Stormwater Management Plan

                              STORMWATER MANAGEMENT PLAN
Client: Hass Holdings ATF The Quasar Trust                                              Location: Taylor Court, Cooroy


3.1 Water Quality Objectives

The nearest water course to the site is the North Maroochy River and is located within the
Maroochy River Basin Catchment Plan. The Environmental Protection Water Policy 2009 South
East Queensland Map Series (Plan WQ1411) identifies North Maroochy River to be lowland
freshwaters. Table 2 outlines the specific performance criteria required within lowland freshwaters
in the Maroochy River Basin Environmental Values and Water Quality Objectives – Basin No. 141
(part) including all tributaries of the Maroochy River (Department of Environment and Resource
Management, 2010).

                                   Table 2 – Site Stormwater Quality Objectives
                                Pollutant                 Water Quality Objectives
                                                           Lowland Freshwater Values
                           Suspended Solids (SS)   <6 mg/L (annual mean concentration)
                           Total Phosphorus        <50 µg/L (annual mean concentration)
                           Total Nitrogen          <500 µg/L (annual mean concentration)
                           Turbidity               <10 NTU
                                                   Aim for no visible oils, petrochemicals, films
                           Hydrocarbons
                                                   or odours
                           Dissolved Oxygen        85 – 110 % saturation
                           Chlorophyll-a           5 µg/l
                           pH                      6.5 – 8.0
                           Litter                  Aim for no anthropogenic material greater
                                                   than 5 mm in any dimension.


3.2 Area of Treatment

The total area of the site to be treated is approximately of 8243 m2. The site has been modelled as
one (1) catchment. The catchment consists of the north exit point, south entrance and exit road,
car and truck parking, service area and food outlets and the landscaped areas. Refer to the Site
Plan in Appendix A for further details.

3.3 Non-treatment Areas

The southern entry/exit point at the site onto Taylor court is unable to be treated due to the site
topography. This area comprises 673 m2 of the site and is not considered likely to cause adverse
impacts to the surrounding environment due to its small area. This area has been included within
the model as untreated road and untreated landscaping area. Refer to Figure 3 for details on the
untreated area.




Covey Associates Pty Ltd                              3                                             Project No: 161968
Consulting Engineers                                                                                   100415 Rpt Iss A