2008/0169 Response to information request - 71 Seaview Tce Sunshine Beach · 132008.169

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                                               Table 1 - Cali   ated Soil Loss


                        RUSLE Parameter                              Value / Rating


                        Rainfall Erosivity                           ^ "- 1

                        Slope Gradient                               Approaching 30%
                        Potential Erosion Hazard                     Very High
                        Rainfall Zone                                Zone A
                        Soil Erodibility Factor K                    0.075
                        Soil Texture Group                           Type C
                        Total Site Area                              0.99 Ha

                        Disturbed Site Area                          0.35 Ha
                        801h %ile, 5-day rainfall event              46.3 mm
                        Calculated Soil Loss (RUSLE)                 1493.2 t/ha/yr
                        Soil Loss (disturbed site area)              522 t/ha/yr



2.3   EXPANSIVE OR REACTIVE SOILS

Shrinking and swelling of unsaturated expansive clays in response to water content changes is one the most
common geotechnical causes of damage to residential buildings. Rainfall, evaporation, leaking pipes, groundwater
seepage and tree roots may cause soils to shrink or swell. Due to the subject sites close proximity to the ocean
(within 200m), the local soil type is almost entirely coarse sand. As such the presence of expansive clays and silts
within the site is highly unlikely; however any soils prone to shrinkage or swelling must be identified.

2.4   ACID SULPHATE SOILS

Levels throughout the site range from 51m AHD at the western boundary to 25m AHD at the proposed extent of
works to the east. Acid Sulphate Soils (ASS) within the Sunshine Coast Region is usually confined to areas below
Sm AHD. No site specific measures are required for ASS.


2.5   SOIL pH

Changes to the natural pH levels in the local soils can have adverse impacts to surrounding vegetation and
buildings. The pH of soils can be artificially altered for site specific reasons. The acidity or alkalinity of site soils
must be considered during the construction phase of the development. Site works are to be monitored and
supervised to address any issues relating to alterations of site pH levels

2.6   WATER TABLE

Increased infiltration as a result of reduced vegetation cover may cause fluctuations or changes to the water
table. Deep excavations below the local water table can lead to ground water seepage and cause various
environmental and construction problems. Suitable measures including pumping will be required where seepage
occurs and the water table is encountered.




 SOIL AND WATER MANAGEMENT PLAN - Revision A                                       71 Seaview Terrace. Sun^hme Reach        2