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JB Charleston Tier I Partnering December 4, 2013

Groundwater Monitoring Multiple UST Sites JB Charleston Weapons, SC Joint Base Charleston Weapons, SC. JB Charleston Tier I Partnering December 4, 2013. Scope of Work. 10 UST Sites: 4 RCRA Program and 6 UST Section UST QAPP Addendums (Approved in October 2013)

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JB Charleston Tier I Partnering December 4, 2013

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  1. Groundwater Monitoring Multiple UST Sites JB Charleston Weapons, SCJoint Base Charleston Weapons, SC JB Charleston Tier I Partnering December 4, 2013

  2. Scope of Work 10 UST Sites: 4 RCRA Program and 6 UST Section UST QAPP Addendums (Approved in October 2013) Field Activities (Completed in November 2013) • Well Gauging for depth to groundwater/free product • Well Sampling • BTEX, MTBE, and naphthalene all wells • nitrate, sulfate, ferrous iron, and methane Well Survey is 90 % complete and scheduled for completion in December 2013 Ongoing reporting to include Draft Submittals to USACE and Installation in December 2013

  3. Schedule of Activities

  4. 2013 Notable Field Observations Free Product Detected at 2 Sites • AOC B-3 (Former Bldg 7) – Two Wells • MW-2 – 1.22 feet • Mw-5 – 0.49 feet • AOC B-5 (Former Bldg 324) – One Well • Mw-3 – 0.18 feet Historical Free Product Detections:

  5. AOC B-3 Site Location

  6. AOC B-3 Historical Details 4,000 gal. Diesel UST • Excavated in 1998 • Assessment in 2002 • MNA Since 2003 Groundwater • LNAPL removal at MW-1 • AFVR through 2006 • 2012 Exceedances: • Benzene (MW-1) and Naphthalene (MW-1, MW-2, & MW-5) • East-Northeast Groundwater Flow • Depth to Water: • 10.8’ - 12.1’ in 2013 versus 11.9’ - 14.5’ in 2012 • Contamination Confined to Within Site Boundaries

  7. AOC B-5 Site Location

  8. AOC B-5 Historical Details 1,000 gal. fuel oil UST • Excavated in 2002 • Assessment in 2002 and 2004 • MNA Since 2005 Groundwater • LNAPL removal at MW-3 • 2012 Exceedances: • Naphthalene (MW-3) • West-Southwest GW Flow • Depth to Water: • 3.4’ - 5.1’ in 2013 versus 2.1’ – 4.0’ in 2012 • Contamination Confined to Within Site Boundaries

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