M-Area Chemical Oxidation (MACO) Demonstration Project

Transcription

1 A Presentation to the Facilities Disposition and Site Remediation Committee Savannah River Site Citizens Advisory Board M-Area Chemical Oxidation (MACO) Demonstration Project P. Casey Knapp MACO Project Lead Area Closure Projects Savannah River Nuclear Solutions, LLC February 9,

2 Purpose To provide the Facilities Disposition and Site Remediation Committee a description and preliminary results of the M-Area Chemical Oxidation Project This is an ARRA funded demonstration - through the first Quarter of Fiscal Year 2010, $750,000 has been spent (includes site preparation through deployment and initial monitoring) -2-

3 Acronyms ARRA American Recovery and Reinvestment Act BU Upper Screen Zone for demonstration wells BL Lower Screen Zone for demonstration wells HAZMAT Hazardous materials IDW Investigation Derived Waste ISCO In-Situ Chemical Oxidation LLC Limited Liability Corporation MACO M-Area Chemical Oxidation mg/l Milligrams per liter msl Mean sea level NaOH Sodium hydroxide Na 2 S 2 O 8 Sodium persulfate PCE Tetrachloroethylene RCRA Resource Conservation and Recovery Act SREL Savannah River Ecology Lab SRS Savannah River Site SRSOC Savannah River Site Operations Center TCE Trichloroethylene ug/l Micrograms per liter -3-

4 MACO Demo Project M-Area Groundwater Operable Unit Resource Conservation and Recovery Act (RCRA) Source Area Demonstration of In-situ Chemical Oxidation Technology Catalyzed sodium persulfate chemical oxidant Known for its effectiveness for dissolved phase solvents such as Tetrachloroethylene (PCE) and Trichloroethylene (TCE) The oxidant provides electrons to convert toxic solvents into non-toxic compounds (i.e., carbon dioxide, hydrogen chloride, etc.) -4-

5 -5- MACO Demo Project South Carolina M Area Par Pond L Lake Site Location M-Area Plume Branch Creek Tim s Tinker Runs Branch Three Upper Fourmile Branch Creek Creek Pen Runs Steel S a v a n n a h R i v e r Three Lower Georgia

6 MACO Demo Project Project Site M-Area PCE / TCE contamination plume Southeast of A-14 Outfall Source Area -6-

7 ft / msl N A-014 Outfall Source Area Injection Well NOT TO SCALE 350 MSB-31 MOP-3 MIP-1C MOP-1 MOP-2 SSM Vadose Zone M Area Aquifer Zone Green Clay Confining Zone 150 Lost Lake Aquifer Zone High Concentration Zone -7-

8 MACO Demo Project Installation of three monitoring wells and one injection well Contract between Savannah River Ecology Lab (SREL) and Redox-Tech, LLC Redox-Tech, LLC - vendor selected based on previous expertise and experience In-Situ Chemical Oxidation (ISCO) a primary scope of services offered by vendor Catalyzed sodium persulfate many successful deployments of this ISCO technique in the commercial arena Offices in Cary, North Carolina and Aiken, South Carolina -8-

9 MACO Demo Project Injected 4,800 gallons of catalyzed sodium persulfate solution into the subsurface Batch injections Approximately 450 gallons of water 990 pounds of sodium persulfate (Na 2 S 2 O 8 - a solid) Approximately 20 gallons of 25 percent sodium hydroxide (NaOH) solution-catalyst Average injection rate = 3 gallons per minute -9-

10 MACO Demo Project Containment Dike Sodium Persulfate Temporary Pallet Storage Primary Exclusion Zone Portable Toilet MOP 003BU MIP 001C Water Truck Injection Trailer MOP 002BU MOP 002BL NaOH Drum Containment MOP 001C MOP 001BU Eye Wash Stations IDW Storage Secondary Exclusion Zone MACO Demo Sign Site layout sketch Injection Well Monitoring Wells Chemical Storage Injection Trailer Eye Wash Station Investigation Derived Waste (IDW) Storage Exclusion Zones SSM 019D SSM 019B SSM 019C M Area - MACO Demonstration Site Layout Access Road -10-

11 Core Sampling Core Extraction Well Drilling Core Logging

12 Overall Site Layout -12-

13 Water Truck and Injection Trailer / Crew -13-

14 -14- ACP-FY Gallon Mixing Tank

15 MACO Demo Project Na 2 S 2 O 8 Na 2 S 2 O 8 Pallet Na 2 S 2 O 8 Fork Lift Fork Lift assisted addition of solid sodium persulfate to mixing tank -15-

16 Injection Well Head Fitting -16-

17 MACO Demo Project Safety precautions Containment structure (dike) with 2,300 gallons of capacity Multiple Eye-Wash Stations with face dousers Maintenance assistance with make-up water, fork-lift operations, air compressor, and chemical delivery to site Hydrostatic pressure test of injection rig In-service leak test with clean water Spill protection and mitigation Containment structure Drum containment lockable clam shell Spill kit (absorbent booms, pillows, and granular absorbentcompatible) ER-ERP-001 Emergency Procedures (Spill Response) Prior notification of Hazardous Materials Spill Response Team (HAZMAT) and Savannah River Site Operations Center (SRSOC) Freeze protection for pumps -17-

18 SREL Monitoring Well Sampling -18-

19 Persulfate Injection Begins 12/10/2009 MOP 1C Preliminary Monitoring Results TCE (mg/l) Persulfate Injection Ends 12/21/ /08/09 12/13/09 12/18/09 12/23/09 12/28/09 01/02/10 01/07/10 01/12/10 01/17/10 Sample Date -19-

20 8 MOP 1BU Persulfate Injection Begins 12/10/2009 Preliminary Monitoring Results TCE (mg/l) Persulfate Injection Ends 12/21/ /10/ /15/ /20/ /25/ /30/2009 1/4/2010 1/9/2010 Sample Date -20-

21 Summary / Path Forward Attention to safety resulted in all work performed safely - no incidents Injections were completed within a two-week period Initial monitoring results show success in the destruction of PCE and TCE Groundwater monitoring will continue for several months to measure the effectiveness of the demonstration -21-