project profile for yau tong bay – decommissioning of

Yau Tong Bay – Decommissioning of Shipyard Sites Project Profile Main Wealth Development Ltd.

i

Project Profile for

Yau Tong Bay – Decommissioning of Shipyard Sites

Contents

1 BASIC INFORMATION ........................................................................................................... 1

1.1 Project Title ................................................................................................................. 1

1.2 Purpose and Nature of the Project ............................................................................. 1

1.3 Name of Project Proponent ........................................................................................ 1

1.4 Location and Scale of Project and History of Site ...................................................... 1

1.5 Number and Types of Designated Projects to be covered by the Project Profile ...... 1

1.6 Name and Telephone Number of Contact Person ..................................................... 2

2 OUTLINE OF PLANNING AND IMPLEMENATION PROGRAMME ..................................... 2

2.1 Project Implementation Time Table ............................................................................ 2

2.2 Interactions with Other Projects ................................................................................. 2

3 USE OF PREVIOUSLY APPROVED EIA REPORTS ............................................................ 2

4 MAJOR ELEMENTS OF THE SURROUNDING ENVIRONMENT......................................... 3

5 POSSIBLE IMPACT ON THE ENVIRONMENT ..................................................................... 3

6 ENVIRONMENTAL PROTECTION MEASURES TO BE INCORPORATED IN THE DESIGN AND ANY FURTHER ENVIRONMENTAL IMPLICATIONS ................................... 4

6.1 Environmental Implications of Unconcealed Contaminated Sediment ...................... 4

6.2 Proposed Mitigation Measures ................................................................................. 11

7 CONCLUSION ...................................................................................................................... 13

7.1 Overall Conclusion ................................................................................................... 13

LIST OF TABLES Table 1 Summary of Sediment Quality Data Collected in YTB and KTAC / KTTS LIST OF FIGURES Figure 1 Site Location Plan Figure 2 Previous Sediment Sampling Locations at YTB LIST OF APPENDICES Appendix A Recent Sediment Sampling and Testing in YTB in 2009 Appendix B Summary Statistics of the Levels of Toxic Substances in Marine Water, Sediments

and Biota Appendix C Baseline Odour Survey at Yau Tong Bay


1

1 BASIC INFORMATION 1.1 Project Title 1.1.1 Yau Tong Bay – Decommissioning of Shipyard Sites 1.2 Purpose and Nature of the Project 1.2.1 The Project is situated along the shore of Yau Tong Bay (YTB) in East Kowloon within the

Kwun Tong District and the Project Area is zoned as a Comprehensive Development area (“CDA”) on the Draft Cha Kwo Ling, Yau Tong, Lei Yue Mun Outline Zoning Plan (OZP) No. S/K15/18.

1.2.2 The Project area comprises of a number of marine lots, with a total area of over 1 hectare (ha), that are currently or are suspected been used as shipyards. The Project is to decommission these past and existing shipyard lots in the area.

1.3 Name of Project Proponent 1.3.1 Main Wealth Development Ltd. 1.4 Location and Scale of Project and History of Site 1.4.1 The Project Site is located along the shore of YTB (which is also known as Kwun Tong Tsai

Wan) in East Kowloon within the Kwun Tong District. It faces Victoria Harbour to the southwest and is bounded by the Eastern Harbour Crossing Ventilation Building to the west, Cha Kwo Ling Road to the north and east, and Ko Fai Road to the south. The Site is also adjacent to the former Yau Tong Industrial Area, which is at present mainly occupied by obsolete industrial buildings.

1.4.2 There are a total of 47 Marine Lots along the shore of YTB, of which 39 of those are under the control of the Project Proponent and covered in this Project Profile. For the purpose of this Project Profile, these 39 lots (or the ‘concerned lots’) as listed below and highlighted in Figure 1 are hereinafter referred to as the ‘Project Site’. The land uses for the Project Site had been industrial and various land uses including shipyards, timber yards, sawmills and concrete batching plant.

� YTML No. 1

� YTMLs No. 5-14

� YTML No. 15

� YTMLs No. 19-24

� YTMLs No. 27-38

� YTMLs No. 41-46

� YTML No. 54

1.4.3 The Project Site is located within the CDA on the Draft OZP No. S/K15/18. It should be

noted that there are a number of marine lots along the shore of YTB that are not under the control of the Project Proponent. These marine lots are thus not covered under this Project Profile and are excluded in the above list.

1.5 Number and Types of Designated Projects to be covered by the Project Profile 1.5.1 The Project falls under Schedule 2, Part II - Item 17 (decommissioning projects with facility

for ship building or repairing more than 1 ha in size or with a lifting capacity in excess of


2

20,000 tonnes), of the Environmental Impact Assessment Ordinance (EIAO).

1.6 Name and Telephone Number of Contact Person 1.6.1 All enquiries regarding the project can be addressed to:

Ms. Cheng Che Weng Assistant to Manager

Main Wealth Development Limited

Tel. No.: 2908 8307

Fax No.: 2530 1402

Ms. Ng Hoi Ling Assistant to Manager

Main Wealth Development Limited

Tel. No.: 2908 8720

Fax No.: 2530 1402

2 OUTLINE OF PLANNING AND IMPLEMENATION PROGRAMME 2.1 Project Implementation Time Table 2.1.1 The Project Proponent will engage consultants to undertake design and supervision of the

decommissioning works for the Project. Actual decommissioning works will be carried out by contractor(s).

2.1.2 The tentative implementation programme is as follows:

Detailed Design and Tendering ..................................................................... early to mid 2011

Decommissioning .......................................................................................... mid 2011 to 2012

2.2 Interactions with Other Projects 2.2.1 It is not anticipated that the Project would have any major interaction with other projects in

the surrounding area during its implementation period. 3 USE OF PREVIOUSLY APPROVED EIA REPORTS 3.1.1 The following approved EIA Report has been referred to in this Project Profile:

• EIA for Yau Tong Bay Development – Reclamation of Yau Tong Bay (EIAO Register No. AEIAR-053/2002 approved with conditions on 8 April 2002), hereinafter referred to as YTB-EIA.

3.1.2 The YTB-EIA addressed two Schedule 2 Designated Projects namely reclamation of more

than 5 ha in size and decommissioning of ship building and repairing facilities more than 1 ha in size. The purpose of the YTB-EIA is to assess the environmental issues arising from the construction and operation phases of the Reclamation of Yau Tong Bay and to propose


3

mitigation measures for all identified adverse environmental impacts. The scope of works covers in the YTB-EIA includes both marine-based (e.g. reclamation of Yau Tong Bay and construction of seawall) and land-based (e.g. decommissioning and demolishing of existing building structures including shipyards) works.

3.1.3 The environmental aspects assessed in the YTB-EIA includes noise, water quality, waste

management and mud contamination, biogas risk, land contamination as well as landscape and visual impacts. The YTB-EIA had adequately addressed the environmental impacts associated with this Project and the findings of the YTB-EIA indicated that there would be no insurmountable environmental impact arising from the works in YTB, provided that the recommended mitigation measures for the adverse impacts during the different reclamation phases are implemented. Environmental monitoring and audit (EM&A) are required to verify the efficacy of the proposed mitigation measures and to ensure that the adverse impacts are minimised and the relevant standards are complied with at all times.

3.1.4 Subsequent to the YTB-EIA, there are no major changes to the existing / planned land uses assumed in the YTB-EIA in the surrounding area of the Project. As such, the findings of the YTB-EIA are considered to remain valid. For this Project, although there would be no reclamation works, the activities associated with the decommissioning of shipyard sites would be the same as those covered in the YTB-EIA and thus the findings of the YTB-EIA that associated with shipyard decommissioning are considered to be applicable for this Project.

4 MAJOR ELEMENTS OF THE SURROUNDING ENVIRONMENT 4.1.1 Existing developments in the surrounding areas mainly comprise high rise public and private

residential buildings, vacant industrial buildings and warehouses. Specifically, the land uses surrounding the Project Site include the following:

� Residential buildings (largely public housing estates), e.g. Yau Tong Estate, Yau

Mei Court, Yau Lai Estate and Yau Tong Centre to the east / southeast across Cha Kwo Ling Road / the MTR Yau Tong Station;

� Educational institutions, including Kei Faat Primary School, Kei Hin Primary School, St. Antonius Primary School, Fukien Secondary School Affiliated School and Po Chiu Catholic Secondary School, to the east / northeast;

� Yau Tong Industrial Area to the immediate south, which consists of mainly warehouses and godown buildings;

5 POSSIBLE IMPACT ON THE ENVIRONMENT 5.1.1 Based on the YTB-EIA, the possible environmental impacts during the construction and

operation phase include noise, water quality, waste management and mud contamination, biogas risk, land contamination as well as landscape and visual impacts. Given that there are no reclamation works for this Project, the scale of works is expected to be substantially less than those assumed in the YTB-EIA. The associated environmental impacts under this decommissioning works are therefore not expected to be any greater than those predicted in the YTB-EIA. As discussed in Section 3 above, findings from the YTB-EIA indicated that there would be no insurmountable environmental impact arising from the works in YTB, provided that the recommended mitigation measures for the adverse impacts are implemented. EM&A are required to verify the efficacy of the proposed mitigation measures and to ensure that the adverse impacts are minimized and the relevant standards are complied with at all times. Following this findings, it is anticipated that there would be no insurmountable environmental impacts for this Project during the construction and operation phase if the relevant mitigation measures and EM&A as recommended in the YTB-EIA were implemented.


4

6 ENVIRONMENTAL PROTECTION MEASURES TO BE INCORPORATED IN THE

DESIGN AND ANY FURTHER ENVIRONMENTAL IMPLICATIONS 6.1 Environmental Implications of Unconcealed Contaminated Sediment 6.1.1 Although no insurmountable environmental impacts is anticipated for this Project if the

relevant mitigation measures and EM&A programme as recommended in the YTB-EIA were implemented, findings from the YTB-EIA did reveal that the seabed of the existing YTB is highly contaminated by the discharge or contaminants released from the industrial operations of the surrounding marine lots, such as shipyards, sawmill or car repairing industry, and may impose potential hazard to the future YTB CDA as well as marine habitat. According to Section 2.4 of the YTB-EIA, the presence of contaminated sediment without remedial measures or reclamation would have the following specific concerns:

(i) Potential hazards to the public and marine habitat;

(ii) Odour nuisance to nearby residents; and

(iii) Release of seabed contaminants during berthing of marine vessel.

6.1.2 In order to minimise the adverse impacts of the contaminated seabed to the public and marine habitat, it was recommended in the YTB-EIA to retain the contaminated marine deposit at its original position as far as possible and isolate it from the marine environment by concealing the contaminated sediment through reclamation.

6.1.3 However, the current YTB CDA Development Scheme has been revised based on no

reclamation approach and reclamation to conceal the contaminated marine sediment is no longer feasible. According to the YTB-EIA, potential hazards as discussed above could be of concern.

6.1.4 A demolition approach for the marine structure of the shipyard sites similar to the one

adopted for the decommissioning of the disused fuel dolphin under the “Decommissioning of the Former Kai Tak Airport Other than the North Apron” project would be applied. In accordance with the preliminary engineering design, the demolition of marine structure of shipyard in Yau Tong Bay would be demolished down to 1m below existing seabed. The sediment around the piles of the marine structure would be pushed aside to facilitate the pile cutting and no dredging would be required for the demolition works. This approach will eliminate the need for any major dredging, filling, and sediment disposal activities. As no dredging would be required for the proposed demolition works of the marine structure, any loss of fine sediment to suspension from disturbance of the seabed around the piles of the marine structure is expected to be minor and would be gradually resettled in the vicinity of the work site. Therefore, no adverse environmental impacts associated with the decommissioning works would be expected.

6.1.5 The concerns associated with unconcealed contaminated sediment in the YTB-EIA as listed

in Section 6.1.1 above are discussed below.

Review of Hazards associated with Unconcealed Contaminated Sediment

Sediment Contamination at YTB 6.1.6 Sediment sampling and testing has been undertaken in January 1998 under YTB-EIA. The

sampling and testing was carried out in accordance with the requirements set out in EPD Technical Circular (TC) No. 1-1-92, Classification of Dredged Sediments for Marine Disposal. Due to the introduction of new management and classification system at the time, the sediment has also been assessed against the WBTC No. 3/2000, Management of Dredged/Excavated Sediment. A total of 9 sampling locations were carried out within YTB area. The sampling locations within the Project Area are shown in Figure 2 and the sediment quality data are summarized in Table 1. As shown in Table 1, Class C (Category H) material was found at all locations.


5

6.1.7 Further to the site investigation under the YTB-EIA, additional sediment sampling and

testing had been undertaken recently in 2009 to gather additional information on sediment quality at YTB. A total of 10 grab samples were collected and the sampling locations are shown in Figure 2. The sampling and testing works as well as the subsequent assessment generally follow the requirements stipulated under the ETWB TCW No. 34/2002 - Management of Dredged / Excavated Sediment. Details of the sampling and testing works are shown in Appendix A.

6.1.8 Tier II chemical screening was conducted on the collected samples by the HOKLAS

accredited laboratory - ALS Technichem (HK) Pty Ltd. The analytical results are summarised in Table 1 below. Amongst the 10 samples collected, Category H sediment was found at 7 locations (G01, G03 to G05, G07, G08 and G10) with heavy metals contamination level (i.e. Chromium (Cr), Copper (Cu), Lead (Pb), Nickel (Ni), Silver (Ag) and/or Zinc (Zn)) exceeding the corresponding Upper Chemical Exceedance Level (LCEL). The remaining 3 samples (i.e. G02, G06 and G09) were found to be Category L sediment. No samples were found to have contaminant levels exceeding 10 times the Lower Chemical Exceedance Level (LCEL) and as such Type 3 sediment as per ETWB TCW No. 34/2002 was not identified. As no Category M or Category H sediment with one or more contaminant levels exceeding 10 times the LCEL, Tier III biological screening was considered not necessary.

Review of Sediment Quality Data

6.1.9 To compare the relative sediment contamination at YTB to nearby environment, the

available sediment quality data at Kai Tak Approach Channel (KTAC) and Kwun Tong Typhoon Shelter (KTTS) are extracted and presented in Table 1. The sediment quality data are extracted from the South East Kowloon Development EIA Report in 2001 and Environmental Protection Department (EPD) monitoring programme in the period from 2004 to 2008.

6.1.10 Based on the review of the sediment quality data, the following findings had been identified:

� Similar to YTB, sediment in the nearby KTAC and KTTS are found to be highly contaminated. The sediment contamination levels at YTB generally fall within the range of KTAC and KTTS. Four samples out of the 53 samples under YTB-EIA were found to have higher contamination levels than KTAC and KTTS. However the samples were isolated and located at the lower sediment layer at depth of at least 1.7m below seabed. As shown in Table 1, heavy metals were found to be the main contaminants for marine sediment in YTB as well as KTAC and KTTS.

� TBT levels in sediments were high in the surface sediment of YTB. However, as discussed in the YTB-EIA, in a survey commissioned by EPD in 1994, the maximum concentrations of TBT recorded in sediment beneath vessel hoists in the Causeway Bay and Aberdeen Marinas were 53,000 and 18,300 ng Sn/g respectively

1. The

average median value for all sites in the study was approximately 500 ng Sn/g. The highest TBT concentrations recorded in YTB were at vibrocore locations V6 and V9B and the corresponding TBT levels were 944.5 and 906.3 ng Sn/g respectively. The findings indicate that the TBT levels at YTB were comparable to the surrounding areas. It should also be noted that according to the current ETWB TCW No. 34/2002, only the testing of TBT levels in interstitial water is required. Based on the recent SI results in 2009, except for one surface sediment sample, the TBT levels in interstitial water were all below the LCEL. The TBT level in interstitial water for the remaining sample at G10 was 0.23 µg/L and just exceeded the UCEL of 0.15 µg/L.

1 Ko M M C, Bradley G C, Neller A H and Broom M J. 1995. Tributyltin contamination of marine sediments of Hong Kong. Marine Pollution Bulletin 31 (4-12): 249-253.


6

� According to the approved Kai Tak Development (KTD) Schedule 3 EIA Study2, in-

situ bioremediation and some localized dredging to maintain sufficient water depth will be carried out as measures to tackle the odour problem at KTAC and KTTS. However, no direct measures were considered necessary to specifically address the elevated heavy metals concentration in the marine sediment. Based on the sediment quality data in Table 1 and if the principle of the KTD EIA Report were to be adopted at YTB Development, unless there are odour nuisance arising from the sediment at YTB contaminated by shipyard operations to nearby occupants, no mitigation measures were considered necessary for the contaminated sediment at YTB.

� The release of contaminants from berthing and bioaccumulation of contaminants in fisheries are affected mostly by the surface sediment. Based on the recent site investigation data in 2009, 30% of the surface sediment grab samples collected are not contaminated (i.e. the contaminant levels are below the LCEL). Although the remaining 70% of the surface samples are contaminated (i.e. above the UCEL), all the contaminants levels are comparable to the sediment quality at KTAC and KTTS. Indeed, these 70% of samples are not considered highly contaminated as their levels are well below 10 times LCEL and no Type 3 sediment was identified.

2 Maunsell Consultants Asia Ltd., Kai Tak Development Environmental Impact Assessment Report (Agreement No. CE

35/2006(CE) Kai Tak Development Engineering Study cum Design and Construction of Advance Works – Investigation, Design and Construction, 2008

Yau T

ong B

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Decom

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Sites

Pro

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.

.

7

Tab

le 1

S

um

mary

of

Sed

imen

t Q

uality

Data

Co

lle

cte

d in

YT

B a

nd

KT

AC

/ K

TT

S

Sam

plin

g ID

M

eta

ls (

mg

/kg

) P

AH

(µ

g/k

g)

To

tal

PC

B

(µg

/kg

) T

BT

(µ

g/L

) T

BT

(µ

g/k

g)

Overa

ll

Cate

go

ryc

Dis

po

sal

Typ

ec

Ag

A

s

Cd

C

r C

u

Ni

Pb

Z

n

Hg

L

Wa

HW

b

LC

EL

1

12

1.5

80

65

40

75

200

1

550

1700

23

0.1

5

-

UC

EL

2

42

4

160

110

40

110

270

2

3160

9600

180

0.1

5

-

Recent S

I in

2009 a

t Y

TB

G01 (

gra

b)

3.6

7

0.9

128

208

36

84

360

0.5

1

<550

1700

<3

0.0

24

NA

H

T

yp

e 2

G02 (

gra

b)

0.2

2

<0.2

38

22

17

35

79

0.1

7

<550

<1700

<3

0.0

09

NA

L

Type 1

G03 (

gra

b)

1.6

7

0.5

81

144

28

235

234

0.3

<

550

<1700

<3

0.0

38

NA

H

T

yp

e 2

G04 (

gra

b)

1.1

8

0.5

69

94

18

220

556

0.2

8

<550

4200

<3

0.0

11

NA

H

T

yp

e 2

G05 (

gra

b)

0.5

7

0.3

49

106

13

36

501

0.4

7

<550

<1700

<3

0.0

2

NA

H

T

yp

e 2

G06 (

gra

b)

0.2

3

<0.2

29

14

17

24

94

0.2

3

<550

<1700

<3

0.1

5

NA

L

Type 1

G07 (

gra

b)

2.9

9

1.3

205

217

50

100

648

0.5

5

<550

<1700

<3

0.0

77

NA

H

T

yp

e 2

G08 (

gra

b)

1.4

4

1.5

88

169

32

131

753

0.6

2

1260

3200

<30

d

0.0

15

NA

H

T

yp

e 2

G09 (

gra

b)

0.1

3

<0.2

30

14

19

25

90

0.1

<

550

<1700

<3

0.0

17

NA

L

Type 1

G10 (

gra

b)

2.8

8

1.3

212

206

54

106

649

0.6

8

<550

<1700

<3

0.2

3

NA

H

T

yp

e 2

YT

B-E

IA R

eport

V1 (

0.0

– 0

.5m

) N

A

NA

<

0.5

62

180

15

65

180

<0.4

47

492

<10

NA

<10

H

Typ

e 2

V1 (

0.9

– 1

.0m

) N

A

NA

<

0.5

7

22

<6

44

40

<0.4

20

34

<10

NA

<10

L

Type 1

V1 (

1.9

– 2

.0m

) N

A

NA

<

0.5

26

27

13

60

64

0.7

28

99

<10

NA

<10

M

Type 1

/ 2

V1 (

2.9

– 3

.0m

) N

A

NA

<

0.5

28

27

10

22

57

<0.4

26

107

<10

NA

<10

L

Type 1

V1 (

5.8

– 5

.9m

) N

A

NA

<

0.5

14

<10

7

29

27

<0.4

24

17

<10

NA

<10

L

Type 1

V

1 (

8.8

– 8

.9m

) N

A

NA

<

0.5

44

20

41

35

93

<0.4

20

5

<10

NA

<10

H

Typ

e 2

V2 (

0.0

– 0

.5m

) N

A

NA

<

0.5

59

170

15

210

150

<0.4

61

409

<10

NA

<10

H

Typ

e 2

V2 (

1.0

– 1

.1m

) N

A

NA

<

0.5

50

110

16

51

100

<0.4

47

312

<10

NA

<10

M

Type 1

/ 2

V2 (

1.9

– 2

.0m

) N

A

NA

<

0.5

35

87

12

130

78

<0.4

236

1488

<10

NA

<10

H

Typ

e 2

V2 (

2.9

– 3

.0m

) N

A

NA

<

0.5

24

22

13

67

90

<0.4

144

643

<10

NA

<10

L

Type 1

V2 (

5.8

– 5

.9m

) N

A

NA

<

0.5

6

<10

<6

34

20

<0.4

15

3

<10

NA

<10

L

Type 1

V

3 (

0.0

– 0

.5m

) N

A

NA

<

0.5

57

170

15

53

140

<0.4

56

516

<10

NA

<10

H

Typ

e 2

V3 (

1.0

5 –

1.2

5m

) N

A

NA

<

0.5

67

240

15

110

130

<0.4

108

392

<10

NA

<10

H

Typ

e 2

V3 (

1.8

– 2

.0m

) N

A

NA

<

0.5

61

130

16

120

170

1

247

2051

<10

NA

<10

H

Typ

e 2

V3 (

2.8

– 3

.0m

) N

A

NA

<

0.5

15

<10

9

11

34

<0.4

53

22

<10

NA

<10

L

Type 1

V3 (

5.8

– 5

.9m

) N

A

NA

<

0.5

5

<10

<6

39

25

<0.4

29

4

<10

NA

<10

L

Type 1

V4 (

0.0

– 0

.5m

) N

A

NA

<

0.5

49

150

13

62

200

<0.4

167

629

<10

NA

<10

H

Typ

e 2

V4 (

1.0

– 1

.1m

) N

A

NA

<

0.5

100

250

22

87

240

0.9

177

1350

<10

NA

<10

H

Typ

e 2

V4 (

1.9

– 2

.0m

) N

A

NA

<

0.5

36

64

18

910

290

4.5

269

2286

<10

NA

<10

H

Typ

e 2

V4 (

2.9

– 3

.0m

) N

A

NA

<

0.5

21

<10

12

<15

45

<0.4

16

18

<10

NA

<10

L

Type 1

V4 (

5.7

– 5

.8m

) N

A

NA

<

0.5

13

<10

10

24

39

<0.4

18

5

<10

NA

<10

L

Type 1

V5 (

0.0

– 0

.5m

) N

A

NA

<

0.5

49

190

14

98

140

<0.4

73

322

<10

NA

<10

H

Typ

e 2

Yau T

ong B

ay –

Decom

mis

sio

nin

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yard

Sites

Pro

ject

Pro

file

M

ain

Wealth D

evelo

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ent

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.

.

8

Sam

plin

g ID

M

eta

ls (

mg

/kg

) P

AH

(µ

g/k

g)

To

tal

PC

B

(µg

/kg

) T

BT

(µ

g/L

) T

BT

(µ

g/k

g)

Overa

ll

Cate

go

ryc

Dis

po

sal

Typ

ec

Ag

A

s

Cd

C

r C

u

Ni

Pb

Z

n

Hg

L

Wa

HW

b

LC

EL

1

12

1.5

80

65

40

75

200

1

550

1700

23

0.1

5

-

UC

EL

2

42

4

160

110

40

110

270

2

3160

9600

180

0.1

5

-

V5 (

0.3

– 0

.5m

) N

A

NA

<

0.5

75

91

25

190

270

0.9

253

2015

<10

NA

<10

H

Typ

e 2

V5 (

1.3

– 1

.5m

) N

A

NA

0.7

230

21

64

190

540

1.1

147

1178

<10

NA

<10

H

Typ

e 2

V5 (

2.3

– 2

.5m

) N

A

NA

<

0.5

48

140

11

27

80

<0.4

35

282

<10

NA

<10

H

Typ

e 2

V5 (

3.3

– 3

.5m

) N

A

NA

<

0.5

110

180

27

100

270

1.5

224

1430

<10

NA

<10

H

Typ

e 2

V5 (

5.3

– 5

.5m

) N

A

NA

<

0.5

12

<10

<6

20

28

<0.4

11

3

<10

NA

<10

L

Type 1

V5 (

8.2

– 8

.4m

) N

A

NA

<

0.5

13

<10

<6

86

28

<0.4

18

5

<10

NA

<10

M

Type 1

/ 2

V6 (

0.0

– 0

.5m

) N

A

NA

0.7

330

420

45

150

400

0.6

603

3880

<10

NA

2970

H

Typ

e 2

V6 (

0.4

– 0

.6m

) N

A

NA

0.8

160

470

42

170

240

0.7

201

896

<10

NA

<10

H

Typ

e 2

V6 (

1.4

– 1

.6m

) N

A

NA

1

220

690

54

160

330

0.7

174

804

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NA

<10

H

Typ

e 2

/ 3

V6 (

2.4

– 2

.6m

) N

A

NA

0.9

190

640

50

120

280

0.7

122

794

<10

NA

<10

H

Typ

e 2

V6 (

3.4

5 –

3.6

5m

) N

A

NA

<

0.5

61

98

19

200

180

1.9

146

662

<10

NA

610

H

Typ

e 2

V6 (

5.7

– 5

.9m

) N

A

NA

<

0.5

15

<10

<6

20

25

<0.4

21

24

<10

NA

<10

L

Type 1

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0.0

– 0

.5m

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A

NA

0.5

140

490

28

220

470

0.5

904

1732

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NA

210

H

Typ

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V7 (

1.1

5 –

1.3

5m

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A

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1.1

230

540

53

100

350

0.7

154

953

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NA

290

H

Typ

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V7 (

2.1

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2.3

5m

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A

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0.6

30

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16

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54

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24

15

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L

Type 1

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24

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<15

43

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12

13

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L

Type 1

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5m

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A

NA

1.1

92

110

20

150

330

2.6

218

1707

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NA

<10

H

Typ

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V7 (

9.2

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5m

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A

NA

<

0.5

<

5

<10

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30

27

<0.4

14

87

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NA

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L

Type 1

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11.7

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1.9

m)

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N

A

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14

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20

24

<0.4

13

4

<10

NA

<10

L

Type 1

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– 0

.5m

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A

NA

1.5

220

350

36

220

440

0.8

275

1871

<10

NA

1900

H

Typ

e 2

V8A

(1.8

– 2

.0m

) N

A

NA

2

320

540

87

620

640

3.6

26326

55539

<10

NA

630

H

Typ

e 2

/ 3

V8A

(2.7

– 2

.9m

) N

A

NA

2.5

610

770

200

900

600

1.2

975

2327

<10

NA

290

H

Typ

e 2

/ 3

V8A

(3.7

– 3

.9m

) N

A

NA

1.2

34

56

11

250

250

1.9

146

1525

<10

NA

<10

H

Typ

e 2

V8A

(4.7

– 4

.9m

) N

A

NA

1.2

18

<10

10

21

43

<0.4

16

60

<10

NA

<10

L

Type 1

V8A

(7.7

– 7

.9m

) N

A

NA

<

0.5

<

5

<10

<6

<15

<15

<0.4

13

4

<10

NA

<10

L

Type 1

V9B

(0.0

– 0

.5m

) N

A

NA

1.7

310

420

43

210

430

0.7

275

2043

<10

NA

2850

H

Typ

e 2

V9B

(1.7

– 1

.9m

) N

A

NA

3.1

920

700

560

100

880

1.2

456

937

<10

NA

<10

H

Typ

e 2

/ 3

V9B

(2.7

– 2

.9m

) N

A

NA

0.6

23

30

13

120

130

2.7

154

1075

<10

NA

<10

H

Typ

e 2

V9B

(3.7

– 3

.9m

) N

A

NA

0.6

27

<10

15

<15

52

<0.4

14

27

<10

NA

<10

L

Type 1

V9B

(6.8

– 7

.0m

) N

A

NA

<

0.5

5

<10

<6

24

20

<0.4

13

10

<10

NA

<10

L

Type 1

V9B

(7.8

– 8

.0m

) N

A

NA

<

0.5

<

5

<10

<6

<15

22

<0.4

19

20

<10

NA

<10

L

Type 1

Sedim

ent

Qualit

y a

t K

TA

C / K

TT

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extr

acte

d fro

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39.3

-

3670

9.9

2 -

192

46.8

-

398

82.2

-

1129

0.2

2 -

3.6

9

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2830

55 -

5915

26 -

1600

NA

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to 5

5

µg S

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om

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310

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570)

2200

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4200)

91

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170)

150

(75 -

400)

470

(370 -

620)

0.8

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(0.5

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0)

130

(110 -

200)

1200

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1900)

240

(150 -

470)

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ong K

ong in 2

008.


10

Hazards towards the Public and Marine Habitat 6.1.11 It was mentioned in the YTB-EIA that the existing seabed of YTB is a potential hazard to the

future YTB CDA as well as the marine habitat. In particular, the contaminated sediment may endanger the public indirectly through the consumption of polluted fishes caught from YTB (for example, leisure fishing).

6.1.12 The EPD initiated a toxic substances monitoring programme in 2004. The purpose is to

monitor and assess the extent of toxic substances pollution in the Hong Kong marine environment, including marine water, sediment, biota and potential land-based pollution sources, such as river, sewage effluent and storm runoff. Based on the 2004-2006 monitoring results

5, the levels of toxic substances in the Hong Kong marine environment

were generally low compared with other parts of the Pearl River Estuary. The levels of toxic substances in marine water, sediment and biota generally met local and international standards for protection of marine life and human health. The summary statistics of the levels of toxic substances in marine water, sediment, biota, extracted from the EPD’s website, is provided in Appendix B.

6.1.13 Based on the findings of the EPD toxic substance monitoring with YTB being part of the

existing Hong Kong marine environment, it is expected that leaving the contaminated sediments in place without concealment at YTB would not jeopardize the compliance of local and international standards for protection of marine and human health.

6.1.14 Referring to the government department comments on Draft Cha Kwo Ling, Yau Tong, Lei

Yue Mun Outline Zoning Plan No. S/K15/15 Review of Yau Tong Bay “Comprehensive Development Area” Zone (TBA Paper No. 7681), EPD has advised that sediments dredging/excavation and their disposal would only proceed if there is an established genuine need. The prime aim is to minimize disturbance to the seabed to avoid adverse environmental impacts and considered that the general strategy is to leave polluted/contaminated sediments in place.

Odour Nuisance to Nearby Residents

6.1.15 Another concern for contaminated sediment towards YTB CDA is any odour nuisance

arising from contaminated seabed, especially during summer time.

6.1.16 In order to identify the source of odour, field surveys including odour patrol at Yau Tong Bay were conducted in end August and early September 2008 by the Odour Laboratory of Hong Kong Polytechnics University (HKPU) to determine any existing odour problems in YTB and to identify the source of odour emission if any.

6.1.17 The detailed odour patrol procedures, odour patrol route and patrol results are presented in

Appendix C. 6.1.18 During the patrol, odour was detected at some locations which were identified as diesel

smell from vessels, acid smell from metallic waste and construction waste on vessels, moldy smell due to floating debris on the seawater surface and sewage smell in the vicinity of an existing outfall. Apart from the sewage smell in the vicinity of an existing outfall, the other odour sources were all above water and are considered not due to the contaminated sediment. Since the odour sources associated with the existing above-water activities would cease upon the proposed development, these odour sources shall not be a concern to the nearby residents upon commencement of the proposed development.

6.1.19 For the odour in the vicinity of the outfall, it is noted that there is no existing shipyard or past

shipyard operations in its vicinity and as such the sewage smell was unlikely caused by the shipyard operations. Indeed, based on the site observation, the possible source of odour is likely from the sediments deposited from the outfall rather than associated with the existing / past shipyard operations.

5 http://www.epd.gov.hk/epd/english/environmentinhk/water/marine_quality/Tox_details.html


11

Release of Contaminants during Berthing of Marine Vessel 6.1.20 According to the YTB-EIA, berthing of marine vessels within YTB was considered to be a

concern as this may cause the release of seabed contaminants. When cruises go moorings, their anchors may disturb the seabed causing the dispersal of contaminants. The released contaminants may even migrate towards the harbour under water current or ship movement.

6.1.21 Based on the current YTB CDA Development Scheme, landing steps for berthing of marine

vessels will be located at the eastern (or inner) portion of YTB, at area of the bay which is furthest away from Victoria Harbour. The distance from the inner portion to the mouth of YTB is over 400 m. In accordance with the Explanatory Statement of OZP No. S/K15/18, the planning intention for the landing steps is for berthing of pleasure boats only and the pleasure boats are not likely to cause disturbance on the seabed sediments. Given the location of the berthing area and the water depth of YTB is not shallow, the impacts associated with the release of contaminants from berthing are expected to be limited.

Conclusion

6.1.22 Based on the revised YTB CDA Development Scheme as well as recent data and study,

apart from the localised odour problem in the vicinity of an existing outfall, it is unlikely that there would be significant adverse impacts to the environment due to the contaminated sediment at YTB and concealment of the contaminated sediment is considered not necessary. As the localised odour problem near the outfall is likely due to the deposited sediments from the outfall rather than existing / past shipyard operations, odour mitigation measures if required will not be considered under this Project.

6.2 Proposed Mitigation Measures 6.2.1 The key mitigation measures recommended in the YTB-EIA that are relevant to this Project

include the following:

Submission of Supplementary CAP, CAR and RAP 6.2.2 In the YTB-EIA, Contamination Assessment Plan (CAP), Contamination Assessment Report

(CAR) and/or Remediation Action Plan for various lots were submitted. However, some of the sites were inaccessible for detailed contaminated soil sampling and assessment during the YTB-EIA and thus not included.

6.2.3 A supplementary Contamination Assessment Plan (CAP), Contamination Assessment

Report (CAR) and/or Remediation Action Plan (RAP) in accordance with the Guidance Note for Contaminated Land Assessment Remediation (GN1), Guidance Notes for Investigation and Remediation of Contaminated Sites of Petrol Filling Stations, Boatyards and Car Repair /Dismantling Workshop (GN2) and Guidance Manual for Use of Risk-based Remediation Goals for Contamination Management (GM) to cover the lots and facilities which were inaccessible for detailed contaminated soil sampling and assessment during the YTB-EIA shall be submitted to EPD for approval at least one month before the commencement of any soil remediation work on these lots. These previously “inaccessible” lots and facilities include the following:

� YTMLs No. 44, 45-46, and 54; and

� the underground oil tank at YTML No. 6-11.

Measures to Mitigate Land Contamination 6.2.4 The Project Proponent shall not reuse any potentially contaminated dredged sediments

excavated on site or import any contaminated dredged sediments to the site for stockpiling, backfilling on the land lots, and/or soil remediation treatments, without seeking prior approval from EPD.


12

Removal of Underground Fuel Storage Tank 6.2.5 The underground storage tank at YTML No. 6-11 shall be removed by the following method:

(a) sludge and miscisible water shall be pumped out from the underground tank and transferred to the groundwater treatment system for treatment;

(b) the oil tank shall then be flushed with steam to allow the tank temperature to reach 60

oC until all residues come off from the tank surface;

(c) the oil tank shall be drained to drums for recovery of oil product and subsequently treated by the groundwater treatment system;

(d) all effluent shall be drained to drums for recovery of oil product and subsequently treated by the groundwater treatment system;

(e) the interior of the tank shall be inspected visually to determine if all oil residues have been removed. If necessary, steam shall be applied to remove local residue and step (d) shall be repeated;

(f) gas free status inside the tank shall be checked and if necessary, repeat the steaming out process;

(g) upon achieving gas free status, the tank shall be flame cut to convenient size for disposal; and

(h) the scrap metal shall be collected by waste collector for recycling.

6.2.6 After the removal of the underground oil tank, visual inspection and further soil sampling to delineate the extent of soil contamination will be carried out. The investigation findings shall be presented in the supplementary CAP, CAR and RAP as discussed above. Remediation of Soil Contaminated with Total Petroleum Hydrocarbon (TPH) Only and Polyaromatic Hydrocarbon (PAHs)

6.2.7 Biopiling method to remediate the TPH and PAHs contaminants in the hotspots identified in

the YTB-EIA and in the supplementary CAP / CAR / RAP shall be adopted.

Remediation of Soil Contaminated with Heavy Metal Only 6.2.8 Solidification method to remediate the heavy metals in the hotspots as identified in the YTB-

EIA and in the supplementary CAP / CAR / RAP shall be adopted.

Remediation of Soil Contaminated with TPH and Heavy Metal 6.2.9 Biopiling method and then solidification method as described above shall be adopted to

decontaminate the soil contaminated with TPH and heavy metals as identified in the YTB-EIA and in the supplementary CAP / CAR / RAP. Soil contaminated with TPH only, and with both TPH and metals shall be biopiled separately.

Remediation of Soil Contaminated with Mercury (Hg) and Polychlorinated Biphenyls (PCB)

6.2.10 Soil contaminated with PCB and mercury as identified in the YTB-EIA and in the

supplementary CAP / CAR/ RAP shall be excavated and dispose to landfill.

Control Measures during Soil Excavation 6.2.11 Dust control practices as in Air Pollution Control (Construction Dust) Regulation during soil

excavation to control dust emissions shall be adopted. The top layers of soils shall be sprayed with water immediately before the excavation.


13

6.2.12 Sufficient number of the decontamination facilities, instruments and equipment shall be provided on site to decontaminate the workers and vehicles before leaving the site.

6.2.13 Where contaminated soils are located below a layer of uncontaminated soil, the clean soil shall be removed and stockpiled separately to the contaminated soil and the clean soil shall be backfilled and/or retained for use as a clean cap.

6.2.14 Detection of free product of TPH, if any, at the groundwater surface, particularly during the excavation near the underground oil tank at YTML No. 6-11 shall be conducted. If free product is identified at any stage during excavation, the free product shall be pumped out from the groundwater for diversion to an oil/water separation unit. The free product removed shall be transported off site for recycling, and the water shall be tested for free TPH product. If the results show that the water is free from floating TPH product, the water shall be re-injected into the groundwater table at the site. Otherwise, the water shall be circulated back to the oil/water separator for additional TPH product separation and removal. Measures for Waste Management

6.2.15 The Project Proponent shall submit a waste management plan (WMP) to EPD for approval. All the measures recommended in the WMP shall be fully implemented in accordance with the requirements and time schedule set out in the approved WMP.

6.2.16 C&D materials generated into public fill which can be reused on-site or disposed of to public

filling areas, and C&D wastes which shall be disposed of to landfill shall be sorted on-site. To minimise off-site disposal, on-site reuse of public fill shall be promoted.

6.2.17 Trip-ticket system to keep track of the disposal of C&D materials and solid waste at public filling areas and landfills shall be setup. Measures to Mitigate Landscape and Visual Impacts

6.2.18 On-site mature trees as required in the YTB-EIA shall be retained. Mature tree shall not be transplanted or fell unless permission has been given by EPD.

6.2.19 Colour hoarding to minimise visual impacts on the nearby sensitive receivers shall be used.

6.2.20 During the biopiling process, the biopiles shall be limited to a height of less than 3m. Measures to Mitigate Noise Impacts

6.2.21 The Project Proponent shall deposit a construction noise mitigation plan (CNMP) to EPD.

The noise mitigation measures as stated in the CNMP shall be fully implemented for the decommissioning work.

6.2.22 Silenced power mechanical equipment (PME) shall be used. The silenced PMEs to be used shall include, but not limited to, mobile crane, dumper, dump truck, excavator, truck mixer, concrete pump, generator and air compressors.

6.2.23 Noise barriers and site hoardings of impervious material with a minimum surface density of 15kg/m

2 shall be used and they shall have no openings or gaps except for the site access.

7 CONCLUSION 7.1 Overall Conclusion 7.1.1 All the potential environmental impacts arising from this Project have been adequately

assessed as part of the works under YTB-EIA, including noise, water quality, waste management and mud contamination, biogas risk, land contamination as well as landscape


14

and visual aspects.

7.1.2 The information and findings in the YTB-EIA are considered to be still relevant to this Project. The relevancy of the YTB-EIA to this Project has been given in Section 3. Besides, discussion on further environmental implications associated with unconcealed contaminated sediment is presented in Section 6.1, and it is considered that there would unlikely to be significant adverse impacts to the environment due to the contaminated sediment at YTB and concealment of the contaminated sediment is considered not necessary.

7.1.3 To conclude, with proper implementation of the recommended mitigation measures stated in the YTB-EIA that are relevant to this Project, no insurmountable environmental impact is expected.

Figure

Appendix ARecent Sediment Sampling and Testing

in YTB in 2009

Appendix AYau Tong Bay Development Recent Sediment Sampling and Testing in YTB in 2009

AECOM Asia Co. Ltd. i 1.0/09Appendix A Recent Sediment Sampling and Testing in YTB in 2009.doc

TABLE OF CONTENTS

Page

1 Sediment Sampling Locations ........................................................................................................ 12 Sediment Sampling Procedures ..................................................................................................... 1

3 Assessment Criteria ........................................................................................................................ 2

4 Laboratory Analysis ........................................................................................................................ 4

4.1 Chemical Testing ................................................................................................................... 44.2 Biological Testing .................................................................................................................. 4

5 Laboratory Results .......................................................................................................................... 6

List of Tables

Table 1 Details of As-Built Sampling LocationsTable 2 Sediment Quality Criteria for the Classification of SedimentTable 3 Testing Parameters, Reporting Limit and Determination MethodTable 4 Summary of Laboratory Analytical Results

List of Figures

Figure A-1 As-Built Sediment Sampling Locations

Appendices

Appendix A-1 Laboratory Testing Reports


AECOM Asia Co. Ltd. 1 1.0/09Appendix A Recent Sediment Sampling and Testing in YTB in 2009.doc

1 SEDIMENT SAMPLING LOCATIONS

1.1.1 A total of ten (10) sampling locations (namely G01 to G10) were proposed in Yau Tong Bay forsediment sampling and testing. G01 and G03 are located in outer Yau Tong Bay; G02, G04 to G06in mid Yau Tong Bay and; G07 to G10 in inner Yau Tong Bay. The as-built sampling locations, withHong Kong metric grid coordinates, are summarized in Table 1 and shown in Figure 1.

1.1.2 Surface sample were collected at each of the sampling locations on 21 April 2009 by means of grabsampling.

Table 1 Details of As-Built Sampling Locations

SamplingLocation ID

CoordinatesEasting Northing

G01 841969 817613G02 842054 817630G03 842004 817459G04 842124 817493G05 842177 817660G06 842213 817571G07 842260 817695G08 842317 817662G09 842288 817614G10 842304 817557

2 SEDIMENT SAMPLING PROCEDURES

2.1.1 Prior to sampling, the laboratory responsible for analysis was consulted for the sample size as well asthe required preservation procedures.

2.1.2 The sediment sampling exercise was carried out by Organic Waste Technologies (H.K.) Limited(OWT) and supervised by AECOM personnel.

2.1.3 Prior to sampling at each location, the sampling location was set out with the aid of a differentialglobal positioning system (DGPS). After the setting out, the depth of water were measured.

2.1.4 Surface sediments were taken by a closed grab sampler. The grab sampler had been thoroughlywashed with seawater prior to each sampling attempt.

2.1.5 The sediment samples were recovered on site and placed in laboratory-provided clean high densitypolyethylene containers / glass bottles with Teflon lined lid and sealed to prevent leakage.

2.1.6 Only new sample containers were used to hold the sediment samples. The containers were labelledwith station number, sample depth, sampling date and time, together with full description of thesample.

2.1.7 The samples were stored, transported and maintained at 4°C or lower without being frozen in darkprior to any laboratory testing. All samples were packed and transported in such a manner as toavoid shock, vibration or any other disturbance of the samples. Samples were delivered tolaboratory after collection on the same day. The chain-of-custody procedure was followed to recordthe flow of sample handling, from collection of samples to delivery of samples to the designatedLaboratory.



3 ASSESSMENT CRITERIA

3.1.1 The ETWB TCW No. 34/2002 - Management of Dredged / Excavated Sediment sets out theprocedure for seeking approval to dredge / excavate sediment and the management framework formarine disposal of dredged / excavated sediment. In the technical circular, a set of sediment qualitycriteria had been defined to classify the dredge / excavate sediment according to the contaminationlevel. The sediment quality criteria for the classification of sediment are presented in Table 2.

Table 2 Sediment Quality Criteria for the Classification of Sediment

ContaminantsLower Chemical

Exceedance Level(LCEL)

Upper ChemicalExceedance Level

(UCEL)Metals (mg/kg dry wt.)Cadmium (Cd) 1.5 4Chromium (Cr) 80 160Copper (Cu) 65 110Mercury (Hg) 0.5 1Nickel (Ni)* 40 40Lead (Pb) 75 110Silver (Ag) 1 2Zinc (Zn) 200 270

Metalloid (mg/kg dry wt.)Arsenic (As) 12 42

Organic-PAHs g/kg dry wt.)Low Molecular Weight PAHs 550 3160High Molecular Weight PAHs 1700 9600

Organic-non-PAHs ( g/kg dry wt.)Total PCBs 23 180

Organometallics g TBT/L inInterstitial water)Tributyltin (TBT)* 0.15 0.15

Note:* The contaminant level is considered to have exceeded the UCEL if it is greater than the value shown

3.1.2 The sediments were categorised with reference to the LCEL and UCEL above as follows:

Category L Lowest contamination level of the sediment category under the ETWBTCW 34/2002 with all contaminant levels not exceeding the LCEL. Thematerial must be dredged, transported and disposed of in a manner thatminimises the loss of contaminants either into solution or by suspension.

Category M Mid contamination level of the sediment category under the ETWB TCW34/2002 with any one or more contaminant levels exceeding the LCEL andnone exceeding the UCEL. The material must be dredged andtransported with care, and must be effectively isolated from theenvironment upon final disposal unless appropriate biological testsdemonstrate that the material will not adversely affect the marineenvironment.

Category H Highest contamination level of the sediment category with any one or morecontaminant levels exceeding the UCEL. The material must be dredgedand transported with great care, and must be effectively isolated from theenvironment upon final disposal.



3.1.3 According to the ETWB TCW No. 34/2002, the proposed dredged / excavated sediments wouldfurther be categorised into different types of disposal arrangements by assessing their levels ofcontamination and/or toxicity. There are 4 types of disposal arrangements stipulated in the ETWBTCW No. 34/2002:

Type 1 Open sea disposal (suitable for Category L sediment with lowestcontamination)

Type 1(Dedicated Sites)

Open sea disposal at dedicated sites. Dedicated sites will be monitoredto confirm that there is no adverse impact due to the disposal (suitable forcertain Category M sediment)

Type 2 Confined marine disposal to designated sites allocated by the Marine FillCommittee (MFC) (suitable for certain Category M and H sediments)

Type 3 Sediment that require special treatment / disposal arrangement (suitablefor certain H sediments with relatively high contamination / toxicity levels).Certain H sediments refer to sediments samples that have contaminantlevels exceeding 10 times the LCEL above and results that failed thetoxicity test (biological test).



4 LABORATORY ANALYSIS

4.1 Chemical Testing

4.1.1 The collected sediment samples were sent to ALS Technichem (HK) Pty Ltd. (ALS), an HOKLASaccredited laboratory, for testing. The samples were tested and analysed in terms of the parameterslisted in Table 3. The reporting limit, preparation method, determination method and the parametersto be tested are shown in Table 3.

Table 3 Testing Parameters, Reporting Limit and Determination MethodParameter Reporting

LimitDetermination Method

Metals / Metalloids (mg/kg dry. wt.)Cadmium (Cd) 0.2 6020Chromium (Cr) 1 6020Copper (Cu) 1 6020Mercury (Hg) 0.05 APHA 3112BNickel (Ni) 1 6020Lead (Pb) 1 6020Silver (Ag) 0.1 6020Zinc (Zn) 1 6020Arsenic (As) 1 6020Organic-PAHs ( g/kg dry wt.)Low Molecular Weight PAHs2 50 8270High Molecular Weight PAHs3 150 8270Organic-non-PAHs ( g/kg dry weight)Total PCBs4 3 8270Organometallics ( g TBT/L in interstitial water)Tributytin 0.005 Krone et al. (1989)5 - GC/MS

UNEP/IOC/IAEA6

Note:1. Determination of acid volatile sulphide and simultaneously extractable metals in sediment. Office of Water

Regulations and Standards, USEPA2. Low molecular weight PAHs include acenaphthene, acenaphthylene, anthracene, fluorene, naphthalene, and

phenanthrene.3. High molecular weight PAHs include benzo(a)anthracene, benzo(a)pyrene, chrysene, dibenzo(a,h)anthracene,

fluoranthene, pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene, indeno(1,2,3-c,d)pyrene andbenzo(g,h,i)perylene.

4. The reporting limit is for individual PCB congeners. Total PCBs include 2,4' diCB, 2,2',5 triCB, 2,4,4' triCB, 2,2',3,5'tetraCB, 2,2',5,5' tetraCB, 2,3',4,4' tetraCB, 3,3',4,4' tetraCB, 2,2',4,5,5' pentaCB, 2,3,3',4,4' pentaCB, 2,3',4,4',5pentaCB, 3,3',4,4',5 pentaCB, 2,2',3,3',4,4' hexaCB, 2,2',3,4,4',5' hexaCB, 2,2',4,4',5,5' hexaCB, 3,3',4,4',5,5' hexaCB,2,2',3,3',4,4',5 heptaCB, 2,2',3,4,4',5,5' heptaCB, 2,2',3,4',5,5',6 heptaCB (ref: the "summation" column of Table 9.3 ofEvaluation of Dredged Material Proposed for Discharge in Waters of the U.S. - Testing Manual (The Inland TestingManual) published by USEPA).

5. Krone et al. (1989), A method for analysis of butyltin species and measurement of butyltins in sediment and EnglishSole livers from Puget Sound, Marine Environmental Research 27 (1989) 1-18. Interstitial water to be obtained bycentrifuging the sediment and collecting the overlying water.

6. UNEP/IOC/IAEC refers to IAEA’s Marine Environment Laboratory reference methods. Interstitial water to be obtainedby centrifuging the sediment and collecting the overlying water.

QA/QC Requirements

4.1.2 The following QC plan has been implemented for the laboratory testing:

Method Blank Duplicate (at 5% level i.e. one for every 20 samples) Matrix Spike (at 5% level i.e. one for every 20 samples)

4.2 Biological Testing

4.2.1 As per the ETWB TCW No. 34/2002, biological testing (Tier III screening) would be required on thecollected sediment samples if the chemical testing results indicated either (i) the sediment sample isclassified as Category M or (ii) the sediment sample is classified as Category H and with one or more



contaminant levels exceeding 10 times the LCEL. The tests required for the biological testing areshown below:

10-day burrowing amphipod toxicity test ; 20-day burrowing polychaete toxicity test; and 48-96 hour larvae (bivalve or echinoderm) toxicity test.

4.2.2 However, based on the chemical testing results carried out under this study, biological testing wasconsidered not necessary as there were no sediment samples that fell within the above two cases (i.e.Category M or Category H and with one or more contaminant levels exceeding 10 times the LCEL).The chemical testing results are discussed in Section 5 below.



5 LABORATORY RESULTS

5.1.1 The sediment quality results and the classification of the sediment samples are summarised inTable 4 and the laboratory reports are attached in Appendix A-1.

5.1.2 Amongst the 10 samples collected, category H sediment was found at 7 locations (G01, G03 to G05,G07, G08 and G10) with heavy metals contamination level (i.e. Cr, Cu, Pb, Ni, Ag and/or Zn)exceeding the corresponding UCEL. The remaining 3 samples (i.e. G02, G06 and G09) were foundto be category L sediment. No samples were found to have contaminant levels exceeding 10 timesthe LCEL and as such Type 3 sediment, in accordance with the ETWB TCW No. 34/2002, was notidentified.

5.1.3 In accordance with the ETWB TCW No.34/2002, biological testing is considered not necessary asthere were no Category M or and Category H (>10 x LCEL) sediment found amongst the 10 sedimentsamples.

5.1.4 In respect to organic contamination, PAHs were only detected at G01, G04 and G08 with measuredlevels at G04 and G08 exceeding LCEL but below the UCEL. There was one UCEL exceedance inTBT, found at G8 whereas no PCBs congeners were detected in any of the samples.

Data Quality

5.1.5 The quality control data for the testing of metal, metalloid, organics and organometallics as presentedin the Laboratory Testing Report in Appendix A-1 indicates that the chemical testing results are ofacceptable quality.



Table 4 Summary of Laboratory Analytical Results

SamplingID Depth (m)

Metals (mg/kg) PAH ( g/kg) Total PCBg/kg)

TBTg/L)

Overall Category

Ag As Cd Cr Cu Ni Pb Zn Hg LW1 HW2

LCEL - 1 12 1.5 80 65 40 75 200 1 550 1700 23 0.15

UCEL - 2 42 4 160 110 40 110 270 2 3160 9600 180 0.15

ReportingLimit 0.1 0.1 1 0.2 1 1 1 1 1 0.05 550 1700 3 0.005

G01 7.5 3.6 7 0.9 128 208 36 84 360 0.51 <550 1700 <3 0.024 H

G02 6.9 0.2 2 <0.2 38 22 17 35 79 0.17 <550 <1700 <3 0.009 L

G03 8.0 1.6 7 0.5 81 144 28 235 234 0.3 <550 <1700 <3 0.038 H

G04 6.6 1.1 8 0.5 69 94 18 220 556 0.28 <550 4200 <3 0.011 H

G05 6.9 0.5 7 0.3 49 106 13 36 501 0.47 <550 <1700 <3 0.02 H

G06 8.0 0.2 3 <0.2 29 14 17 24 94 0.23 <550 <1700 <3 0.15 L

G07 2.9 2.9 9 1.3 205 217 50 100 648 0.55 <550 <1700 <3 0.077 H

G08 2.2 1.4 4 1.5 88 169 32 131 753 0.62 1260 3200 <303 0.015 H

G09 6.5 0.1 3 <0.2 30 14 19 25 90 0.1 <550 <1700 <3 0.017 L

G10 4.6 2.8 8 1.3 212 206 54 106 649 0.68 <550 <1700 <3 0.23 H

Notes:1. LW - Low molecular weight PAHs (ie acenaphthene, acenaphthylene, anthracene, fluorene, naphthalene and phenanthrene).2. HW - High molecular weight PAHs, (ie benzo[a]anthracene, benzo[a]pyrene, chrysene, dibenzo[a,h]anthracene, fluoranthene, pyrene, benzo[b]fluoranthene, benzo[k]fluoranthene,indeno[1,2,3-c,d]pyrene and benzo[g,h,i]perylene).3. Particular samples required dilution prior to PCB analysis due to matrix interference. No PCB congeners were however detected in the sample.* Values underlined only indicate exceedance in LCEL but belo w the UCEL under ETWB TCW No.34/2002.** Values in bold indicate exceedance in UCEL under ETWB TCW No.34/2002.*** Values in bold and underlined indicate exceedance in UCEL and 10 times the level of LCEL under ETWB TCW No.34/2002.

Appendix BSummary Statistics of the Levels of Toxic

Substances in Marine Water, Sediments and Biota

Table 1 Concentrations of toxic substances1 (μg l-1) in marine waters of Hong Kong

WatersDioxin-likePCBs2,3 Σ Dioxins/furans,

dioxin-like PCBs2, 3 TBTs3 Nonylphenol2Nonylphenolethoxylates2

Arsenic- inorganic

Arsenic - total Zinc

Deep Bay 0.281 <2 0.27 0.68 2.9 3.5 34(2.7 - 3) (3.2 - 4.0) (30 - 41)

0.281 <2 <0.01 0.1 2.0 2.0 <10

North Western 1.180 4 <0.01 0.07 1.2 2.6 25(3 - 5) (1.1 - 1.5) (2.3 - 3.0) (<10 - 60)

Southern 0.281 4 <0.01 <0.04 1 1.9 10(3 - 6) (<1 - 11) (1.8 - 2.0) (<10 - 20)

Victoria Harbour 0.282 2 <0.01 0.13 1 1.7 13(2 - 3) (<1 - 1) (1.4 - 2.0) (<10 - 30)

0.281 5 <0.01 0.16 1.1 2.2 20(3 - 7) (<1 - 1.5) (2.0 - 2.3) (<10 - 50)

Junk Bay 0.282 <2 <0.01 <0.04 1.0 2.0 80

Mirs Bay 0.284 <2 <0.01 <0.04 1.0 2.0 <10

Tolo Harbour 0.280 <2 <0.01 0.08 <1.0 2.0 20

0.280 <2 0.04 0.06 <1.0 2.1 13(2.0 - 2.1) (<10 - 30)

2 Data in 2005 only;3 Dioxins/furans, dioxin-like PCBs,Σ Dioxins/furans,

dioxin-like PCBs in WHO-TEQ pg l-1; TBTs in ng l-1.TBTs include monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT).DDTs include p,p'-DDE, p,p'-DDD and p,p'-DDT.In calculating mean or total values, half of the reporting limits were used if data were below reporting limits.

1 Chemicals not included above were below reporting limits (μg l-1), i.e. PAHs <0.05, total PCBs <3.6, DDTs <0.001, TBT <0.001, HCHs <0.01, phenol <0.5, Cd <0.5;

JM32

MM132

TM22

TM7

2.846

2.845

2.845

3.127

3.130

Station

DM1

DM52

NM2

SM18

VM5

VM12

3.125

2.848

2.848

2.846

2.845

3.130

3.127

Dioxins/furans2,3

2.848

2.864

2.848

3.125

3.129

3.145

4.028

3.129

Table 2 Concentrations of toxic organic substances (ng g -1 dry wt) and inorganic substances (μg g -1 dry wt) in marine sediments of Hong Kong

Waters StationDioxin-like

PCBs1,2 Σ Dioxins/furans,dioxin-like PCBs1,2 PAHs total PCBs DDT DDTs HCHs1 TBT TBTs Phenol Nonylphenol1

Nonylphenolethoxylates1 PBDEs1

Deep Bay DS1 4.69 215 18 <2 3 0.45 <0.5 2.8 138 360 307 13.8(4.27 - 5.12) (173 - 257) (18 - 18) (3 - 3) (0.43 - 0.47) (0.9 - 5) (<100 - 400) (150 - 570) (123 - 490) (11.3 - 16.4)

DS4 1.08 134 18 2 4 0.16 0.4 1.3 <100 345 71 1.4(0.94 - 1.22) (111 - 165) (18 - 18) (<2 - 3) (3 - 4) (0.16 - 0.16) (<0.5 - 0.5) (1 - 1.6) (340 - 350) (48 - 93) (0.1 - 2.8)

North Western NS2 1.16 179 18 <2 3 0.24 3.1 7.6 <100 220 105 1.8(0.80 - 1.52) (114 - 268) (18 - 18) (3 - 3) (0.23 - 0.24) (<0.5 - 6.6) (1.8 - 13.0 (210 - 230) (57 - 152) (0.3 - 3.2)

Southern SM18 0.51 122 18 <2 3 0.28 <0.5 2.4 <100 122 128 0.1(0.46 - 0.56) (121 - 123) (18 - 18) (3 - 3) (0.27 - 0.29) (1.1 - 3.2) (94 - 150) (66 - 190) (0.1 - 0.1)

Victoria Harbour VS5 3.39 769 26 2 15 0.14 6.9 10.7 <100 1155 1090 0.2(3.25 - 3.53) (712 - 840) (20 - 38) (<2 - 5) (6 - 24) (0.13 - 0.15) (<0.5 - 14) (0.6 - 22.2) (910 - 1400) (860 - 1320) (0.1 - 0.3)

VS9 0.69 147 20 <2 3 0.17 <0.5 11.5 <100 2900 380 6.8(0.40 - 0.98) (123 - 177) (18 - 38) (3 - 3) (0.17 - 0.17) (0.8 - 23.4) (2900 - 2900) (340 - 420) (4.1 - 9.5)

Junk Bay JS2 2.51 299 18 2 5 0.16 <0.5 6.0 <100 1375 1680 2.8(1.84 - 3.19) (282 - 312) (18 - 18) (<2 - 4) (5 - 5) (0.16 - 0.17) (5.2 - 6.7) (650 - 2100) (620 - 2740) (1.9 - 3.6)

Mirs Bay MS13 0.69 110 18 <2 3 0.38 <0.5 0.6 <100 825 817 0.2(0.30 - 1.09) (109 - 112) (18 - 18) (3 - 3) (0.37 - 0.39) (0.6 - 0.6) (150 - 1500) (123 - 1510) (0.1 - 0.3)

Tolo Harbour TM2 1.82 305 20 <2 9 0.25 <0.5 8.3 1025 2100 495 2.4(1.39 - 2.25) (179 - 521) (18 - 24) (4 - 13) (0.25 - 0.26) (5.7 - 10.9) (<100 - 2000) (1800 - 2400) (410 - 580) (0.5 - 4.2)

TM7 1.42 134 18 <2 3 0.24 <0.5 3.4 63 485 97 0.8(1.31 - 1.53) (124 - 143) (18 - 18) (3 - 3) (0.22 - 0.26) (1.8 - 7) (<100 - 100) (420 - 550) (94 - 99) (0.5 - 1.2)

Waters Station Arsenic -inorganic Barium Beryllium Copper Mercury Selenium Silver Thallium Tin

Deep Bay DS1 4.3 38 1.1 55 0.10 0.6 0.7 0.30 7.5(3 - 5) (28 - 46) (0.9 - 1.2) (37 - 77) (0.10 - 0.12) (0.2 - 1.2) (0.5 - 0.8) (0.26 - 0.35) (4 - 12)

DS4 6.3 18 2.2 11 <0.05 <0.2 <0.2 0.10 2.0(5.6 - 6.9) (17 - 18) (1.9 - 2.4) (9 - 14) (0.08 - 0.12) (1.6 - 2.4)

North Western NS2 5.0 26 1.1 26 0.09 0.6 0.4 0.21 3.5(4.7 - 5.9) (23 - 28) (1.0 - 1.2) (23 - 29) (0.07 - 0.10) (0.6 - 0.7) (0.4 - 0.5) (0.18 - 0.22) (3 - 3.7)

Southern SM18 4.4 33 1.3 14 0.08 0.8 <0.2 0.21 2.6(3.9 - 4.8) (27 - 38) (1.2 - 1.3) (13 - 16) (0.06 - 0.10) (0.8 - 0.9) (0.2 - 0.22) (2.4 - 2.7)

Victoria Harbour VS5 2.8 46 1.5 163 0.46 0.8 8.5 0.53 21.3(1.8 - 3.7) (44 - 49) (1.3 - 1.6) (160 - 170) (0.44 - 0.47) (0.4 - 1.2) (8.1 - 9.2) (0.52 - 0.54) (21 - 22)

VS9 1.9 25 1.3 59 0.14 1.0 0.7 0.22 3.9(1.6 - 2.1) (18 - 30) (1.2 - 1.3) (40 - 69) (0.12 - 0.16) (1.0 - 1.0) (0.6 - 0.9) (0.19 - 0.23) (3.4 - 4.6)

Junk Bay JS2 4.9 37 1.3 96 0.24 0.3 2.6 0.29 16.5(4.7 - 5.1) (35 - 38) (1.2 - 1.3) (92 - 100) (0.23 - 0.24) (0.2 - 0.3) (2.4 - 2.8) (0.27 - 0.3) (15 - 18)

Mirs Bay MS13 7.2 34 1.1 12 <0.05 <0.2 <0.2 0.21 2.3(7.1 - 7.2) (31 - 37) (1.0 - 1.2) (11 - 12) (0.2 - 0.22) (2.1 - 2.4)

Tolo Harbour TM2 2.9 26 2.5 45 0.11 0.7 1.0 0.77 9.0(2.8 - 3.0) (23 - 28) (2.3 - 2.6) (44 - 46) (0.10 - 0.11) (0.6 - 0.7) (1.0 - 1.0) (0.73 - 0.81) (8.3 - 9.7)

TM7 4.5 31 1.8 29 0.09 1.8 0.4 0.51 4.9(3.6 - 5.3) (26 - 36) (1.7 - 1.8) (27 - 31) (0.07 - 0.10) (0.9 - 2.8) (0.4 - 0.4) (0.48 - 0.54) (4.8 - 5.1)

1 Data in 2005 only;2 Dioxins/furans, dioxin-like PCBs,Σ Dioxins/furans,

dioxin-like PCBs in WHO-TEQ pg g-1 dry wt.

TBTs include monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT).DDTs include p,p'-DDE, p,p'-DDD and p,p'-DDT.In calculating mean or total values, half of the reporting limits were used if data were below reporting limits.

7.0(3.0 - 11.0)

9.84(9.39 - 10.12)

Fluoride

8.6

11.33(11.09 - 11.57)

8.22(7.88 - 8.85)

9.43(7.79 - 12.83)

7.27(7.00 - 7.85)

9.55(8.46 - 10.77)

8.16(7.37 - 8.95)

12.27(11.46 - 13.08)

9.26(8.61 - 9.90)

13.24(10.46 -16.03)

(8.17 - 9.21)

13.05(12.33 - 13.77)

(7.17 - 8.49)

9.41(8.81 - 10.22)

14.88(12.55 - 17.22)

8.13(7.96 - 8.30)

8.50(8.10 - 8.90)

8.69

(7.04 - 7.57)

7.38(7.31 - 7.47)

7.71

Dioxins /furans2

8.65(7.06 - 12.10)

7.24

9.4(8.0 - 11.0)

Arsenic - total

9.5(7.6 - 11.0)

17.0(17.0 - 17.0)

8.1(7.8 - 8.8)

(7.0 - 12.0)

7.8(7.3 - 8.3)

7.7(7.6 - 7.8)

5.4(4.3 - 6.3)

7.6(7.3 - 7.8)

7.6(7.2 - 7.9)

8.6(8.4 - 8.7)

8.8(8.3 - 9.3)(7.0 - 13.0)

10.2

(14.0 - 18.0)16.0

(5.0 - 15.0)10.0

(9.0 - 12.0)10.5

(3.7 - 15.0)9.0

(13.0 - 18.0)15.0

(12.0 - 15.0)13.5

Table 3 Concentraions of toxic substances (ng g-1 wet wt) in marine biota collected from Hong Kong waters

Waters Dioxins/furans1 Dioxin-likePCBs1 Σ Dioxins/furans,

dioxin-like PCBs1 PAHs PCBs TBT TBTs DDT DDTs Methylmercury

Arsenic -inorganic Arsenic - total Selenium

Deep Bay 0.19 0.02 13.1 1.96 <1 6.0 3.7 19.8 5.9 45 1100 920(0.19 - 0.20) (0.02 - 0.02) (9.1 - 17.2) (1.83 - 2.10) (5.5 - 6.5) (2.0 - 4.2) (11.3 - 28.2) (5.8 - 5.9) (40 - 49) (940 - 1300) (640 - 1200)

0.38 0.23 6.9 3.41 <1 1.5 1.7 13.0 8.4 78 2300 870(0.30 - 0.46) (0.14 - 0.32) (6.5 - 7.3) (2.59 - 4.23) (1.5 - 1.5) (0.9 - 1.2) (12.8 - 13.2) (8.3 - 8.6) (63 - 92) (2300 - 2400) (810 - 920)

0.40 0.31 16.3 8.60 <1 7.5 6.4 26.9 41.9 50 4400 980(0.26 - 0.57) (0.02 - 0.70) (10.4 - 22.0) (5.70 - 13.10) (1.5 - 14.0) (1.3 - 12.0) (15.9 - 40) (26.3 - 63.6) (<40 - 81) (3000 - 5800) (700 - 1300)

0.19 0.17 7.9 8.57 1 6.3 5.4 22.5 68.9 <40 450 420(0.17 - 0.20) (0.02 - 0.39) (7.2 - 8.4) (6.97 - 11.09) (<1 - 2) (1.5 - 13.0) (2.7 - 8.2) (19.6 - 26.8) (43.0 - 84.7) (260 - 620) (340 - 510)

0.24 0.03 11.5 7.45 <1 10.0 0.6 15.2 31.8 <40 5200 940(0.21 - 0.26) (0.03 - 0.03) (11.1 - 11.9) (6.79 - 8.11) (8.5 - 11.5) (0.6 - 0.7) (15 - 15.4) ((31.1 - 32.5) (5100 - 5300) (920 - 950)

0.20 0.01 12.9 3.39 <1 13.5 1.6 7.2 11.9 <40 540 630(0.19 - 0.22) (0.01 - 0.01) (12.0 - 13.9) (3.16 - 3.67) (13.0 - 14.0) (1.6 - 1.7) (7.2 - 7.3) (10.9 - 12.8) (440 - 630) (530 - 720)

0.22 0.08 8.2 3.40 <1 1.8 1.9 10.1 2.0 <40 2600 670(0.19 - 0.25) (0.01 - 0.16) (5.9 - 10.7) (3.00 - 4.00) (1.5 - 2.0) (1.1 - 2.8) (9.8 - 10.8) (1.3 - 2.6) (2000 - 3800) (460 - 910)

0.19 0.01 15.4 1.00 <1 2.0 0.5 2.8 88.0 <40 1800 760(0.19 - 0.20) (0.01 - 0.01) (15.1 - 15.6) (0.90 - 1.10) (2.0 - 2.0) (0.2 - 0.7) (2.2 - 3.2) (84.3 - 91.6) (1500 - 2000) (710 - 810)

Mirs Bay 0.19 0.01 23.8 0.19 <1 1.0 1.6 5.0 1.1 71 2900 1200(0.19 - 0.19) (0.01 - 0.01) (23.1 - 24.5) (0.18 - 0.20) (0.9 - 1.0) (1.5 - 1.7) (4.8 - 5.6) (<1.5 - 1.5) (63 - 79) (2600 - 3100) (1000 - 1300)

Port Shelter 0.14 0.03 4.1 0.46 <1 1.5 0.5 1.9 38.8 <40 1500 590(0.11 - 0.17) (0.02 - 0.03) (3.8 - 4.4) (0.30 - 0.61) (1.5 - 1.5) (0.2 - 0.7) (1.2 - 2.6) (26.1 - 51.5) (1300 - 1800) (500 - 680)

0.20 0.02 5.6 0.35 <1 1.5 0.2 1.5 1.7 93 2200 280(0.20 - 0.20) (0.02 - 0.03) (5.6 - 5.6) (0.33 - 0.37) (1.5 - 1.5) (0.1 - 0.2) (1.4 - 1.5) (1.6 - 1.9) (92 - 93) (2100 - 2400) (270 - 280)

0.19 0.01 16.7 0.91 <1 4.0 0.5 2.9 4.7 <40 790 690(0.19 - 0.19) (0.01 - 0.01) (14.4 - 19.0) (0.87 - 0.95) (4.0 - 4.0) (0.4 - 0.6) (2.8 - 3.0) (4.6 - 4.8) (750 - 820) (690 - 690)

Tolo Harbour 0.27 0.03 6.0 0.16 <1 1.5 0.2 0.9 6.6 160 1300 570(0.25 - 0.30) (0.03 - 0.03) (6.0 - 6.1) (0.16 - 0.17) (1.5 - 1.5) (0.2 - 0.2) (0.9 - 1.0) (6.3 - 6.9) (160 - 160) (1300 - 1400) (540 - 590)

0.17 0.09 13.3 0.61 <1 3.8 2.7 8.5 3.9 40 680 540(0.14 - 0.19) (0.01 - 0.17) (7.2 - 21.5) (0.52 - 0.72) (1.5 - 6.0) (1.2 - 4.4) (6.2 - 10.7) (1.7 - 1.9) (<40 - 57) (640 - 780) (440 - 710)

0.19 0.01 7.8 0.95 <1 3.5 1.8 9.3 114.8 <40 310 370(0.19 - 0.19) (0.01 - 0.01) (7.6 - 8.0) (0.83 - 1.06) (3.0 - 4.0) (1.6 - 2.7) (6.0 - 12.7) (94.6 - 135.0) (270 - 340) (360 - 380)

1 Dioxins/furans, dioxin-like PCBs Σ Dioxins/furans,dioxin-like PCBs in WHO-TEQ pg g-1 wet wt.

TBTs include monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT).DDTs include p,p'-DDE, p,p'-DDD and p,p'-DDT.In calculating mean or total values, half of the reporting limits were used if data were below reporting limits

0.21

EasternBuffer

NorthWestern

Metapenaeus ensis(0.21 - 0.21)

0.61(0.44 - 0.78)

0.71(0.27 - 1.27)

0.36

Species

Metapenaeus affinis

Oratosquilla inorata

Johnius sp .(0.21 - 0.58)

0.27(0.24 - 0.29)

0.21(0.20 - 0.23)

0.30(0.20 - 0.37)

0.17(0.14 - 0.19)

0.22

(0.20 - 0.20)

0.20(0.20 - 0.21)

0.20(0.20 - 0.20)

Inegocia japonica

0.20(0.20 - 0.20)

Platycephalus indicus

0.30(0.28 - 0.32)

0.26(0.20 - 0.32)

(0.22 - 0.23)0.20

Inegocia japonica

Anadara ferruginea

Oratosquilla oratoria

Siganus oramin

Harpiosquilla harpax

Bucardium fimbriatum

Siganus oramin

Anadara ferruginea

Siganus oramin

Appendix CBaseline Odour Survey at Yau Tong Bay

Yau Tong Bay Redevelopment Baseline Odour Survey at Yau Tong Bay

Appendix C i

TABLE OF CONTENTS

Page

1 Introduction ............................................................................................................................... 1

2 Methodology .............................................................................................................................. 1

3 Odour Patrol Results ................................................................................................................. 2

List of Tables

Table 4.1 Results of Odour Patrol and on-site Observations on 28 August and 1 September 2008Table 4.2 Results of Odour Patrol and on-site Observations on 27 and 30 August 2008

List of Figures

Figure 1. Odour Patrol Area


Appendix C 1

1 INTRODUCTION

1.1 A baseline odour survey at Yau Tong Bay (YTB) area was conducted by Hong Kong PolytechnicsUniversity in end August and early September 2008 in order to ascertain whether the odour wasobjectionable at YTB. The survey included 4 days odour patrol at YTB area to identify any possibleodour sources within YTB and the extent of the potential odour impact from these identified odoursources if any. In-situ hydrogen sulphide (H2S) measurements were also conducted during odourpatrols.

2 METHODOLOGY

Odour Patrol

2.1 Odour patrol means a simple judgment by observers patrolling and sniffing at the area (on land)around Yau Tong Bay and Yau Tong Bay (on sea) to detect any odour at different hours.

2.2 Odour patrols were carried out on 27, 28 and 30 August and 1 September 2008 by two qualifiedodour panel members from the Odour Laboratory of HKPU. They used their olfactory senses todetect/identify any odour problems and the locations of odour sources along the seawall and at YauTong Bay (including the areas in the vicinity of storm outfall). The patrol members were free fromany respiratory illnesses and do not normally work at or live in the area in the vicinity of Yau Tong Bayand any typhoon shelter.

2.3 On 28 August and 1 September 2008, the odour patrol members conducted two patrol exercises intwo different time periods (morning and afternoon/evening) of each day and at least one patrolexercise of each patrol day was conducted during the low tide period of the day.

2.4 On 27 and 30 August 2008, the odour patrol members conducted odour patrol exercises at the lowtide conditions and the noon time (highest temperature period) so as to catch the worse odour impactarising from exposed sediment if any.

2.5 During the odour patrol, the patrol members recorded the weather condition including wind directionand temperature, location where odour was detected, possible source of odour, perceived intensity ofthe odour, duration of odour and characteristics of the odour detected. The relevant meteorologicaldata (e.g. ambient temperature, wind speed and direction, etc.) from the Hong Kong ObservatoryStation during the survey period were also be collected for reference.

2.6 The observers patrolled slowly along the route and use their olfactory senses to detect any odour.There were a few clusters of vessels at moorings. The patrol routes covered the whole watersurface at Yau Tong Bay as far as possible. Figure 1 shows the odour patrol area.

2.7 The perceived intensity detected by odour patrol members was divided into 5 levels which are rankedin order as follows. The staying time at each patrol location was at least 2 -3 minutes to detect theodour intensity and the patrol location was at downwind direction of potential odour source area.The highest perceived intensity at each location during patrol was recorded.

0 Not detected No odour perceived or an odour so weak that it cannot beeasily characterised or described

1 Slight Identifiable odour, slight

2 Moderate Identifiable odour, moderate

3 Strong Identifiable odour, strong

4 Extreme Severe odour


Appendix C 2

H2S measurement

2.8 In conjunction with the odour patrol, on-site H2S measurement was conducted during the odour patrol.The purpose of the measurement was to provide initial idea about the strength of odour emission interms of H2S concentration. The H2S concentration was measured by a portable H2S analyzer(Jerome 631-X H2S analyzer) at the patrol locations identified by the odour patrol members.

3 ODOUR PATROL RESULTS

3.1 The results of odour patrol on 28 August and 1 September 2008 are summarized in Table 4.1.Referring to the odour patrol results on 28 August and 1 September 2008, it indicated that no odournuisance was found along the seawall except slight odour intensity detected at the Location S3, S7,S8, S25, S27 and S28. Based on the findings of the odour surveys, the possible odour emissionsdetected at Location S3 and S8 were due to the diesel smell from vessels. The possible odouremission at Location S7, S25, S27 and S28 were arising from the metallic/construction wastes on thevessels mooring at Yau Tong Bay. No odour was detected at other patrol locations. The resultsalso demonstrated that odour levels in the afternoon sessions were higher than that in the morningsessions.

3.2 The results of odour patrol on 27 and 30 August 2008 are summarized in Table 4.2. Referring to theodour patrol results on 27 and 30 August 2008, slight odour intensity detected at the Locations S2, S6,S7, S16, S25 and S26. No odour was detected at other patrol locations. Based on the on-siteobservation, the possible odour emission at Location S2, S16 and S26 were arising from floatingdebris on seawater surface. Diesel smell was detected at Locations S6 and S7. Sewage smellwas detected at Location S25 which is located in the vicinity of a storm drain outfall. Small quantityof effluent from the outfall was noted during the patrol.

3.3 The patrol results indicated that Yau Tong Bay has a low baseline of odour level. The odour detectedat the some locations are identified as different sources below:

Diesel smell from the nearby vessels

Moldy smell due to the floating debris on the seawater surface

Acid smell from the metallic waste and construction waste on the nearby vessels

Sewage smell due to discharges from the storm drain outfall


Appendix C 3

Table 4.1 Results of Odour Patrol and on-site Observations on 28 August and 1 September 2008


Appendix C 4


Appendix C 5


Appendix C 6

Note: (AT: Air temperature; RH: Relative humidity; WS: Wind speed: WD: Wind direction)


Appendix C 7

Table 4.2 Results of Odour Patrol and on-site Observations on 27 and 30 August 2008


Appendix C 8

Figure 1 Odour Patrol Area

project profile for yau tong bay – decommissioning of

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