5.3.3
Groundwater level logging, sampling methods and laboratory analytes
Groundwater monitoring under this SMP will include the following groundwater level measurement and groundwater quality sampling activities: — Groundwater levels will be measured during each monitoring event using a calibrated dip tape to provide manual water level data across all monitoring locations. — Automated water level loggers will be installed in selected monitoring bores to provide continuous groundwater level records, allowing assessment of short‑term fluctuations, seasonal trends, and responses to recharge events and TSF operations.
— Manual dip measurements will be used to validate logger data and ensure data accuracy and consistency.
— Groundwater samples will be collected using low‑flow sampling methods.
— Field parameters, including pH, electrical conductivity, temperature, dissolved oxygen, and oxidation–reduction potential, will be monitored during purging to confirm stabilisation prior to sampling. — Laboratory analysis will include analytes consistent with DETSI requirements for mine‑affected groundwater, comprising:
— general water quality indicators (pH, electrical conductivity, total dissolved solids where applicable);
— major ions (sulphate, chloride, alkalinity, calcium, magnesium, sodium, potassium); and
— dissolved metals and metalloids (including aluminium, iron, manganese, arsenic, cadmium, copper, lead, zinc, nickel, and chromium).
— Analysis will be undertaken by NATA accredited laboratories.
The analyte suite may be reviewed and refined over time based on monitoring results, regulatory feedback, and improved understanding of groundwater chemistry and seepage risks.
5.4 Conceptual model update and validation Upon completion of each relevant field campaign, the data acquired will be systematically reviewed and evaluated to assess their implications for the conceptual model and future numerical simulations, including groundwater flow processes, hydraulic properties, boundary conditions, and potential seepage pathways. The conceptual model will be updated and validated as necessary to reflect the improved understanding derived from these data. A technical memorandum will be prepared documenting the outcomes of the review, including any updates to the conceptual model, and will provide recommendations for the way forward with respect to seepage management, monitoring requirements, and any further investigations required to support ongoing implementation of the SMP.
Project No PS213278 Mount Morgan Mine - Upper Mundic Gully TSF Seepage Management Plan Heritage Minerals
WSP May 2026 Page 25
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