What if a site has completed a commercial/industrial closure and then a wellhead protection area is described that encompasses the site?
If the site has already received its closure document from IDEM, no further action would be required. If the site is in the process of workplan development or remediation, a decision will be made on a case by case basis. Top 6. IDEM released a notice in August 2006 announcing that it had changed the default closure levels for several polycyclic aromatic hydrocarbons (PAHs). Does this change work retroactively for these compounds in previous versions of the default closure level tables? Yes. In the case of the nine PAHs referenced in the August 2006 announcement, the ground water closure levels were based on solubility. However, the solubility levels were so low as to make them effectively insoluble. These low solubility levels were sometimes below detection limits that can be readily achieved by laboratories. As such, it was decided that defaulting to the health protective levels for these compounds would be appropriate. Since this is not a change to the health protective levels, but r
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