Appendix D - Engineering Report & Plans

       Refer to Appendix B for preliminary infrastructure plans which identify
       proposed road cross sections and layouts.

       4.1     Sight Stopping Distance

       A sight stopping distance study was completed for the development. The
       findings show that the southern uphill approach to the proposed driveway
       access is adequate for design speed of 90km/h (sign posted 80km/h plus
       10km/h). The actual stopping site distance for the northern approach which is
       downhill satisfies a design speed of 80km/h with 1.5seconds reaction time. It is
       considered a reaction time of 1.5 seconds to be suitable for this location as there is
       an existing intersection to the south of the proposed development. The existing
       horizontal curve of Black Mountain Range Road at the location of the proposed
       access is approximately 167m which caters for a design speed of 80km/h. We
       note the posted speed is 80km/h, however with the constraints of the existing
       horizontal curve, the available sight distance is adequate. It should be noted the
       access location is an existing driveway.



5.0    STORMWATER MANAGEMENT

       5.1     Stormwater Connection and legal point of discharge

               The existing dwelling utilises rainwater tanks for water supply. Surcharge
               from rainwater tanks sheet flows towards existing stabilised steep
               vegetated gullies.

               The proposed building envelope for lot 2 is clear of lot 1 existing discharge
               locations and will not suffer from nuisance flows.

               Similarly proposed lot 2 will require rainwater tanks for water supply and
               irrigation/reuse. Should the tanks become full or overflow a level
               spreader will see discharge returned to sheet flow toward existing gullies.
               There are no properties downstream that can be impacted by nuisance
               flows.



6.0    SEWERAGE

       The existing property is serviced via an onsite effluent disposal system. It is
       proposed that the new allotment be serviced via similar system. Detail design of
       the system will be undertaken by a suitably qualified consultant at BA.



________________________________________________________________________
A6578/20-Engineering Report/108 Black Mountain Range Road, Black Mountain 3
October 2020   SR/tk
                                      ALTA PROJECTS