Culebra, Puerto Rico Restoration Advisory Board Projects Briefing U.S. Army Corps of Engineers Jacksonville District Jacksonville, FL 32207-0019 June 2012 Table of Contents Page 1.0 Introduction ............................................................................................................................. 1 2.0 Non-Munitions Site Inspection (Lower Camp Area) Project 00 ............................................ 2 2.1 Background ......................................................................................................................... 2 2.2 Investigation Results ........................................................................................................... 3 2.2.1 Previous Investigation ................................................................................................. 3 Soil and Groundwater Investigation ................................................................................... 4 2.2.2 Current Investigation .................................................................................................. 4 2.3 Lower Camp Area (Project 00) Site Inspection Conclusions ............................................. 5 3.0 Munitions Response Sites (MRSs) ......................................................................................... 5 3.1 Introduction ......................................................................................................................... 5 3.2 MRSs 02, 04, 05 and 07 (Land Areas) ................................................................................ 7 3.2.1 Historical and Current MRS Use ................................................................................ 7 MRS 02 Cerro Balcon and Adjacent Cays ......................................................................... 7 MRS 04 Flamenco Lagoon Maneuver Area ....................................................................... 7 MRS 05 Mortar and Combat Range Area........................................................................... 7 MRS 07 Culebrita Artillery Impact Area............................................................................ 8 3.2.2 Remedial Investigation/Feasibility Study (RI/FS) ...................................................... 8 Environmental Sampling .................................................................................................... 9 Conclusions ....................................................................................................................... 13 3.3 MRSs 06, 08, 09, 10, 11 and 13 (Land Areas) .................................................................. 16 3.3.1 Historical and Current MRS Use .............................................................................. 16 MRS 06 Artillery Firing Area ........................................................................................... 16 MRS 08 Cayo Norte Impact Area ..................................................................................... 16 MRS 09 Soldado Point Mortar and Bombing Area .......................................................... 16 MRS 10 Defensive Firing Area No. 1 .............................................................................. 17 MRS 11 Defensive Firing Area No. 2 .............................................................................. 17 MRS 13 Cayo Luis Pena Impact Area .............................................................................. 17 3.3.2 Remedial Investigation/Feasibility Study ................................................................. 17 Environmental Sampling .................................................................................................. 22 Conclusions ....................................................................................................................... 22 3.4 Underwater Areas ............................................................................................................. 23 3.4.1 Background ............................................................................................................... 23 3.4.2 Process ...................................................................................................................... 24 Environmental Baseline Survey ........................................................................................ 24 Geophysical Survey of Underwater Transects .................................................................. 28 Digging Underwater .......................................................................................................... 33 Remedial Investigation/Feasibility Study Reports............................................................ 34 3.5 Northwest Peninsula ......................................................................................................... 34 Appendix A: Culebra RAB Projects Briefing USACE SOPs Endangered Species ........................ Appendix B:Culebra RAB Projects Briefing Report to Congress – NW Peninsula Study .............. Culebra Restoration Advisory Board Briefing i List of Figures Page Figure 1: Map Showing Project Areas ........................................................................................... 2 Figure 2: Axle and Tires in Lower Camp Area ............................................................................. 2 Figure 3: Map of Project 00 Lower Camp Area ............................................................................ 3 Figure 4: Vehicle Parts in Lower Camp Area ................................................................................ 4 Figure 5: Water Valve in Lower Camp Area ................................................................................. 4 Figure 6: Map Showing Debris Field in Lower Camp Area ........................................................... 5 Figure 7: Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Process Chart .................................................................................................................................. 6 Figure 8: Map of MRS 04 Showing Locations of Transects ....................................................... 10 Figure 9: Map of MRS 04 Showing Locations of Environmental Samples ................................ 10 Figure 10: Map of MRS 05 Showing Locations of Transects ..................................................... 11 Figure 11: Map of MRS 05 Showing Locations of Environmental Samples .............................. 11 Figure 12: Map of MRS 07 Showing Locations of Environmental Sampling ............................ 12 Figure 13: Map of MRS 07 Showing Locations of Transects ..................................................... 12 Figure 14: Crews Using a Digital Geophysical Magnetometer to Investigate a Grid ................. 18 Figure 15: Map of MRS 06 Showing Transects and Grids .......................................................... 19 Figure 16: Map of MRS 08 Showing Transects and Grids .......................................................... 19 Figure 17: Map of MRS 09 Showing Transects and Grids .......................................................... 20 Figure 18: Map of MRS 10 Showing Transects and Grids .......................................................... 20 Figure 19: Map of MRS 11 Showing Transects and Grids .......................................................... 21 Figure 20: Map of MRS 13 Showing Transects and Grids .......................................................... 21 Figure 21: Underwater Areas with Potential for Munitions ........................................................ 24 Figure 22: Example of a Bathymetry Map .................................................................................. 25 Figure 23: Remotely Operated Vehicle Used for Underwater Investigations ............................. 26 Figure 24: SONAR Components .................................................................................................. 26 Figure 25: Example of Side Scan Sonar Showing Underwater Features..................................... 27 Figure 26: Photograph from the Underwater Survey at Cayo Luis Pena Showing a 5" Illumination Round ....................................................................................................................... 28 Figure 27: Map Showing Transect Design for Cayos Somberito, Tiburon and Genuqui............ 29 Figure 28: Map Showing Transect Design for Cayos Lobito, Lobo and El Mono ...................... 29 Figure 29: Map Showing Transect Design for Alcarraza, Los Gemelos and Piedra Stevens ..... 30 Figure 30: Map Showing Transect Design for Culebrita ............................................................. 30 Figure 31: Map of MRS 09 Showing the Underwater Investigation Areas ................................. 31 Figure 32: Map of MRS 13 Showing the Underwater Investigation Areas ................................. 31 Figure 33: Map of MRS 03 Showing Underwater Investigation Areas ....................................... 32 Figure 34: Map of MRS 12 Showing Underwater Investigation Areas ....................................... 32 Figure 35: Diver Using an Electromagnetic Device on a Sled .................................................... 33 Culebra Restoration Advisory Board Briefing ii List of Tables Page Table 1: List of Projects in Culebra with Phase of Work and Contractor ..................................... 1 Table 2: Munitions and Munitions Debris Identified at MRS 04, 05 and 07 ................................ 9 Table 3: Environmental Sampling