Field Test Study Conducted in Association with The University of Waterloo

Note the very good correlation coefficients (R-squared) with both polyethylene diffusion bags and low-flow purge sampling. The linear trendline slope of less than 1 for both low-flow and PDBs indicates a consistent pattern of slightly higher results for Snap Samples. A 1:1 trendline would indicate a direct 1:1 correlation. These results show about a 1.1:1 ratio across wide concentration ranges. T-test statistics show that these results are significant at the 95% confidence level.