Snap Sampler - Representative Results for Passive Samplers

SNAP Sampler Graphic

Performance

Objective

Data Requirements  Success Criteria  Results
Quantitative
1.  Ability to sample a range of contaminants at site Adequate sample volume for all analyses Similar detection capabilities (as with low- flow sampling) Yes
2.  Reproducible data Analyte data for replicate samples Among replicate samples, a %RSD of 25% or less, or equal to or better than that for low-flow samples

Yes for VOCs, dissolved inorganics, and total non- metal ions.

Testing problems occurred for some total metals analyses for both Snap Sampler and low-flow sampling

3.  Agreement between sampling methods for analytes of interest Analyte concentrations for each sampling method for all wells

Lack of statistically significant differences

Lack of bias

Yes, except total Fe and total Mn, where testing problems limited determinations
4.  Reduced sampling time Field records of activities at each well Less time needed to sample a well Yes
5.  Less costly sampling method

Records of the costs for equipment and supplies

Field record of technician’s time

Cost savings of at least 25% Yes, 46%-67% cost savings
Qualitative
1.  Ease of use Field records of activities at each well Technician able to learn the procedure with relative ease Yes
2.  Ease of use Field records of activities at each well Few problems requiring second attempt to sample the well Yes (providing manufacturer’s directions were followed)
3.  Ease of use Feedback from field technician Operator acceptance Yes
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