Appendices:
McClellan Normality Chart PDF (71 KB)
McClellan Scatterplots PDF (560 KB)
McClellan Plots PDF (194 KB)

McClellan Report Excerpt

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 by clicking on the links above.