Long-Term Stewardship of Three Evapotranspirative Covers, 15 years - - PowerPoint PPT Presentation

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Long-Term Stewardship of Three Evapotranspirative Covers, 15 years - - PowerPoint PPT Presentation

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August 20 23, 2018 Grand Junction, Colorado 2018 Long-Term Stewardship Conference Long-Term Stewardship of Three Evapotranspirative Covers, 15 years Sue Collins, Long-Term Stewardship Program Lead Sandia National Laboratories Track 2.2:

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2018 Long-Term Stewardship Conference

August 20–23, 2018 Grand Junction, Colorado

Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions

  • f Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear

Security Administration under contract DE-NA0003525.

Long-Term Stewardship of Three Evapotranspirative Covers, 15 years

Sue Collins, Long-Term Stewardship Program Lead Sandia National Laboratories

Track 2.2: Understanding the Post-Closure Changes of Engineered Disposal Cell Covers, Part 1

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Other Contributors

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Michael M. Mitchell GRAM, Inc. Robert Ziock Sandia National Laboratories

2018 LTS Conference

Dedication: To Mike and Robert who have remained with all 3 covers since design and construction To their invaluable knowledge and earnest stewardship Acknowledgement: NNSA 533: Richard Dasher and Tom Longo (retired) NNSA Sandia Field Office: Steve Black and David Rast Cover Tour Video SAND2018-8211V by John Sandlin, Sandia National Laboratories Environmental Geographic Information System Intern

Presentation SAND2018-6824C

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Cover Tour

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TIM IMELIN INE FOR 3 EVAPO-TRANSPIR IRATIV IVE COVERS AT SANDIA IA NATIONAL LABORATORIES

1997 1997 1998 1998 1999 1999 2000 2000 2001 2001 2002 2002 2003 2003 2004 2004 2005 2005 2006 2006 2007 2007 2008 2008 2009 2009 2010 2010 2011 2011 2012 2012 2013 2013 2014 2014 2015 2015 2016 2016 2017 2017 2018 2018

CWL Vapor Extraction CWL Backfill Phase 1 CWL ET Cover Construction CWL Landfill Excavation CWL Backfill Phase 2 MWL Subgrade Construction MWL ET Cover Construction MWL Inspection and Maintenance CAMU Excavate the Fill Area

Corrective Action Management Unit (CAMU) Chemical Waste Landfill (CWL) Mixed Waste Landfill (MWL)

Treated CWL Waste Soils Into CAMU CAMU ET Cover Construction CAMU Inspection and Maintenance CWL Inspection and Maintenance

ET Cover Maintenance since 2003

  • 2003 Corrective Action Management Unit (CAMU)
  • 2005 Chemical Waste Landfill (CWL)
  • 2009 Mixed Waste Landfill (MWL)
  • Size Range: 2.2 – 4.1 acres
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Top Soil: 0.7-1.5ft Native Soil: 2.5 - 3ft Local Soils from <1.5 miles away Soils Prepared/Screened/Tested on Site ET Design: ~9x ABQ’s Average Annual Precipitation Bio-intrusion Layer 1.25 ft Filter Sand Pea Gravel 0.7 ft Backfill of Clean Fill Soil Replaceable Soil Subgrade Bedding Sand Original unexcavated Landfill Treated Soils Stored in Lined RCRA C MWL CAMU

CWL

ET Cover Layers

Custom Seed Mix Biointrustion Crushed Rock 1 – 6 inch, no organics or friable fragments

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ET Cover Construction at Chemical Waste Landfill

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Seed Mix Changes and Gravel Mulch

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Seeds for CWL Mix Rate Indian Rice Grass 39% 7.8 lbs/acre Galleta 19.5% 3.9 lbs/acre Blue Grama Grass 29.5% 5.9 lbs/acre Sand Dropseed 6% 1.2 lbs/acre Alkai Sacaton 6% 1.2 lbs/acre

Corrective Action Management Unit, 2005 Minor seed mix adjustments for MWL and Increased the Seed Rate.

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Chemical Waste Landfill

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Seed mix Seeding Mulching, Crimping Prevent Wind Erosion

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Supplemental Watering was needed for 2 of the 3 covers Achieve Vegetation Specification within 5 years

Mixed Waste Landfill

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1-2 years Heavy Weed Coverage

Mixed Waste Landfill

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Inspection and Maintenance

Permits Requirements

  • Quarterly Inspections
  • Maintenance within 60 calendar days
  • Maintenance Summary Reports

Operations

  • Sandia LTS staff perform Inspections
  • Maintenance Subcontract
  • Lesson Learned: Standard ‘Facilities’ services and practices, not a fit
  • Ordering Agreement: Small Business – Environmental (NAICS 562910)
  • Satisfies Grass Maintenance Needs
  • Satisfies Reporting Needs
  • Satisfies Compliance Timeliness

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Chemical Waste Landfill December 2016

Mature Covers Primary Maintenance:

  • Clearing Fences of Wind-

Blown Weeds

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Buffer Area: Herbicide 3 ft outside Perimeter Only 1 Pre-emergent Herbicide Application at CWL Scheduling Preventive Maintenance

Chemical Waste Landfill Corrective Action Management Unit

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Mixed Waste Landfill: June 2016 Chemical Waste Landfill: July 2017

Mature Cover: Still Hand-Pulling Weeds, But Fewer Weeds Hand-Raking Grass Clumps

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Best Practices Erosion Controls

Mixed Waste Landfill 2018 Mixed Waste Landfill 2016

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