MCU16/0012 Attach B Engineering report & SMP

                                                                                                            ENG
                                               Engineering Report & Stormwater Management Plan
                                       Date:          24/06/2016     Document No.:      15087-ENG-01.Docx

                                        By:               MRS         Revision No.:              C


Council. However discussions with council have indicated that an alternative product may be
used if the alternative product does become approved for use. Based on these discussions it is
assumed that subject to their approval, council may accept a change in the proprietary
product used.

                     d. MUSIC Model Results
Using the MUSIC software the treatment train for the catchment areas was designed to
comply with the water quality objectives (WQO). It was determined that the water quality
objectives for the proposed development where met as shown in the table below:

                                 Pre-       Post-                  Reduction          Complying
  POLLUTANT TYPES
                             Development Development                  (%)             With WQO
 Total Suspended Solids
                                 899               91.1              89.9                 
         (kg/yr)
   Total Phosphorus
                                1.85               0.63               66                  
         (kg/yr)
  Total Nitrogen (kg/yr)         14                7.68              45.5                 
 Litter/gross pollutants
                              101              0              100                         
         (kg/yr)
     Table 5.5:      Stormwater360 Water Quality Treatment Results

As shown by the above results, the proposed stormwater treatment train adopts best practice
stormwater treatment and will achieve the required Water Quality Objectives.

                     e. Stormwater Quantity Management
Noosa Regional Council Policy requires that a development ensure non-worsening of
stormwater flows up to and including Q100 stormwater events. The proposed development
will not have a larger impervious area than the existing developed site and hence will not
require a stormwater detention system to mitigate the effects of any additional runoff.

                     f. Maintenance

    Construction Phase Management Plan
Potential construction phase impacts include the following:
 Sedimentation and erosion
 Management of contaminated soils and materials on the site Construction Material (such
    as cement)

     General
The objective of the Construction Phase Management Plan is to comply with the requirements
of the Queensland Environmental Protection Act 1994 and Environmental Protection (Water)
Policy 2009 so that the environmental values of effected receiving waters are maintained or


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