Reference Document - OPW23 0189

                                                                                         ADG Consulting Pty Ltd


           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.




ADG1580.23 Dewatering Management Plan_Rev0_28.09.23                                                       Page 16