OPW 15-0099 RFI Response combined scan

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b) The dimensions of the temporary diversion channels are tabled on Calibre drawing 15-001261-113 with the
existing gully (traversing stage 2) being protected from sediment by diversion drains, sediment fences and
existing vegetation retained until the last phase of the bulk earthworks operation.

c) Diversion drain lining has been detailed on Calibre drawing 15-001261-113, with geofabric pinned to the invert

and batters of the diversion drains.

d) Condition 68 of the higher order approval states:

The development must not adversely impact on the existing drainage conditions on other properties
including not depriving dams on other properties of their natural stormwater runoff.

The temporary drainage designs, and in particular the temporary sediment basins, will not adversely impact the
supply of water to downstream dams. In accordance with the Sunshine Coast Regional Council Manual for
erosion and Sediment Control Version 1.2, the basins will be flocculated with the clean water discharged

downstream at the legal point of discharge.

e) Calculations for each of the 5 basins sizing has been attached. The design sizing has been undertaken in
accordance with IECA guidelines (2008) to achieve the requirements of the State Planning Policy Appendix 3,

Table A.

We trust that this information request response is satisfactory to enable Noosa Council to issue an operational works
approval. If you have any further queries please contact the undersigned.

Yours faithfully
Calibre Consulting

TAT ee

Robert Blake
Principal Engineer

ATTACHMENTS

1. Attachment 1 Amended Erosion and sediment control drawings:

a. 15-001261-110 Issue A
b. 15-001261-111 Issue A
c. 15-001261-112 Issue A
d.  15-001261-113 Issue A
e. 15-001261-114 Issue A
2. Attachment 2 Sediment Basins sizing calculations (5 pages)

COPIES
1. Copied to: Palm Lake P/L (Noel O'Brien)

Wat

Andrew McPhail
Principal Engineer
RPEQ. # 6921