PART Response to Information Request · OPW11/0335

11.0        MONITORING AND EVALUATION OF WATER QUALITY AGAINST TARGETS

A draft water quality monitoring program has been developed to measure the performance of
the proposed stormwater treatment. The objective of the monitoring program is to quantitatively
show whether or not the nominated water quality targets are being met.

The key water quality indicators are total suspended solids, total nitrogen, total phosphorus and
pH.    Other relevant water quality parameters include microbiological parameters (faecal
coliforms, Escherichia coli), chemical and physical parameters (dissolved oxygen, turbidity), and
herbicides if they are used within the development site. The following water quality indicators
are recommended (Table 11-1):

       •      Microbiological: Faecal coliforms, Escherichia coli
       •      Physical: Biological Oxygen demand, dissolved oxygen, suspended solids, turbidity,
              pH;
       •      Chemical: Total suspended solids, total nitrogen, total phosphorus; and
       •      Herbicides: If herbicides are used to control weeds on the development site, then
              they should be included in the suite of water quality indicators.

                       Table 11-1: Summary of Test Methods for Ambient Surface Waters
                                                 Sample Preparation
              Parameter                                                                      Sample Analysis Method
                                                      Method
                                                  Heated persulphate
  Nutrients - total                                                                        SEAL AQ2 discrete analyser
                                                      digestion
  E coli                                          Membrane filtration                     EC Broth or EC-MUG medium
  Faecal coliforms                                Membrane filtration                                  M-FC Agar
                                                                                        Membrane electrode in Wheaton
  BOD5                                                   Incubation
                                                                                                   Bottles
  Suspended solids                                Membrane filtration                                  Gravimetric
  Dissolved oxygen                                          None                                Membrane electrode
  pH                                                        None                                Membrane electrode
  Turbidity                                                 None                                       Photometer
LHerbicides                                        Solvent extraction                                   #GC/MS
#GCMS - Gas Chromotograph/Mass Spectrometer


The existing spatial variation of key water quality indicators in the wetland adjacent to the
Noosa National Park, measured on the 10th July 2009 after a stormwater flow, was used to
identify the replication needed to represent water quality in the Constructed Wetland System
and the receiving node.

It is recommended that the water quality of the terminal wetland is represented by 9 sampling
points per sampling event (i.e. 9 spatial replicates): six from the Constructed Wetland System
and 3 more from the heath on the west of the terminal wetland (adjacent to Noosa National
Park). This sampling frequency will accommodate the spatial variation of water quality
measurements expected in the Constructed Wetland System, and in the heath that connects
with Noosa National Park, and will quantitatively show the difference between the average
measured concentrations in the Constructed Wetland System and the receiving waters,
compared with the required target or guideline values.

The recommended sample points are indicated in Table 11-2, which lists the location of sample
points during the construction phase and the operational phase.



©2012 Simmonds & Bristow Pty Ltd                         Contrast Constructions                           J-1005-310 - 13 January 2012
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SCEMP_Scanlon Property Group V3.0_ta_120113.doc                                                                           Page 18 of 24