Appendices 6 SMP, 7 Bushfire & 8 Noise impact - Email 3 of 4 - MCU16/0153 & REC16/0041

                                       STORMWATER MANAGEMENT PLAN
Client: Thomco (No 2087) Pty Ltd                              Location: 215 David Low Way, Peregian Beach



    Table 2 – Site stormwater quality objectives (as per WQO’s for Wallum Tannin-stained Streams)
                           Pollutant                           Water Quality Objectives
           Turbidity                               <20 NTU
           Suspended Solids (SS)                   <6 mg/L (annual mean concentration)
           Chlorophyll a                           <5 µg/L
           Total Nitrogen                          <500 µg/L (annual mean concentration)
           Oxidised N                              <60 µg/L
           Ammonia N                               <20 µg/L
           Organic N                               <420 µg/L
           Total Phosphorus                        <50 µg/L (annual mean concentration)
           Filterable Reactive Phosphorous
                                                   <20 µg/L
           (FRP)
           Dissolved Oxygen (% saturation)         85 – 110 % saturation
           pH                                      5.0 - 7.0
           Secchi Depth                            N/A
           Conductivity                            500 µS/cm
                                                   Aim for no visible oils, petrochemicals, films
           Hydrocarbons
                                                   or odours
           Litter                                  Aim for no anthropogenic material greater
                                                   than 5 mm in any dimension.

3.2 Area of Treatment
The total area of the proposed development is approximately 1.165 ha consisting of groundcover,
roof area and road area. With the topography of the site and the proposed development layout, the
entire site can be treated for water quality purposes.
The treatable area of the site has been divided into three (3) catchments. The three (3) catchments
are discussed further in Section 4.2 and can be seen in the Preliminary Stormwater Management
Layout in Appendix B.


4.0 WATER QUALITY MODELLING ASSESSMENT/APPROACH
4.1 Scenario Methodology
The site was modelled using split catchment source nodes, comprised of roof area, road area and
groundcover nodes.
4.2 Proposed Stormwater Treatment Train
The following mitigation measures are proposed for the overall stormwater management at the site.
Stormwater runoff from the site will be treated by three (3) bioretention basins prior to discharge off
site.




Covey Associates Pty Ltd                               5                                   Project No: 162042
Consulting Engineers                                                                        100949Rpt Issue A