Reference Documents - OPW24-0098

                                                                                           ADG Consulting Pty Ltd


     Table 5 Monitoring responsibilities

                           Activity                          Frequency          Responsibility        Person

       Monitoring of field parameters in discharge water
                                                                 Daily           Site Manager      Site Manager
       and untreated extracted groundwater

       Monitoring of field parameters in untreated
                                                                                                  Environmental
       extracted groundwater, discharge water,                 Weekly           ADG Consulting
                                                                                                    Consultant
       receiving waters and background waters

       Laboratory analysis of samples recovered from                                              Environmental
                                                               Weekly           ADG Consulting
       discharge water and receiving waters                                                         Consultant

       Monitoring of field parameters in extracted                                                Environmental
                                                               Weekly           ADG Consulting
       groundwater (pre‐treated)                                                                    Consultant

       Laboratory analysis of samples recovered from       Initially, then as                     Environmental
                                                                                ADG Consulting
       extracted groundwater (pre‐treated)                     required                             Consultant

6.6 Maintenance
     The groundwater treatment systems must be regularly maintained. Maintenance must include:


          Regular cleaning and or replacement of the filters within the filtration unit, where required to be
           installed.
          Regular removal of sediment from the sedimentation tank. The sediment must be either returned
           to the excavation pit for dewatering and bulking out with excavated material, or removed from the
           site by a licensed liquid waste contractor.
          Regular check of the dosing system and top‐up of buffering solutions and flocculants.
6.7 Reporting
     Dewatering management procedures and monitoring results will be reviewed by ADG Consulting weekly
     to ensure that the treatment procedures are effective, and that the receiving waters are not being
     impacted by the extracted groundwater being discharged.

     The following reporting procedures will be adopted:


          A summary report will be prepared upon completion of the initial pre‐discharge monitoring. The
           report will be submitted to the Site Manager, Dewatering Contractor, and NSC upon request.
          Weekly interim reports will be prepared upon receipt of laboratory data for each round of ongoing
           compliance monitoring. The interim reports will display all data obtained during the previous
           monitoring event, and provide comments and recommendations based on the results.
          A dewatering compliance report will be prepared on completion of the project (upon request).
     The above reports will be prepared by ADG Consulting and provided to the Site Manager and Dewatering
     Contractor as they become available. The reports will include all water quality results and comparison to
     the WQOs, corrective actions and recommendations made to the Site Manager and Dewatering
     Contractor during the monitoring period.

     The Site Manager must keep records of complaints, volumes of chemicals used, and treatment methods
     employed. These records must be available on‐site at all times and submitted to NSC by the Site Manager
     upon request.




ADG1673.24 Dewatering Management Plan_Rev0_12.07.24                                                        Page 16