Undoing changes that we think might be causing the issue
Merge pull request #41 from jiwalker-usgs/NAWQAAN-334

Undoing changes that we think might be causing the issue
Merge pull request #42 from thongsav-usgs/master

Changed "Discrete QW" to "Sample Concentrations"
Added GetDataAvailability call to filter out station ids which do not
exist on the SOS service as valid features of interest.