Central United States
Phase II Environmental Site Assessment
Confidential Acquisition Candidate
Rock Island, Illinois
ETG was retained by a S&P 500 industrial conglomerate to perform a limited Phase II ESA to assess and evaluate the recognized environmental conditions previously identified in the Phase I ESA of the facility. Because of the close proximity of a release site of 1,1,1-trichloroethane (1,1,1 TCA) and of the potential for impact to groundwater beneath the property, ETG recommended the installation of temporary wells and the collection and analysis of groundwater from the temporary wells. During the Phase II ESA, five, small diameter (3/4 inch) wells were installed along the Inpro/Seal property boundaries using Geoprobe® direct-push technology. Additionally, eight subsurface soil borings were advanced through the concrete floor of the machining area of the facility where oil/coolant had been observed flowing into cracks and expansion joints. A total of 10 soil samples were collected from the eight borings. Additionally, two of these soil borings were completed as temporary wells. Groundwater samples from under the building were collected from these two locations. Soil and groundwater samples were analyzed for the 13 priority pollutant metals, semi-volatile organic compounds (SVOCs), total petroleum hydrocarbons (TPH), and VOCs. TCE was detected in two soil samples at concentrations that exceeded the USEPA Regions 3, 6, and 9 Regional Screening Levels (RSLs). ETG recommended that additional site characterization be conducted to determine the full extent of subsurface impact of TCE. Additionally, an evaluation of the physical properties of the subsurface materials for potential in-situ remediation alternatives was suggested by ETG.
Phase II Limited Subsurface Investigation
Confidential Industrial Client
A previous Phase I ESA conducted at the site found evidence of potential petroleum hydrocarbon and solvent contamination west of the main facility building. ETG personnel performed a more thorough site characterization assessment to determine the actual horizontal and vertical limits of potential contamination at the site. ETG supervised the excavation of several exploratory trenches throughout the area of concern and collected soil samples for chemical analysis. Samples were analyzed for diesel range organics (TPH-d) VOCs, SVOCs, and USEPA priority pollutant metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver). Chemical analysis found a small area of soil was impacted with organic compounds and metals. ETG personnel supervised the removal of contaminated soil and obtained samples following the excavation of soil. Following soil excavation, samples indicate that the soil remaining at the site is below the applicable USEPA and Texas Commission on Environmental Quality (TCEQ) screening levels for all of the constituents of concern.