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24-7-19 Attachment E - MPN consulting Response
MPN CONSULTING PTY LTD (N) () . STRUCTURAL AND CIVIL ENGINEERS consulting Level 5,39 Sherwood Road, Toowong, Qid, 4066 P O Box 328, Toowong, Qld, 4066 Phone 61733354555 Email [email protected] Web ~ www.mpnc.net.au ABN 39.062 191799 File: 7700 18 July 2019 Noosa Shire Council PO Box 141 TEWANTIN QLD 4565 Attention: Lisa Pienaar Dear Lisa Pienaar RE: | OUTSTANDING MATTERS NOTICE 36 & 40 HOFMANN DRIVE - NOOSAVILLE LOT 6 &7 SP 264847 COUNCIL REFERENCE: MCU19/0017 & RAL19/0004 Please find enclosed a response to the Outstanding Matters Notice dated 2 July 2019 from Noosa Shire Council Development Planner Lisa Pienaar for the proposed development at 36 & 40 Hoffmann Drive, Noosaville. STORMWATER Item 28 - PASS and ASS The information response mentions that at the time of the geotechnical investigation, groundwater was located more than 4 metres below surface level. It is unclear from the plans whether this is below the depth that groundwater will need to be permanently lowered to, and therefore unable to determine whether the permanent basement dewatering will impact on PASS. Further to this, there is potential for over liming acidic water to have an impact on the way that the humic acids form in the receiving environment. The humic acid cycle needs to be protected from the buffering over liming could cause. This is critical to give the wallum froglets a competitive breeding advantage. Further Information Required Provide preliminary construction plans to indicate the complete depth of required excavations, and indicate the depth permanent ongoing dewatering is proposed to. Provide further justification for liming of acidic waters (that are not affected by Acid Sulfate Soils) and demonstrate how such activities will not affect the humic acid cycle necessary for the wallum frog breeding advantage.
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18 July 2019 (7 10 M consulting Response The concept bulk earthworks layout and section on MPN Plan DA.03 demonstrates the bulk excavation for the proposed basement will be less than 4m in depth from existing surface level. As no groundwater was observed during the geotechnical investigation, no permanent dewatering measures are anticipated to be required as part of the development. On this basis, the application of lime to the acidic soils as recommended in the Acid Sulfate Soils Investigation will not result in impact to the wallum frogs through dewatering measures. Item 31 & 32 There is inadequate information to assess and verify the validity of the input nodes to the MUSIC model to achieve the stated water quality outcomes. No information was provided to verify what the input parameters to the treatment nodes of the MUSIC model should be and whether they were correct as tested under the SQUIDEP protocol. The extensive information provided does not address: e howthe proposed proprietary devices have been tested against the SQIDEP protocol, e whether the pollutant reduction claims of the proposed proprietary devices relate to sites of comparable size or rainfall patterns to the subject site. Further, the information provided does not demonstrate that the suitably qualified and experienced professional offering verification has a minimum of 10 years urban stormwater testing and modelling experience with examples to demonstrate appropriate reputation and track record within the stormwater industry to provide such independent advice confirming that the devices are tested and verified as per the SQIDEP protocol. Fi formation Required Please provide the information requested within previous information request 31 & 32. Where this information is provided - the person verifying the pollutant reduction capability of the proprietary device must also include the input parameters to be included within the MUSIC treatment nodes. Where this information is unable to be provided - review the stormwater design to instead include a traditional bioretention basin with filter media area sized to 2.2% of the contributing catchment (to meet the Water by Design Deemed to Comply solutions), or provide a music model to verify filter media surface areas that are smaller than the 2.2% catchment size. Response The stormwater design has been updated to include a bioretention basin for stormwater treatment instead of proprietary treatment devices. The updated stormwater design is detailed in the attached Stormwater Management Plan along with the accompanying MUSIC Model. Excellence with Economy in Engineering 2
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18 July 2019 ION consulting Should you require any further information on the above, please do not hesitate to contact the undersigned. Yours faithfully Mhnoltc Matthew Hendle RPEQ 19730 For and on behalf of MPN CONSULTING PTY LTD mbhirr Excellence with Economy in Engineering 3