Compiled Reference Document - MCU25/0020 (As Published)

ADG Consulting Pty Ltd

 

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Table 5 Monitoring responsi

Activity Frequency Responsibility Person
Monitoring of field parameters in discharge water Daily Site Manager Site Manager
Monitoring of field parameters in discharge reer Environmental Environmental
water, receiving waters and background waters y Consultant Consultant
Laboratory analysis of samples recovered from reer Environmental Environmental
discharge water and receiving waters y Consultant Consultant
Monitoring of field parameters in extracted Initially, then as Environmental Environmental
groundwater (pre-treated) required Consultant Consultant
Laboratory analysis of samples recovered from _Initially, then as Environmental Environmental
extracted groundwater (pre-treated) required Consultant Consultant

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

— Regular cleaning and or replacement of media 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.
Reporting

Dewatering management procedures and monitoring results will be reviewed by the Environmental
Consultant 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:

—  Asummary 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.

—  Adewatering compliance report will be prepared on completion of the project (upon request).

The above reports will be prepared by the Environmental Consultant 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.

Contingencies

If water quality monitoring indicates ongoing exceedances of the performance criteria, and the water
quality objectives for the receiving waters cannot be met, then corrective actions will be adopted as
necessary. Possible contingencies may include one or more of the following:

 

ADG1786.25 Dewatering Management Plan_Rev1_07.10.25 Page 16