NEW PRODUCT RUNDOWN

The last few months have seen a marked increase in new products to enhance the use of the HydraSleeve No-Purge sampler. This year the level of interest in and the use of the HydraSleeve have increased dramatically and show no sign of slowing. It's hard to ignore the advantages offered by passive/no-purge sampling in general and the simplicity, cost savings and unique features (sample all contaminants, large sample volume, ease of use) provided by the HydraSleeve.

1. We have modified the 2-inch HydraSleeve (fits 2-inch wells, 30" long and holds 650 mls) to hold 1 liter of sample. Tests have shown the modified 1-liter sampler, when equipped with bottom weight, will easily fill within a saturated 10-foot well screen. Currently these samplers are custom fabricated.

2. Two new top weights are available to improve sampling in wells with a short water column
(< 5 feet) in the screen or short screens.

• The new 8 oz. stainless steel top weight is used to compress the top of a standard 2-inch, 650 ml HydraSleeve to within about 6" of the bottom of the well. When recovered during sample collection the HydraSleeve will fill in a 3-4 foot water column. The new weight can also be used as a bottom weight.
  
• A 16 oz. top weight is available to increase the effectiveness of the custom 2-inch, 1-liter HydraSleeve in a short water column. Using the heaver top weight, a one-liter sample can be collected from a 2-inch well with 4-5 feet of water in the screen. This weight can also be used as a bottom weight.
  
  Tip: If less sample volume is needed than provided by a full length HydraSleeve a knot can be tied in the sleeve. This reduces the volume sampled and shortens proportionately the length of the water column needed for the sampler to fill. For example, tying a knot in the middle of a 30" long HydraSleeve will cut the distance for the sampler to be pulled to fill in half.
  

3. In order to provide a non-metallic and less expensive alternative to stainless steel bottom weights we have developed silica sand weights. These weights consist of sand-filled porous, inert filter tube. The durable tubes allow water to saturate the sand, increasing its specific gravity and effective weight when submerged. Stainless steel has a specific gravity about 4 times greater than saturated sand. Due to the density difference, the 8 oz. sand bottom weight must be 12" long to provide the same effective weight as the 2.5"-inch long stainless steel weight in the same diameter. The sand/tubing combination permits custom weights to be rapidly fabricated for specific requirements, i.e. heavier weight needed for multiple samplers deployed at greater depths. Note: Due to the porous nature of these weights they cannot be effectively decontaminated and should be dedicated to a single well. Although the filter tube is durable, we do not know how long they will last. Unlike stainless steel weights, they may periodically need to be replaced.

4. On a more technical note, we have produced a HydraSleeve sampler (HS-2-COMP) that can collect and composite, in-situ, a 1-liter sample from a 7-9 foot vertical interval in a 2-inch well. This is significant because a single sampler, equipped with top weight, can collect and composite fluid from a 10-foot saturated screen, replicating the vertical mixing that occurs when purge sampling methods are used. The long composite sample minimizes the need for vertical profiling (unless desired) in 10-foot wells to assure that potentially stratified contaminants are not missed. In essence, the new sampler provides a blended vertical profile within a saturated 10-foot well screen. A 4-inch well version (HS-4-COMP) is also available.

5. We now have the capacity to make custom suspension tethers and supply spools of suspension line for field fabrication.

HydraSleeve No-Purge Sampling  •  Passive Ground Water Sampling
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