During September 2017 Warmington Residential completed a series of bioremediation injections into the groundwater beneath the property to accelerated the reduction of TCE concentrations. Groundwater samples were obtained from five new monitoring wells and three existing wells, prior to the injections, to determine the baseline TCE concentrations. Groundwater samples were collected in December 2017 and March 2018 at 3 months and 6 months after the injections were completed to assess the effectiveness of the enhanced bioremediation. At 3 months and 6 months the TCE concentrations were significantly reduced. The baseline, 3 months, and 6-month groundwater monitoring results can be viewed here. A second bioremediation injection is planned in May 2018 to target a high TCE groundwater area in the southwestern portion of the property.
TCE in the shallow groundwater volatilizes and migrates into the soil in the form of TCE Soil Gas Vapor. During September 2017 Warmington Residential initiated operations to reduce the high TCE soil gas concentrations in the soil through Soil Vapor Extraction (SVE). 37 soil vapor extraction wells and 14 soil gas monitoring wells were installed at the property. Baseline soil gas samples were taken from the monitoring wells prior to the start of the soil vapor extraction and treatment system. After 8 weeks of operations, the SVE systems were shut down and rebound testing was conducted at intervals of 1 week, 3 weeks, 2 months and 3 months. The soil gas test results can be viewed here. SVE operations will continue through mid-June 2018 to target the remaining high TCE soil gas concentration areas in the southern portion of the property.