Greensburg, IN - TCE PCE in Soil and Bedrock under Active Facility Brochure

TRS GRE07 ShortV ProjEx 071409 acf TRS Contact InformationMr. David Fleming, (425) 396-4266, dfleming@thermalrs.com, www.thermalrs.comGuaranteed Fixed Price Remediation of TCE, PCE and VC in Soil and Bedrock under anActive Manufacturing Facility Confidential ClientGreensburg, INProject SummaryTRS Group, Inc. (TRS), as a subcontractor to St. John,Mittelhauser and Associates (SMA) provided a guaranteed fixedprice remediation of trichloroethene (TCE), tetrachloroethene(PCE) and vinyl chloride (VC) in soil using Electrical ResistanceHeating (ERH) at a confidential site located in Greensburg, IN. Unique aspects of this project included:1. Operation of one ERH system to treat four distinct andseparate source areas. 2. Design of eleven different custom electrodes to match thecontaminant profile in the four treatment areas. 3. The contaminants of concern extended into bedrock in two ofthe source areas, requiring an electrode design and installationtechnique to treat the overburden soil and bedrocksimultaneously.4. Half of the system was installed under an active manufacturingfacility.The total treatment volume was 20,611 cubic yards. The entireERH system was installed in four months. The full systemoperated for six months and achieved the guaranteed remediationgoals. The remedial goals at the site were to reduce TCE and VCsoil concentrations to the 95% upper confidence limit (UCL) of 13 mg/kg and 1 mg/kg, respectively. The PCE remediation goalwas 23.8 mg/kg in soil.BackgroundThis active manufacturing facility is located in Greensburg, IN. Thefour ERH treatment areas were identified as: the North WestDegreaser (NWD); the North East Degreaser (NED); the TCEAboveground Storage Tank (AST); and the Used CoolantUnderground Storage Tank (UST). While PCE was present atelevated levels in the UST area, and all four treatment areascontained measurable amounts of TCE breakdown products (i.e.VC and cis-1,2-dichloroethene), TCE was the primary contaminantof concern at the site.Site Characteristics & Design ParametersThe total treatment area was approximately 26,436 square feet.The depth of active subsurface heating varied not only betweenthe four treatment areas, but also within the treatment areas. Thelargest heating interval extended from 2 to 38-ft below gradesurface (bgs), while the average heating interval extended from 7to 28-ft bgs. The resulting target remediation volume wasapproximately 20,611 cubic yards. The site lithology in theremediation area consisted of clay with sand lenses to 30-ft bgs.Dolomite bedrock was encountered at 30-ft bgs. Groundwater wasencountered, on average at 17-ft bgs.System ConstructionThe ERH system included 133 electrodes with co-located vapor recovery (VR) wells. Thirty-five of the electrodes were installed usingSonic Drilling techniques and extended into the bedrock (Figure 1). Fifty electrodes were installed within the active facility using a limitedaccess drill rig (Figure 2). Figure 1. Mini Sonic Drilling Technique Figure 2. Limited Access drilling in the NED© 2009, TRS Group, Inc. All rights reserved.TRS GRE07 ShortV ProjEx 071409 acf TRS Contact InformationMr. David Fleming, (425) 396-4266, dfleming@thermalrs.com, www.thermalrs.comThe remaining electrodes were installed using hollow stem auger drilling. Ninety percent of the electrode installations were completedabove grade. All conveyance piping and electrode cabling were routed below grade or along walls to keep storage areas open, andmaintain the facility personnel and vehicle traffic routes. The completed outdoor UST installation is shown in Figure 3 and the completedindoor NWD installation is shown in Figure 4.OperationsThe ERH specialty equipment from the TRS fleet included: one custom-manufactured 2,000-kW Power Control Unit (PCU) for continuouspower delivery to the treatment volume; one 40-horsepower blower for vapor recovery; and, one condenser to separate water from therecovered vapor. Granular Activated Carbon (GAC) was used for vapor treatment to remove volatile organic compounds from the airstream. ERH operations began on September 9, 2008 and were completed by April, 2009. Once soil sampling performed in December 2008confirmed that 80% of the treatment areas had met the remediation goals, the energy in these areas was halted and redirected into theremaining 20% of the treatment areas. The remaining areas were remediated between January 2009 and April 2009.Project ResultsThe confirmatory soil sampling program included the analysis of204 soil samples collected from 71 locations. Post-ERH samplingconfirmed that the site closure 95% UCL criteria for TCE soil hadbeen met or exceeded in all four treatment areas. Theremediation goals for VC and PCE were also met. The averageand 95% UCL results for TCE in soil are shown in Figure 5. During system installation, and prior to operations, the floor slaband walls of the facility were surveyed and mapped for cracks. Atthe conclusion of the ERH project, the building was examinedagain, and no changes in building conditions were observed.Figure 3. Completed UST Area Figure 4. Completed NWD AreaFigure 5. Pre- and Post-ERH Average and 95% UCL TCE in SoilSummaryTRS Project Manager: Mr. Chris ThomasTRS Project Engineer: Mr. Eric MakiSite Geology and Hydrology: Clay with Sand lenses to 30-ft bgs. Dolomite bedrock below 30 ft-bgs; Groundwater on average 17-ft bgsTreatment Area Size, Volume, and Depth: 26,436 ft2; 20,611 yd3; and average 7 to 28-ft bgsBeginning Maximum Contaminant Concentrations: 1,400 mg/kg TCE; 560 mg/kg PCE in soilRemedial Goal(s): TCE concentrations less than the 95% UCL of 13 mg/kg. VC concentrations less than the 95% UCL of 1 mg/kg. PCE concentrations less than 23.8 mg/kgActual Cleanup Achieved: Averages - 2.6 mg/kg TCE; 0.17 PCE; and 0.70 VC in soilPeriod of Performance: 80% September – December 2008 and remaining 20% January - April, 2009 Contract Terms: Guaranteed Fixed Price Remediation© 2009, TRS Group, Inc. All rights reserved.