16-001014-02A (Ultimate SCMMP)

                                      Water Quality Control Pond Contingency Plan for Cyanobacterial Blooms
                                                                                                                                                                               Total Cost ($)
      Procedure                      Description                                       Frequency Per Annum             Amount            Unit           Rate ($) / Unit
                                                                                                                                                                               per Annum
      Montoring for Cyanobacterial Blooms
                                                                                       5 Inspections (Quarterly
                                     Routine Inspection for Cyanobacterial                                             2 per
      Quarterly Inspection                                                             or Every Two Months                               hr             $150                   $1,500
                                     Blooms and Algae                                                                  inspection
                                                                                       during Wet Season)
      Routine Maintenance            Routine maintenance for maintaining               As per inspection
                                                                                                                       540               m2             $15                    $8,100
      Measures                       WQCP                                              frequency per annum
      Corrective Actions For Outbreak of Cyanobacterial Blooms
                                     If vegetation failure has caused algae
                                     blooms re‐establish plants (Estimate of           Estimate of Once Per
      Re‐Establish Vegetation                                                                                          540               m2             $20                    $10,800
                                     costs involves full replanting of macrophyte      Annum
                                     planting in WQCP)
                                     Check and maintain upstream stormwater
      Maintain upstream              Bioretention Basins to ensure WQCP                As per inspection
                                                                                                                       485               m2 fm          $121                   $5,820
      treatment devices              inflows have low nutrient concentrations of       frequency per annum
                                     nutrients
      Treat WQCP waters over         Pump ponded water over Bioretention
                                                                                       Estimate 2 week period
      Bioretention Basin or          filter or grass embankment over a 1‐2 week                                        14                day            $1,500                 $21,000
                                                                                       once per annum
      along embankment               period and monitor the impact
      Carbon dose to eliminate       Use carbon dosing to eliminate toxins. Seek
                                                                                       Once in 5 year period           0.2               Provisional    $20,000                $20,000
      toxins                         specialist advice.
                                                                                                                                                       Total Per Annum         $67,220
                                                                                                                                               Total Over 5 Year Period        $336,100
                                                                                                                                        Total Over 5 Year Period + 150%        $504,150




* Maintenance Requirements are based on Water by Designs, Maintaining Vegetated Stormwater Assets (2012) and Rectifying Vegetated Stormwater Assets (2012). Refer to these documents for further details.
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                      Refer to Water By Designs, Guide to the Cost of Maintaining Bioretention Systems (2015) for estimated costs involved with maintenance of the Bioretention Basins