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March 2018 FNOD RAB Meeting ºÝºÝߣs

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Norfolk District, U.S. Army Corps of Engineers
Norfolk District, U.S. Army Corps of Engineers

The US Army Corps of Engineers provided an update on environmental and munitions investigations at the former Nansemond Ordnance Depot TNT Source Area 1 site. Geophysical surveys identified over 3,500 anomalies, with a high concentration in one 0.4 acre area. The contractor will intrusively investigate anomalies to identify any subsurface munitions for proper disposal. Upcoming reports will provide further details on the extent of groundwater and soil contamination and recommendations based on data gap investigations and a feasibility study currently underway.

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US Army Corps of Engineers BUILDING STRONG® Nansemond Ordnance Depot Formerly Used Defense Sites (FUDS) TNT Source Area 1 Update Environmental & Munitions Design Center Baltimore District, USACE RAB Meeting March 1, 2018 Baltimore District Office Baltimore, MD
BUILDING STRONG® FNOD and TNT Site Boundary
BUILDING STRONG® HTRW Data Gap  Data Gaps were collected from October 2014 through November 2016  Data collected to define the extent of the plume and support Feasibility Study (FS)  Data Gap report will be an addendum to FS report  Draft for internal review in mid-March 2018
BUILDING STRONG® MEC Data Gap  Contractor- Weston  Field work was conducted from November 27 through December 2017 by Baltimore and Weston team  Purpose: To verify that all past munitions removal actions have successfully removed MEC at TNT area and make a recommendation for further action if warranted
BUILDING STRONG® Historical Features Location Map
BUILDING STRONG® EM61 Findings
BUILDING STRONG® E 31Findings
BUILDING STRONG® EM 31 Targets
BUILDING STRONG® Geophysical Results  EM 31 ► Larger features most likely associated with well pad, 4 red dots along the western boundary indicate light post, wells, signs and green dots represent trees  EM 61 ► 3559 total anomalies during EM61 survey ► EM61 saturated area contains 788 anomalies in 0.4 acres. This is a target density of 1679 anomalies per acre. 20% of the 3559 anomalies are located in this area
BUILDING STRONG® Action Plan for Weston  Intrusive Investigation/Sub-Surface Clearance ► Intrusively investigate these areas to determine and verify the location of subsurface material. Items identified during the survey shall be inspected and properly disposed  Recommend Further Action if MEC was found??
BUILDING STRONG® In coming reports for review  Data Gap investigation report which identifies the extent of groundwater and soil contamination at the TNT and soccer field- Further recommendation for MEC. This report will be an addendum to FS  Feasibility Study for Groundwater and Soil (underway by Weston)

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March 2018 FNOD RAB Meeting ºÝºÝߣs

  • 1. US Army Corps of Engineers BUILDING STRONG® Nansemond Ordnance Depot Formerly Used Defense Sites (FUDS) TNT Source Area 1 Update Environmental & Munitions Design Center Baltimore District, USACE RAB Meeting March 1, 2018 Baltimore District Office Baltimore, MD
  • 2. BUILDING STRONG® FNOD and TNT Site Boundary
  • 3. BUILDING STRONG® HTRW Data Gap  Data Gaps were collected from October 2014 through November 2016  Data collected to define the extent of the plume and support Feasibility Study (FS)  Data Gap report will be an addendum to FS report  Draft for internal review in mid-March 2018
  • 4. BUILDING STRONG® MEC Data Gap  Contractor- Weston  Field work was conducted from November 27 through December 2017 by Baltimore and Weston team  Purpose: To verify that all past munitions removal actions have successfully removed MEC at TNT area and make a recommendation for further action if warranted
  • 9. BUILDING STRONG® Geophysical Results  EM 31 â–º Larger features most likely associated with well pad, 4 red dots along the western boundary indicate light post, wells, signs and green dots represent trees  EM 61 â–º 3559 total anomalies during EM61 survey â–º EM61 saturated area contains 788 anomalies in 0.4 acres. This is a target density of 1679 anomalies per acre. 20% of the 3559 anomalies are located in this area
  • 10. BUILDING STRONG® Action Plan for Weston  Intrusive Investigation/Sub-Surface Clearance â–º Intrusively investigate these areas to determine and verify the location of subsurface material. Items identified during the survey shall be inspected and properly disposed  Recommend Further Action if MEC was found??
  • 11. BUILDING STRONG® In coming reports for review  Data Gap investigation report which identifies the extent of groundwater and soil contamination at the TNT and soccer field- Further recommendation for MEC. This report will be an addendum to FS  Feasibility Study for Groundwater and Soil (underway by Weston)