Approved Concept Environment Management Plan OPW11/0116.01

Arborists have advised that the following methodology would be most beneficial and is to be followed as much as
practicable:
e Removal of branches >6” diameter and placement within Noosa Spit and Noosa Woods (above HAT) as fauna
habitat
¢ Heavy trimming of remaining trees, stockpiling and mulching. Mulch to be utilised for rehabilitation along access
track and site perimeter.
e Removal of remainder of tree litter unsuitable for mulching for disposal at an appropriate location ashore.

Removal of trees and mulching to be undertaken by separate, experienced contractors prior to commencement of other
works.

An offset programme has been developed to compensate for the loss of habitat as a result of the works and this is provided
as a separate report.

6.4 Acid Sulphate

Sediment testing was undertaken on 4t and 5 January 2011 by Coffey Geotechnics. The sediment is fine-medium grained
sand with low (<5%) fines content.

While the surface sediments are clean sand suitable for nourishment, acid sulphate soils (both AASS and PASS) were
identified within some of the deeper areas. Below is the table from the Coffey Report.

The dredging for interim navigation and excavation for the construction of the submerged closure does not disturb acid
sulphate soils.

Dredging / excavation for the wall and training wall / groyne at the end of Noosa River Spit does disturb some acid sulphates
below RL-4.75m AHD for sand-filled geotextile container placement. As such, all material dredged / excavated from below
RL-4.5m AHD is to be placed below LAT (i.e. used for filling deeper containers or as backfill adjacent to the toe).

 

| Rock wall construction will not disturb ASS or PASS materials.

 

 

 

 

 

 

 

Component of Works Depth Liming Rates (kg/m*)

Above RL -4.75 metres AHD Nil

Wall’ Groyne Below RL -4.75 metres AHD 8
(S1-S4)

Below RL -5.5 metres AHD 50

around S4 °

Submerged Closure Above RL -6.45 metres AHD Nil

(S5-S7) Below RL -6.45 metres AHD 50
Dredging

Above RL -3.25 metres AHD Nil
(SB - S14)

 

 

 

 

 

Noite. No disturbance is expected for the Submerged Closure area below RL -6 45 metres AHD or within the
Dredging area below RL -3.25 metres AHD