2 684318.0 684484.0 685076.8 685648.6 686021.3 686595.6 687364.9 688895.6

9224122.8 9224593.7 9224996.0 9226445.2 9227830.8 9228759.9 9230146.3 9231989.4 9235685.3

7°0’58.65” 7°0’43.30” 7°0’30.12” 6°59’42.94” 6°58’57.77” 6°58’27.49” 6°57’42.29” 6°56’42.21” 6°54’41.72”

112°40’01.34” 112°40’06.91” 112°40’12.28” 112°40’31.42” 112°40’49.89” 112°41’01.92” 112°41’20.47” 112°41’45.32” 112°42’34.75”

20°09’03.456” 22°25’20.585” 22°14’49.834” 22°25’28.661” 21°51’27.861” 22°30’04.358” 22°39’19.418” 22°29’50.858” 22°25’53.783”

TP5 IP14 TP6

25.114

689144.7 689621.7 688571.0

9236288.6 9237444.2 9238121.7

6°54’22.06” 6°53’44.38” 6°53’22.45”

112°42’42.79” 112°42’58.19” 112°42’23.89”

22°25’53.535” 302°48’45.774” 302°48’45.558”

TP7 IP15 TP8

37.980 40.159

679509.4 678389.3 677540.3

9243964.3 9244686.5 9243659.1

6°50’13.29” 6°49’49.91” 6°50’23.44”

112°37’28.09” 112°36’51.53” 112°36’23.99”

302°48’45.404” 219°34’07.798” 219°34’07.741”

IP16

41.175

676893.1

9242875.9

6°50’49.01”

112°36’02.99”

219°34’19.649”

Proposed 41.224 676861.7 Platform

9242837.9

6°50’50.25”

112°36’01.98”

N/A

N/A

N/A 27.198

N/A

Bearing

o

Spheroid WGS84, Datum WGS-84 CM 111 E (UTM ZONE 49)

Notes : Radius used for curves is 1500 m. Table 1

Coordinates of the Proposed Pipeline Route

5 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

The above centreline coordinates were provided by client with the exception of where the route followed the Kodeco line where a 50 m offset west of the line was developed in the field. Coordinates of the centreline are presented in Table 1. After the first draft report has been submitted, the Client requested to move the Landing Point, KP 0.0 to some 200 m southeast from the original location. It is therefore no bathymetric data along the first kilometre (from KP 0.0 to KP 1.0. Geotechnical samples were collected along the proposed route at 1 km intervals however intervals were varied at times to allow sampling in areas of changing geology. A total of 37 seabed samples were collected with intervals varying from 300 m to 2 km. 2.3

Survey Objectives The objectives of the pipeline route survey were as follows: a.

To assist in identifying the most suitable route and identify potential hazards or factors that may have operational significance for pipeline emplacement and foundation i.e. seafloor obstructions, seafloor depressions, near seabed channelling etc.

b.

To accurately define the water depth and seabed topography along the survey route.

6 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

2.4

Service Warranty The Service Warranty in Appendix D outlines the limitations of this report, in terms of a range of considerations including, but not limited to, its purpose, scope, the data on which it is based, its use by third parties, possible future changes in design procedures and possible changes in site conditions with time. It should be noted that the Service Warranty does not in any way supersede the terms and conditions of contract between Amerada Hess (Indonesia-Pangkah) Limited (AHL) and PT Kalvindo Raya Semesta (PTKRS).

7 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

Figure 1

General Location Map.

8 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

3.

GEODETIC PARAMETER OF SURVEY LOCATION The Geodetic Parameters for the survey are as follows:

3.1

Geodetic Spheroid Datum Semi-major axis Semi-minor axis Eccentricity Inv. Flattening

3.2

WGS 84 WGS 84 6 378 137.000 m 6 356 752.314 m 0.006 694 380 298.257223563

: : : : : : : :

Universal Transverse Mercator (UTM) Equator (00) 1110 East (Zone 49) 0.999 600 500 000 m 10 000 000 m (Southern Hemisphere) International Grid Metres World Standard

Projection Projection Latitude of Origin Central Meridian Scale Factor at CM False Easting False Northing Unit of co-ordinate Convergence

3.3

: : : : : :

Miscellaneous Historically different geodetic parameters have been used in the Ujung Pangkah block and caution should be exercised when using old survey data where the geodetic parameters are not clearly defined. Previous block owner Premier Oil Pangkah used different geodetic parameters which are listed below for information only. Parameters used by Premier Oil Pangkah Limited: Spheroid Datum Semi-major axis (a) Inv. Flattening Projection Latitude of Origin Central Meridian Scale Factor at CM False Easting False Northing Unit of co-ordinate Convergence

: : : : : : : : : : : :

Bessel (1841) Batavia (Jakarta) 6 377 397.155 m 299.15281 Universal Transverse Mercator (UTM) Equator (00) 1110 East (Zone 49) 0.999 600 500 000 m 10 000 000 m (Southern Hemisphere) International Grid Metres World Standard

9 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

Transformation from WGS 84 to Batavia (Jakarta) dX dY dZ

: +483.483 m : -681.000 m : +50.000 m

The Kodeco Energy pipeline has been laid and data based using geodetic parameters different again to the Premier Oil parameters. Parameters used by Kodeco Energy: Spheroid Datum Semi-major axis (a) Inv. Flattening Projection Latitude of Origin Central Meridian Scale Factor at CM False Easting False Northing Unit of co-ordinate Convergence

: : : : : : : : : : : :

Bessel (1841) SNS - K11 6 377 397.155 m 299.152812858 Universal Transverse Mercator (UTM) Equator (00) 1110 East (Zone 49) 0.999 600 500 000 m 10 000 000 m (Southern Hemisphere) International Grid Metres World Standard

Transformation from WGS 84 to Local Datum (SNS - K11) dX dY dZ

: +383.39 m : -670.67 m : +52.92 m

10 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

4.

DATA PROCESSING AND INTERPRETATION

4.1

Navigation Data Processing Real-time logging of navigation and bathymetric data was implemented using Fugro’s Starfix.Seis navigation software. Preliminary data processing was carried out in Graha Hotel, Gresik using Fugro's in-house processing software Starfix.Proc. Final chart production was done at the PTKRS regional geophysical data processing centre in Jakarta. Track plots to 1:5,000 scale referred to the position of the ship’s datum, echo sounder transducer, side scan sonar tow fish, SBP transducer and magnetometer were processed and plotted on a four-panel alignment chart. The alignment chart was used as base maps for the interpretation of the geophysical data.

4.2

Tidal reduction and Bathymetry processing Fugro’s in-house software, Starfix.Proc, was utilised to reduce the bathymetric sounding data to Lowest Astronomical Tide (LAT), using the Tidal Harmonic Constants from 3 tide stations Surabaya, Karang Jamuang and Ujung Pangkah. The tide harmonic constants are lifted from the Admiralty Tide Tables and are in the local time zone. ML (LAT) Z0 (m) 1.39* 1.05** 1.10***

M2 g° 318 111 016

h (m) 0.35 0.03 0.05

S2 g° 334 357 356

h (m) 0.21 0.06 0.08

K1 g° 312 318 318

h (m) 0.47 0.51 0.54

O1 g° 265 264 259

h (m) 0.26 0.24 0.26

Notes: Local Time is GMT + 7hrs * Port of Surabaya ** Ujung Pangka tide station *** Karang Jamuang tide station Table 2

Tide Harmonic Constants for Surabaya, Ujung Pangkah and Karang Jamuang

A graph of the three predicted tides during the duration of the survey is shown in Appendix B. The processed bathymetry is presented in panel 1 of each Alignment Chart. During the survey, temperature and velocity of sound in seawater against 11 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

depth were measured. Appendix C contains the profiles recorded during the course of the survey. The swath bathymetric was processed at 5 m x 5 m bin size. 4.3

Interpretation and Reporting Data interpretation and reporting were carried out at the PT Kalvindo Raya Semesta office in Jakarta, Indonesia. Mapping of features and events on the side scan records and sub-bottom profiler records, as well as bathymetric contouring at 0.5 m intervals was conducted using both manual and automated methods. Drawings of interpretations were digitised and plotted using AutoCAD release 14. All digital drawing files are in AutoCAD (*.DWG) format. The report text is in Microsoft Word 97 (*.DOC) format.

12 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.

SURVEY RESULTS All navigation and geophysical survey data acquired in the field have been interpreted and presented in an alignment chart to A0 size and in horizontal scale 1:5,000.

5.1

Bathymetry [Refer to the attached alignment chart, No. S1198-01/01 to 10, Panel 1] The acquired sounding data is of good quality. The reduced bathymetry data and sounding contours provide accurate water depth and well defined seabed topography along the proposed pipeline route. All the bathymetry data was reduced to the Lowest Astronomical Tide (LAT) by using interpolation predicted tides from three tide stations, Surabaya, Karang Jamuang and Ujung Pangkah. The bathymetric descriptions are as follow: Inshore/ very shallow area Covers from the Landing area to the top of an east-west dipping zone, lying at KP 3.66. This area is essentially flat and lies above the Lowest Astronomical Tide (LAT) datum. The seabed elevation varies from 0 m to 0.8 m above LAT, which means it becomes dry during lowest low water. A narrow shallow channel is discernible within this area which crosses the route in a northwestsoutheast direction. Channel width varies between 150 and 170 m with maximum depth of 1.8 m below LAT. The channel axis crosses the proposed route at KP 1.48. The LAT datum contour occurs around KP 1.43 and KP 1.64 along shallow channel edges and KP 3.66 along the top of dipping zone Dipping Zone This is a transitional zone, shallow water to deeper water. In general, the top of this zone lies at 0 m LAT and then dips steeply to deeper water. The zone covers a width of approximately 70 m to 120 m, while the depth of its base ranges from 7 m to 9 m below LAT. This zone stretches in north south direction and dips to the east with the seabed gradient from 1:10 to 1:15. On the route centre line the top and base of this zone lies at KP 3.66 and KP 3.81 respectively with a gradient of 1:20. Offshore area Starting from KP 3.81, the base of the dipping zone, the seabed varies from smooth, gently sloping and slightly wavy to irregular. In general the gently sloping seabed gradient is less than 3°, with the exception of where the route crosses the coral and or calcarenite/ dense sands areas between KP 6.7 and KP 9.3. Figure 2 illustrates a smooth and slightly wavy seabed within a sandy area. Figure 3 illustrates slightly wavy seabed with minor irregularities within

13 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

calcarenite/ dense sand area. Figure 4 illustrates wavy to irregular seabed within the coral area. The slightly wavy to irregular seabed occurs along the calcarenite/ dense sand and coral areas between KP 6.7 and KP 9.5. Water depth within the coral area varies from 7.5 m around KP 8.8 to 16.5 m around KP 8.0. The possibility of pipeline free spanning is likely around KP 7.67, KP 7.9 and KP 8.0 within the coral/ calcarenite (dense carbonate sand), and around KP 10.4 and KP 10.9 within the sandy areas. Shallow water of 6 m or less depth occurs between KP 20.0 and KP 31.0. The maximum depth is 27.3 m is located around KP38.3, while the minimum depth of 4.1 m is located around KP. 27.0. The water depth at the proposed platform location is 8.7 m below LAT.

14 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

ANALOGUE DATA RECORD JOB No. : S.1198 Client : AMERADA HESS

12m

PROJECT : Pipeline Route Survey EQUIPMENT : Echotrack MK II VESSEL : M.V. Sejati Berkah

Heave Compensator

SW

High Topography, Rounded to Slight Wavy Sensor Digitiser

14m

Seabed

NE

Uncorrected Water Depth

16m

18m

20m

22m

50 m 24m

2m 26m

Example of echo sounder data, southwest to northeast line AHLUP-CL-S1 showing a rounded to slight wavy seabed around KP 6.15

FIGURE 2

ANALOGUE DATA RECORD JOB No. : S.1198 Client : AMERADA HESS

PROJECT : Pipeline Route Survey EQUIPMENT : Echotrack MK II VESSEL : M.V. Sejati Berkah

Heave Compensator

0m

SW

NE 2m

Uncorrected Water Depth

4m

6m

Minor Irregularities seabed Sensor Digitiser

8m

Seabed

10 m

50 m 12 m

2m 14 m

Example of echo sounder data, southwest to northeast line AHLUP-CL-S1 showing smooth to slight wavy with minor irregularity seabed around KP 7.0

FIGURE 3

ANALOGUE DATA RECORD JOB No. : S.1198 Client : AMERADA HESS

PROJECT : Pipeline Route Survey EQUIPMENT : Echotrack MK II VESSEL : M.V. Sejati Berkah

Heave Compensator

0m

SW

NE 2m

Uncorrected Water Depth

4m

6m

Sensor Digitiser

Irregular Seabed

8m

Seabed 10 m

50 m 12 m

2m 14 m

Example of echo sounder data, southwest to northeast line AHLUP-CL-S1 around KP 8.6 showing the irregular Seabed

FIGURE 4

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.2

Seabed Sediments and Features [Refer to the attached alignment chart, No. S1198-01/01 to 10, Panel 2] The side scan sonar data are of reasonably good quality, however the noisy environment in the shallow water areas did degrade data quality. The side scan sonar data has been interpreted to provide seabed information, including all discernible seabed features. Debris, coral or rock outcrops, manmade features, etc., may pose a constraint to seabed construction. The side scan sonar data is correlated with the recovered geotechnical samples to help identify the general seafloor lithology and its variations. A total of 37 seabed samples were collected along the proposed route. Seabed Sediments The seabed sediments along the route consist of loose sands, calcarenite/ dense sands, coral, and soft clay. The lithological boundary is depicted using a combination of side scan sonar and sub-bottom profiler data. However, sometimes the boundary between soft clay and fine loose silty sand is not able to be defined clearly. The loose sand area is characterised by low to moderate reflectivity, depicting a smooth and featureless seabed. Three main areas of loose sands occur on the route , these being KP 4.0 to KP 6.1, KP 9.6 to KP 11.8 and KP 24.2 to KP 27.65. Loose sands also occur in between the calcarenite/ dense sand and coral areas. Seabed rippling occurs around KP 11.8. Orientation of the ripples are generally in a southwest-northeast direction, indicating the predominant seabed current within this area is northwest – southeast direction. The sand areas are illustrated as data samples in Figures 5, 6, 7, 10, 11, 13 and 14. The calcarenite/ dense sands and coral is characterised by moderate to high sonar reflectivity and usually form a smooth to irregular seabed. This area occurs between KP 6.7 and KP 9.3. Refer Figures 6, 10, 11 and 12. The soft clay areas are generally characterised by low sonar reflectivity. The soft clay areas are illustrated in Figures 8, 9, 13, 15 and 16. Seabed Features Several seabed features have been identified as follow. 14” Gas pipeline. This pipeline is operated by Kodeco Energy to transfer gas from the offshore CPP platform (some 60 km northeast of Gresik) to shore. This pipeline has been surveyed from KP 4.0 to KP 25.5. The buried sections of the 14” gas pipeline are presented in Table 3. A significant free span with 70 m length and 2.5 m height occurs around KP 7.68, refer to Figure 11

18 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

KP’s Start - End 8.04-8.19 9.25-9.35 9.64-10.45 12.81-14.42 21.42-22.8 23.27-23.51 23.545-25.5

Table 3

(START)

(END)

Easting (m)

Northing (m)

Easting (m)

Northing (m)

683114.32 683355.52 683459.24 684496.77 687780.92 688487.15 688592.03

9220358.38 9221538.96 9221913.57 9224895.84 9232854.21 9234564.65 9234818.84

683141.0 683382.05 683713.84 685106.37 688307.92 688578.67 689347.00

9220503 9221635.08 9222672.62 9226385.93 9234130.17 9234786.49 9236640.00

Buried sections of the Kodeco 14” gas pipeline

Fishing Kellongs. These structures are constructed of individual bamboo poles embedded in the seabed with fishing net strung between to create a fish trap. The kellongs are found around KP 4.2, KP 7.5, KP 10.5 and KP 16.2, some of them are situated on the proposed route, refer Figures 5 to 9. Navigation buoy. One navigation buoy was found about 100 m east of KP 4.2, see Figure 5 and Table 4. Debris. Several debris were identified from the side scan sonar records. Magnetometer data was used to confirm whether the debris was metallic in nature. The coordinates of the debris are provided in Table 4. Seabed Features Navigation Buoy Linear debris Debris Linear debris Debris Debris Linear debris Section of pipeline Debris Debris Debris Linear debris Linear debris Debris

Size L x W, Easting Height (m) (m) N/A *** 682445

Northing (m) 9216530

Distance Direction/ KP 100m E/ 4.20

L=40 *** 0.5x0.5, 0.2 L=3 0.5x1, 0 0.5x0.5, 0 L=8 L=890 ***

9217352 9217165 9219555 9220790 9222225 9223055 9223455 9224315 9226555 9227997 9230680 9232510 9235413 9239030

90m W/ 4.95 180m E/ 4.80 100m E/ 7.22 50m W/ 8.45 200m E/10.00 200m E/10.90 50 to 75m W/ 11.2312.125 150m NW/14.53 195m SE/16.22 100m NW/ 19.00 100m NW/ 21.00 150m NW/ 24.10 100m NE/ 28.72

0.5x0.5, 0 0.5x0.5, 0 0.5x0.5, 0 L=5 L=4 0.5x0.5, 0

682405 682656 683012 683100 683650 683955 683845 684135 684960 685925 686702 687472 688625 687347

(m)

Notes: *** magnetic object Table 4

Coordinates of debris

It is advisable to visually check with divers the linear debris located between 19 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

KP 11.23 and KP 12.125, offset 50 m to 75 m west of the proposed route. This is suspected to be abandoned pipeline section., see Figure 13. Seabed depression and pockmarks. Several seabed depressions and pockmarks are discernible along the route. Depth of the features are less then 0.5 m with diameters varying from 10 to 60 m. The depressions generally occur within clayey sediments and are not expected to effect the pipeline dsign. Seabed Scars. A few seabed scars are discernible along the route, with length to 100 m and depth less than 0.5 m.

20 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

S

N

Kellong

100 m (25m per div.)

Approximate Proposed Pipeline Route

Predominantly loose sand

14” Gas Pipeline To CPP resik To G

50m

Navigation Buoy 9

8

7

6

5

4

3

2

1

Example of side scan sonar record, south to north line UP_CL_IF_SIA showing the kellong area around KP 4.3 and 14” Gas Pipeline CPP to Gresik

FIGURE 5

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

W

100 m (25m per div.)

70

71

72

73

74

75

78

77

76

E

Calcarenite/ dense sand 50m

Approximate Proposed Pipeline Route

Smooth seabed (loose sand)

Calcarenite Area

Kellong Area

Example of side scan sonar record, east to west line AHLUP_ X08, showing the kellong and calcarenite area around KP 7.5

FIGURE 6

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

NW

1037

1038

1039

1040

1041

1042

1044

1043

SE

Approximate Proposed Pipeline Route

sik to Gre

Predominantly loose silty sand with clay pockets

Kellong Area

CPP ipeline P s a 14” G

100 m (25m per div.)

50m

Example of side scan sonar record, southeast to northwest line UP_KP10_IF_04, showing the kellong area around KP 10.6

FIGURE 7

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

NW

998

999

1000

1001

1002

1003

1004

SE

Approximate Proposed Pipeline Route

Predominantly soft clay with localised sand

Kellong Area

as ”G 14 e lin pe Pi

Kellong Area

P CP to ik es Gr

100 m (25m per div.)

50m

Example of side scan sonar record, southeast to northwest line UPKP16_IF_07 showing the kellong area around KP 16.2

FIGURE 8

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW 100 m (25m per div.)

NE

14” Gas Pipeline CPP to Gresik

Kellong Area

50m

Predominantly soft clay with locally sand pockets

Debris d=0.5mX0.5m h=0

538

537

536

535

534

533

532

531

530

529

Example of side scan sonar record, southwest to northeast line UP_WE2_C showing the kellong and debris area around KP 16.2

FIGURE 9

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW

100 m (25m per div.)

NE

Fine to Medium Sand Limit of smooth sand and calcarenite/dense sand areas

Approximate Proposed Pipeline Route

14” Gas Pipeline CPP to Gresik

50m

Calcarenite/dense sand Area 29

28

27

26

25

24

23

22

21

Example of side scan sonar record, southwest to northeast line AHLUP_CL_S1, showing the boundary between smooth sand and calcarenite areas, around KP 6.7

FIGURE 10

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW

NE

100 m (25m per div.)

Coral

Coral / Calcarenite

Sand

Sand

Approximate Proposed Pipeline Route

50m 70 Free span L =

m H = 2.5m

14” Gas Pipeline CPP to Gresik Coral 49

48

47

46

45

44

43

42

41

Example of side scan sonar record, southwest to northeast line AHLUP_ CL_S1A, showing a pipeline span around KP 7.7

FIGURE 11

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW

NE

100 m (25m per div.)

Coral Area

Approximate Proposed Pipeline Route

Irregular Seabed

50m

14” Gas Pipeline CPP to Gresik

Coral Area

72

71

70

69

68

67

66

65

Example of side scan sonar record, southwest to northeast line AHLUP_ CL_S1, illustrating the corraline area around KP 8.7

FIGURE 12

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW

100 m (25m per div.)

NE

SAND RIPPLE AREA

Linear Debris, Suspected to be abandoned pipeline section

Depression

50m

Clay 247

246

245

243

242

241

240

239

238

237

236

Example of side scan sonar record, southwest to northeast line UP_S2_WW2, illustrating sand ripple area and linear debris around KP 11.8

FIGURE 13

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

SW

104

105

106

107

108

109

110

111

112

NE

SANDY AREA

100 m (25m per div.)

50m

SANDY AREA

Example of side scan sonar record, northeast to southwest line AHLUP_CL_S3E illustrating sand area around KP 24.5

FIGURE 14

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

NW

100 m (25m per div.)

SE

SMOOTH SEABED (SOFT CLAY)

50m

SMOOTH SEABED (SOFT CLAY)

865

864

863

862

861

860

859

858

857

Example of side scan sonar record, southwest to northeast line UP_S4_WW2 illustrating the smooth seabed consist of clay around KP 30.0

FIGURE 15

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : GeoAcoustics 159D (100m range, 100KHz) : M.V. Sejati Berkah

NW

100 m (25m per div.)

SE

CLEAR AREA (No debris or sonar contact)

50m

CLEAR AREA (No debris or sonar contact)

Soft Clay

841

840

839

838

837

836

835

834

833

Example of side scan sonar record, southwest to northeast line AHLUP_CL_Y illustrating the clear area (no debris or sonar contact) KP 31.2

FIGURE 16

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.3

Magnetometer anomaly (Refer to the enclosed drawing, No. S1198/01/02 to 10, Seabed Features and Magnetic anomalies) A magnetometer is an instrument that is used to measure the value of the earth’s magnetic field. Measurements are used to identify the physical characteristics of the objects or structures that have produced the readings. For example, shipwreck produces magnetic “signature” that appear on magnetometers as “anomalies” or noticeable deviations from the usual intensity of the earth’s magnetic field in that sector of the ocean floor. The unit of measurement used to express the intensity of the earth’s magnetic field is the gamma (1 gamma equals 10-5 gauss or 10-9 tesla or 1 nanotesla). The diurnal variation of the magnetic field was not monitored during the survey, which would have required setting up a base station using a second magnetometer. Nevertheless, based on the recorded data no abnormal significant variations of total magnetic field were recorded, which could be attributed to sunspot activity and possible magnetic storm. A number of magnetic anomalies were noted along the route. The strength of these anomalies vary from 4 to 80 gammas but most of them are in a range of 10 to 30 gammas. Generally the anomalies could not be identified from the side scan sonar data and therefore one must assume the cause of the anomaly is buried. Sample data recorded as the sensor crossed the 14” gas pipeline is illustrated in Figure 17. A significant magnetic anomaly was recoded for a seabed object suspected to be an abandoned pipeline offset 50m and 75 m west from the proposed route at KP11.23 to KP12.125, see Figure 18. Figure 19 illustrate a significant magnetic anomaly occurring at around KP31.2 but the object could not be identified in the side scan sonar records. The coordinates of magnetic objects are as follow. Magnetic Intensity (nano Tesla/ gammas) A=25 *** A=5 *** A=25 *** A=24 *** A=10 *** A=27 *** A=10 *** A=30 *** A=7 *** A=4 *** A=11 ***

Easting (m) 682355 682550 682600 682645 683795 684175 686000 686100 686575 688607 688765

Northing (m) Distance (m) Direction/ KP 9217215 9217855 9218155 9218715 9223215 9224595 9228852 9229285 9229785 9234640 9235070

33 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

120m W/ 4.80 50m W/ 5.47 60m W/ 5.775 110m W/ 6.33 50m W/ 10.97 125m W/ 12.41 55m W/ 10.04 125m W/ 17.48 115m E/ 18.11 120m SE/ 23.38 115m SE/ 23.85 Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

A=80 *** A=40 *** A=30 ***

685100 685190 685175

9240275 9240315 9240365

Around KP 31.25 These 3 anomalies probably produced by one object

Notes :

*** Buried

Table 5

Coordinates of magnetic anomalies

34 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : SeaSPY Magnetometer : M.V. Sejati Berkah

W

E

50m

10nt (gammas) Curve

Magnetic Anomaly

14” Gas Pipeline

100nt (gammas) Curve

1 nanno Tesla (nT) or 1 gamma

Magnetic Anomaly

Example of magnetometer record, east to west line AHLUP_X8, KP 4.3 showing the magnetic anomaly across 14” Gas Pipeline

FIGURE 17

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : SeaSPY Magnetometer : M.V. Sejati Berkah

SW

NE

100 nT (Gamma) Scale

10 nT (Gamma) Scale

1 nT Magnetic Anomaly Across a Suspected Abandoned Pipeline Section

50m

Example of magnetometer record, southwest to northeast line UP_S2_WW1 showing the magnetic anomaly along the suspected abandoned pipeline section, at and around KP 11.5

FIGURE 18

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

PROJECT EQUIPMENT VESSEL

: Pipeline Route Survey : SeaSPY Magnetometer : M.V. Sejati Berkah

NW

SE

50m

10 nT (Gamma) Scale

Magnetic Anomaly (probably metal object) 1 nT per div

Example of magnetometer record, southeast to northwest line UP_S4_WW1 showing the magnetic anomaly (probably buried metal) at and around KP 31.2

FIGURE 19

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.4

Sub-seabed Geology [Refer to the attached alignment chart, No. S1198-01/01 to 10, Panel 3] All sub-bottom profiler data are of reasonably good quality, but sound source penetration is variable due to lithological factors. In the area near Gresik, the origin lithology (calcarenite/ coral) may dominantly control the recent seabed sediments. While in the area near Ujung Pangkah external factors such as the Bengawan Solo river may dominantly affect the type of recent seabed sediments (usually mobile very fine sediments). The sub-bottom profiler data was acquired using a pole mounted 2 by 2 pinger transducer array. The time to depth conversion of sub-bottom profiler data used assumed velocity of sound propagation in unconsolidated shallow sediments of 1600 metres per second. All sub-bottom profiler data was recorded with print sweep (two way time) of 50 to 60msec. All depths herein are quoted in metres below seabed (m BSB).

5.4.1

Shallow Zone Stratigraphy The stratigraphy along the very shallow zone KP 0 to KP 4.0 is not defined herein, since no seismic or geotechnical data was recorded. In view of the geological complexity of the remainder of the route and to simplify the stratigraphic description, the route has been divided into sections.

5.4.1.1

Section 1, KP 4.0 to 6.1 Superficial Sediments Augmented with geotechnical drop core samples GUP-DC01 and 02, the superficial sediments are interpreted to consist of predominately fine loose sand with shell fragments. Unit thickness is approximately 2.m. Underlying the superficial sediments are cross-bedded sedimentary sequences, channel-fill, and what is interpreted to consist of cross-bedded silty sand. The depth to the base of cross bedded silty sand varies from 4 to 9 m below seabed. Deeper sequences could not reliably be interpreted because of the limited sub-bottom profiler penetration Figures 1 and 2 illustrate the sedimentary sequences within this section.

38 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.4.1.2

Section 2, KP 6.1 to KP 9.5 From the geotechnical drop core samples GUP DC03, GUP-DC05, GUP DC36, GUP DC37, GUP DC06 and GUP DC08, the seabed within this section consists predominantly of calcarenite/ dense sand and coral. The superficial sediments of loose sand occurs in the areas between the two seabed highs of coral/ calcarenite, forming channel fill deposits. The thickness of these superficial channel fills varies from 1 m to 8.5 m, see Figures 21, 22 and 23. The geotechnical samples identified by GUP-DC04, and GUP-DC 07 have been collected from these areas. Very limited or no sub-bottom profiler penetration was recorded along the coral and calcarenite areas, but limited penetration along the channel-fill areas was also seen. The sediment underlying these areas could not be reliably determined, but is expected to consist of very hard silty sand/ clayey sands.

5.4.1.3

Section 3, KP 9.5 to KP 42.25 (Proposed Platform-A) Sub-bottom profiler records show weak to strong, regular-parallel reflectors. In several areas limited sub-bottom profiler penetration occurs which is probably due to the presence of organic material within the sediments. Seabed samples collected along this section were found to consist of sand and soft clay. The pinger resolution enables sand layers greater than 0.6 m thick to be identified. For thinner layers the drop core samples were used for seismic correlation. The superficilal sediments were found to consist of thin sand and soft clay. This thin sand blankets the seabed from KP 9.5 to KP 11.8 and from KP 24.2 to 27.65, based on seabed samples GUP-DC09, GUP-DC10, GUP-DC09, GUP-DC20, GUP-DC21 and GUP-DC22. It’s thickness varies from 0.5 m to 1.5 m. Limited pinger penetration occurs in these sand areas with the maximum pinger penetration seen being 9 m below seabed. Overlying this superficial sand are well laminated layers, interpreted to consist predominantly of soft to firm sandy clays. The superficial very soft to soft clay occurs from KP 11.8 to KP 24.2 and from KP 27.65 to KP 41.225 (proposed platform location). Deeper pinger penetration to approximately 20 m below seabed occurs between KP 14.5 and KP 21.5 and from KP 35.5 to KP 39.0. Along these two sections, the superficial sediments of soft clay overlies thick sequences which are mostly characterised by horizontal laminated layers and is interpreted to consist of soft to firm clay. Stiff to very stiff clay is expected to be at levels 10 to 15 m below seabed. Due to limited pinger penetration between KP 11.8 to KP 13.5, the sediment sequences below the superficial sediments could not be accurately

39 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

determined. However it is believed from the available data that these sedimentary sequences will be firm sandy clays. Limited pinger penetration occurred between KP 11.8 to KP 13.5, and from KP 28.0 to KP 35.5. Within this section, underlying the superficial sediments are well laminated layers, interpreted to consist of soft to firm clay. Similarly limited pinger penetration occurs between KP 28.0 and KP 35.5, KP 39 and KP 41.225 (proposed platform). The limited penetration along these sections is probably due to the presence of organic matter within the sediments. Due to the limited acoustic penetration, the sediments below the superficial sediments could not determined. However extrapolation from nearby recorded seismic records pegs the thickness of the soft clay at approximately 15 m. Bore hole data (UP2 BH-2) from a location approximately 170 m north west from the proposed platform (see Appendix A), indicates a boundary between soft/ firm clay and stiff/ very stiff clay lies 30 m below seabed. Referencing report from Premier Pangkah Limited (Report No. S0821-03), the boundary between soft/ firm and stiff/ very stiff clay is relatively horizontal. This boundary is interpreted to extend north/ northeast along the proposed route. (see Drawing No S1198-01/09 and S1198-01/10) Extrapolation from this borehole data, the boundary between soft/ firm and stiff/ very stiff clays from KP 35.5 to KP 39.0.lies 14 m below seabed. 5.4.2

Shallow Geological Structure Several palaeochannels were observed between KP 13.5 and KP 14.8. The channel width varies from 250 m to 400 m and extending east/ west beyond the limit of the survey. The interbedded infill sediments are predicted to consist of silty clay interlayered with silt and sand interbeds with coarser materials expected at the bottom or base of the channel.

40 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

SW

PROJECT EQUIPMENT VESSEL

NE

100 m

Seabed Minor reflector Fine loose SAND to medium dense Fine loose SAND, to medium dense

Dense to very dense silty Sand Channel

Limited Penetration

8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler (pinger) record, southwest to northeast, line AHLUP_CL_S1A illustrating sand sequences around KP.5.3

FIGURE 20

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

22

21

20

19

18

17

16

15

14

13

12

11

10

09

08

SW

PROJECT EQUIPMENT VESSEL

NE

100 m

Seabed

Fine loose SAND, to medium dense

Calcarenite (Dense Sand)

Fine loose SAND, to medium dense

Minor reflector

Channel

Multiple Seabed 8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler (pinger) record, southwest to northeast, line AHLUP_CL_S1 passing through area of calcarenite/dense sand at and around KP.6.2

FIGURE 21

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

SW

PROJECT EQUIPMENT VESSEL

NE

100 m Coral Area Calcarenite / Dense Sand

Coral with scattered sand / fragments

Seabed

Loose Sand

Loose Sand

R1

Seabed Multiple

R1

8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler (pinger record), southwest to northeast, line AHLUP_CL_S1, passing through the coral area at and around KP.7.9

FIGURE 22

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

89

88

87

86

85

84

83

82

81

80

79

78

77

76

75

SW

PROJECT EQUIPMENT VESSEL

NE

100 m Coral

Loose Sand

Dense Sand with Coral Well Laminated (Alternating Sand and Clay/Silt)

Seabed

Probable: very dense salty sand

Seabed Multiple

8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler (pinger record), southwest to northeast, line AHLUP_CL_S1 passing through areas of coral, sand at and around KP.9.5

FIGURE 23

426

427

428

429

430

431

432

433

434

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

435

437

438

SW

PROJECT EQUIPMENT VESSEL

436

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

NE

100 m

Seabed

Very Soft CLAY Sandy Clay

Deep Channel 8m per division (10ms at 1600 m/s)

Example of pinger sub-bottom profiler (pinger record), northeast to southwest, line AHLUP_CL_S2_A illustrating areas of very soft CLAY and deep channel at and around KP.14.5

FIGURE 24

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

457

456

455

454

453

452

451

450

449

448

447

446

445

444

443

442

441

440

439

438

SW

PROJECT EQUIPMENT VESSEL

NE

Seabed

100 m Very Soft CLAY

Well Laminated Sandy Clay

Enhanced Reflector (Possibly Top of Dispersed Biogenic Gas)

8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler (pinger record), southwest to northeast, line UP_S3_WE1 illustrating areas of enhanced reflector (possibly top of disperse gas) at and around KP.17.5

FIGURE 25

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Surve : Pinger Geo-Acoustics system : M.V. Sejati Berkah

287

100 m

286

285

284

283

282

281

280

279

278

277

276

275

274

273

272

271

270

269

SW

PROJECT EQUIPMENT VESSEL

NE

Seabed Very Soft CLAY Sandy Clay

Silty Clay

Acoustic Attenuation Zone Probable top of Disperse Gas

8m per division (10ms at 1600 m/s)

Example of sub-bottom profiler recordpinger record, southwest to northeast, line UP_S3_WE1 illustrating acoustic attenuation area at and around KP.21.5

FIGURE 26

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Survey : Pinger Geo-Acoustics system : M.V. Sejati Berkah

775

774

773

772

771

770

769

768

767

766

765

764

763

762

761

760

759

758

NW

PROJECT EQUIPMENT VESSEL

SE

100 m Seabed Very Soft CLAY Silty Clay

8m per division (10ms at 1600 m/s)

Example of pinger record, northwest to southeast, line AHLUP_CL_Y illustrating Significant accoustic attenuation at and around KP 34.6

FIGURE27

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Survey : Pinger Geo-Acoustics system : M.V. Sejati Berkah

731

730

729

728

727

726

725

724

723

722

721

720

719

718

717

716

715

714

713

712

NW

PROJECT EQUIPMENT VESSEL

SE

100 m Seabed Very Soft CLAY

Soft to Firm Clay

Stiff Clay

Stiff to Very Stiff Clay 8m per division (10ms at 1600 m/s)

Example of pinger record, northwest to southeast, line AHLUP_CL_Y illustrating the lithological sequences at and around KP 37.0

FIGURE 28

ANALOGUE DATA RECORD JOB No. : S.1189 Client : AMERADA HESS

: Pipeline Route Survey : Pinger Geo-Acoustics system : M.V. Sejati Berkah

658

657

656

655

654

653

652

651

650

649

648

647

646

645

SW

PROJECT EQUIPMENT VESSEL

NE

100 m

Seabed Very Soft CLAY Significant acoustic attenuation probably due to the presence of organic matters

Enchanced Reflector 8m per division (10ms at 1600 m/s)

Example of pinger record, southwest to northeast, line AHLUP_CL_Y illustrating acoustic attenuation at and around KP 40.3

FIGURE 29

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

5.5

Geotechnical Investigation Upon completion of the geophysical survey, a geotechnical investigation was performed using the same vessel. This work was carried out over 4 days commencing the 25 January 2003. The samples were collected using a gravity corer with a 3 m length core barrel, deployed astern from a “A” frame. A total of 37 samples were collected. attached in Appendex A.

A detailed geotechnical report is

Positions of Drop Coring Samples: (Co-ordinates are in WGS-84, Central Meridian : 111° E) Location

KP’s

Easting

Northing

Recovery (m)

Remark’s

GUP-DC01

4.0

682 302.9

9 216 402.38

2.1

Core-barrel was bent

GUP-DC01A

4.0

682 302.34

9 216 401.82

2.1

Core-barrel was bent

GUP-DC02

5.17

682 544.88

9 217 546.03

2.4

GUP-DC03

6.17

682 723.79

9 218 521.85

0.1

GUP-DC04

6.5

682 790.29

9 218 849.05

1.4

GUP-DC04A

6.5

682 789.57

9 218 852.90

1.4

GUP-DC05

7.08

682 885.88

9 219 420.54

7.08

682 946.08

9 219 775.14

GUP-DC36

Sling-wire broke, core barrel lost to seabed

GUP-DC36

7.43

682 952.78

9 219 771.83

0.5

GUP-DC06

7.95

683 046.08

9 220 274.47

0.1

683 056.50

9 220 270.38

GUP-DC37

8.29

683 116.15

9 220 615.87

0.1

GUP-DC07

8.43

683 143.10

9 220 741.10

2.2

GUP-DC08

9.05

683 264.90

9 221 355.34

0.1

GUP-DC08A

9.05

683 258.41

9 221 359.86

0.1

GUP-DC09

10.14

683 503.05

9 222 421.69

2.8

GUP-DC10

11.8

684 088.73

9 223 973.60

1.4

GUP-DC10A

11.8

684 093.59

9 223 970.90

1.9

GUP-DC11

12.64

684 382.15

9 224 753.89

2.4

GUP-DC12

13.91

684 869.37

9 225 927.10

2.4

GUP-DC13

15.5

685 471.87

9 227 402.87

2.4

GUP-DC14

16.5

685 850.74

9 228 328.15

2.4

GUP-DC15

17.5

686 217.23

9 229 256.23

2.4

GUP-DC16

20.0

687 189.41

9 231 564.63

2.7

GUP-DC17

21.8

687 884.25

9 233 223.79

2.5

GUP-DC18

23.0

688 339.82

9 234 334.72

2.6

GUP-DC19

24.0

688 720.34

9 235 261.88

2.6

GUP-DC20

25.0

689 102.70

9 236 181.18

2.4

GUP-DC06A

GUP-DC21

26.0

689 228.64

9 237 155.85

2.2

GUP-DC22A

27.0

688 731.44

9 238 007.08

1.5

51 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

GUP-DC22B

27.0

688 728.28

9 237 996.91

1.9

GUP-DC23

28.0

687 895.40

9 238 555.27

2.5

GUP-DC24

29.0

687 062.22

9 239 103.07

1.4

GUP-DC24A

29.0

687 060.86

9 239 095.14

2.5

GUP-DC25

29.84

686 355.33

9 239 554.57

3.0

GUP-DC26

31.0

685 375.33

9 240 180.96

2.7

GUP-DC27

32.0

684 537.59

9 240 724.51

2.4

GUP-DC28

33.0

683 694.64

9 241 266.25

2.5

GUP-DC29

34.0

682 854.11

9241 810.88

2.3

GUP-DC30

35.0

682 014.42

9 242 348.31

2.3

GUP-DC31

36.0

681 170.48

9 242 889.47

2.2

GUP-DC32A

37.0

680 332.70

9 243 429.75

2.2

GUP-DC33

38.0

679 496.05

9 243 973.03

2.6

GUP-DC34

39.0

678 539.45

9 244 196.72

1.7

GUP-DC34A

39.0

678 537.91

9 244 194.13

1.7

GUP-DC35

40

677 653.24

9 243 781.73

2.0

52 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

6.

CONCLUSIONS a. Along the nearshore area the seabed is relatively flat and lies 0.0 to 0.9 m above LAT. Along the offshore route the maximum depth is 27.3 m at around KP 27. The seabed gradient generally is less than 3°, except along the coral area between KP 6.5 and 9.5. Prior to pipeline burial spanning could be expected around KP7.67, 7.9, 9.0 and 10.9. b. The seabed sediments consist of loose sand, dense sand/ calcarenite, coral and soft clay. The predominant features on the route are the Kodeco 14” gas pipeline, fishing kellongs and linear debris (suspected to be an abandoned pipeline section). Minor seabed features include pockmarks, seabed scars, depressions and debris c. Significant magnetic anomalies occur along the existing 14” pipeline and suspected abandoned pipeline section. One other significant magnetic anomaly occurs around KP 31.25, however the object could not be seen on the sonar records, so is assumed to be buried. d. The superficial sediments consists of loose sand and very soft clay, with the exception of the calcarenite and coral areas. Underlying the superficial sediments are sedimentary sequences consisting of silty sand, sandy clay and well laminated sandy/ silty clay. e. Limited sub-bottom penetration occurs along the route and is interpreted due to the presence of organic material within the strata. f.

Several palaeochannels were observed between KP 13.5 and KP 14.8. Channel width varies from 250 m to 400 m, extending east/ west beyond the limit of the survey. The channel infill is interpreted to consist of silty clay interlayered with silt and sand interbeds. Coarser materials are expected at the base of the channel.

53 P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

APPENDIX A

GEOTECHNICAL REPORT ON DROP CORE SAMPLES

P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

APPENDIX B

PREDICTED TIDAL CURVE

P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

PREDICTED TIDAL CURVE 3.0

2.5

Depth Above LAT (m)

2.0

1.5

1.0

0.5

0.0 1/6/2003 0:00 1/7/2003 0:00 1/8/2003 0:00 1/9/2003 0:00

1/10/2003 0:00

1/11/2003 0:00

1/12/2003 0:00

1/13/2003 0:00

1/14/2003 0:00

1/15/2003 0:00

1/16/2003 0:00

1/17/2003 0:00

1/18/2003 0:00

1/19/2003 0:00

1/20/2003 0:00

1/21/2003 0:00

1/22/2003 0:00

Date (06 Jan 03 - 29 Jan 03), Time in UTC Mean

Karang Jamuang

Ujung Pangkah

Surabaya

1/23/2003 0:00

1/24/2003 0:00

1/25/2003 0:00

1/26/2003 0:00

1/27/2003 0:00

1/28/2003 0:00

1/29/2003 0:00

1/30/2003 0:00

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

APPENDIX C

TEMPERATURE AND VELOCITY OF SOUND OF SEA WATER AGAINST DEPTH PROFILES, BASED ON THE CALIBRATION DURING THE PERIOD OF SURVEY

P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (1048hrs, 09 January 2003) [E 682587m, N 9214352m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 2 4

Temperature

6 8 10

Depth Below Sea Surface (m)

Sound Velocity Profile

12

Min Velocity: 1542.1m/s Max Velocity: 1543.3m/s Average Velocity:1542.8m/s

14

Min Temp : 29.8 deg C Max Temp : 30.1 deg C Average Temp : 30.0 deg C

16 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

Temperature (oC)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0957hrs, 10 January 2003) [E 682320m, N 9216440m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 1

Temperature

2 3

Depth Below Sea Surface (m)

Sound Velocity Profile

Min Velocity: 1542.7m/s Max Velocity: 1543.8m/s Average Velocity:1543.3m/s 4 Min Temp : 28.2 deg C Max Temp : 29.6 deg C Average Temp : 29.3 deg C

5 6 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

Temperature (oC)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (1130hrs, 10 January 2003) [E 685790m, N 9227654m] Sound Velocity (m/sec) 1545

1544.8

1544.6

1544.4

1544.2

1544

1543.8

1543.6

1543.4

1543.2

1543 0 2

Sound Velocity Profile

Temperature

4 6

Depth Below Sea Surface (m)

8 Min Velocity: 1543.7m/s Max Velocity: 1545.0m/s Average Velocity:1544.3m/s 10

Min Temp : 29.9 deg C Max Temp : 30.2 deg C Average Temp : 30.1 deg C

12 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

Temperature (oC)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0917hrs, 11 January 2003) [E 685991m, N 9227300m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 2

Temperature Sound Velocity Profile

4 6

Depth Below Sea Surface (m)

8 Min Velocity: 1542.1m/s Max Velocity: 1543.3m/s Average Velocity:1542.8m/s 10

Min Temp : 29.8 deg C Max Temp : 30.1 deg C Average Temp : 30.0 deg C

12 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

Temperature (oC)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0817hrs, 12 January 2003) [E 682557m, N 9216519m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 2

Sound Velocity Profile

4

Temperature

6 8 Min Temp : 29.7 deg C Max Temp : 29.7 deg C Average Temp : 29.7 deg C 10

Depth Below Sea Surface (m)

Min Velocity: 1542.2m/s Max Velocity: 1543.2m/s Average Velocity:1542.9m/s

12 14 16 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (1336hrs, 13 January 2003) [E 682484m, 9215355N m] Sound Velocity (m/sec) 1546

1545.5

1545

1544.5

1544

1543.5

1543

1542.5

1542 0 2

Temperature

4 6

Min Velocity: 1542.6m/s Max Velocity: 1544.5m/s Average Velocity:1543.7m/s 8 Min Temp : 39.8 deg C Max Temp : 30.5 deg C Average Temp : 30.1 deg C 10

Depth Below Sea Surface (m)

Sound Velocity Profile

12 14 16 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0719hrs, 14 January 2003) [E 682486m, N 9215701m] Sound Velocity (m/sec) 1543.6

1543.8

1544

29.6

29.8

30

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 2

Temperature

Sound Velocity Profile

4 6 8

Depth Below Sea Surface (m)

Min Velocity: 1542.7m/s Max Velocity: 1543.3m/s Average Velocity:1543.1m/s 10

Min Temp : 28.7 deg C Max Temp : 29.7 deg C Average Temp : 29.6 deg C

12 14 29.4

29.2

29

28.8

28.6

28.4

28.2

28

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0722hrs, 15 January 2003) [E 682613m, N 9216092m] Sound Velocity (m/sec) 1544

29.9

30

0

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 2

Temperature Sound Velocity Profile

4 6 8

Depth Below Sea Surface (m)

Min Velocity: 1543.0m/s Max Velocity: 1543.7m/s Average Velocity:1543.3m/s 10

Min Temp : 29.8 deg C Max Temp : 29.9 deg C Average Temp : 29.9 deg C

12 14 29.8

29.7

29.6

29.5

29.4

29.3

29.2

29.1

29

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (1629hrs, 16 January 2003) [E 683752m, N 9213790m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0 2

Temperature

4 Sound Velocity Profile

6 8 10

Depth Below Sea Surface (m)

12

Min Velocity: 1543.1m/s Max Velocity: 1543.7m/s Average Velocity:1543.3m/s

14

Min Temp : 30.0 deg C Max Temp : 30.4 deg C Average Temp : 30.2 deg C

16 32

31.8

31.6

31.4

31.2

31

30.8

30.6

30.4

30.2

30

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0845hrs, 17 January 2003) [E 676928m, N 9242999m] Sound Velocity (m/sec) 1544

1542

1540

1538

1536

1534

1532 0 1 2 3

Temperature

4 5 6

Depth Below Sea Surface (m)

Sound Velocity Profile

7 Min Velocity: 1541.8m/s Max Velocity: 1544.3m/s Average Velocity:1543.5m/s 8 9

Min Temp : 29.7 deg C Max Temp : 30.2 deg C Average Temp : 29.9 deg C

10 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0850hrs, 19 January 2003) [E 690774m, N 9235117m] Sound Velocity (m/sec) 1544

1543.8

1543.6

1543.4

1543.2

1543

1542.8

1542.6

1542.4

1542.2

1542 0

Temperature

2 4 6

Depth Below Sea Surface (m)

Sound Velocity Profile

Min Velocity: 1540.0m/s Max Velocity: 1543.8m/s Average Velocity:1543.2m/s 8 Min Temp : 29.7 deg C Max Temp : 30.0 deg C Average Temp : 29.8 deg C

10 12 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

Temperature (oC)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0849hrs, 20 January 2003) [E 698830m, N 9233565m] Sound Velocity (m/sec) 1545

1544.8

1544.6

1544.4

1544.2

1544

1543.8

1543.6

1543.4

1543.2

1543 0

Temperature

2 4 Sound Velocity Profile

Min Temp : 30.0 deg C Max Temp : 30.6 deg C Average Temp : 30.2 deg C

6

Depth Below Sea Surface (m)

Min Velocity: 1543.6m/s Max Velocity: 1544.3m/s Average Velocity:1544.1m/s

8 10 12 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

o

Temperature ( C)

UJUNG PANGKAH - GRESIK Sound Velocity & Temperature vs Depth Profiles (0915hrs, 21 January 2003) [E 679171m, N 9242554m] Sound Velocity (m/sec) 1545

1544.5

1544

1543.5

1543

1542.5

1542 0 2

Temperature

4 6 8

Depth Below Sea Surface (m)

Sound Velocity Profile

10

Min Velocity: 1542.4m/s Max Velocity: 1544.0m/s Average Velocity:1543.7m/s

12

Min Temp : 29.8 deg C Max Temp : 30.7 deg C Average Temp : 30.1 deg C

14 31

30.8

30.6

30.4

30.2

30

29.8

29.6

29.4

29.2

29

o

Temperature ( C)

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

APPENDIX D

P.T KALVINDO RAYA SEMESTA SERVICE WARRANTY

P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01

Final Report on the Route Survey for the Proposed Gas Pipeline, Ujung Pangkah to Gresik Offshore East Java, Indonesia

P.T. KALVINDO RAYA SEMESTA SERVICE WARRANTY 1.

This report and the geophysical interpretation and assessment carried out in connection with the report (together the “Services”) were compiled and carried out by P.T Kalvindo Raya Semesta (PTKRS) for Amerada Hess (Indonesia-Pangkah) Limited (AHL) in accordance with the terms of a contract between PTKRS and AHL. The Services were performed by PTKRS with the skill and care ordinarily exercised by a reasonable geophysical survey contractor, at the time the Services were performed. Further, and in particular, the Services were performed by PTKRS taking into account the limits of the scope of works required by AHL, the time scale involved and the resources, including financial and manpower resources, agreed between PTKRS and AHL.

2.

Other than that expressly contained in paragraph 1 above, PTKRS provides no other representation or warranty whether express or implied, in relation to the Services.

3.

The Services were performed by PTKRS exclusively for the purposes of AHL. PTKRS is not aware of any interest of or reliance by any party other than AHL in or on the Services. Unless stated in the contract or report for the Services or expressly provided in writing, PTKRS does not authorise, consent or condone any party other than AHL relying upon the services. Should this report or any part of this report, or otherwise details of the Services or any part of the services be made known to any such party and such party relies thereon that party does so wholly at its own and sole risk and PTKRS disclaims any liability to such parties. Any such party would be well advised to seek (independent) advice from a competent (geophysical survey contractor/consultant) and/or lawyer.

4.

It is PTKRS’s understanding that this report is to be used for the purpose described in Section 2 “Introduction” of the report. That purpose was a significant factor in determining the scope and level of the Services. Should the purpose for which the report is used, or AHL proposed development or activity change, this report may no longer be valid and any further use of or reliance upon the report in those circumstances by AHL without PTKRS’s review and advice shall be at AHL sole and own risk. Should PTKRS be requested to review the report after the date hereof, PTKRS shall be entitled to additional payment at the then existing rates or such other terms as agreed between PTKRS and AHL.

5.

The passage of time may result in man-made and/or natural changes in site conditions and changes in regulatory or other legal provisions, technology or economic conditions which could render the report inaccurate or unreliable. The information and conclusions contained in this report should not be relied upon if any such changes have taken place and in any event after a period not greater than two years (or typically six months in the case of seabed features information) from the date of this report or as stated in the report without the written advice of PTKRS. In the absence of such written advice from PTKRS, reliance on the report after the specified time period shall be at AHL own and sole risk. Should PTKRS be asked to review the report after the specified time period, PTKRS shall be entitled to additional payment at the then existing rate or such other terms as may be agreed upon between PTKRS and AHL.

6.

The observations and conclusions described in this report are based solely upon the Services which were provided pursuant to the agreement between AHL and PTKRS. PTKRS has not performed any observations, investigations, studies or testing not specifically set out or required by the contract between AHL and PTKRS. PTKRS is not liable for the existence of any condition, the discovery of which would require performance of services not otherwise contained in the Services.

7.

Where the Services have involved the use of any information provided by third parties or AHL and upon which PTKRS was reasonably entitled to rely then the Services clearly are limited by the accuracy of such information. Unless otherwise stated, PTKRS was not authorised and did not attempt to independently verify the accuracy or completeness of information, documentation or materials received from AHL or third parties, including laboratories and information services, during the performance of the services. PTKRS is not liable for any inaccurate information or conclusions, the discovery of which inaccuracies required the doing of any act including the gathering of any information which was not reasonably available to PTKRS and including the doing of any independent investigation of the information provided to PTKRS save as otherwise provided in the terms of the contract between AHL and PTKRS.

P.T. Kalvindo Raya Semesta File Name : Final Report S1198-01-Route survey - Amerada Hess.doc

Report No. S1198-01