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Purge Stabilization Methods and Criteria

How should purging parameter limits be established?

Are the EPA standards for parameter stabilization supported by other research?

What is the difference between “purge until indicator parameters are stable” and low-flow purging and sampling?

If you determine that low-flow sampling will not work in a well, can sampling still occur the same day?

How can you do low-flow sampling without parameter stabilization?

What if your wells are low-yield and you cannot get the water level to stabilize even at a very low flow rate, or you have a 5-foot drawdown at a well with a 10-foot column of water, can low-flow sampling still be used?

What is the most critical parameter to stabilize before sampling?

Does it make sense to use historical purge volumes along with parameter stabilization with low-flow purging?

Does the flow-through-cell use a Photo DO method?

How do you determine when the readings are stabilized? If one of them is still climbing or dropping slightly, but is within the stabilization criteria, is it alright to sample?

Would it be quicker and equally effective to use normal purging and filter the samples if you’re only concerned with metals contamination?

Why isn’t DO percentage appropriate for stabilization criteria aside from the fact that you can’t document or track your DO over time?

What purge method would you recommend for regional studies utilizing private domestic wells?

When pH temperature and conductivity are being documented, how important is DO in determining accuracy in a sampling well?

The well parameters are stable but are below the recommended purge rate.  Will a sample be representative?

If an aquifer is under confined conditions do you need field parameters?

Can you supply any Dissolved Oxygen stabilization range information