Engineering - Specialist Information Request Memorandum MCU17/0046

SPECIALIST INFORMATION REQUEST MEMORANDUM

from:	ENGINEERING ASSESSMENT OFFICER

FILE No.:	MCU17/0046 and OPW17/0160	DATE:	29/5/2017

TO:	Lisa Pienaar

FROM:	Mark Lewis

SUBJECT:	APPLICATION FOR Material Change Of Use – APPLICATION NO. MCU17/0046 – PROPERTY NO. 142403 - Lot 598 RP 48112 - 38 Park Cres SUNSHINE BEACH  QLD  4567 FOR Lyndon Bradney Simmons, TGV Pty Ltd TTE

APPLICABLE CODES AND PLANNING SCHEME POLICIES:

Engineering Works Codes
Natural Hazards Overlay Code

INTERNAL ANALYSIS AND COMMENT:

Site Impacts
The development of the site will not have any significant off-site impacts
Include assessment of existing services & potential impacts of the proposed development on services & the surrounding area.]

External Works
The frontage of the site is currently fully developed with kerb and channel. The footpath network is located on the opposite side of Park Crescent and it is not necessary for a pathway in the frontage of the subject site.

Stormwater Disposal
There is no downstream drainage system to connect to. The submitted plans indicate a system of infiltration pits with a final surcharge feature. The surface runoff will discharge into the adjoining “pathway” at the rear. The submitted plans refer to a Stormwater Management Report but the report has not been submitted and there are some concerns with the potential for the infiltration system to destabilise the site. An information request item regarding this and other stormwater issues has been included.
[Where no referral to Hydraulics Unit is made, provide an assessment of this issue following the procedures contained in the applicable Implementation Note.]

Traffic
It is considered that the existing road network has the capacity to cater for the additional traffic movements created by the development.
[Where no referral to Traffic Engineer, provide an assessment of this issue following the procedures contained in the applicable Implementation Note. In particular, likely traffic impacts of the development, location & treatment of access, intersection upgrades, etc, require discussion.]
[Provide an assessment of this issue following the procedures contained in the applicable Implementation Note. An assessment against the relevant planning scheme is necessary. Comment on the need for road connections to other properties & do an assessment against QS or the relevant PSP as appropriate. Assess road hierarchy, carriageway widths, verge widths, speed control, intersection spacing & treatments, on-street visitor parking & turning areas. Conditions to include sufficient detail on construction standards to inform subsequent operational works design.]

Access & Parking
The proposed development includes 2 carspaces for each unit (garage and carport) accessed from a double driveway to each unit. No on-site manoeuvring is provided. The submitted documentation includes a traffic report which supports the proposed access arrangements.

Planner, are we going to support the proposed access?

The submitted architectural plans indicate retaining structures in the road reserve to support the proposed driveways. The retaining structures are not acceptable in the road reserve. An information request item regarding this and other issues has been included.
[Provide an assessment of this issue following the procedures contained in the applicable Implementation Note. An assessment against AS2890 is necessary. Check with Planner that carparking numbers are adequate & that required service vehicles are provided for.]

Steep Land & Geotechnical Issues/Earthworks & Retaining Walls
The site is mapped as being affected by the Landslide Hazard overlay but the applicant has not submitted a geotechnical investigation or recommendations for the specific development.
An information request item has been included. An information request item has been included.

[Include comments on the likely extent of cut & fill (limit any retaining walls or surface changes to 1.0m where possible). In steep land areas, undertake an assessment of geotechnical report submitted with the application]
[Detail assessment of critical issues and provide any additional comments, which are for internal advice and discussion only]

Critical Engineering Issues:
This section provides a discussion of the abovementioned issues for the project manager

Stormwater
Access
Geotechnical

Consultation:
List the other specialists whose advice was sought in the research of your assessment

Planning

INFORMATION REQUEST:

ENGINEERING

Issue
The submitted plans refer to a Stormwater Management Report but the report has not been submitted and there are some concerns with the potential for the infiltration system to destabilise the site.

Information Required
Provide a site specific Stormwater Management Report that is consistent with the recommendations of the associated site specific Geotechnical Report and makes reference to the proposed stormwater management plan.

Issue
The submitted stormwater management plan includes private structures in the road reserve and other structures that require clarification

Information Required
Provide a revised stormwater management plan that locates all private drainage structures (pits and pipes) within the private property. The drainage line connecting to the kerb and channel is excluded from this requirement.
Provide additional detail on how the proposed “charged” line will be maintained
Provide additional detail on the intent of the “gravel scour protection” and how it will function and be maintained
Provide certification form the design engineer that states that the proposed system, if constructed in accordance with the plans, will not create any off-site impacts

Issue
The submitted architectural plans indicate retaining structures in the road reserve to support the proposed driveways while the engineering plans do not indicate any structures. Private retaining structures are not permitted in the road reserve

Information Required
Provide amended plans that do not include private retaining structures in the road reserve and provide additional detail on how the proposed works in the road reserve will smoothly transition to the adjoining frontages

Issue
The proposed access driveways are not in accordance with Council’s standard drawing RS-050 in that the proposed levels do not achieve that minimum 250mm above the invert of the kerb.

Information Required
Provide amended plans that are in accordance with Council’s standard drawings or alternatively demonstrate how the proposed design will ensure that stormwater runoff is contained in the road formation.

Issue
The site is mapped as being affected by the Landslide Hazard overlay but the applicant has not submitted a geotechnical investigation or recommendations for the specific development.

Information Required
Provide a site specific geotechnical report that includes recommendations for the proposed building design and stormwater disposal system. The report must conclude that the development will be stable in the longer term and not affect the stability of the subject site or any adjoining properties and/or lands.

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INFRASTRUCTURE - INFORMATION REQUEST

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