Groundwater Professional Bulletin Board

BEDROCK MUNICIPAL WELL SAMPLING PROJECT DISCONTINUED

The contract between the Underground Storage Tank (UST) Fund and University Hygienic Laboratory (UHL) to sample municipal water supplies within one mile of leaking underground storage tank (LUST) bedrock sites was NOT renewed for 2004. In other words, the mass sampling of potentially effected public water supplies will no longer be conducted by the UST Fund/DNR/UHL. Sampling public water supplies must be incorporated into individual granular and nongranular site groundwater sampling events by the certified groundwater professional project manager.

As part of the Risk-Based Corrective Action process, any public water supply well located within one mile of a LUST site which is in a granular or nongranular bedrock area must be sampled for chemicals of concern [Refer to 135.10(3)"g"2].

A LUST site that is evaluated using special bedrock procedures, for which municipal well sampling data are needed for risk classification or reclassification purposes, will need to include public water sampling as part of the individual site evaluation. With the cancellation of the UHL public water supply sampling contract the certified groundwater professional project manager will be responsible for conducting the water supply sampling.

If you are completing a Tier 2 or annual monitoring for a bedrock site, we strongly recommend reviewing the files for nearby LUST sites to see if the affected municipal wells have already been sampled this year and in subsequent years. Data collected to date under the UST Fund/UHL contract may be found at the following link: Municipal Well Sampling Data .

Please contact Elaine Douskey at (515)281-8011 or elaine.douskey@dnr.iowa.gov if you have questions about this posting.