This publication reports the results of a field demonstration of six "no-purge" groundwater sampling devices. Analyses of VOCs , metals, anions, and 1,4 dioxane levels in samples from four diffusion and two grab-type samplers were compared to those from conventional low-flow and three-well-volume purge samples. The study was conducted at the former McClellan Air Force Base, Sacramento, California.

The two grab-type samplers delivered results that were typically more similar than the diffusion-based samplers to the conservative (i.e. higher concentration) results from the conventional sampling methods. Of the two grab-type samplers, "the HydraSleeve® was substantially less expensive based on the assumptions used in the cost analysis, although both methods were less expensive than the conventional approaches. The HydraSleeve was simpler to deploy and retrieve, and permits a larger volume of water to be collected."

Of the six no-purge devices tested, the HydraSleeve was also the only one that delivered viable samples for all of the analytes tested. The report concludes that it "...appears to be a technically viable method for monitoring all of the compounds included in this demonstration."

For all the details, read the full report here.

PERFORMANCE COMPARISON:
DIRECT-PUSH WELLS VERSUS DRILLED WELLS

"No significant performance differences were observed between the direct-push wells and drilled wells."

This was the reported result of a ground-breaking study sponsored by the Naval Facilities Engineering Command. The comparison was conducted on the leading edge of a methyl-tertiary butyl ether (MTBE) plume at Naval Base Ventura County, Port Hueneme, California. The study design was assisted and work reviewed by an advisory committee of experts from industry, government regulatory entities, and academia.
For the complete text of this report, go to the PDF document download page.

QUICK REFERENCE:

GeoInsight Product "Cheat Sheet"
If you could use a handy, one-page chart of our products and some other useful information, download and/or print out this PDF. You could even laminate a copy and take it out in the field!
Summary Specifications PDF

Here are some sites that provide support or documentation for direct-push sampling, small diameter wells, and/or other technologies that may help you in your projects.

• 2006 North American Environmental Field Conference & Exposition
  The Nielsen Environmental Field School, Inc.
  THE SOURCE For Practical, Hands-On Environmental Field Training