Engineering Report · MCU18/0094

       The site is elevated several meters above the high bank of Cooroy Creek
       and hence, in the absence of definitive flood level data, it is considered
       very unlikely that the site would be subject to inundation in a 100year ARI
       event.

       Runoff from Garnet Street and Wattle Street roadway verges currently
       traverse the site and represents “nuisance flows” with the nuisance being
       exacerbated once development density is increased. Minor earthworks as
       discussed in the following section are necessary to address such nuisance
       flows.


3.0    BULK EARTHWORKS

       3.1     Cut and Fill and Erosion/Sediment Control

       Minor earthworks are necessary over the site along with a low retaining
       wall (less than 1m maximum height) along the Western and Northern
       boundaries in order to make the site immune to “nuisance flows” and
       allow suitable routing of developed runoff.

       Very minor filling of the Wattle Street verge is necessary to ensure it
       remains free draining post-development.

       Preliminary earthworks drawings and erosion and sediment control plan
       appear at Appendix B.


       3.2     Potential Acid Sulphate Soils (PASS)

       The site lies between RL113m and RL115m AHD and hence an Acid
       Sulphate Soils Management Plan is not warranted.


4.0    SERVICES

       4.1     Water Reticulation

       There is an existing watermain along the Garnet Street frontage.

       4.2     Sewerage

       The site is commanded by a sewer connection point constructed as part of
       the adjacent multiple housing development and located along the site’s
       Western boundary.



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A6265 -18- Engineering Report – Garnet Street, Cooroy                       Page 2 of 4
Mar 2018    SH/tk
                                      Alta Projects P/L