ADG1290.21 Dewatering Management Plan_Rev1_02.02.22 · OPW21/0315

                                                                                        ADG Consulting Pty Ltd


              Installation of activated carbon filtration or other fine media filtration to retain suspended
               sediments and/or heavy metals.
              Install a floating sediment curtain/s around the stormwater termination point in the receiving
               waterway to prevent unsightly plumes and contain sediment and/or heavy metals for periodic
               removal (subject to approval by Noose Shire Council).
              Preventive and corrective actions shall be taken in the event that groundwater monitoring
               observations indicate that unexpected groundwater contamination has been encountered
               during dewatering. The most appropriate action(s) shall be dependent on the stage of
               construction and risk of adverse impacts to groundwater users and the receiving environment.
              Any modification to the dewatering system and pumping rates shall be in consultation with a
               suitably qualified scientist/geotechnical/engineer.
              Following heavy rainfall all ponded surfaces waters are to meet discharge criteria (Table 3) prior
               to offsite discharge. Where discharge criteria not met, Site Manager to obtain approval from
               Dewatering Contractor regarding treating surface waters with treatment gear before offsite
               discharge.
              Pumping systems and shoring works to be maintained in fit for purpose state by Dewatering
               Contractor and/or shoring contractor. In the event that dewatering equipment has failed and is
               likely to cause a significant impact on the environment, or surrounding properties (i.e. flooding)
               the Dewatering Contractor is to be contacted immediately. The Principal Contractor, in
               consultation with the Dewatering Contractor shall be responsible in rectifying the failure in a
               practicable time frame to minimise potential impacts. Equipment, spare parts, materials and
               tools necessary to manage aspects of the system/s which present a high risk of significant
               impacts in the event of failure (if any) shall be readily available.
               Construction vibrations could potentially cause settlement in the loose upper level sands,
               thereby damaging nearby structures founded in these strata. Prior to commencement of
               construction on site (including staged works), it is recommended that a detailed dilapidation
               survey be undertaken to establish the condition of all existing adjacent structures, roads and
               services.




ADG1290.21 Dewatering Management Plan_Rev1_02.02.22                                                       Page 17