4129 Method Statement 48 for Sand Compaction, HDPE Sheet & Armour Rock ( Sea Side ) Placing - Rev.1

TRANSMITTAL

(1) Contract No. (2) Project Name (3) Contractor (4) To (5) COPYto (6) Subject

: CPEPIICBIO1 : Colombo Port Expansion Project : Hyundai Engineering & Construction Co., Ltd.

: CRE, Scott Wilson : Project Director, Sri Lanka Ports Authority : Method Statement 48 for Sand Compaction, HDPE Sheet and

Amour Rock (Sea Side) Placing - Rev.1 (7) Conb.actors File No. : HDEC/CPEP/11/4129 The following islare submitted : Description (8)

Document Date (9)

1. Method Statement 48 for Sand Compaction, HDPE Sheet and Amour Rock (Sea Side) Placing- Rev. 1

08'~March 201 1

Transmittal No. (10)

No. Copies (1 1)

One (1) Copy

(12) Remarks : Further to our transmittal ref. No. HDEC/CPEP/1114078 dated 23rd February 2011. we hereby submit the revised "Method Statement for Sand Compaction,

(13) Signed (15) Name

(14) Date : OsthMarch 201 1 (16) Title : Proiect Director

: Hvung Kim

" Having checked this submission, I certifi that it confirms to the requirements o f the Contract in all respects, expect as otherwise indicated." Employer's Representative's Comments/Response:

Attach additional sheets as necessary. Signed : Name :

Date : Title :

* Note : M

Management

FI

For information and by the Employer's Representative

D

Design

UR

Upon Request

C

Construction

CR

For Contract Records

E

Environmental

FS

For Approval

S

Survey

FC

For consent by the Engineer's Representative

Method Statement Register [Colombo Port Expansion Project I S r i Lanka] Submission IRevision No.

Method No.

Method Description

Method Statementsfor CoreLoc Crack Repairing Using Epoxy

1

0

Ref. No.

Date

HDECICPEPH012265

9.Jan.10

I

Ref. No.

Date

I

2 Ref. No.

Date

I

3 Ref. No.

Remarks Date

HDECICPEPH012451 10.Feb.10 No Response

Method Statements for Backfillingof Submarine Pipeline Trench

t

HDECICPEP/l0/2280

12.Jan.10 No Response HDECICPEPH012657

Method Statements for Submarine Pipeline Trench Badmlling for Hydro Test Method Statements for Demolitionof Chain Link Fence

Method Statements for Demolitionof Existing SAGT Boundary Wall

59

60

1 1 61

62

63

I

65

66

COLPOIMS1038

Method Statements for Core-Loc Crack Repair Using Epoxy Filling

COLPO(MS1039

y ~lmk Method Statements for Secondary ~ e a b a t e~r u a Wall Fabrication

COLPOiMSRlO

I

~e.~d statements for Secondary ~ ~ ~ k ~ w o c placing a k t ~(up ~ to Ch.5m,

+-

HDECICPEPHOI3129 16.Jun.10 HIWi85107101147

10.Aug.10

HDECICPEPHOI3178 23.Jun.10

HDECICPEPH013386

7.Aug.10

HDECICPEPH114022

7.Feb.11

HIWI80101H136 HDECICPEPHOI3178

I

I

I

~ ~ t hstatements ~ , j for ~ ~ ~ i l of^^^^ i t & ~ ~~~d ~ to secondary BreakwaterConstructionSite

HDECICPEPHOl3405 11.Aug.10

C0LP01MS1043

~ ~ t statements h ~ d fw ~~~~~~l o f ~ ~~ ~~, jt (~ r ~i1 a~ 21 ~ l within ~ Appmach Channel

fHDEClCPEPHOi3437 19.Aug.10

Method Statements for Secondary Breakwater Quay Wall Block Repair

HDEC1CPEPH013438

COLPOIMS1044

HIWi80101101186

HIW152iU1151

HIWI81102/01209

lgAug.10 2.Sep.10

HDECICPEPHOI3609

9.0ct.10

HIWI80102101252

10.Dec.10

Method Statements for Quarry Run Filling under Wave Wall

-+ I

Wolk Finished

4

Conditionally Approved

Rivision Requested HDECICPEPHOI3439 19.Aug.10 Conditionally Approved

12.Aug.10

HIW180101101181

Wolk Finished

I

I

10.Sep.10

6.0ct.10

1

Conditionally Approved

10.Ju1.10

Method Statements for Secondary Breakwater Quay Wall Blod; Foundation

No Response

Conditionally Approved

3.Aug.10

28.Ju1.10

1

1

No Resoonse

HDECICPEPH012822 10Apr.10

5.Aug.10

COLPOIMSB45

2O.Mar.10

I

HDECICPEPH012750 27.Mar.10

HIWi80101H140

C0LP01MS1042

1 HDECICPEPHOR711

HDECICPEPHOR731 24.Mar.10

HDEC1CPEPfi013345

COLPOIMS,D41

13.Mar.10

Approved

HDECICPEPHOI3641 19.0ct.10

I

HIWi81102/01251

Add. Inform Required

10.Dec.10

Conditionally Approved

I Approved

Method Statements for Secondary Breakwater Construction(from

Method Statement Register.xls

-414-

201 1-03-08

AHYUNDAI

IWWER~)~~~TRC~MCOLTII

Method Statement for Document No. : COLPOIMS1048 Rev.1 Date : 2011.03.08 Sand Compaction, HDPE Sheet and Armour Rock Page : 1 of 31 (Sea Side) Placing

Method Statements for

Sand Compaction, HDPE Sheet And Armour Rock (Sea Side) Placing Colombo Port Expansion Project Habour Infrastructure Works, Sri Lanka

Docu. No. Rev. No. Prepared Date. Effective Date. Department.

:

Planning I Construction Division.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 2 of 31

Revision Control Table. Rev. Date

Rev. No.

2011.02.23.

0

First Issue.

1

2.3.2 Grid of Vibro Compaction (page 9) – Grid pattern changed from isosceles triangle to equilateral triangle

2011.03.08

Description of Revision.

2.4.8 (page 16) Field Welding Test changed into Field Welding Inspection 5.1 ITP (page 23,24) No. 2 & 4 Revised 5.1 ITP (page 25) No.9 Air pressure test changed into Field welding inspection

Remarks

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 3 of 31

CONTENTS 1

Introduction .................................................................................................................... 4 1.1

2

Work Method ................................................................................................................. 5 2.1

Work Sequence .......................................................................................................................................... 5

2.2

Sand Compaction Sequence .................................................................................................................... 6

2.3

Sand Compaction Method ......................................................................................................................... 8

2.4

2.5

3 4

2.3.1

Deep Vibro Compaction .............................................................................................................. 8

2.3.2

Grid of Vibro Compaction ............................................................................................................ 9

2.3.3

Pattern of Probe Insertion and Pull-out ................................................................................... 10

2.3.4

Records........................................................................................................................................ 11

HDPE Sheet Placing ................................................................................................................................ 11 2.4.1

Preparation of Sand Slope and Geo-textile ............................................................................ 11

2.4.2

Roll Reception and Storage of HDPE Sheet .......................................................................... 12

2.4.3

Preparation of HDPE Sheet before Placing ........................................................................... 12

2.4.4

Deployment of HDPE Sheet Placing ....................................................................................... 13

2.4.5

Trial Welding ............................................................................................................................... 13

2.4.6

Field Welding – Fusion (Hot Wedge) Welding System ......................................................... 13

2.4.7

Field Welding – Extrusion Welding System ............................................................................ 15

2.4.8

Field Welding Inspection ........................................................................................................... 16

Bedding Layer, Rock (0.3~1.0 ton) and Armour Rock (3.5~6.5 ton) Placing ................................... 17 2.5.1

Material Requirement ................................................................................................................ 17

2.5.2

Bedding Layer and Rock (0.3~1.0 ton) Placing ..................................................................... 18

2.5.3

Armour Rock (3.5~6.5 ton) Placing ......................................................................................... 18

Quality Control ............................................................................................................. 19 Safety .......................................................................................................................... 20 4.1

5

Purpose ........................................................................................................................................................ 4

General Safety .......................................................................................................................................... 20 4.2.1

Heavy Equipments. .................................................................................................................... 20

4.2.2

Vibrators / Generators / Water Pumps / Power Tools ........................................................... 20

Inspection & Test Plan ................................................................................................. 22 5.1

Inspection & Test Plan ............................................................................................................................. 23

Attachment Attachment

#. 1 ............................................................................................................... 27 #. 2 ............................................................................................................... 29

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

1

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 4 of 31

Introduction 1.1 Purpose This document outlines the work methods for sand compaction for road construction up to main breakwater Ch.4,200 and, HDPE sheet & armour rock (sea side) placing.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

2

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 5 of 31

Work Method 2.1 Work Sequence Below is a flow chart of normal work procedure for sand compaction, HDPE sheet and armour rock placing.

Start of Work

Sand Compaction (Vibro-Hammer) Compaction Test Preparation of Sand Slope

HDPE Sheet Placing

Bedding Layer Placing

Rock (0.35~1.0 ton) Placing

Rock (3.5~6.5 ton) Placing

Process Finish

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 6 of 31

2.2 Sand Compaction Sequence The compaction is required within the road boundary of breakwater up to Ch.4,216 which is consist of wide road and narrow road as shown in Fig.2-1. The wide road section is up to Ch.2,000 and the narrow road section is from Ch.2,000 to Ch.4,216.

[ Fig. 2-1 ] Plan of Breakwater and Compaction Sequence The subgrade and fill material beneath the pavement should be compacted up to required degree of compaction to support traffic load on the pavement and prevent additional long term settlement. The hatched compaction areas in Fig. 2-2 and Fig. 23 sufficiently cover the traffic load distribution area beneath the load area. The compaction will be carried out in the order described in Fig. 2-1 ① Ch.800 ~ Ch.1,500 ② Ch.1,500 ~ Ch.1,900 ③ CWA ~ Ch.800 ④ Ch.1,900 ~ Ch.3,100 ⑤ Ch.3,100 ~ Ch.4,216

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 7 of 31

[ Fig. 2-2 ] Sectional View of Compaction Area for Wide Road (~Ch.2,000)

[ Fig. 2-3 ] Sectional View of Compaction Area for Narrow Road (Ch.2,000~Ch.4,216) For Area 1 (Sequence ① and ②), the area is filled with sand up to around +4.5 m ~ +5.0 m level and used for the access road. As for each 100 meters from Ch.1,500 toward Ch.800, one half (sea side) of full width will compacted and the other half (land side) will be used for access road. After sea side half is compacted, it will be used for access road and land side will be compacted contrarily. It will be repeated by turns for each 100 meter. For Area 2 (CWA~Ch.800, Sequence ③), the area is filled up to +3.0 m and the CoreLoc units are stored at both sides of access road. The stored units will be removed from existing location for placing before the compaction of area 1 is finished.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 8 of 31

Then sand which was pumped and stored within CWA will be transported by dump truck and the sand embankment will be prepared for compaction up to the level below the final road surface by 0.2 m for one half of the full width. After the compaction for one half up to Ch.800 is finished, the other half will be filled with sand up to the level below the final road surface by 0.2 m and compacted. For Area 3 and 4 (Sequence ④ and ⑤), there are rock stockpiles along the road line. When the stored rock is removed, the sand will be filled up to the required level by pumping of dredgers. When the sand embankment is prepared, it will be compacted.

2.3 Sand Compaction Method Deep compaction by vibrating H-beam will be carried out at the formation level after hydraulic filling. There are several factors affecting efficiency of vibro-compaction such as capacity of vibro-hammer, frequency of vibration, shape of vibrating probe, time period of vibration, number of penetration and extraction, spacing of compaction point and so forth. In order to determine the factors, the trial compaction was carried and proposal for compaction method and alternative acceptance criteria of sand compaction was submitted with transmittal No. HDEC/CPEP/11/4103. Top 45 cm surface layer will be compacted by vibrating roller at formation level. The requirement of insitu density for this layer will be discussed further with the Engineer. The capacity of roller and number of trips also will be decided through trial compaction and discussion with the Engineer. CPT (Cone Penetration Test) will be used to check the degree of compaction for deep sand compaction area. The correlation between the cone tip resistance (qc) of CPT and relative density was developed through trial compaction and proposed as a alternative acceptance criteria of sand compaction. 2.3.1 Deep Vibro Compaction The deep vibro compaction work will be carried out using land based equipment as follows and in the photograph below; 9

Vibro-hammer : weight 11 ton, electric power capacity 340 kW

9

Crawler Crane : 70 ton

9

Generator : 200 kVA

9

Water Pump : 3”

9

H-Beam : 55 X 64 X 13, 6 m

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 9 of 31

Vibro-Hammer

Generator Crane H-Beam

Water Supply

2.3.2 Grid of Vibro Compaction At the beginning, the compaction work will be carried out with 2.5m spacing in equilateral triangular patterns as below.

[ Fig. 2-4 ] Grid of Vibro Compaction

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 10 of 31

To form a vibro compaction point, the H-beam gripped with vibro-hammer will be placed over the selected position by means of a crawler crane. After starting the motor of the vibro-hammer, water will be discharged from 4 pipes which are installed on each side of the H-beam and the beam will be slowly lowered. In the immediate vicinity of the beam head, the sand will be saturated with water inducing local and temporary liquefaction of the soil under the influence of the vibration. 2.3.3 Pattern of Probe Insertion and Pull-out When the desired depth of penetration is reached, the downward movement of the beam will be stopped and upward movement started. When the embedded length of beam reaches 1 m, downward movement of beam will resume and pulled out after beam touches the desired depth. The patter of probe insertion and pull-out is given in the sketch below.

[ Fig. 2-5 ] Pattern of Probe Insertion and Pull-out The compaction duration at each compaction point will be min. 4 minutes and the water will be jetted continuously during compaction. Generally the effect of the compaction becomes visible at the ground surface in the form of a cone shaped depression. The depression formed around the compaction point will be leveled by trimming and grading up to the level slightly higher than the sand formation (+4.5m) and compacted with vibro-roller.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 11 of 31

For the proper compaction of both slope areas, there will be additional filling by 0.5m width and it will be trimmed to the design profile by back-hoe after vibro compaction is finished. 2.3.4 Records Daily report and daily compaction record will be kept and submitted to the Engineer for information and review. Daily compaction record form is attached as attachment #.1

2.4 HDPE Sheet Placing 2.4.1 Preparation of Sand Slope and Geo-textile The surface will be prepared with back-hoe, prior to the HDPE sheet installation, according to the executive design guidelines. The surface shall be smooth and free of sharp objects and stones, free of all foreign and organic material and debris of any kind.

[ Fig. 2-6 ] Preparation of Sand Slope

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 12 of 31

The geotextile shall be unfolded and spread over the slope. spread on the slope shall be more than one (1) meter.

The length of geotexte

One recommends that the HDPE sheet be installed immediately after slope preparation to avoid deterioration caused by rain, wind, lost of moisture or local traffic. 2.4.2 Roll Reception and Storage of HDPE Sheet The rolls unloading shall be done with equipment that ensures its security transportation. When the rolls delivered and unloaded at the site, they will be inspected visually. The external roll side shall be free of holes, tears and bubbles. The technical data of HDPE sheet (Geomembrane) is attached as Attachment #.2 The rolls shall be stored on the smooth ground without excessively hot or moist condition. Sharp objects or anything which may puncture the sheet shall be removed. Under standard weather condition, the storage of HDPE sheet does not require special treatment. 2.4.3 Preparation of HDPE Sheet before Placing The required length of each chainage of breakwater is summarized as below; Chainage

Kerb

Kerb

Level

Height

HDPE

HDPE

upper

lower

level

level

HDPE Height

HDEP

HDPE

Slope

upper

Length

Length

HDPE Length

Ch.0 ~ Ch. 1,100

5.00

0.575

4.425

1.5

2.925

5.896

0.7

6.596

Ch. 1,100 ~ Ch. 1,780

5.00

0.575

4.425

1.5

2.925

5.896

0.7

6.596

Ch. 1,780 ~ Ch. 2,570

5.83

0.575

5.255

1.0

4.255

8.576

0.7

9.276

Ch. 2,570 ~ Ch. 4,250

5.50

0.575

4.925

2.0

2.925

5.896

0.7

6.596

Remarks

The width of HDPE sheet delivered to the site is 6 meter. Therefore, before placing the sheet on the slope, additional length shall be welded at the storage yard or on the embankment near the slope. The HDPE sheet will be delivered with 7 meter length in the future to minimize welding joint.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 13 of 31

2.4.4 Deployment of HDPE Sheet Placing Initially, the HDPE sheet will be placed at 30m interval, longitudinally and the interval may be adjusted later. All machines or equipment to be used for HDPE sheet placing shall be in appropriate manner to prevent the sheet from any damage, extension or wrinkles. Adequate temporary anchoring (sand bags or tires), that cause no damage to the HDPE sheet, may be placed to prevent uplift by the wind. Welding should be performed as soon as possible after the sheet is placed. 2.4.5 Trial Welding Trial welding will be done to verify the equipment and the operator. This verification shall be made prior to the main field welding. Trial welding will be done under the same conditions as actual welding. The trial welding will be carried out under the supervision of manufacture. The welding overlap shall be over 10 cm for hot wedge welding and over 7.5 cm for extrusion welding. In cases of “fish mouths” or wrinkles at the seam overlaps, they shall be cut along the ridge of the wrinkle, in order to achieve a flat overlap. The HDPE sheet portion cut shall be welded and any portion where overlap is inadequate shall be patched with an oval or round patch of the same HDPE sheet, extending a minimum of 15cm beyond the cut in all directions. 2.4.6 Field Welding – Fusion (Hot Wedge) Welding System There are several different types of field welding equipment available. The fusion (hot wedge) and the extrusion welding methods are used for HDPE sheet welding. Hot wedge welding is the primary method for panel seam and extrusion for HDPE insert liners and repairs. Fusion (Hot Wedge) welding is the primary welding method. Hot metal wedge shall be heated to the required temperature and used to melt the overlapped facing surfaces then they are pressed together with two nip/drive rollers to create a permanent bonding structure. Welding temperature setting is recommended at 325~400℃, upon the thickness of HDPE sheet. Weather condition (e.g. temperature, sunshine, and wind) shall be taken into consideration as well.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 14 of 31

Turn off the motor before placing the overlap in the wedge and roller. After the overlap to be welded is properly positioned, turn on the motor and lock the seam in position. The welding machine shall be aligned and set to the adequate temperature, the travel speed of welding machine is set depending on the thickness of sheet and weather condition.

[ Fig. 2-7 ] Typical double fusion hot wedge weld detail The welding operator shall take care of welding machine for temperature and speed control to maintain a consistent weld. A small amount of squeeze-out is a good indication that the proper welding temperature has been set. The melted material will lately be extruded out of the welding area. If there appears an excessive amount of hot extrusion, it indicates that the temperature or pressure is too high and needs adjustment. For the 1mm or less thickness sheet, if there shows a long, low, sinusoidal wavelength pattern in the direction of the welding, it indicates the proper seaming. If the wave peaks are too close, the seaming speed shall be increased until an acceptable pattern appears. The absence of the wave length indicates that the seaming speed shall be decreased. There will be no wave pattern for the thickness greater than 1mm because of the inherent stiffness. Nip/Drive roller marks will always show on the welding track surface, they are noticeable and slightly embossed.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 15 of 31

Daily checking and cleaning of welder are required. 2.4.7 Field Welding – Extrusion Welding System Extrusion welding is primarily used for repairs, details (e.g. piping or trench) and T welding. The welding rods, with 4mm or 5mm diameter, which are made of the same material as the HDPE sheet, are extruded by the extrusion welder and pasted along the overlapped seam. Preheating of the sheet in the welding area is performed by the extrusion welder.

[ Fig. 2-7 ] Typical Extrusion weld detail The welding area shall be dry and clean. The HDPE sheet surface shall be slightly ground to remove the oxidized layer or other foreign materials. Grinding depth shall not exceed 10% of sheet thickness. Grinding width shall match extruder, and not exceed either side of the extruded. Welding shall be conducted right after grinding, no more than 30 minutes. Use hot air welder or other equipment to tack two sheets binding together. heat could damage the upper sheet and shall be avoided.

Excess

The extrusion welder shall purge all degraded material in the barrel for approximately 30 seconds before welding. The purge material shall not be discharged on the surface of the sheet.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 16 of 31

The overlap thickness shall be approximately twice of the sheet thickness, measuring from the upper surface of the bottom sheet to the top of the extrusion. A small amount of squeeze-out appearing on two sides of welding track is allowed. If the amount of squeeze-out is too much, lower the extrusion welder temperature setting or increase the welding speed. If interruption is necessary during the welding process, trial-off the extrusion shall be applied gradually instead of stopping instantly. To re-launch the welding process, the continued area shall be ground before welding. To perform repairs, piping, other accessories, T welding and Y welding, follow the above procedures. The welding shall be done vertically up and down the slope. The overlaps between panels shall be over 10 cm for fusion welding and over 7.5 cm for extrusion welding. Before welding start the overlaps shall be dry and clear. 2.4.8 Field Welding Inspection All field welding shall be inspected by the engineer visually. The clear nip/drive roller marks certify the quality of welding and the Engineer can check the roller marks run out of the overlap edge.

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 17 of 31

2.5 Bedding Layer, Rock (0.3~1.0 ton) and Armour Rock (3.5~6.5 ton) Placing After HDPE sheet is placed and tested, remaining rock such as bedding layer, rock (0.3~1.0 ton) and armour rock (3.5~6.5 ton) will placed as per the drawing and specification.

[ Fig. 2-9 ] Rock Placing Sequence 2.5.1 Material Requirement Quarried rock to be used in armour, underlayers shall be free from any defects which could lead to breakage during loading, unloading or placing. All Quarry stones shall be prismoidal in shape. Within each class, no stones shall have a length to thickness (l/d) ratio greater than 3 and not more than 50% of stones shall have a l/d ration greater than 2, where the length (l) is defined as the greatest distance between two points in the stone and the thickness (d) as the minimum distance between two parallel straight lines between which the stone can just pass. Quarried rock to be used in armour, underlayers shall be subject to the following limits; y Apparent Relative Density (BS812 : Part 2) > 2,650 kg/m3

Method Statement for Sand Compaction, HDPE Sheet and Armour Rock (Sea Side) Placing

Document No. : COLPO/MS/048 Rev.1 Date : 2011. 03. 08 Page : 18 of 31

y

Water Absorption (BS812 : Part 2)

y

Soundness (BS812 : Part 121) MgSO4

y

Either : Aggregate Abrasion (BS 812 : Part 113) < 15 %

y

Or : Los Angeles Abrasion (ASTM C-535)

2650 Kg/m3 Water absorption5 Mpa LAAV