DECOMMISSIONING PLAN for NAVAL AIR WEAPONS STATION (NAWS) CHINA LAKE Prepared by New World Technology 448 Commerce Way Livermore, CA 94551 Revision 3 – 7/2/2007 Enclosure (8) Decommissioning Plan NAWS China Lake TABLE OF CONTENTS 1.0 EXECUTIVE SUMMARY _______________________________________________ 10 1.1 Background Information _____________________________________________ 10 1.2 Decommissioning Objectives __________________________________________ 11 1.3 ALARA Evaluations (Revise to summarize analysis of Section 7.0) __________ 12 1.4 Derived Concentration Guideline Limits (DCGLs) ________________________ 13 1.5 Schedule ___________________________________________________________ 14 1.6 Post Remediation Activities ___________________________________________ 14 1.7 License Amendment _________________________________________________ 14 2.0 FACILITY OPERATING HISTORY ______________________________________ 14 2.1 Current License Number/Status _______________________________________ 17 2.2 Current Authorized Activities _________________________________________ 17 2.3 License and Naval Radioactive Material Permit History ___________________ 17 2.4 Locations Potentially Impacted by Licensed and Non-Licensed DU Activities at China Lake (Historical Review) _____________________________________________ 20 2.4.1 Kennedy Stands Target Area _________________________________________ 20 2.4.2 K-2 Gunnery Range ________________________________________________ 21 2.4.3 Tower 11 Range ___________________________________________________ 22 2.4.4 G-6 Range ________________________________________________________ 28 2.4.5 Burro Canyon-Dead Man’s Canyon ____________________________________ 30 2.4.6 Building 10520 Range ______________________________________________ 30 2.4.7 T-Range Burning Ground (IR Site 6) __________________________________ 31 2.4.8 Skytop, Skytop Playa, Mineshafts _____________________________________ 31 2.4.9 Boondock Facility __________________________________________________ 31 2.4.10 Building 10632 __________________________________________________ 31 2.4.11 Supersonic Naval Ordnance Research Track (SNORT) ___________________ 31 2.4.12 Building 10522 __________________________________________________ 32 2.4.13 Building 10524 __________________________________________________ 32 2.4.14 Building 10540 __________________________________________________ 32 2.4.15 Building 10562 __________________________________________________ 32 2.4.16 Building 10630 __________________________________________________ 32 2.4.17 Building 11640 __________________________________________________ 32 2.4.18 Building 11681 __________________________________________________ 32 2.4.19 Building 15570 __________________________________________________ 32 2.4.20 Building 30594 __________________________________________________ 32 2.4.21 Building 31003 __________________________________________________ 32 2.4.22 Building 31018 __________________________________________________ 33 2.4.23 Building 31110 __________________________________________________ 33 Revision 3 – 7/2/2007 i Decommissioning Plan NAWS China Lake 2.4.24 Building 15510 __________________________________________________ 33 2.4.25 CT Area ________________________________________________________ 33 2.4.26 Building 15560 __________________________________________________ 33 2.4.27 Magazette 45M-4-13 ______________________________________________ 33 2.4.28 Airport Lake ____________________________________________________ 33 2.4.29 B-1-B Range ____________________________________________________ 33 2.4.30 B-4 Range ______________________________________________________ 34 2.4.31 Building 10634 __________________________________________________ 34 2.4.32 Building 12520 __________________________________________________ 34 2.4.33 Building 13090 __________________________________________________ 34 2.4.34 Building 13110 __________________________________________________ 34 2.4.35 Building 30888 __________________________________________________ 34 2.4.36 Building 30973 __________________________________________________ 34 2.4.37 Cole Flats ______________________________________________________ 34 2.4.38 Coso Military Target Range ________________________________________ 35 2.4.39 G-1 Range ______________________________________________________ 35 2.4.40 G-2 Range ______________________________________________________ 35 2.4.41 LC Ranges ______________________________________________________ 35 2.4.42 Off-Station Target-1 (OST-1) Range _________________________________ 35 2.4.43 Salt Wells Pilot Plant (SWPP) Facility ________________________________ 35 2.4.44 Building 15700 __________________________________________________ 35 2.4.45 X-3 Bomb Craters ________________________________________________ 35 2.4.46 X-Pad at NAF ___________________________________________________ 36 2.5 Previous Decommissioning Activities ___________________________________ 36 2.5.1 Skytop Playa Mineshafts_____________________________________________ 37 2.5.2 Tower 11 Target Area _______________________________________________ 37 2.5.3 Site 6 Burn Facility (T-Range Burn Pits) ________________________________ 38 2.5.4 Building 10520 Range (known in the historical record as Building 52) ________ 39 2.6 Spills ______________________________________________________________ 39 3.0 FACILITY DESCRIPTION _____________________________________________ 40 3.1 Site Location and Description _________________________________________ 40 3.2 Population Distribution ______________________________________________ 42 3.3 Current and Future Land Use _________________________________________ 44 3.4 Ambient Air Quality _________________________________________________ 44 3.5 Meteorology and Climatology _________________________________________ 45 3.6 Geology and Seismology ______________________________________________ 46 3.7 Surface Water Hydrology ____________________________________________ 47 3.8 Groundwater Hydrology _____________________________________________ 47 3.9 Natural Resources ___________________________________________________ 49 3.10 Environmentally/Archaeologically Sensitive Areas ________________________ 49 Revision 3 – 7/2/2007 ii Decommissioning Plan NAWS China Lake 4.0 RADIOLOGICAL STATUS OF FACILITY ________________________________ 50 4.1 Contaminated Ranges ________________________________________________ 50 4.1.1 Aerial Surveys _____________________________________________________ 50 4.1.2 Kennedy Stands ___________________________________________________ 50 4.1.3 K-2 Gunnery Range ________________________________________________ 55 4.1.4 K-2 Gunnery Range (Berm and Area Behind Berm) _______________________ 62 4.1.5 Waste Profile Samples of K-2 Berm ____________________________________ 64 4.1.6 G-6 Range ________________________________________________________ 64 4.2 Contaminated Systems and Equipment _________________________________ 68 4.3 Subsurface Soil Contamination ________________________________________ 76 4.3.2 Kennedy Stands Area _______________________________________________ 76 4.3.3 K-2 Gunnery Range ________________________________________________ 76 4.3.4 Tower 11 Area ____________________________________________________ 76 5.0 DOSE MODELING ____________________________________________________ 76 5.1 Site Conceptual Model _______________________________________________ 76 5.1.2 Source Term ______________________________________________________ 77 5.1.3 Physical Characteristics of the Site _____________________________________ 78 5.1.4 Plausible Human Exposure Scenarios and Pathways _______________________ 79 5.2 Unrestricted Release Using Site-Specific Information (K-2 Gunnery Range (Minus Berm)-Tower 11 Area, Kennedy Stands Area) ___________________________ 81 5.2.1 RESRAD Version 6.3 Calculations ____________________________________ 81 5.2.2 Sensitivity Analysis ________________________________________________ 83 6.0 ALTERNATIVES CONSIDERED AND RATIONALE FOR CHOSEN ALTERNATIVE _____________________________________________________________ 84 6.1 Alternatives Considered ______________________________________________ 84 6.2 Rationale for Chosen Alternative ______________________________________ 85 7.0 ALARA ANALYSIS ____________________________________________________ 86 8.0 PLANNED DECOMMISSIONING ACTIVITIES ___________________________ 88 8.1 General considerations for the Planning of Decommissioning Activities ______ 88 8.2 Scope of Planned Decommissioning Activities ____________________________ 89 8.3 Kennedy Stands Target Area __________________________________________ 91 8.4 K-2 Gunnery Range _________________________________________________ 93 8.5 Tower 11 Target Area _______________________________________________ 95 8.6 Contaminated Structures _____________________________________________ 96 8.7 Contaminated Systems and Equipment _________________________________ 97 8.8 Schedules __________________________________________________________ 97 9.0 PROJECT MANAGEMENT AND ORGANIZATION ________________________ 98 Revision 3 – 7/2/2007 iii Decommissioning Plan NAWS China Lake 9.1 Decommissioning Management Organization ____________________________ 98 9.2 Decommissioning Task Management ___________________________________ 98 9.3 Decommissioning Management Positions and Qualifications _______________ 99 9.3.1 Project Manager ___________________________________________________ 99 9.3.2 Radiation Safety Manager ___________________________________________ 100 9.3.3 Health and Safety Manager __________________________________________