MCU16.0099.01, RAL19.0036 & OPW 19.0282.01 - Response to Information Request (final) 10.03.2020 · MCU16/0099.01

Appendix F
Tree plot survey to identify
tunnel boring impacts
In addition to the Protected Plant Flora Survey, a tree survey was conducted of the area proposed for the
electrical underground route. The aims of this Appendix will be to investigate the likely impact the boring of
the electrical route will have on the standing vegetation. The tunnel boring will be installed 600 mm below the
ground surface will bore at an approximate width of 100 mm. The power route will be under bored east to
west, keeping parallel with the shared property boundary of Lot 47 RP136461 and Lot 46 RP136461, until
reaching a location 10 m from of the approved telecommunications compound.
During the survey conducted on the 24th February 2020, trees were recorded in a 10 m wide plot running
along the proposed underground electrical route (see Figure 5). Only trees with a Diameter at Breast Height
(DBH) of greater that 10 cm within this plot were recorded. Species name, DBH and height were recorded for
each tree within the survey plot (see Table F1 for results). Tree protection zone (TPZ) and Structural root
zone (SRZ) were calculated from the DBH using the Australian Standards for Protection of Trees on
development sites (AS4970-2009), where:
TPZ was calculated as:
          TPZ = DBH x 12
          DBH = trunk diameter measured at 1.4m above ground level
As stated in the standards (AS4970-2009), a TPZ should not be less than 2 m nor greater than 15 m.


SRZ was calculated as:
          SRZ radius = (D x 50)0.42 x 0.64
          D = trunk diameter, in m, measured above the root buttress
The SRZ for trees with trunk diameter less than 0.15 m will be 1.5 m


Table F1: Trees recorded during survey plot

 Id       Tree Scientific name           DBH            TPZ         SRZ(m)         <10%                             Encroachment of
                                         (m)            (m)                        Encroachment of                  electrical route
                                                                                   electrical route                 within SRZ
                                                                                   within TPZ
      1   Lophostemon suvelons                0.17        2.04           1.57                              Yes                                Yes
      2   Melaleauca quinquinervia            0.12        2.00           1.50                              Yes                                Yes
      3   Eucalyptus racemosa                 0.41        4.92           2.28                              Yes                                Yes
      4   Lophostemon suvelons                0.27        3.24           1.91                               No                                 No
      5   Acacia maidenii                     0.10        2.00           1.50                               No                                 No
      6   Melaleauca quinquinervia            0.33        3.96           2.08                               No                                 No
      7   Melaleauca quinquinervia            0.30        3.60           2.00                               No                                 No
      8   Acacia maidenii                     0.15        2.00           1.49                               No                                 No
      9   Melaleauca quinquinervia            0.28        3.36           1.94                               No                                 No
   10     Melaleauca quinquinervia            0.25        3.00           1.85                              Yes                                Yes
   11     Melaleauca quinquinervia            0.31        3.72           2.02                              Yes                                Yes
   12     Melaleauca quinquinervia            0.35        4.20           2.13                              Yes                                Yes
   13     Melaleauca quinquinervia            0.39        4.68           2.23                              Yes                                Yes

                                 Project number 247473 File Protected Plant Survey Report - Lot 47 on RP136461 Cooroibah_final.docx, Select date Revision 0   5