Case Study: Environmental Audit

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OK TEDI MINES LTD, Papua New Guinea, Water Quality Review

A review of the Industrial Sites Management Water Monitoring Program was undertaken on behalf of OTML.

The study included a review of relevant PNG legislation relating to water quality monitoring, Surface water, mining, including the Mining
Code of Practice & the Environment Act.

Historical monitoring data was available over a 3-year period, including surface water flow and quality in the Fly & Ok Tedi rivers, and groundwater data.

For each discharge point, water quality was compared to applicable environmental standards. Areas of apparent non-compliance were
identified.  Recommendations were made for further assessment/ investigation and/or changes to the monitoring suite.

A review of sampling and laboratory analytical protocols was undertaken.
Recommendations were made for improved sampling protocols, and the  implementation of improved quality assurance procedures.

Analytical results from two laboratories were compared, and recommendations made for improvements in reporting & Quality Assurance/ Quality Control (QA/QC) procedures.

Stuart Jeffries
Hydrosolutions Pty Ltd

Environmental Consultants

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Audit 9

via Hydrosolutions | Groundwater and Environmental Consultants http://hydrosolutions.com.au

Case Study: Hydrogeology

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TARMAC ROADSTONE (WESTERN) LTD, Cheshire, England.
Groundwater numerical modelling of quarry dewatering & associated impacts

As assessment of the hydrological & hydrogeological impacts of dewatering a large open sand-pit was undertaken.

Existing hydrogeologival data was reviewed, and a groundwater and surface water monitoring network was established.  A program of  hydraulic testing to establish aquifer parameters, and geotechnical testing to establish mineral properties and available landbank was undertaken, together with a surface water stream gauging exercise.

A groundwater numerical model was constructed using MODFLOW, which was calibrated against historical abstraction, groundwater level and surface water flow records.

The effect of drawdown on streamflow and perched water levels within streams was assessed, together with interference effects on
licensed groundwater abstractions.  An assessment of potential settlement impacts due to dewatering on adjacent nearby properties was also undertaken.

Recommendations were made for groundwater management and disposal, and augmentation of the existing groundwater monitoring network.

Stuart Jeffries
Hydrosolutions Pty Ltd

Groundwater Consultants

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Hydro11

via Hydrosolutions | Groundwater and Environmental Consultants http://hydrosolutions.com.au