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Passive water sampling takes a representative groundwater sample without any purging or pumping from the bore. The Hydrasleeve is an easy-to-use example of this methodology that can be deployed for months at a time. Collecting a sample with a HydraSleeve is usually a simple one-person operation.

The standard HydraSleeve components are detailed in the picture below. You will also require a clip for the top of the sleeve to allow easy connection of a tether rope for deployment.

The HydraSleeve is deployed using the following steps:

1. Using the tether rope, carefully lower the HydraSleeve to the bottom of the well, or to your preferred depth in the water column. Make sure that there is at least 1m of water above the HydraSleeve as this is where your sample will be collected from. Hydrostatic pressure in the water column will keep the self-sealing check valve at the top of the HydraSleeve closed, and ensure that it retains its flat, empty profile for an indefinite period prior to recovery.
   
2. Secure the tether rope at the top of the well.
   
3. The well must be given time to equilibrate. This is the time it takes for conditions in the water column (primarily flow dynamics and contaminant distribution) to restabilize after vertical mixing occurs (caused by the installation of a sampling device in the well). As a rule of thumb, the HydraSleeve should be left overnight at a minimum but can be left in the well for an indefinite period of time without concern.
   
4. To recover your sample pull the tether rope up by 1m (the length of the sleeve) in one smooth motion. This will open the top check valve allowing the sleeve to fill. Once the HydraSleeve is full, the top check valve will close preventing loss of sample and entry of water from zones above.
   
5. Continue pulling the tether upward until the HydraSleeve is at the top of the well.
   
6. Discard the small volume of water trapped in the Hydrasleeve above the check valve by pinching it off at the top under the stiffeners (above the check valve).
   
7. Use the discharge tube to pierce the HydraSleeve and collect your water sample.

The video below shows an animation of the Hydrasleeve in action

If you would like to learn more about ECO Environmentals range of HydraSleeves including HDPE options, please call us on 08 9328 2900 or learn more about the Hydrasleeve here.