|Client:||Leggett & Platt Inc.|
|Budget:||$150,000 (for multiple Phase II ESA Investigations)|
XCG was retained by Leggett & Platt Inc. (LPI) to conduct Phase I and Phase II Environmental Site Assessments (ESAs) at the former Leggett & Platt Canada facility. The work was completed as part of a due diligence process undertaken by LPI prior to the sale of the site. The Phase I ESA activities identified that releases from a former solvent underground storage tank resulted in impacts to soil and groundwater at the site. It appeared that despite the efforts undertaken by the previous owner to remediate the site, releases from the former solvent UST resulted in impacts to soil, groundwater, and storm sewer effluent.
Iterative Phase II ESA Investigation
Based on the findings of the Phase I ESA, Phase II ESA activities were conducted and completed in three stages, which were focused on the assessment of groundwater quality, delineation of groundwater impacts, and investigation of the source of on-site impacts. The activities included advancement of boreholes, installation of overburden and bedrock monitoring wells, installation of soil vapour probes inside the on-site building, collection of soil, groundwater, soil vapour, and storm sewer effluent samples, and, storm sewer video inspections.
Based on the Phase II ESA, XCG concluded that although releases from the former solvent UST resulted in some impacts to soil, groundwater and storm sewer effluent, the majority of the on-site groundwater impacts were caused by the migration of volatile organic compound (VOC)-impacted groundwater from an off-site source located west/northwest of the site. Although the Phase II ESA activities did not identify any evidence that impacted groundwater discharged from the site, it determined that impacted groundwater was infiltrating into the on-site storm sewer.
Targeted Remediation/Storm Sewer Replacement
Targeted sewer remediation works, completed between December 2006 and February 2007, included installation of monolithic manholes and catch basins, abandonment of old lateral drains and replacement of existing leaky connections with watertight ones. Sewer remediation work completed by XCG virtually eliminated infiltration of groundwater to the section of sewer located along the west (upgradient) property boundary and improved the overall quality of the sewer effluent discharging from the site.