Batavia, IL - TCE Remediation at Former Manufacturing Facility Brochure

BAT09 ShortV ProjEx 121610 acf.docx TCE Remediation at Former Manufacturing Facility Confidential Client - Batavia, IL Project Summary TRS Group, Inc. (TRS) has completed a Standard Fixed Price Remediation (SFPR) of trichloroethene (TCE) in soil. Additional contaminants of concern (COCs) included cis-1,2-dichloroethene (DCE) and vinyl chloride (VC) in soil using Electrical Resistance Heating (ERH) at a confidential site located in Batavia, IL. The site was remediated to residential usage levels to support plans for redevelopment in the next year. Construction was performed during the winter months to meet the clients’ schedule. One hundred and forty-three electrodes were installed using common drilling techniques to target discrete contamination intervals to ensure efficient energy use and effective remediation. Average concentrations of TCE, cis-DCE, and VC decreased over 99% in the ERH treatment area following treatment. Twenty-three out of the forty samples were below laboratory detection levels. Soil vapor and steam capture was complete throughout ERH system operations and site, staff, and public safety were maintained at all times. Background The site parcel is approximately 9 acres in size and surrounded by a residential community. The facility was completely razed as of May 2009. The site operated as a manufacturing plant from 1938 to May 2000. The manufacturing process included metal fabrication, plating, plastic molding, painting and etching. Site Characteristics & Design Parameters The regional geology is composed of various glacial and bedrock units. Unconsolidated sediment units are find-grained in nature (silt and clay) with local lenses of silt, sand and gravel. Four major water bearing systems in the region include glacial drift, shallow bedrock, the Cambrian-Ordovician and Mt. Simon aquifer systems . The Glenwood-St. Peter, Ironton-Galesville and Mt. Simon Sandstones are the major deep aquifers capable of producing water. Groundwater is typically found at 20 feet below grade surface (bgs). TCE is the primary contaminant of concern in the remediation area but this project also involves remediation of DCE and VC. Table 1 below shows initial concentration of the COCs, results and remedial goals for each contaminant. These results are also shown graphically in Figure 1. Table 1 - Pre- and Post-ERH CVOC Results (µg/kg) TCE DCE VC Pre ERH Concentrations Avg. 2,736 879 47 Max. 120,000 21,000 1,700 Post ERH Concentrations Avg. 10 9 0 Max. 150 130 4 Percent Reduction 99.63% 99.02% 99.72% Remedial Goal 192 698 17 The initial proposed remedy for contamination reduction at the Site was excavation with off-site disposal with no engineered barriers or institutional controls. This active remedy was subsequently altered to include ERH. The ERH treatment area encompassed the majority of the originally planned excavation footprint at the Site. Details for the various subareas that comprised the ERH treatment area are provided in Table 2 below. BAT09 ShortV ProjEx 121610 acf.docx ©2010, TRS Group, Inc. All rights reserved. Table 2 – Treatment Regions Region Treatment Area (sq ft) Avg. Depth Interval (ft bgs) Volume (yd3) Area 3A (shallow) 1,547 0.5 – 18 1,000 Area 3A (remaining) 23,105 5 – 18 11,100 Area 3B 991 5 – 18 500 Area 4A 970 0.5 – 12 400 Area 4B 1,478 0.5 – 20 1,100 Area 5 1,093 0.5 – 13 500 Total 29,184 14,600 System Construction/Operations TRS installed 143 electrodes with co-located vapor recovery points throughout the treatment area. Additional 143 shallow vapor recovery wells were installed to ensure vapor capture from various subsurface heterogenatites. Twenty-four temperature data locations with an average of four thermocouples each were used to track the treatment progress. The system installation included vapor recovery, electrode wiring, electrode water addition and communications installation. The ERH system operated for 147 days, with an average subsurface temperatures increased at a rate of 1.5 degrees Celsius (ºC) per day during treatment. Results Confirmatory soil sampling performed on June 2 and 3, 2010 included the analysis of 40 soil samples collected from 20 sampling locations. Average concentrations of TCE, cis-DCE, and VC decreased over 99% in the ERH treatment area following treatment. Twenty-three out of the forty samples were below laboratory detection levels. Soil vapor and steam capture was complete throughout ERH system operations and site, staff, and public safety were maintained at all times. Summary TRS Project Manager Mr. Chris Thomas TRS Project Engineer Mr. Brandon Bruns Site Geology and Hydrology Silty clay. Groundwater, 20-ft bgs Treatment Area Size, Volume, and Depth 29,184 ft2; 14,600 yd3; 0.5 to 20-ft bgs Beginning Maximum Contaminant Concentrations 120 mg/kg TCE ; 21 mg/kg DCE; 0.74 VC in soil Remedial Goal(s) 0.192 mg/kg TCE ; 0.698 mg/kg DCE; 0.017 VC in soil Period of Performance February - July 2010; 147 days of operation Contract Terms Standard Fixed Price Remediation TRS Contact Information Mr. David Fleming, (425) 396-4266, dfleming@thermalrs.com, www.thermalrs.com Figure 1 – ERH Treatment Performance Summary