Melbourne:
Tuesday 21st November 2006
Sydney:
Tuesday 21st November 2006
Brisbane:
Thursday 23rd November 2006
Perth:
Thursday 23rd November 2006
Auckland:
Monday 4th December 2006

Up Coming Workshops
February 07
Low-Flow Sampling / Micropurge kits
April 07
Water Level Loggers - LevelTROLL
June 07
Combustible Gas (LEL) Monitors – QRAE & MultiRAE
August 07
Landfill Gas Monitors – GA2000

    Low-Flow Groundwater Seminars Roundup

Click here to download the presentation and reference papers

Over 350 people attended the latest series of industry seminars, organised by Enviroequip in Melbourne, Adelaide, Perth, Brisbane, Sydney and Auckland.  Low-Flow Ground Water Sampling was the topic and the presenter was Mr David Kaminski of QED Environmental Systems.  Mr Kaminski, an expert on groundwater sampling methods, received very positive feedback from the events. 

Mr Kaminski covered a lot of material during the three hour seminar including how ground water sampling procedures were developed and a comparison of the common types of sampling methods.  The Low-Flow Sampling Method was discussed in detail and was followed by a demonstration of the recommended equipment for best sampling. 

Mr Kaminski showed that low-flow ground water sampling can improve sample accuracy and precision and avoid biases associated with turbid samples. The method provides flow-weighted average concentrations from typical monitoring wells, and is the best approach for determining the true mobile contaminant load in most monitoring scenarios.

The common misconception that low-flow samples represent a narrow zone within the screen was addressed.  Field experiments, laboratory simulations and numerical modeling support the position that samples are derived from the entire screen zone under low-flow pumping conditions.  Modeling also concludes that pump placement has no significant effect on the flow pattern into the well; geology is the controlling factor.

Purging very-low-yield wells was discussed.  This applies to wells that cannot be pumped at low rates (100 ml/min) without continuous drawdown.  "Minimum Purge Sampling" is less disruptive than well evacuation and minimizes sample chemistry alteration. 

The three main steps of Low-Flow Sampling were presented and demonstrated:
1) Setting the purge flow rates
2) Controlling drawdown
3) Water quality parameter stabilisation

Click here to download the presentation and reference papers

The NEW Aqua TROLL® 200, the first in a new line of water quality instruments from In-Situ Inc, monitors and logs conductivity, level/pressure and temperature in the harshest environments.

Designed to combat fouling and conserve power, the Aqua TROLL® 200 is built to extend deployment. Power on external 8-36 VDC or internal batteries that are guaranteed for 5 years when logging in 15 minute intervals. Ultra-rugged, corrosion-resistant, titanium construction and small, 0.72” (18.3 mm) diameter make the Aqua TROLL® 200 ideal for demanding marine, surface and groundwater applications.

Building on the successful Level TROLL® platform, the Aqua TROLL® 200 is SCADA and telemetry ready. Standard outputs include Modbus/RS485, SDI-12 and 4-20 mA.

Select between gauged and absolute models with ranges up to 500 psi. All feature a 4MB memory that stores up to 200,000 data points. Standard logging modes include linear, fast linear, linear average and event testing with sampling rates as fast as 1/sec. 

Applications

• Saltwater Intrusion Project
• Tide Gauge Monitoring
• Groundwater Monitoring
• Surface water Monitoring

• Wetlands Applications
• Estuary Projects
• Discharge Monitoring
• Aquifer Storage & Recovery
• Landslide Prediction

QED Sample Pro Bladder Pump
• Quick-change, one-piece bladder design
• Easy disassembled by hand - without tools
• Delivers consistent low flow rate to 76m depth
• Inlet is located near the top so you don't sample sediment, plus ensure better VOC sampling
• Short length minimises snagging in bent wells

QED MP10 Digital Controller
• Flow control at the push of a button. No need to bother with multiple manual-adjusting timer knobs
• Recall a well's pumping setting - no need for the next field person to start from scratch
• Full digital display of all setting and status information
• Connection port for MP30 Drawdown meter which automatically assures standby mode if drawdown limits are exceeded.

MPLite Compressor & Internal Battery
• Internal compressor with 100 psi out put will pump from 50m depths.
• Whole system is under 10kg in an easy carry case
• Includes mains charger to let you recharge over night ready for the next day
• Includes battery leads for those times you do want to run off external battery power.

QED MP30 Drawdown/Water Level Meter
• More than just a water level meter!  Provides unique MicroPurge Automatic Drawdown Control. Cable link to basics controller puts pumping on standby mode until the well recovers — automatically!
• MicroPurge drawdown mode includes light and buzzer indicators to alert sampling personnel when the selected maximum drawdown point has been reached.
• Standard water level mode includes conventional probe submergence light and buzzer indicators.

MP10 Digital Controller

MPLite Compressor

MP30 Drawdown Meter

Enviroequip is Australia's Low-Flow Expert...

Contact your local Enviroequip office for help with your groundwater sampling application.