Final Assessment Investigation - LUSTs

Final assessment and on-site investigation following known LUST releases.


Assessment, delination, reporting, and remedial and closure activities were required to determine the impacts of diesel and unleaded fuel releases from underground storage tanks at a distribution warehouse.
Flint, MI



Global was retained by the Michigan Department of Environment, Great Lakes and Energy – EGLE to conduct a Final Assessment Investigation and report under the Part 213 of the Michigan Natural Resources and Environmental Protection Act (NREPA), 1994 P.A. 451, as amended, on property located in the City of Flint. The subject property consists of a large warehouse and attached administration building.  The property had three (3) former underground storage tanks (USTs) on the subject property (10,000-gallon gasoline UST, 5,000-gallon diesel UST and 1,000-gallon gasoline UST).   The tanks were removed from the ground previously, a release was confirmed and is a Part 213 Leaking Underground Storage Tank (LUST) site.  

As part of the Final Assessment on-site investigation Global conducted the following tasks:  a Ground Penetrating Radar (GPR) and Radio Detection (EM) Investigation to locate any possible Underground Storage Tanks (USTs) and utilities in specified area of the site; conduct a site survey to locate site features including buildings, utilities, fences, etc., and all soil boring locations and monitoring wells; install over thirty (30) soil boring locations and five (5) monitoring wells for groundwater and soil sample collection; and install three (3) soil vapor pins for soil gas sample collection.  Under the direction of the EGLE Project Manager, Global has conducted on-site soil and groundwater investigations and soil vapor investigations.  

The purpose of the environmental investigation was to define and characterize the vertical and horizontal extent of soil and groundwater contamination for the purpose of preparing a Final Assessment Report. To determine the extent and distribution of soil and groundwater contamination associated with this site, Global conducted soil borings and obtained soil and groundwater samples for chemical analysis.  The soil borings were advanced utilizing a track mounted GeoProbe® DT66.  Soils were continuously screened using handheld photoionization detector (PID), as well as, visually and olfactory for evidence of contamination.  In addition, the soil classification was determined and recorded for use in soil boring log preparation and potential future remediation options.  

Once results of the investigations were reviewed, the scope of work was updated to include preparation of a Technical Memo in place of a Final Assessment Report and two years of quarterly monitoring of the five (5) monitoring wells and three (3) soil vapor pins. The scope of work was updated  to include the installation of an additional five (5) soil vapor pins. Quarterly sampling of soil vapor pins continues in addition to Monthly Vac Truck events.  

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