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Fehr Graham submitted a claim and a Remedial Action Documentation Report to DNR in February 2015. Soil chemistry results indicated remaining soils at the site contain levels of PVOCs+N at levels above regulatory residual contaminant levels for non-industrial sites. The observed concentrations are present in soil within and beyond the limits of the December 2014 excavation.
The observed soil above RCLs does not pose a risk to human health or the environment due to the limited potential for direct contact exposure. The site has a grass vegetation cover, a gravel parking lot, a 1,500 square foot garage building, and a separate home.
Fehr Graham sampled the site monitoring well network in March 2015. In general, shallow groundwater contamination exists at the site, but removal of the majority of the petroleum-contaminated soil across the capillary fringe should result in improvements to the groundwater. Upon completion of the second post-excavation groundwater sampling event in Fall 2015, a brief summary report will be sent to the WDNR that documents the completed actions. The report will include details regarding groundwater monitoring activities and will summarize laboratory analytical results.
Discussions will be held with the WDNR regarding the results and whether case closure can be pursued at that time.
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