Development Application Part 2 of 2 Planning report Geotechnical report and plans MCU11/0168 & OPW11/0257

    GeoConsulting, Report #15988, July 11                                                                        Page 4
    Lot 34 Marcus Dues Court, Marcus Beach


            3.2.4     Crossfall
    The general crossfall is approximately 1:10 [V:H) with a relative fall of 2.5 metres over the defined building
    area. The direction of fall is to the northeast or road frontage. Contours are waning adjacent the road
    frontage. The allotment frontage is represented by a 0.9/1.4 metre high rendered cobble retaining wall.


            3.2.5     Drainage
    Drainage over the allotment is very good and to the northeast. The estate has an established drainage
    network.


            3.2.6     Soil Investigation
    To investigate sub-soil details, three boreholes (90mm diameter) were advanced, using a small vehicle
    mounted rotary drilling rig.       To augment the boreholes and establish soil strengths, six dynamic cone
    penetrometer (DCP) tests were advanced. Detailed borelog information is presented in APPENDIX A, with
    test locations shown on PLATE 1.


    All boreholes encountered a homogeneous soil profile that consisted of fine dune sands.


            3.2.7      Groundwater
    Groundwater was not encountered in any of the boreholes. Boreholes were extended to 4.5 metres depth.


            3.2.8      Wind Category
    In accordance with AS 4055, the wind category has been assessed as N3 (TC2.5, Ti, PS).


            3.2.9      Engineering Parameters
    The calculated bearing capacity with respect to depth at each of the test locations are presented in the
    tables below.
                                            Table 1 Bearing Capacities at DCP1

                                                                                                               Bearing
        Depth
                            N                                     C"                  t '               Ni     Capacity
          (m)
                                                                                                                (k Pa)
          1.0                3                17.0               1.60                 25°               4.8      40

          1.5                4               25.5                1.46                 33°               5.8      70

          2.0                6               34.0                1.36                 36°               8.2      90

          2.5               10               42.5                1.29                 41 °              12.9     150


t         3.0               14               51.0                1.23                 44°               17.2     200




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