Technical Memorandum 1 Unit 28 Remedial Action Unit 28: 107 - - PowerPoint PPT Presentation

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Unit 28 Technical Memorandum

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Unit 28 Remedial Action

• Unit 28: 107 acres
• Fieldwork completed in June 2017
• 212 MEC items recovered (See MEC Recovery Table)

• Extreme terrain within Unit 28 presented fieldwork challenges

– Surface MEC Removal: 90 acres complete (12 acres inaccessible) – Digital Geophysical Mapping: 63 acres complete (39 acres inaccessible)

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Unit 28 Inaccessible Areas

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Unit 28 Sensitive Fuze Type Munitions

• 119 sensitive fuze type munitions
• Portion of the southern third of the unit recommended for additional

evaluation (See Figure 6)

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Unit 28 Joint Inspection Results

• BLM-Army Joint Inspection performed July 2017
• Areas such as erosion features and Impossible Canyon Road reroute may

require subsurface MEC removal

• Remedial objectives have been met for Unit 28
• Likelihood of surface MEC remaining in inaccessible acreage is low
• No additional surface MEC remediation is recommended
• Recommended evaluation of potential for munitions with sensitive fuzes to

remain in the shallow subsurface in Unit 28 “area of concern”

• Unit 28 will be included in 2018 annual surface monitoring

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Technical Memorandum Summary

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Track 3 Surface Area Monitoring Reports

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Objectives

• Comply with Track 3 ROD
• Address potential changes in site conditions due to erosion
• Monitor units/areas until vegetation growth is sufficient to minimize erosion

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Procedures

• Monitor one percent, at minimum of all units/areas in the program
• Enhanced surface monitoring in all units/areas with high

subsurface anomaly density and UXO with sensitive fuzes

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Surface Monitoring Program Summary

2017 Additions

• Unit 23
• Unit 5A
• Unit 9

2018 Additions

• Unit 25
• Unit 28
• Recommended continue monitoring in all units/areas except Units 4 and 34
• 2018 Surface Monitoring scheduled for Spring