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19 August 2014

Summary of Conceptual Design Site 3 Causeway Landfill Culvert Stabilization Marine Corps Recruit Depot Parris I sland (CTO JM38). 19 August 2014. BACKGROUND. Causeway provides vehicular access to Marine Corps Recruit Depot Parris Island

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19 August 2014

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  1. Summary of Conceptual DesignSite 3 Causeway Landfill Culvert StabilizationMarine Corps Recruit Depot Parris Island (CTO JM38) 19 August 2014

  2. BACKGROUND • Causeway provides vehicular access to Marine Corps Recruit Depot Parris Island • Causeway constructed over closed landfill (Site 3), with Land Use Controls in place

  3. BACKGROUND • Sinkholes noted above two sets of concrete culverts beneath the 3rd Battalion Causeway

  4. POTENTIAL REMEDIES TO BE CONSIDERED • Partial Excavation of Problem Areas/Depths • Injection of Expanding Polyurethane Grout (from above and/or from within) • Installation of Engineered Lining System • Some Combination of Various Remedies Conducted limited pre-design investigation in March 2014 for additional information to select remedy

  5. LIMITED PRE-DESIGN INVESTIGATIONMARCH 2014 • Geophysical Survey FINDINGS • 2 Types of Anomalies Detected • Immediately above culverts = very loose soils, representative of sink hole • Away from culverts = loose soils, not representative of sink hole

  6. LIMITED PRE-DESIGN INVESTIGATIONMARCH 2014 • Geotechnical Study FINDINGS • Medium dense silty sand to 4 feet, followed by geosynthetic liner (no liner above culverts) • Very loose to medium dense silty sand and debris from 4 to 20 feet • Soft clay from 20 to 30 feet • Loose to dense silty sand from 30 feet to terminal depth • Groundwater encountered at approximately 10 feet • No evidence of contamination (visible, odors, photoionization detector utilized)

  7. LIMITED PRE-DESIGN INVESTIGATIONMARCH 2014 • Geotechnical Study FINDINGS • Sink Holes • Apparent as chimney-like voids • Immediately above/adjacent to culverts • Majority exist in unpaved shoulders • Several (including beneath road) identified as not yet open at surface • Result of very loose soils to depths of 10 to 15 feet below ground surface • Attributed to vertical migration of sands to voids (debris and lifting holes) • Additional and larger sink holes are likely

  8. LIMITED PRE-DESIGN INVESTIGATIONMARCH 2014 • Geotechnical Study FINDINGS • Dips • Broad roadway settlement issue away from culverts • Attributed to long-term settlement of soft clays at depth and compression of landfill debris • No voids in dip areas away from culverts • Unlikely will develop into new sink hole features

  9. PRE-DESIGN LAND SURVEYJUNE 2014 • South Carolina Department of Health and Environmental Control-Ocean and Coastal Resource Management Critical Line located • Located and obtained elevations of key site features • Identified locations of soil borings from Pre-Design Investigation, used to coordinate location of anomalies • Located utilities where possible • Construction control points established

  10. CONCEPTUAL DESIGN Objective • Repair existing sinkholes • Mitigate development of future sinkholes (to extent possible) • Minimize impacts to landfill Preferred Remedy • Internal inspection • Internal repairs (from inside culverts) • Grouting of voids (from road surface) • Roadbed replacement • Approach avoids sheet piling/significant dewatering

  11. CONCEPTUAL DESIGN Anticipated Construction Sequence • Establish traffic control/install erosion control • Demolish docks • Install culvert plugs on upstream side, dewater culverts, remove weirs, and remove debris • Conduct internal video inspection to verify conditions • During low tide (from inside culvert), seal lifting holes, gaps, and cracks with polyurethane grout and repair spalls and exposed rebar with cement grout • Inject cement compaction grout from road surface to no less than 2 feet below culverts, utilize 6 foot by 6 foot grid spacing • Excavate 4 feet below road surface over culvert area, install geogrid, and restore road bed and surface

  12. CONCEPTUAL DESIGN - SITE PLAN

  13. CONCEPTUAL DESIGN - SITE PLAN

  14. CONCEPTUAL DESIGNRESTORED ROAD FILL SECTION

  15. TYPICAL SIDE SLOPE RESTORATION

  16. CONCEPTUAL DESIGNSLOPE RESTORATION ADJACENT TO CULVERTS

  17. NEXT STEPS • Draft Conceptual Design completed and submitted for review by Marine Corps Recruit Depot Parris Island Partnering Team • Once approved, Remedial Action Contractor Contractor to prepare Final Design Drawings

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