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Mario Dumenigo Naval Facilities Engineering Command

Navy Involvement with Perchlorate Issues and an Overview of Activities at Naval Weapons Industrial Reserve Plant McGregor, Texas. Mario Dumenigo Naval Facilities Engineering Command. Naval Uses of Perchlorate. Rocket Motors Tactical and Strategic Mines Torpedoes.

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Mario Dumenigo Naval Facilities Engineering Command

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  1. Navy Involvement with Perchlorate Issues and an Overview of Activities at Naval Weapons Industrial Reserve Plant McGregor, Texas Mario Dumenigo Naval Facilities Engineering Command

  2. Naval Uses of Perchlorate • Rocket Motors • Tactical and Strategic • Mines • Torpedoes

  3. Navy Involvement with the DoD Perchlorate Work Group • AF Designated as DoD Lead Agency for Perchlorate • Coordinate Perchlorate Efforts • Recommend Policy • Navy has representatives on the Work Groups

  4. Naval Sites with Perchlorate Allegany Ballistics Laboratory,WV NSWC Indian Head Division, MD OLF San Nicolas Island, CA MCAS El Toro, CA NWIRP McGregor, TX

  5. Site History • Operated for More Than 50 Years Under Various Owners and Tenants • United States Army, Navy, and Air Force • Industrial Activities: • Weapons and Weapons Systems • Bombs, Missiles, and Explosives • Solid-fuel Rocket Propulsion Systems • Ammonium Perchlorate

  6. Site History

  7. Site History • Ongoing RCRA Facility Investigation • Soil, Surface Water, and Groundwater • Gray Area Investigation • Based on Environmental Baseline Study Results • Groundwater Investigation

  8. Perchlorate Characterization • Texas Regulatory Issues/Limits • Drinking and Surface Water: 22 ppb • Texas Risk Reduction Program (TRRP) • Soil (protective of groundwater) : 270 ppb • TRRP: Tier I Commercial/Industrial Soil Protective Concentration Limits (PCL) • Groundwater: 66 ppb • TRRP: Commercial/ Industrial Standards Groundwater PCL

  9. Areas of Environmental Concern • Area M: 750-acre Watershed • Onsite Perchlorate Concentrations • Surface Water at Property Line: 5,600 ppb • Groundwater: 4 to 91,000 ppb • Springs: 22,000 ppb • Drainage Pathway • Onsite Discharge to Unnamed Tributary • Station Creek • Leon River/Lake Belton • Drinking Water Intake

  10. Interim Stabilization Measures • Why ISMs? • Migration of Perchlorate-contaminated Groundwater and Surface Water from Site • Action Letter from the TNRCC (2/99) Requiring Migration Abatement • Treatment Technology Evaluation • Bench-scale Studies • Pilot-scale Studies

  11. Bench-Scale In Situ Study • Objective: Evaluate in Situ Treatment of Perchlorate-contaminated Groundwater • Permeable Reactive Barrier (PRB) • PRB Media Evaluation • Experimental Approach • Plastic Bioreactors (Same As GW) • Influent Concentration: 5,000 to 8,000 ppb • Flow Rates Similar to Groundwater

  12. Bench-Scale In Situ Study Compost Oil-coated Wood Shavings Cotton Seed GAC

  13. ISM Selected Strategies • Groundwater Cutoff and Collection Trenches • In situ Groundwater Biotreatment • Soil Biotreatment

  14. Cutoff/Collection Trench Construction • ISM Design Goals • Abate Offsite Migration of Perchlorate-Contaminated Groundwater and Surface Water • Interception and Collection in Trenches • In-Situ Bioremediation

  15. POSSIBLE SOURCE AREA C-LINE TRENCH UNNAMED TRIBUTARY B-LINE TRENCH A-LINE TRENCH Cutoff/Collection Trench Construction

  16. Cutoff/Collection Trench Construction • A-line Property Line Cutoff Trench • Extends through Weathered Limestone Water-bearing Zone • 30 Inches Wide • Up to 25 Feet Deep • Perforated Collection Pipe • Drainage Aggregate

  17. Cutoff/Collection Trench Construction

  18. Cutoff/Collection Trench Construction

  19. Collection System Modification UNNAMED TRIBUTARY

  20. Collection System Modification

  21. Collection System A-line Trench B-line Trench C-line Trench

  22. Soil Treatment System

  23. Emergency Order Originally no discharge allowed Allowed discharged at 22 ppb as of 5/01 Should be in effect until TPDES permit is issued Winter Rains 200% Above Normal Higher GW flow than expected, Electron Donor Amendment 22 million gallons stored during period of no discharge Additional ISM Issues

  24. Site Costs and Cost Savings • ~$10 Million for Area M to Date • Includes Site Investigations • Bench and Pilot Studies of Different Treatment Systems • Full Scale Implementation • Cost Avoidance • ~$3 Million in Capital Costs Compared to Existing Technologies • ~$95 Thousand per Year in O&M

  25. NWIRP McGregor Successes • Successful partnering initiative • TNRCC and USEPA • Fast Track Implementation • Seamless Relationship between CLEAN and RAC Contractors • Created an Avenue to Educate and Distribute Information to the Community and Stakeholders

  26. NWIRP McGregor Successes • Pilot-scale Treatment System used as Remedy • Innovative In situ Treatment System Rendered Ex situ System Unnecessary at NWIRP McGregor • Before Pilot-scale Study • Interim Stabilization Measure Cost Savings

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