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Conceptual Site Model Development and Environmental Molecular Diagnostics

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This was presented at the 2019 Clemson Hydrogeology Symposium. Its full title is Conceptual Site Model Development and Environmental Molecular Diagnostics Use for PlumeStop(R) Liquid Activated Carbon(TM) Application at a Trichlorofluoromethane Groundwater Plume.

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Conceptual Site Model Development and Environmental Molecular Diagnostics

  1. 1. The logo and ANTEA are registration trademarks of Antea USA, Inc. Conceptual Site Model Development and Environmental Molecular Diagnostics Use for PlumeStop® Liquid Activated Carbon™ Application at a Trichlorofluoromethane Groundwater Plume Robert R. Thompson, III, PG, RSM Clemson Hydrogeology Symposium Clemson, SC April 4, 2019
  2. 2. Site Setting Piedmont Geology & Hydrogeology–Remediation Focused on TZ Large Dissolved VOC Plume – 1,200 ft Mass Flux Estimated At 210 kg/year 2 Source Areas: 1. Methylene Chloride, 2. Floor Drains Inside (ongoing) Remediation Since 1992; Antea Group Active Since 2007 50 Acre Manufacturing Facility In North Carolina Since 1960’s
  3. 3. Site Layout and Groundwater Flow Direction Pilot Study Area PlumeStop® Bio Barrier Methylene Chloride Source Area Floor Drain Source Area
  4. 4. Pre-Remedial Design Investigation Passive Soil Gas Survey Surface Resistivity Survey A A’ A A’
  5. 5. 5 What Geochem Data Can Tell You Where the site is on the REDOX ladder What microbial populations are likely dominating If one or more parameter excessive/outside the norm Aids in the refinement of the CSM Critical to troubleshooting poorly performing sites
  6. 6. Pilot Study • Pilot study using DPT • 3,600 lbs. PlumeStop® • 330 lbs. HRC® • Design verification • Soil VOC data • Groundwater data • Soil geotechnical data • One year monitoring, per NCDEQ • State-wide use of PlumeStop® approved • Final Design GW Flow
  7. 7. DO & ORP – February 2019 Dissolved Oxygen – Aerobic Conditions Oxidation-Reduction Potential – Reducing Conditions
  8. 8. Results: Post-Injection Pilot Study Data 0 500 1,000 1,500 2,000 2,500 3,000 0 2 4 6 8 10 12 9/18/2014 4/6/2015 10/23/2015 5/10/2016 11/26/2016 6/14/2017 12/31/2017 7/19/2018 2/4/2019 Freon11(µg/L) PCE,TCE,and1,4-DioxaneConcentrations (µg/L) Date 15 Feet Downgradient From Pilot Study PCE (µg/L) PCE 2L Standard TCE (µg/L) 1,4-Dioxane (µg/L) TCE and 1,4-Dioxane 2L Standard PlumeStop Pilot Study Freon 11 (µg/L) Phase I PlumeStop Injection Freon 11 2L Standard
  9. 9. Results: Post-Injection Pilot Study Data 0 100 200 300 400 500 600 700 800 900 1000 0 20 40 60 80 100 120 140 160 180 200 9/18/2014 4/6/2015 10/23/2015 5/10/2016 11/26/2016 6/14/2017 12/31/2017 7/19/2018 2/4/2019 Freon11and1,4-Dioxane(µg/L) PCEandTCEConcentrations(µg/L) Date PCE (µg/L) PCE 2L Standard TCE (µg/L) TCE and 1,4-Dioxane 2L Standard PlumeStop Pilot Study 1,4-Dioxane (µg/L) Freon 11 (µg/L) Freon 11 2L Standard Phase I PlumeStop Injection 100 Feet Downgradient From Pilot Study
  10. 10. QuantArray-Chlor MW-12S December 2014 (pre-pilot study) MW-12S September 2018 Aerobic (co)metabolic species
  11. 11. Dehalobacter spp. Dehalobacter spp. in Cross-Section GW Flow Direction
  12. 12. Microbial Community Cross-Section GW Flow Direction GW Flow Direction
  13. 13. Total Eubacteria – Phase 2 Area GW Flow Direction
  14. 14. Full Scale Phase 1 PlumeStop® • Largest PlumeStop® application for Freon 11 plume in the world • 32,400 lbs. PlumeStop® applied into injection wells • 5,700 lbs. PlumeStop® applied by DPT • 5,400 lbs. HRC-X® • 5,400 lbs. HRC Primer® • 33 injection well locations • 10 DPT locations
  15. 15. The Chemistry - Tools
  16. 16. Total VOCs October 2012 Total VOCs November 2018 Total VOCs February 2019 Total VOCs November 2014
  17. 17. Results – Post Injection Barrier Area 0 500 1,000 1,500 2,000 2,500 3,000 3,500 0 5 10 15 20 25 30 35 10/13/2013 4/11/2014 10/8/2014 4/6/2015 10/3/2015 3/31/2016 9/27/2016 3/26/2017 9/22/2017 3/21/2018 9/17/2018 3/16/2019 Freon11andTotalVOCs(µg/L) PCE,TCE,1,4-DioxaneConcentrations(µg/L) Date Upgradient -- Downgradient MW-24S PCE (ug/L) MW-24S TCE (ug/L) PlumeStop Pilot Study MW-24S 1,4-Dioxane (ug/L) MW-19S PCE MW-19S TCE MW-19S 1,4-Dioxane MW-24S Freon 11 (ug/L) Phase I PlumeStop Injection MW-24S Total VOCs (µg/L) MW-19S Freon 11 MW-19S Total VOCs Upgradient Downgradient
  18. 18. Groundwater Plume Visualization-Freon 11
  19. 19. 3D Cross Sections Total VOCs - 2014 Freon 11 - 2019 GW Flow Direction GW Flow Direction
  20. 20. Freon 11 Cross Section – February 2019 GW Flow Direction
  21. 21. Summary Robust data collection is needed Data collection during RI pays off in the long run Consider all the tools available for use Performance monitoring is key Field awareness keeps everyone safe Preparedness improves project quality Remedial design leads to surgical placement Consider options that yield results and save funds
  22. 22. Thank You Jack Sheldon Senior Professional, Antea Group Jack.Sheldon@anteagroup.com 515.971.8329 If you don’t have time to do it right the first time, what makes you think you’ll have time (and resources) to do it right the second time? Robert R. Thompson, III, PG, RSM Senior Professional, Antea Group Rob.Thompson@anteagroup.com 704.324.7046 We do more than effectively solve client challenges; we deliver sustainable results for a better future.

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