repairs to seawall at 28 & 28a childe st, belongil

REPAIRS TO SEAWALL AT 28 & 28A CHILDE ST, BELONGIL

1

RESPONSES TO QUESTIONS BY NSW COASTAL PANEL DATED 4/4/17 ref DOC17/182906. RESPONSES

1. Ocean water levels as requested in item 3(e);

As per the reports previously provided, ocean levels and predicted sea level changes for the Byron Bay embayment have been well documented by WRL (2013) for the design of the nearby rock seawall at Manfred St recently constructed for Byron Shire Council. Refer WRL (2013) Section 13 / Appendix A for ocean levels and predicted sea level changes.

2. Wave heights as requested in item 3(f);

As per the reports previously provided, wave heights for the Byron Bay embayment have been well documented by WRL (2013) for the design of the nearby rock seawall at Manfred St recently constructed for Byron Shire Council. Refer WRL (2013) Section 13 / Appendix A for wave heights.

3. item 3(i): The response indicates that no hydraulic stability assessment has been undertaken. Please confirm that is the case;

This is NOT the case. ICM have checked the hydraulic stability. In the previous response, ICM advised that “the boulders used to construct the present wall are of a similar size, and hydraulic stability as the rock seawall constructed recently for BSC at the seaward end of Manfred St and along the seaward boundary of the private property to the NW of Manfred Streel (Umwelt 2015, WRL 2013).” WRL 2013 provided a detailed hydraulic stability assessment (see Section 8). ICM reviewed their assessment calculations and are agreement. The assessment of required rock size for hydraulic stability by WRL is 1.5 – 5t and that is similar to the size, and stability, of rock that was used for construction of the wall to be repaired and that will be used for repairs. 4. Description of the potential effect of coastal hazards and processes on the coastal

protection works as requested in item 7(a);

As previously advised, the potential effect of coastal hazards and processes on the proposed repair works will be similar to the status quo as they are repair of an existing structure.

The potential effect of specific coastal hazards and processes on the proposed repair works can be summarized as follows:


2

5. Details of the impacts of the coastal protection works on coastal processes and hazards as requested in item 7(b), (c) and (d);

As previously advised, the impacts of the proposed repair works on the coastal processes and hazards will be similar to the status quo as the works are repair of an existing structure.

The impacts of the repair of the existing coastal protection works on coastal processes and hazards can be summarized as follows:

Impact on repaired wall

a) beach erosion

b) shoreline recession

c) coastal lake or watercourse entrance instability

d) coastal inundation

e) coastal cliff or slope instability

f) tidal inundation

g)erosion caused by tidal waters, including the interaction

of those waters with catchment floodwaters

h) Sea level rise and associated climate change impacts

The works are repair of an existing

structure.

The coastal hazards and processes on

the repair works will be the same as

the status quo.

However, the repaired wall will be

better able to resist the present and

future coastal processes and hazards.

In particular, the repairs will reduce the

hazards of:

- coastal and tidal innundation of low

areas due to a breakthrough of the

existing wall

- slope instability along the subject

properties.

- erosion of Belongil Creek and

wetlands due to breakthrough of

Belongil spit

Processes and Hazards

[from NSW Coastal Protection Act 1979]


3

6. A diagram of the potential end effects of the coastal protection works as requested in item 9;

The schematic diagramme from McDougal et al 1987, as specifically referenced by NSW CP in question 7 in their RFI dated 10/2/17 (ref DOC17/82318), was provided as well as a detailed response on assessment of potential end effects. In the consideration of the potential for end effects of the rock wall recently constructed at Manfred Street with a length of 100m, WRL (2013) considered the McDougal et al 1987 diagramme as well as more recent work by NSW researchers (see WRL 2013 Section 8.7.2). WRL concluded that there would be no incremental end effects beyond the status quo ie referring to the McDougal et al 1987 diagramme previously provided:

• L (length of hard / protective structures) = 1,727m

• r (increased end effect recession) = 0m

• S (extent of increased end effect recession) = 0m

• e (erosion) = unchanged

This assessment by WRL was supported by Umwelt 2013 (see Section 5.2.1): “They are a replacement for an existing protection structure, so they would have no incremental (additional) impact beyond the status quo.”

Impact by repaired wall

a) beach erosion

b) shoreline recession

c) coastal lake or watercourse entrance instability

d) coastal inundation

e) coastal cliff or slope instability

f) tidal inundation

g)erosion caused by tidal waters, including the interaction

of those waters with catchment floodwaters

h) Sea level rise and associated climate change impacts

The works are repair of an existing

structure.

The impact of the repair works on the

coastal hazards and processes will be

the same as the status quo

- no change

Processes and Hazards

[from NSW Coastal Protection Act 1979]


4

ICM concluded, similarly, that there will be no incremental end effects from repairing the existing wall with a length of 65m at the subject site. That is, r = 0m and S = 0m as per the McDougal et al 1987 diagramme overlaid on Belongil (Figure ) with dimensions.


5

Figure 1 McDougal et al 1987 diagram applied to Belongil coastline


6

7. We note that your response to item 1 indicates that additional rock may be imported to site to give effect to the difference between the present and typical repair profiles furnished by International Coastal Management. Inadequate information has been provided to enable an assessment of the impacts of the proposed importation of rock. The Coastal Panel requests that information be provided on:

a) The type, size and quantity of rock to be imported;

Type; The existing rock varies but is primarily basalt and greywacke, both of which are hard dense rocks with SG > 2.6 that are suitable for seawalls. Additional rock will be basalt and / or greywacke but either are suitable and the actual type will depend on availability at the time of repairs which is dependent on approvals.

Size; 1.5 - 5t

Quantity; This will depend on recovery rates from beach margins. The estimate is 700t of

additional rock..

b) Calculations (including over-layed cross-sections) to support the percentage of imported rock advised;

Drawings 003, 004, 005 and 006 previously provided, show the as-repaired profile over-laid on the existing profile. This shows an average gross volume of about 4-5 m3/m along the seaward frontage if there is minimal recovery from the beach margins. The side flank tie-ins will be about 50% of this volume, ie about 2.25m3/m.

c) The location where this rock will be transported from;

Potentially suitable quarries include:

• Ballina (NSW, 30 km from Belongil),

• Corndale (NSW, 35 km),

• Tumbulgum (NSW, 60 km),

• Piggabeen (NSW, 75 km) and

• West Burleigh (Qld, 80 km).

d) Transportation method;

Trucks with 12t load.

e) Estimate of truck movements and if necessary, an assessment of associated impacts and identification of any proposed amelioration measures for traffic, noise and air quality.

A total of 60 trucks over about 10 days resulting in about 6 trucks per day, is estimated. Impact on local traffic will be minor and over a short period only. The proposed repair works are a much smaller project than Manfred St that had about 7,000t of rock imported by road.


7

All truck loads will be covered with taut heavy duty purpose fitted tarpaulins to ensure no loss of load or dust. The wheels, tracks and body surfaces of all vehicles and plant leaving the site are to be free of mud and that mud is not carried on to adjacent paved streets or other areas. Broader potential traffic and noise impacts will be managed similarly to the recent Manfred Street rock wall construction project by Byron Shire.

A draft Traffic and Construction Management plan similar to the plan used for the construction of Manfred Street rock wall recently has been prepared (Attachment A – drawing 010) and will be implemented.

f) Access points to and from the site;

Access to and from the site can be from several routes:

• Manfred Street

• Don Street

• Old Jetty site

g) Location of any proposed stockpiling facilities and arrangements, including land ownership of this land; and

Rock will be stockpiled on the road reserve (unformed) and esplanade to seaward of the subject properties as shown on drawing 007 (Attachment A).

The road reserve extends about 10m seaward of the seaward property boundaries and is under the control of Byron Shire. The balance of the Esplanade is land is under control of the State. For these initial repairs, works have been restricted to the road reserve under the control of Byron Shire.

h) Any additional permits or approvals that might be required to give effect to the above-mentioned activities

All necessary approvals will be obtained. The DA Form and the Statement of Environmental Effects has identified that an approval is required under s138 of the Roads Act. Any works on that part of The Esplanade owned by the State will require state approval, however works are not proposed on that part of The Esplanade for these initial repairs.


8

Additional information requested by NSW CP on 11/4/17 for Byron Shire (Ref DOC 17/221837)

1. The life expectancy of the rock walls.

The nominal design life is 30 years.

2. The estimated quantity of new imported rock to be imported.

As per 7(a) above, the estimate is 700t of additional rock.

3. Timing of works, i.e. will each rock wall be completed at one time as a separate project or will the same contractor be using four machines on the Road Reserve at one time.

The individual repair works will be coordinated to proceed in an orderly manner, one property at a time.

4. How rock piles and excavated sand will be contained within the Road Reserve and the estimated quantity of sand lost from the project footprint.

Drawing 007 (included with updated technical drawings in Attachment A), shows the construction and stockpile area. All sand temporarily excavated during repairs will remain in the project area and will be profiled to form a smooth beach at the completion of repairs. No sand will be lost.

5. Better explanation of access requirements and social impacts including number and movements of trucks to and from the site; potential limited public access; reduced public amenity from construction works on the beach; and potential noise impacts.

Truck movements as per 7(e):

• Total of about 60 trucks over 10 days

• Average of about 6 trucks per day

Public access and public amenity from construction works on the beach; Public

accesses to and along the beach will be maintained. Work areas will be kept as small as practical and fenced with safety signage and barricades to restrict public access to work and stockpile areas. On weekends, the fencing will be reduced to a minimum. A traffic management plan which includes pedestrian access to and along the beach is included in the updated drawings (Attachment A).

Noise impacts; Noise will be kept to acceptable limits and methods to achieve this are

included in the pro-forma EMP as per Attachment B.


9

6. Temporal considerations of construction works such as avoidance of shore bird and turtle nesting season and extreme weather events.

The works will have no impacts on shore bird and turtle nesting. An Environmental Management Plan will be prepared similar to the EMP used for the construction of the Manfred St wall that is included as a pro-forma (Attachment B). Before commencement of the works the short and long range weather forecasts will be checked and works will not be commenced unless weather is suitable. Should extreme weather events be predicted during the course of the works that could affect the works, then the works will be suspended and made sound for the predicted weather impacts.

7. Preparation and implementation of a Traffic and Construction Management Plan.

A draft Traffic and Construction Management plan similar to the plan used for the construction of Manfred Street rock wall recently has been prepared (Attachment A – drawing 010) and will be implemented.

Signed

Leslie Angus Jackson

CPEng (National Engineers Register, Institution of Engineers Australia), RPEQ 2876

Date: 21/4/17


10

ATTACHMENT A TECHNICAL DRAWINGS – UPDATED

InternationalCoastalManagement

OFFICE 50G 1 MacArthur Parade, Main Beach, 4217, QLD, AustraliaPOST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, AustraliaTELEPHONE +61 7 55640564 FAX +61 7 55329147WEBSITE www.coastalmanagement.com.au

Belongil Seawall Repairs

28, 28A CHILDE STREET AND 8 THE ESPLANADE

(Lots 32, 33, 34, 35 and 36 in Section 2 of DP1623)

DRAWING REGISTER

21.04.2017

BSR - CS3 - 001 B COVER PAGE

BSR - CS3 - 002 B PLAN VIEW (PRESENT)

BSR - CS3 - 003 B X-SECTION A (PRESENT)

BSR - CS3 - 004 B REPAIR WORKS A

BSR - CS3 - 005 B X-SECTION B(PRESENT)

BSR - CS3 - 006 B REPAIR WORKS B

BSR - CS3 - 007 B CONSTRUCTION PLAN

BSR - CS3 - 008 B CONSTRUCTION NOTES

BSR - CS3 - 009 CANTY SURVEY 2016

BSR - CS3 - 010 TRAFFIC CONTROL PLAN

SITE LOCATION

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REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876

VERTICAL DATUM: HORIZONTAL DATUM:

21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 002

BELONGIL SEAWALL REPAIRS

B

A 23/02/17 Updated Drawing SK AJ AJ

B 19/04/17 Expanded to include Manfred St SK AJ AJ

- - - - - -

- - - - - -

- - - - - -

- --

- - -

PLAN VIEW (PRESENT)

AHD -

SITE PLAN

Approximate Property Boundary

X-Section

Stair Access

EXISTING STEPS

(TO BE REPAIRED)

EXISTING PUBLIC WALKWAY

(TO BE REPAIRED)


(TO BE REPAIRED)

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X

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1. Survey Plan 28/10/16 - See Drawing 008

EXISTING RETAINING WALL

MANFRED STREET

E

S

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L

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N

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m

0m 10m 20m 30m 40m 50m

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

MHWS

MLWS

MSL

MHWS

MLWS

MSL

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0

Road Reserve Approx. 10m


REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 003


B

A 23/02/17 Added Boundary Line SK AJ AJ

B 20/04/17 Adjusted drawing for road reserve SK AJ AJ

- - - - - -

- - - - - -

- - - - - -

- --

- - -

X-SECTION A (PRESENT)

AHD -

X-SECTION A (PRESENT)

DAMAGED RUBBLE WALL (TO BE REPAIRED)

Present Profile (2016)

Sand Level (13th October 2016)

ROCK FILL

ROCK FILL

ROCK FILL

TOP OF SLOPE

+5.3m AHD

Previous Scour Level

(from Photos)


(TURFED)

Ti-Tree Logs

(from Photos)

VARIOUS ROCK SIZES BEHIND DAMAGED RUBBLE WALL

Typical Profile [approx. 1V:1.5H]

(from historical photos and surveys)

PHOTO (ICM 13/10/16)

AERIAL PHOTO JUNE 2016 (Source: WRL)

~ -1.5m AHD

APPROX. BOUNDARY LINE

1. Grey shaded area shows estimated

location of rocks based on wall slump

and volume displacement

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

MHWS

MLWS

MSL

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0


REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 004


B

A 23/02/17 Amended Annotations SK AJ AJ

B 20/04/17Adjusted drawing for road reserve

SK AJ AJ

- - - - - -

- - - - - -

- - - - - -

- --

- - -

REPAIR WORKS A

AHD -

TYPICAL REPAIR PROFILE A

REPAIR PRIMARY ARMOUR LAYER TO 1:1.5 SLOPE

(TYPICALLY 0.5-2.5t BOULDERS OR EQUIVALENT)

REPAIR SECONDARY ARMOUR LAYER

(100 to 500kg Rock) AS REQUIRED


REPAIR FILTER LAYER

1.5

1

TOP OF WALL +5.0m AHD (MIN)

TOP OF SLOPE +5.3m AHD


Top of

Ti-tree logs to

remain in place for

initial repair works

(See note 2.)

EXISTING PUBLIC WALKWAY REPAIRED

(TURFED)

PRESENT DAMAGED PROFILE (2016)

ROCK FILL


1. Repairs to be in accordance with Supreme

Court of NSW Consent Orders 2010/426976

Dated 12/08/16

2. Council consent to be obtained for works

within Road Reserve. No works to be

undertaken seaward of the road reserve

without approval from NSW State

Government.

3. Vegetation to be maintained as far as

possible.

Slumped rock from beach margin

to remain in place for initial repair works

(see note 2.)

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

MHWS

MLWS

MSL

MHWS

MLWS

MSL

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0



REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 005


B


B 20/04/17

Adjusted drawing for road reserve

SK AJ AJ

- - - - - -

- - - - - -

- - - - - -

- --

- - -

X-SECTION B (PRESENT)

AHD -

X-SECTION B (PRESENT)

DAMAGED RUBBLE WALL (TO BE REPAIRED)



TOP OF SLOPE

+5.3m AHD

Previous Scour Level

(from Photos)

Ti-tree Logs

(from photos)

ROCK FILL

ROCK FILL

ROCK FILL


(TURFED)

VARIOUS ROCK SIZES BEHIND DAMAGED RUBBLE WALL

Typical profile [approx 1V:1.5H]

(from historical photos and surveys)

PHOTO (ICM 13/10/16)

AERIAL PHOTO JUNE 2016 (Source: WRL)

~ -1.5m AHD

AP

PR

OX

. B

OU

ND

AR

Y L

IN

E


1. Grey shaded area shows estimated

location of rocks based on wall slump

and volume displacement

-2.0m AHD

-1.0m AHD

0.0m AHD

1.0m AHD

2.0m AHD

3.0m AHD

4.0m AHD

5.0m AHD

6.0m AHD

7.0m AHD

MHWS

MLWS

MSL

0.0m 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0


REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 006


B


B 20/04/17 Adjusted drawing for road reserve SK AJ AJ

- - - - - -

- - - - - -

- - - - - -

- --

- - -

REPAIR WORKS B

AHD -

TYPICAL REPAIR PROFILE B

REPAIR PRIMARY ARMOUR LAYER TO 1:1.5 SLOPE

(TYPICALLY 0.5-2.5t BOULDERS OR EQUIVALENT)

REPAIR SECONDARY ARMOUR LAYER

(100 to 500kg Rock) AS REQUIRED


ROCK FILL

ROCK FILL

ROCK FILL

REPAIR FILTER LAYER

1.5

1

TOP OF WALL +5.0m AHD (MIN)

TOP OF SLOPE +5.3m AHD


PRESENT DAMAGED PROFILE (2016)

Top of

Ti-tree Logs to

remain in place

for initial repair works

(see note 2.)

EXISTING PUBLIC WALKWAY REPAIRED

(TURFED)

AP

PR

OX

. B

OU

ND

AR

Y L

IN

E


1. Repairs to be in accordance with Supreme

Court of NSW Consent Orders 2010/426976

Dated 12/08/16

2. Council consent to be obtained for works

within Road Reserve. No works to be

undertaken seaward of the road reserve

without approval from NSW State

Government.

3. Vegetation to be maintained as far as

possible.

Slumped rock from beach margin

to remain in place for initial repair works

(see note 2.)

A

P

P

R

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REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 007


B

A 23/02/17 Updated Annotations SK AJ AJ

B 20/04/17 Expanded to include Manfred Street SK AJ AJ

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- - -

CONSTRUCTION PLAN

AHD -

CONSTRUCTION PLAN

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1. Construction access to be from Manfred Street,

or approved alternate.

Refer to traffic control plan; drawing

BSR-CS3-010

Construction access to be adequately fenced

Safe pedestrian access along Manfred Street

and to existing beach access to be provided.

2.Smooth transition (tie in) of crest and toe to

adjacent walls (Typical)

3. Vegetation to be maintained as far as possible.

Safety Fence

Approximate Property Boundary

Construction Vehicle Access

Safe Pedestrian Access

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TIE IN

See Note 2.

TIE IN

See Note 2.

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Provide safe vehicle and pedestrian access

(See TCP BSR-CS3-010)

Retain existing pedestrian beach access - See note 1

Construction vehicle acess

Rock stock pile

To Childe Street

(For traffic control plan,

see BSR-CS3-010)

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REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 008


B

A 15/03/17 Ameneded Construction Notes SK AJ AJ

B 21/04/17 Amended Construction Notes SK AJ AJ

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CONSTRUCTION NOTES

AHD -

REPAIR CONSTRUCTION METHOD STATEMENTWorks to repair the seawall structures are to be carried out as anticipated by the recent Supreme Court of NSW

consent orders made 12/8/16. The proposed method of carrying out the works is as follows:

Pre-Construction

o All approvals and notifications to be in place.

o Safety fencing and signage is to erected as per drawing 007 to restrict public access to the work and

access areas.

o Temporary construction access from either the sealed section of Manfred Street over the

existing rock wall or, alternatively, the sealed section of Don Street along the southern boundary of 1 Don Street

over the existing SFGC wall (covered with 1200gsm non-woven geotextile) onto the beach.

Construction (5 days per week, 7am to 6pm. Estimated repair time 2 week)

o Access onto the fenced works area for equipment and materials will be by temporary construction track.

o The works shall be carried out in 10 -15m sections starting from the NW end.

o Loose rocks above about -1m AHD that have been displaced from the wall face onto the beach to

seaward of the wall will be restacked to the original stable slope of 1V:1.5H with the repaired crest at +5m

AHD with a 20-30t hydraulic excavator.

o The crest and toe of the works shall be tapered smoothly into the adjacent crest and toe without

interference with the existing structures.

o The existing access to the beach shall be repaired and safe access provided at each end of the works to

provide public access along the top of the wall.

o The wall is to be progressively surveyed and final “as constructed” drawings prepared.

Post-Construction

o The beach is to be groomed and left in a clean condition free from rock or rubble.

o The access track is to be restored to the original condition.

o The safety fencing is to be removed.

Repair Costs

o Preliminary Estimate = $165,000

MITIGATION OF IMPACTS

The works have been designed to avoid adverse impacts. Section 55M of the Coastal Protection Act requires that:

(a) the works will not over the life of the works:

(i) unreasonably limit or be likely to unreasonably limit public access to or the use of a beach or headland, or

(ii) pose or be likely to pose a threat to public safety, and

(b) satisfactory arrangements have been made (by conditions imposed on the consent) for the following for the life of the

works:

(i) the restoration of a beach, or land adjacent to the beach, if any increased erosion of the beach or adjacent land is

caused by the presence of the works,

(ii) the maintenance of the works.

With reference to the above conditions:

Re (a) (i);

The proposed works are to make safe existing works by restacking of the wall to restore a stable slope without loose

rocks that could be easily dislodged during erosion events.

The proposed works will make public access safer by moving dislodged rock from the base of the existing wall and

replacing these on the repaired slope.

The completed repair works will improve public access along the beach.

Re(a) (ii);

The proposed repair works will improve public safety by restacking loose rock. Thus, the repair works will not “pose a

threat to public safety”.

Re (b) (i);

The proposed repair works will restore a stable slope. Large loose rocks at the toe will be moved landward onto the

steeper mid and upper slope of the wall. The footprint of the repaired wall will be smaller and will not extend as far

seaward. The repaired wall face will also be less reflective during erosion events. As a result, any impacts on the

beach and adjacent land will be the same, or less, than at present. Thus, the repairs will not cause “any increased

erosion of the beach or adjacent land”.

Re (b) (ii);

The proposed repair works can and should be maintained by the landowners after each erosion event that impacts thewall.

REPAIR DESIGNTo determine the extent of repair works:

An inspection of the walls covered under the consent orders was carried out by ICM engineers on 13/10/16 to

ascertain the present condition.

Historical photos and surveys held by ICM were reviewed to ascertain the previous condition.

REV.NO.

PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

LEGEND

LOCALITY PLAN

REVISION:

NOTES



RPEQ 2876


21 Apr, 2017

SK AJ AJ

A3 A3

BSR - CS3 - 009


-

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CANTY SURVEY 2016

AHD -

1. 2016 Canty Survey Details

Plan of Detail Survey Lots 34 & 35, Section 2

DP1623, Childe Street, Byron Bay, Shire of Byron,

Parish of Byron, County Rous

Canty's Surveyors ABN 49 093 101 305

Datum - AHD

Survey Date - 28th October 2016

Reference - 0210/2

Drawn By. - Cameron Barnett

Checked By. - Scott Thompson

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PROJECT NAME

DRAWING TITLE

DRAWN :

SIZE:

DRAWING No.

CHECKED :

SCALE :

APPROVED :

DATE :

DESCRIPTION

DATE

REVISION REGISTER

BY ENG.APP.

REVISION:


OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, AustraliaPOST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, AustraliaTELEPHONE +61 7 55640564 FAX +61 7 55329147WEBSITE www.coastalmanagement.com.au

RPEQ 2876


21 Apr, 2017

NOTES

SK AJ AJ

A3 A3

BSR - CS3 - 010

28, 28A CHILDE STREET AND 8 THE ESPLANADE

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- - -

TRAFFIC CONTROL PLAN

- -

1. Work hours; 7am - 6pm Monday to Friday excepting

public holidays

2. Construction Time; Approx 10 working days.

3. Truck volumes; It is estimated that 60 trucks @ 12t/truck

over the 10 days will be required.

4. Traffic Control and Signage; All traffic control and

signage is to comply with Roads & Maritime Services

Guide to Traffic Control at Worksites Manual. All signage

is to be removed when works are not in progress and are

to be removed immediately following the completion of

works.

Sign distances may be shortened to 25m so not to

be obscured by vegetation if necessary.

Traffic controller to hold North bound traffic for truck

to reverse into sight

Contractor to provide a spotter for vehicles and

pedestrians in Manfred St.

5. Road Hazards; Trucking operations to be implemented in

a safe manner so as to not cause a hazard for motorists

or pedestrians.

6. Covering of Loads; All loads are to be covered with taut

heavy duty purpose fitted tarpaulins to ensure no loss of

load or dust.

7. Mud; Contractor to ensure that the wheels, tracks and

body surfaces of all vehicles and plant leaving the site

are free of mud and that mud is not carried on to adjaced

paved streets or other areas.

Temporary Access

to Beach

Wall to be

repaired

TRAFFIC CONTROL PLAN

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11

ATTACHMENT B EMP PROFORMA

repairs to seawall at 28 & 28a childe st, belongil

Documents