Water Quality Monitoring Report - Noosa Civic - November 2009-2010 - Eenie Creek Rd NOOSAVILLE · 132002.220285

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      2.0 SURFACE WATER QUALITY

      Surface water quality monitoring was undertaken at the following five (5) locations:

          •   SW1 - located along the western drainage line;
          •   SW2 - located along the eastern drainage line;
          •   SW3 - undisturbed reference site in the paperbark wetland;
          •   SW4 - dam downstream of SW 1; and
          •   SW5 - wetland downstream of the eastern and western drainage lines.

      Refer to Drawings DE0923/01, 03 and 04 included in Appendix A for locations of
      monitoring points.

      Surface water quality monitoring was undertaken once only (annually) for pesticides,
      quarterly for chemical and physical parameters, and quarterly during summer months for
      algae, in accordance with the Noosa Civic Operations Stormwater Management Plan
      prepared by URS (Ref: 42605827-R0101C OSWMP) and the Addendum Report
      prepared by BMT WBM (Ref: R.B16337.008.01.OSMP_Addendum.doc). Refer to
      Appendix B for tables of results.

      In-situ testing was undertaken using a calibrated Honba U10 Multi Probe meter.
      Samples collected were forwarded to a NATA accredited laboratory for testing.

      Refer Appendix C for copy of laboratory reports.

              2.1       Physical Parameters

              Objectives for physical parameters are based on:

                    •   Derived values for Noosa Civic determined during the construction phase
                        monitoring (suspended sediment).

                    •   Demonstrating that periodic acidic conditions are being maintained to
                        provide suitable breeding habitat for wallum froglets.

              Correlation between pH levels and organic carbon concentrations (and rainfall
              data) has been undertaken. In order to maintain breeding habitat for the wallum
              froglet, pH levels of <5.5 at least once a year in the paperbark wetland are
              necessary. Levels at the reference site (SW3) were at pH4.2 during the drier
              months of June 2010 and August 2010.

              The median value for suspended solids exceeded Noosa Civic Water Quality
              Objectives (WQOs) at all locations except SW2. It should be noted that
              significant rainfall (93.8mm) was recorded in the week prior to the January 2010
              monitoring event, and that suspended sediment levels at the reference site were
              also higher than the WQOs.

              Refer to Table 131 in Appendix B for summary of results.

              2.2       Chemical Parameters

P_J           Chemical objectives are based on:


t                   •

                    •
                        Noosa Civic derived values (nutrients).

                        Draft Qld EPA (2005) water quality guidelines or ANZECC guidelines as
                        applicable for heavy metals and pesticide concentrations.

      AE0923WQM
      March 2011
      SH/js