Attachment 3 - 360 Civil Consulting Response to IR

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Response to Item 7
Skyline Surveyors were able to provide additional survey, spot level information, on some
areas of the neighbouring sites. This information is attached for Council’s record. Please
note that in some locations access was not possible and Skyline obtained as best survey
level information as possible. The survey information indicates the following: -
     Lot CP BUP7701 appears to have a ridge through the middle of the site with the
        western portion of the lot falling to the street and the eastern portion of the lot
        falling to the rear of the site. Possible pond may occur in the north-eastern corner of
        the proposed development site. In order to alleviate this possible ponding a side
        grated pit is proposed in the base level of the retaining wall which will be connected
        to the development site’s internal drainage. This stormwater system is shown on
        amended 360 Civil Consulting Drawing No. 03 (Rev A).
     Lot 6 RP124554 has an internal stormwater pit and overland flow discharges to
        Thomas St via the existing driveway.
     Lot CP BUP7283 is lower than the development site and the survey levels indicate it
        falls towards Thomas St.
     Lot CP BUP6949 appears to be slightly lower than the development site and falls
        towards the street. The north-eastern corner of Lot CP BUP6949 appears to be
        approximately at a similar level to the development site and to address any possible
        ponding that may occur in this corner a side grated pit is proposed in the base level
        of the retaining wall which will be connected to the development site’s internal
        drainage. This stormwater system is shown on amended 360 Civil Consulting
        Drawing No. 03 (Rev A).


Issue
Further information and details are required regarding the existing Council’s stormwater
pipeline within Lot 0 BUP 6971 (No 32 The Cockleshell Street).

Information Required Item 8
Provide further information, details and/or amendments to address the following:
    a) The proposed development requires filling, increases load on the existing drainage
       pipeline on the site and will limit future opportunities for repair and/or upgrade.
       Also, there will be an increase in the flows in the pipeline due to the proposed
       development. As such, it is considered necessary that CCTV investigation of the
       existing pipeline (from The Cockleshell Street to Thomas Street) be carried out by the
       applicant determine the condition of the pipeline and report of investigation
       submitted to Council prior to issuing the OPW approval.
    b) A drainage easement must be created by the applicant over the subject stormwater
       pipeline at a width in compliance with Council’s standards and guidelines. Show the
       required easement on the amended plans.

Response to Item 8
   a) Please find attached to this response a preliminary stormwater CCTV report for the
      existing 375mm stormwater pipe that runs through 32 The Cockleshell, Noosaville.
      The CCTV commenced at The Cockleshell inlet pit and DrainsKleen have advised that

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       "the survey was abandoned - camera travelled downstream about 7m, before
       reaching, root mass which camera could not pass. Attempted reverse survey from
       other end but unable to access pit."

       The report and photos from DrainsKleen of the root mass is attached for council's
       information. Further clarification from DrainsKleen regarding the reverse survey was
       sought and the DrainsKleen operator who was on site has advised that: -

       "I was unable to locate the downstream pit (unsure if downstream pit exists or is just
       cut into another pipe). I am also unable to go from one of the neighbour pits on
       Thomas Street as I can't go around corners with robot camera due to risk of
       damaging equipment."

       Since this survey, Council have advised that, in due course, they will unblock the
       stormwater pipe and that no further work by this development is required in order
       to address this information request item.

       Reviewing the photographs provided in the DrainsKleen report the pipe that is visible
       appears to be in a reasonable condition.

   b) Please refer to the amended 360 Civil Consulting Drawing No. 03 (Rev 3) which
      details the 4m wide drainage easement over the existing council stormwater
      infrastructure.


Issue
Engineering plan/s is/are required for the details of the driveway grades and levels and
including a 2.0m wide pathway to confirm compliance with the relevant standard drawings
and for operational works construction.

Information Required Item 9
Provide an engineering plan and longitudinal cross section for the access driveway/s and
crossovers that include 2.0m wide pathway and demonstrates compliance with IPWEA
Standard Drawings RS-049 and RS-050 and have grades ensure a standard vehicle (B99),
entering or leaving the site will not scrape or bottom down.

Response to Item 9
Please refer to the amended 360 Civil Consulting Drawing No. 11 and 12 which detail a
driveway long section and relevant cross section drawings incorporating the 2m wide
footpath and compliance with IPWEA Drawings RS-049 and RS-050.

End of Responses to Information Request Items 7, 8 and 9.

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I trust that this addresses the engineering issues raised in Council’s Information Request
items 13 and 16. Please do not hesitate to contact me on 0403 862 009 should you have
any queries regarding any of the above matters or the attached drawings.

Yours sincerely,




Beatrice Gibberd
Director and Principal Engineer
360 Civil Consulting Pty Ltd

Attachments:
     Skyline Surveyors Contour and Detail Survey Plan No. 7534Det2
     360 Civil Consulting Drawings 01 to 12 of 12 (Job No. 2017115)
     DrainsKleen Stormwater Pipe Report dated 12/2/18