RFI - Att 3 - Engineers Response Letter

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       safe by providing a safe sight distance analysis on the intersection. The analysis must be
       prepared by a suitably qualified person (RPEQ – Registered Professional Engineer of
       Queensland).

       In response to Item 18, sight distances are shown on the Amended Engineering Plans in accordance
       with the IPWEAQ Publication Queensland Street, with consideration to operating speeds with
       adjacent corner radii.

Issue – Vehicle Manoeuvring
        The submitted plans do not include sufficient detail on the access driveway, the
        manoeuvring area and access into each proposed garage.

Information Required
      19. Provide additional detail on the access driveway and the manoeuvring area. The detail
      must be prepared by a suitably qualified person (RPEQ – Registered Professional Engineer
      of Queensland) and include, but not be limited to:
      a. a design generally in accordance with RS-049, RS-050 and any associated addendum;
      b. a longitudinal section extending from the centreline of the formation in Coral Tree
      Avenue to driveway adjacent to the garages; and
      c. demonstrate that a B99 vehicle will not bottom out of scrape while entering/exiting the
      driveway.

       20. Provide a Turning Path Plan that demonstrates how the driveway and manoeuvring area
       will function. The plan must be prepared by a suitably qualified person (RPEQ – Registered
       Professional Engineer of Queensland) and include, but not be limited to:Page 5 of 6
       a. demonstrate how a B99 vehicle, beginning and ending at the proposed ‘refuse area’, can
       enter and exit each garage while the proposed visitor carpark is occupied; and
       b. demonstrate how a B99 vehicle can enter and exit the visitor carpark while both garages
       are occupied.

       21. Provide comment from a suitably qualified person discussing what necessary safety
       controls are to be implemented to ensure the sight lines from the road frontage to the
       manoeuvring area remain unobstructed and to remove the potential creation of traffic
       hazards between vehicles entering and exiting the site simultaneously.

       Refer to the Amended Engineering Plans in response to Items 19 and 20 which demonstrate vehicle
       manoeurvring diagrams in the garage apron areas. It is noted that the apron width provided for the
       development exceed the requirements of AS2890.1 figure 5.4.

       In relation to Item 21, the access driveway is located along the northern boundary of the site. It is a
       straight driveway with no curves, structures or landscaping to hinder visibility. As a result sight lines
       are unobstructed to ensure no traffic hazards with respect to vehicles entering and exiting the site
       simultaneously.



                                              Ingeniir Pty Ltd | 221304-RFI-01
               ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
                                                         Page 2 | 4

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       With reference to clause 3.2.2 of AS2890.1, there is no design requirement for this development to
       consider passing vehicles as this becomes a design benchmark where 30 or more movements (in and
       out) are expected within the peak hour, this development would not achieve 30 movements in a day
       so is not considered an appreciable design benchmark or consideration for this development.

Issue – Underground infrastructure
        The submitted documentation indicate that the proposed works is to be constructed in close
        proximity (above and adjacent) to existing Unitywater infrastructure and no relocation point
        to the existing water meter has been proposed. A statement from Unitywater approving the
        locality of the proposed works to their existing infrastructure has not been provided.

Information Required
      22. Provide an additional statement from a Unitywater representative authorising the
      locality of these works and the relocation of the water meter.

       In response to Item 22, the water meter can be upgraded to a trafficable lid by Unitywater private
       works. Build over sewer compliance if required will be documented as part of the building approval,
       the pergola structures previously shown in proximity to the sewer have been subsequently removed
       from the design.

Issue – Lawful point of discharge
        According to Council standards, the maximum discharge flow rate to a Lawful Point of
        Discharge is 25l/s in a 1% AEP event. The submitted documentation indicates that the
        maximum site discharge to each kerb adapter is 14l/s in a 5% AEP event. Council are
        concerned that the discharge flows from each kerb adapter in a 1% AEP event may create a
        worsening of existing drainage conditions and potential traffic hazards.

Information Required
      23. Provide additional detail considering the discharge rate in a 1% AEP event and
      demonstrating that this discharge rate will not create a worsening of conditions or potential
      creation of traffic hazards along Coral Tree Avenue if a 1% AEP event occurred. This detail
      must be prepared by a suitably qualified person (RPEQ – Registered Professional Engineer
      of Queensland). Provide a copy of the confirmation of payment for the Portable Long
      Service Levy (Q- Leave) for the project.

In response to item 23, the site discharge will be effectively non-worsening compared to the existing site
discharge rates. In accordance with IPWEAQ standard drawing RS-081 the site achieves 25L/s per discharge
point for a 5% AEP noting that RS-081 is for roof water kerb adapters and typical eaves gutters having a
design capacity for the 5% AEP event.

Site discharge rates are only expected to have a minor increase on the existing site discharge rates and
provide an improved drainage connection to the formal infrastructure being Coral Tree Avenue as the site
currently does not have any formalised discharge to the street.




                                               Ingeniir Pty Ltd | 221304-RFI-01
                ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
                                                          Page 3 | 4

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The proposed development has a negligible increase in flows of only 2L/s in 1% AEP flows to the kerb so is
not considered capable producing a worsening of flows as there is minimal change to the existing catchment
characteristics.

If you wish to discuss this matter further, please contact Daniel Kenna.

Yours sincerely,



Daniel Kenna
Beng CPEng MIEAust RPEQ 15522 NER 3133685 EC 66121
for and on behalf of Ingeniir Pty Ltd




                                                Ingeniir Pty Ltd | 221304-RFI-01
                 ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
                                                           Page 4 | 4