PART Response to Information Request · OPW11/0335

1.0        INTRODUCTION

Simmonds and Bristow have been commissioned by Contrast Constructions and the Scanlon
Property Group Pty Ltd to develop a Stormwater Management Plan (SWMP) and Sediment &
Erosion Control Plan (SECP) for their re-development of the Peregian Caravan Park as the
Essence of Peregian.

The plans describe two development phases; the construction phase when building activity
disturbs the ground surface, which is described by the SECP, and the maintenance phase when
the development is fully built and operational is described by the SWMP. In addition, the
development will be constructed in three construction stages, with the stormwater infrastructure
being installed in two stages. A portion installed at 'Stage 1' to reflect the reduced development
installed at that stage, with the remainder of the stormwater management infrastructure installed
during stage 2 construction (for stages 2 and 3).

The intent of the plans is to protect the environmental values of receiving waters by minimising
the hydraulic disturbance and the load of contaminants in run-off from the development site.

The SECP develops an erosion hazard and risk assessment based on the soil and topography
of the development site. This plan identifies the environmental values of the receiving water
body, and any potential consequences that erosion of the development site might have on the
receiving water body. The SECP includes information on how to manage the erosion and off-
site export of soil from the development site, and a statement of the personnel responsible for
establishing and maintaining all erosion and sediment control measures.

The SWMP describes a treatment train design to manage stormwater from the site, which
includes overland flow across the site from upslope sources.        The SWMP is based on
assessments and MUSIC computer modelling of likely changes to annual stormwater sediment
and nutrient loads from the proposed development. The plan also provides information on
managing the stormwater treatment train, and a statement of the personnel responsible for this
management.

The plans are prepared in accordance with the Queensland Best Practice Environmental
Management Guidelines 2009. References were also made to other guidelines:

          • Introductory Erosion and Sediment Control Guidelines for Queensland Councils;
          • IECA Best Practice Sediment and Erosion Control;
          • Erosion & Sediment Control: A decade of lessons learnt; and
          • Controlling stormwater pollution on your building site.

This report directly follows from the conceptual SWMP and SECP report (J-0906-226: Essence
of Peregian: Stormwater Management Plan; Sediment and Erosion Control Plan).           The
conceptual SWP was modified by removing some of the process units from the stormwater
treatment train as follows:

          • Converting swales to hydraulic conduits and changing roof areas;
          • Vegetation in the bio-retention trenches changed from wetland plants to grass;
          • Consolidation of Northern and Mid section bio-retention trenches
          • Adjusting the size of the Constructed Wetlands.

The outcome was that suitable water quality could still be achieved with the modified treatment
system.




02012 Simmonds & Bristow Pty Ltd                         Contrast Constructions                          J-1005-310 - 13 January 2012
I\CLIENTFILES\Contrast Constructions\1108-155c - Essence of Peregian SCEP Stage 1 Update 09_Output Documents\1108-155C_SWMP
SCEMP_Scanlon Property Group_V3.0_ta_120113.doc                                                                           Page 1 of 24