2021-12-07 Planning & Environment Committee Meeting Agenda - Updated

PLANNING & ENVIRONMENT COMMITTEE MEETING AGENDA                                    7 DECEMBER 2021


Water              Constituent              Original WQ Data to       Proposed             Comment
                                            2004                      Objectives
                                            20,50,80 %iles            20,50,80 %iles
Cooroibah,         TSS                      Mid Estuary               HEV/SD               HEV/SD are an improvement and endorsed.
Tewantin,    and                            Low=4, 8, 14              Low=1, 2, 6,
Weyba              (Low Flow        upper   High= 8, 13, 16           High=1, 3, 5         MD 50th of 12mg/L is higher than 50th %ile of 8 for low flows in
                   limit 6)                                                                2004. However, there is no other data to base the MD
                                                                      MD 50TH=12mg/L       measurement off here. Prefer in MD waters for 12mgL to be
                                                                                           the upper limit. This facilitates easier compliance where there
                                                                                           is a sedimentation incident, without needing to obtain long term
                                                                                           %ile measurements.

Burgess Creek      - Filterable Reactive    Low: 25,25,80 (40th 25)   Low:25               This is a slight exceedance over historic and 2010 limits. It is
                   Phosphorus               High: 25,25,58 (40th      High:25              known the proteaceae vegetation in this area can toxify
                   (20)                     25)                                            themselves if exposed to high phosphorous, and therefore
                                                                                           following the above criteria cannot be supported.
                                                                                           The proposed criteria can only be supported where it is
                                                                                           demonstrated that the contributing catchment has already
                                                                                           installed all reasonable best practice measures or accept the
                                                                                           risk of lower report card ratings where those measures are
                                                                                           available but have not yet been funded.
                   Total Nitrogen           Low:520, 50, 280 (40th    Low: 700             2004 data is based in discharges from a 20th century STP.
                   (500)                    25)                       High: 610            The objectives worsen from 2010 WQO’s and do not meet the
                                            High:396, 830, 1284                            criteria for endorsement.
                                            (30th 598)
                                                                                           Given Burgess Creek flows are primarily driven by the STP,
                                                                                           consideration for the objectives can only be considered where
                                                                                           it is demonstrated that the WQOs for both Low and High flows
                                                                                           reflect the TN concentrations possible from world best practice
                                                                                           STP’s with polishing system. This would properly reflect
                                                                                           Council’s environment policy for application of best practice.
                   Ammonia                  Low:25,25,50              Low: 25              This is a slight exceedance over historic and 2010 limits. These
                   (20)                     High:25, 25, 50 (30th     High: 25             limits are linked to the same comment for Total Nitrogen. The
                                            25)                                            Limits of 25 could only be supported where demonstrated the
                                                                                           world best practice for STPs.
Lake Cooroibah     Total Nitrogen           Low:216, 280, 356         Low:190, 250, 350    Low flow 80th %ile is Improvement of the situation and can be
                   (150, 240, 380)          High:456, 610, 710        High:300, 420, 600   supported. Recommend for 2010 WQO for 20 and 50th %iles to
                                                                                           be maintained.



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