ProHydro- QED Environmental Systems, Inc.
Monitoring Choices—The Snap Sampler
Monitoring Choices—The Snap Sampler The Snap Sampler is a proven and regulatory-accepted passive groundwater sampling approach that seals groundwater samples in situ, and eliminates most of the effort required to collect samples. The Snap avoids transport of pumps, controllers, meters, and purge water waste containers. The Snap Sampler is quick and easy—you can collect 15 to 20 samples in a day, while saving 50% or more on sample collection cost. Manufacturers of other “no-purge” sampling devices may make similar claims, but they don’t provide Snap Sampler data quality. Only the Snap Sampler provides an in situ quality sample. Why would you choose anything else? What does the Snap Sampler offer that the others don’t? ? The Snap Sampler collects an actual water sample that can be used to test for any chemical. Diffusion-based devices collect a proxy water sample that is a reflection of only those contaminants that can diffuse through the membrane. Polyethylene bag samplers cannot be used for inorganic constituents, semi-volatile organics, and several important VOCs, including MTBE, trimethylbenzenes, ketones, and 1,4-dioxane. ? Snap Samplers capture undisturbed samples without any of the agitation associated with forcing a sleeve-type sampling device up through the water column or oscillating it up and down to capture the sample. For turbidity sensitive analytes (such as metals, and many organic chemicals), this is a critical difference. ? Snap Samplers are dedicated and NOT thrown away after every use. All water collected is utilized for sample analysis. Replacement sample bottles can be used when sealed in situ samples are desired, and are submitted directly to the laboratory. As a result, all contaminated bottleware is either submitted to the lab or reused—no solid or liquid contaminated waste handling is required. What are the data quality differences? ? Snap Samplers have undergone substantial validation in third-party comparison studies involving volume-based purge sampling and low-flow purging and sampling techniques. According to these studies, the Snap Sampler best reflects formation water chemistry. The accompanying graphic results show that there are qualitative and quantitative differences among the different sampling approaches. These graphics illustrate “noisy” data of the other passive sampling approaches, while the Snap Sampler shows comparatively less noise in these comparisons. Data plots are from: Parsons. 2005, Final Results Report for the Demonstration of No-Purge Groundwater Sampling Devices at Former McClellan Air Force Base, California. Parsons Engineering Science. September 2005. What about the cost differences? The Snap Sampler offers superior data quality at similar or lower cost than other methods. Initial and long term savings depends on mode of use. When a single Snap Sampler bottle is used (and reused) to collect and pour sample into laboratory-supplied VOA vials, the Snap Sampler is less expensive than any other sampling method. When the Snap Sampler is used in the highest data quality—sealed-in-situ—mode, ongoing cost is slightly higher, but you get something substantive for just a few extra dollars. In the sealed-in-situ mode, samples are sealed downhole in the bottles that go to the laboratory, never exposed from the time they are “snapped” until they are analyzed. There are obvious data quality benefits of having unexposed samples, as shown in the illustrations above. Contact us today www.SnapSampler.com (585) 385-0023 Cost comparison Initial and ongoing costWhy compromise?Save money Improve data quality Try the Snap Sampler Nearly Perfect
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