The Army Corps ESTCP study is the most extensive 3rd-Party evaluation of the Snap Sampler method completed to date.
There are 5 complete reports and several presentations included here for free download.
A Fact Sheet explaining results in a short synopsis is included here:
Parker, Louise and Nathan Mulherin, 2007, Evaluation of the Snap Sampler for Sampling Ground Water Monitoring Wells for VOCs and Explosives. U.S. Army Corps of Engineers, ERDC/CRREL TR-07-14, 68p. DOWNLOAD PDF
Parker, Louise V., Nathan D. Mulherin, and Gordon E. Gooch, 2008. Evaluation of the Snap Sampler for Sampling Ground Water Monitoring Wells for Inorganic Analytes. U.S. Army Corps of Engineers, ERDC/CRREL TR 08-25, 74p. DOWNLOAD PDF
Parker, Louise, Nathan Mulherin, Gordon Gooch, William Major, Richard Willey, Thomas Imbrigiotta, Jacob Gibs, and Donald Gronstal, 2009, Demonstration/Validation of the Snap Sampler Passive Ground Water Sampling Device for Sampling Inorganic Analytes at the Former Pease Air Force Base, U.S. Army Corps of Engineers, ERDC/CRREL TR 09-12, 101p. DOWNLOAD PDF
Parker, Louise, Nathan Mulherin, Gordon Gooch, Tommie Hall, Constance Scott, Jay Clausen, William Major, Richard Willey, Thomas Imbrigiotta, Jacob Gibs, and Donald Gronstal, 2011a, Environmental Security Technology Certification Program - Project ER 0630, Demonstration/Validation of the Snap Sampler Passive Groundwater Sampling Device at the Former McClellan Air Force Base, U.S. Army Corps of Engineers, ERDC/CRREL TR 11-3, 117p. DOWNLOAD PDF
Parker, Louise, Nathan Mulherin, Gordon Gooch, Tommie Hall, Constance Scott, Jay Clausen, William Major, Richard Willey, Thomas Imbrigiotta, Jacob Gibs, and Donald Gronstal, 2011b, ESTCP Cost and Performance Report – Demonstration/ Validation of the Snap Sampler - Project ER-0630, U.S. Army Corps of Engineers, ERDC/CRREL TR 11-11, 55p. DOWNLOAD PDF
A consolidated presentation of Snap Sampler comparisons are presented that show the Snap Sampler works well for all analytes tested. Louise Parker of the US Army Corps Cold Regions lab presented this study at the "Nielsen" North American Environmental Field Conference in Tampa, Florida in January 2008.
This poster presentation by Louise Parker and Nathan Mulherin from the the December 2007 SERDP/ESTCP conference illustrates the results of metals sampling at Pease Air Force base in New Hampshire.
The data illustrate that the Snap Sampler performed well for metal analytes when compared with low flow purging and the regenerated cellulose passive sampler.