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Draft Condition Response CT · REC13/0015

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Callaghan & Toth Consulting Engineers Pty Ltd
ABN No. 45140292324

  
   
 

8/41 Sunshine Beach Road Noosa Junction

 

 

P.O Box 2305 Noosa Heads 4567 Callaghan & Toth
www.callaghanandtoth.com.au Civil. Envi 1 & Hyd lic Engi
Ph: 07 5474 9081 Fax: 07 54749041 iil, Environmenta: yeraulic Engineers
st
13" June 2013 File No: 1225

Sunshine Coast Regional Council
C/- Max Watterson and Associates
Dear Sir/Madam,

RE: REC13/0015. One lot into 4 lots at 55 Lake Macdonald Drive Draft Conditions

We are writing to respond to parts of the Draft Conditions dated 12-06-13, other responses are
provided separately.

Draft Condition 6 and 11

We have provided a proposed re-wording for conditions 1 and 11 as follows.

Driveways

1. A sealed access driveway must be provided from Lake Macdonald Drive to Lots 1-4 and
te-the-prepesed_bieretention-_basin. The works must be generally in accordance with
Drawing No 1225-02 Rev A titled Stage 1 Four Lots Master Civil Layout Plan 1 dated
May 2013 as prepared by Callaghan and Toth. The works must be undertaken in
accordance with an Operational Works approval and must include in particular:

(a) a driveway crossover in accordance with IPWEAQ standard drawing SEQ R- 050

 

HYDRAULICS AND WATER QUALITY

11. The site must be provided with a stormwater drainage system connecting to a lawful
point of discharge. The works must be undertaken in accordance with an Operational
Works approval and the Queensland Urban Drainage Manual), and must include in
particular:

(a) stormwater quantity management devices of a size and location generally in
accordance with those shown in the of the Stormwater Treatment and Water
Quality Management Plan listed in this Decision Notice

(b) collection and discharge* of stormwater to the drainage line, including the
provision of Level 2 interallotment drainage for proposed Lot 1 — 4 with
associated interallotment drainage easements

(c) the use of gravity stormwater drainage and not surcharge pits.

*(Refer to Advisory Note)A stormwater quality treatment system must be provided for the

development. The works must be undertaken in accordance with an Operational Works

approval and the Bioretention Technical Design Guidelines (Water by Design) and must
include in particular:

(a) stormwater quality treatment devices of a size and location generally in
accordance with those shown in Section 4 of the of the Stormwater Treatment
and Water Quality Management Plan listed in this Decision Notice

(b) bioretention devices which:

(i) are designed generally in accordance with IPWEQA Standard Drawing
No. WSUD-001

X:WOBSICT Projects in progress\1225 30 lots lake MacDonald Drive\Correspondence\REC Info request response.doc
Full text of the other 1 page

Page 2

 

(iv) are designed to ensure that flows which exceed the treatment capacity of
the device avoid damaging of the filter media or subjecting the filter
media to excessive sediment loads.

(v) are provided with a free-draining outlet from the sub-soil drainage system

The current Bio-Retention Guidelines (Water By Design, Version 1 October 2012) states that a
coarse sediment forebay is not required for catchments less than 2 Hectares (Table 14 on page
69). The catchment area is 0.372 Ha and therefore a sediment forebay is not required and
should be deleted from Condition 11 as shown above.

It then follows that an access driveway right down to the bio-retention basin to remove sediment
from a forebay is not required when a forebay is not installed. Figure 34 of the Bio-Retention
Guidelines (Water By Design, Version 1 October 2012) sets out access track requirements for a
forebay, however without a forebay these requirements are not applicable and we request that
Condition 1 should be revised as shown above.

Yours faithfully,
Callaghan & Toth

 

A Haynes BE Civil (Hons) RPEQ MIEAust CPEng

Please view www.callaghanandtoth.com.au for all information on our company profile and terms and conditions for services rendered

Cc Alex Mc Williams
Max Watterson

X:WOBSICT Projects in progress\1225 30 lots lake MacDonald Drive\Correspondence\REC Info request response.doc

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