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5. Attachment D - Stormwater Response
Attached to the e-mail Response to Information Request - MCU16/0084 & OPW16/0157.
23 September, 2016
Our File Ref: B16239CL002
Contact: Kym Huddart
Urbis
Level 7, 123 Albert Street
BRISBANE, QLD 4000
Attention: Cameron Stanley
RE: PROPOSED NOOSA ENERGY CENTRE
140-142 EUMUNDI NOOSA ROAD, NOOSAVILLE
RESPONSE TO INFORMATION REQUEST
In response to the Noosa Council Information Request dated 16 August 2016, please
find following Lambert & Rehbein’s responses to Hydrology Items No. 4 to 9. Revised
Civil Engineering plans have been included to support this response.
Item 4
Issue
The Stormwater Management Plan Noosa Energy Centre – 140-142 Eumundi Noosa
Road, Noosaville For Denmac Nominees Pty Ltd Dated 14 July (Doc Ref:B16239CR002)
specifies for an above ground detention tank to be provided with three slow release
orifice pipes to control outflow. The Plans provided only show a schematic underground
tank with no orifices that match with the Stormwater Management Plan.
Information Required
Provide updated design plans that are consistent with the The Stormwater
Management Plan Noosa Energy Centre – 140-142 Eumundi Noosa Road,
Noosaville For Denmac Nominees Pty Ltd Dated 14 July (Doc Ref: B16239CR002)
or any relevant updated to that document as a result if this information request.
Lambert & Rehbein Response
Refer to details provided on Drawing B16239-CSK02 which illustrate the slow release
orifice arrangement located on an internal weir within the detention tank to control the
outflow. This arrangement is as per the Stormwater Management Plan.
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23 September, 2016 -2- Our File Ref: B16239CL002 Contact: Kym Huddart Item 5 Issue The plans propose for the detention tank to be buried beneath the shop. It is unclear how the tank will be able to be accessed for repair or maintenance if needed. Information Required Demonstrate how the detention tank will be able to be accessed for maintenance or repair purposes. Lambert & Rehbein Response Access to the detention tank will be provided at the rear of the proposed buildings. Stormwater360 were contacted to confirm the vertical clearance requirements for access/maintenance to the cartridge filters located within the detention tank. As advised by SW360 a minimum 2.2m vertical clearance is to be provided for maintenance purposes such as filter cartridge replacement. Refer to Drawing B16239-CSK03 for sections demonstrating this clearance is achieved. Item 6 Issue It is unclear from the provided drawings whether the Stormwater 360 will be sitting within the detention tank, and whether submersion of the outlet will affect the performance of the Stormwater 360. Information Required Demonstrate how the efficiency of the Stormwater 360 will not be inhibited by its submersion within the detention tank. Lambert & Rehbein Response The StormFilter cartridges are located within the detention tank as shown on Lambert & Rehbein’s plans B16239-CSK02. The majority of stormwater pollutants are typically in the “first flush”. The StormFilter cartridges are located at the inlet to the detention tank within the treatment chamber created by an internal 920mm high wall. Incoming flows will build up behind the 920mm high inner wall, creating the necessary head to drive the passive filtration cartridge. Treated stormwater water is discharged from the treatment chamber to the main detention tank via pipes contained within a false floor under the filter cartridges. Higher flows overtop this inner wall and fill the detention storage component of the tank. The cartridges will continue to operate when the tank is filled above the inner wall height. The cartridges also provide treatment for low flows.
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23 September, 2016 -3- Our File Ref: B16239CL002 Contact: Kym Huddart Item 7 Issue Specific Outcome O9 of the Water Sensitive Design Code requires that runoff from the site is treated through natural treatment strategies. It is noted that the proposal is for all runoff to either be treated via a non-natural device or enter the receiving stormwater network directly. The Water by Design Deemed to Comply Solutions applies to this site and provides that a bio retention basin with filter media area of 2.2% of the catchment area (i.e. 53m²) will achieve the water quality reduction targets. Treatment via this method will facilitate compliance with Specific Outcome O9 of the Water Sensitive Design Code. In addition ongoing maintenance of the water quality treatment device will be responsibility of the property owner. Given the underground nature of the proprietary stormwater quality treatment device, a condition requiring for the applicant to enter into a contract for ongoing maintenance of the device will be needed. Information Required Where it is demonstrated it is not feasible for all runoff to be treated via natural treatment strategies, provide a letter signed by the applicant acknowledging the ongoing maintenance responsibilities and costs for a proprietary device compared to a natural treatment option. Lambert & Rehbein Response In regards to providing a natural stormwater treatment strategy, the proposed landscaping at the rear of the site is allocated for retaining the existing trees. The remaining landscaping locations at the entrance from Eumundi Noosa Road would not provide the area required for bioretention treatment. In addition, in this instance it is considered impractical to direct surface and piped roof runoff to separate landscaped areas for treatment. It is proposed provide stormwater quality treatment via Stormwater 360 Enviropods (gully pit filter baskets) and Stormwater 360 StormFilters (filter cartridges located within the detention tank) to meet the water quality objectives for the site. A letter signed by the applicant acknowledging this treatment train method and the ongoing maintenance will be provided separately.
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23 September, 2016 -4- Our File Ref: B16239CL002 Contact: Kym Huddart Item 8 Issue – Acid Sulphate Soils Excavations are proposed below the elevation of 5m AHD and therefore Acid Sulphate Soils assessment becomes relevant. Information Required Demonstrate how excavations and bedding for pipework below the elevation of 5m AHD will not result in dewatering, or the release of metals via oxidation of Acid Sulphate Soils. Lambert & Rehbein Response Filling and excavation will be carried out in accordance with the Acid Sulphate Soils Management Plan (ASSMP) which will be prepared for the development. We request that the requirement for an ASSMP is conditioned. Item 9 Issue – Water reuse Specific Outcome O3 of the Water Sensitive Design Code requires captured water to be used for all non-potable uses on site. The application does not propose any water capture or reuse. Information Required Review the Stormwater Management Plan to include opportunities for capture and reuse of stormwater. Lambert & Rehbein Response It is proposed to direct roofwater runoff from the Coles Express, Food Shop and Fuel Canopy to an above ground rainwater tank/s located at the rear of the site for non- potable water reuse (e.g. garden irrigation and non-potable water supply at bowser). Overflow will be directed to the StormFilter and detention tank for treatment and flow attenuation prior to leaving site. It is proposed to provide pumps and potable water top up for the tank/s. The size of the rainwater tanks will be based on the anticipated roof water capture and reuse requirements. These details can be provided at the operational works/plumbing application phase.
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23 September, 2016 -5- Our File Ref: B16239CL002 Contact: Kym Huddart Refer to Lambert & Rehbein plans B16239-CSK01 to CSK03 for further information. This completes the response to Items No. 4 to 9 of the Request for Information. Should you have any queries, please do not hesitate to contact the undersigned. Yours faithfully For and on behalf of LAMBERT & REHBEIN (SEQ) PTY LTD K.HUDDART BE(Civil), MIEAust, CPEng, RPEQ SENIOR CIVIL ENGINEER CIVIL URBAN DEVELOPMENT Enc: B16239-CSK01 – CSK03 Revision D
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LAMBERT & REHBEIN
ENGINEERS MANAGERS SCIENTISTS
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ROOFWATER FROM BUILDINGS TO
DISCHARGE TO RAINWATER TANKS
ROOFWATER FROM
FUEL CANOPY TO
DISCHARGE TO
PROPOSED _
PROVIDE MAINTENANCE ACCESS TO PAVEMENT RAINWATER TANK/S 3
BULDING UNDERCROFT. REFER .
ARCHITECTURAL PLANS FOR DETAILS ar
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WHICH HAS BEEN SUPPLIED BY OTHERS. THE DETAILS ARE
PROVIDED FOR INFORMATION ONLY. THE CONTRACTOR SHALL SCALE 1: 100
ASCERTAIN THE POSITION OF ALL UNDERGROUND SERVICES PRIOR .
TO EXCAVATION AND SHALL BE RESPONSIBLE FOR THE COST OF
REPAIRS TO DAMAGES CAUSED AS A RESULT OF THE WORKS.
Associated Consultants: R.P.D. Project: DROPOSED NOOSA ENERGY CENTRE Client:
MAX WATTERSON +ASSOCIATES Lots 2. on RP173876 2 LAMBERT & REHBEIN DENMAC NOMINEES PTY LTD
CONSULTING SURVEYORS & PLANNERS Local Govt: Noosa S.C. 140-142 EUMUNDI NOOSA ROAD,
12 MAPLE STREET PH (07) 54426121 Locality: Noosaville ~\ ENGINEERS * MANAGERS « SCIENTISTS NOOSAVILLE Draftsperson: Checked: Sheet | Drawing No.
PO BOX 639 Emai: [email protected] C 30-08-16 RT RESPONSE TO COUNCIL RFI R.T. K.H. Size
COOROY QLD LEVEL DATUM _ CBD HOUSE TELEPHONE (07) 3250 9000 Title :
A.H.D. Derived B | 14.07.16 | s.c. | FOR DA APPAROVAL LEVEL 3, 120 WICKHAM STREET FACSIMILE (07) 3250 9001 DETAILS Designer: Aporoved: A. PEZZUIT _
Origin: PM107833 FORTITUDE VALLEY QLD 4006 EMAIL [email protected] R.T. 0
RL: 2.730 A {08-07-16 | R.T. | ORIGINAL ISSUE P.O, BOX 112 FORTITUDE VALLEY QLD 4006 * Scal
A.C.N. 010 451 902 comer warn cale:
THIS DESIGN AND DRAWING IS COPYRIGHT. NO PART OF THIS DRAWING MAY BE REPRODUCED, STORED IN A RETRIEVAL Date:
SYSTEM OR TRANSMITTED IN ANY FORM WITHOUT THE WRITTEN PERMISSION OF LAMBERT AND REHBEIN PTY LTD | No. Date By Amendment Checked Ww AS SHOWN . JUN 2016 C