Cover Letter - Response to Information Request

Information Required

1. Provide additional detail on the proposed access driveway. The detail must include but not be
   limited to:
   1.1. A plan prepared by a suitably qualified person (Registered Professional Engineer of
        Queensland – RPEQ)
   1.2. A formation that is in accordance with PSP 6 or sufficient detail to demonstrate that the
        proposed formation achieves compliance with The Reconfiguration of a Lot Code –
        Performance Outcome PO21(g)
   1.3. Sufficient detail (levels and certification) to demonstrate that the waterway crossing section
        is suitable for the intended use and achieves compliance with The Reconfiguration of a Lot
        Code – Performance Outcome PO13 and The Flood Hazard Overlay Code – Overall Outcome
        (2)(e), Performance Outcomes PO4, PO5 and PO7

Response

Please refer to the attached engineering advice letter for a response in relation to Items 1.1 and 1.2.

In relation to Item 1.3, the following is submitted:-

The existing waterway crossing to access proposed Lot 2 will remain impassable for short durations
during flood events up to a Probable Maximum Flood. However, it is intended that the future residents
of proposed Lot 2 will ‘shelter in place’ during such events until the waterway crossing is passable
again. This outcome would be compliant with the relevant acceptable outcomes/or performance
outcomes of both the Reconfiguring a Lot Code and the Flood Hazard Overlay Code in that:-

Reconfiguring a Lot Code

    +   AO13.1 – The proposed development will involve upgrading the existing driveway to an
        appropriate sealed standard consistent with Jirrima Crescent of which it takes access from.
        The crossover to Jirrima Cresent will be designed to comply with Standard Drawing RS-056.
    +   AO13.2 – The development does not require access to a state-controlled road.
    +   AO13.3 - A new access and services easement having a width of 10m will be established over
        Lot 1 in favour of Lot 2 in accordance with PSP6.

Flood Hazard Overlay Code

    +   AO4.1 - Allows an ‘or’ option to be achieve where complying with AO4.2.
    +   AO4.2 - Proposed Lot 2 is provided with an area of sufficient size and dimensions on site above
        the PMF that allows for safe congregation and refuge as detailed in the attached flood level
        document prepared by Hydrology and Water Management Consulting.
    +   AO4.3 - Is not applicable as both Jirrima Crescent (southbound) and Lake Cooroibah Road
        (southbound) remain impassable during a 1 AEP Event. The proposed lots would offer a
        greater flood immunity than the existing service roads.
    +   AO5 - The development will not cause any loss to flood storage capacity or result in any
        changes to the hydrological regime.
    +    PO7 - Both lots will provide will provides areas of sufficient size above the PMF that would
        allow for safe congregation and refuge to shelter in place during a flood event in accordance
        with Acceptable Outcome AO4.2.