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

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Monitoring was undertaken monthly for physical parameters and biannual for chemical
parameters. Refer to Appendix B for tables of results.

In-situ testing was undertaken using a calibrated Horiba U10 Multi Probe meter, and
Milwaukee SM500 ORP meter. Samples collected were forwarded to a NATA accredited
laboratory for testing.

Refer Appendix C for copy of laboratory reports.

        3.1       Physical Parameters

        The median pH of groundwater at both wells falls within the desired range for
        wallum froglet habitat (i.e. pH below 5.5 at least once annually during prolonged
        dry weather). The pH levels remained relatively stable throughout the monitoring
        period. It should be noted that GW1 had water levels above the ground surface
        levels on several occasions, whilst GW2 was slow to recharge.

        Refer to Table B5 included in Appendix B for summary of results.

        3.2       Chemical Parameters

        Chemical objectives are based on:

              •   Noosa Civic derived values (nutrients).

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

        The Noosa Civic derived value water quality objectives for total nitrogen was
        exceeded during both monitoring events at both ground water wells. Total
        phosphorus was exceeded at GW2 on both occasions; however fell within the
        WQO at GW1 during the June 2010 monitoring event. It should be noted that
        nitrogen also exceeded Noosa Civic WQOs at all surface water monitoring points
        and phosphorus levels were exceeded at SW5 indicating the elevated levels may
        represent natural fluctuations and background levels of the area.

        Dissolved zinc, aluminium and copper exceeded ANZECC guidelines at GW1
        and GW2. All other parameters fell within guidelines. Locally derived values were
        established by BMT WBM (Ref: R.B16337.008.00.NovO8-NovO9.doc) based on
        data collected from SW3 (Wetland reference site) during construction phase
        monitoring. Aluminium and copper levels fall within these WQOs, however zinc
        exceeded these WQOS (0.113mg/L) during the June 2010 sampling event.
        Further monitoring is required to determine if these levels are a result of natural
        fluctuation or external contamination.

        Refer to Table B6 included in Appendix B for summary of results.

        3.3       Faecal Coliforms

        Levels of faecal coliforms were detected at GW1 (38cfu/lOOmL) and GW2
        (320cfu/100mL) during the June 2010 sampling event, however limits for faecal
        coliforms in aquatic ecosystems have not been set by ANZECC. Limits for
        recreational use are set at 150cfu/100mL for primary contact and 1000cfu/100mL
        for secondary contact. As primary and secondary contact do not occur with the
        groundwater we do not consider this to be a health risk. Faecal indicator
        organisms are derived from a range of sources including industrial processes,
        wildlife, domestic animals and sewage effluent. Previous results were
        <10cfu/100mL, therefore we recommend that results from the next round of

AE0923WQM
March 2011
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