What if Ive used an analytical method that doesnt have a low enough detection limit, but there are other methods available that have lower detection limits?
With all of the different analytical methods that exist today, it is hard to determine which one may be the best. As a general rule, it is recommended that the method with the lowest detection limit be used, especially if you intend to seek closure of the site. If you have previous samples that were analyzed using an analytical method that has a higher detection limit, DEQ/SRS will generally require that you collect some additional confirmation samples and have them analyzed using the method with the lowest possible detection limit to show that the contamination has been cleaned up or does not exist before a closure letter can be issued.
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