Soil Vapor Monitoring in East Michigan

Global was retained by the Michigan Department of Environmental Quality (now Michigan Department of Environment, Great Lakes and Energy – EGLE) to conduct a Final Assessment Investigation and report under Part 213 of the Michigan Natural Resources and Environmental Protection Act (NREPA), 1994 P.A. 451, as amended, on property located in a mid-sized city in east Michigan, currently utilized as a service truck garage. The subject property consists of a large warehouse and attached administration building with former underground storage tanks (USTs). A release was confirmed and is a Part 213 Leaking Underground Storage Tank (LUST) site.

As part of the Final Assessment investigation, Global conducted the following tasks:  

- Site Survey
- Ground Penetrating Radar (GPR) Investigation
- Radio Detection (EM) Investigation
- Installation of thirty (30) soil boring locations and five (5) monitoring wells for groundwater and soil sample collection
- Installation of three (3) soil vapor pins for soil gas sample collection

The purpose of the environmental investigation was to define and characterize the vertical and horizontal extent of soil and groundwater contamination in preparation for 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. Soils were continuously screened using a handheld photoionization detector (PID), and screened with visual and olfactory techniques for evidence of contamination. In addition, the soil classification was determined and recorded.

Once results of the investigations were reviewed, the scope of work was updated to include the 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. A Technical Memo was completed in December 2020 and quarterly sampling continued.

The scope of work was updated to include the installation of an additional five (5) soil vapor pins. Quarterly sampling of soil vapor pins and monthly vac truck events continue, and once the results of the latest quarterly vapor pin results have been received, Global will update the Technical Memo.