Site Characterization Work Plan for the Gnome-Coach Site, New Mexico
Total Page:16
File Type:pdf, Size:1020Kb
Nevada DOE/NV--689-Rev. 1 Environmental Restoration Project Site Characterization Work Plan for the Gnome-Coach Site, New Mexico Controlled Copy No.: Revision No.: 1 January 2002 Approved for public release; further dissemination is unlimited. Environmental Restoration Division U.S. Department of Energy National Nuclear Security Administration Nevada Operations Office Available for public sale, in paper, from: U.S. Department of Commerce National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 Phone: 800.553.6847 Fax: 703.605.6900 Email: [email protected] Online ordering: http://www.ntis.gov/ordering.htm Available electronically at http://www.doe.gov/bridge Available for a processing fee to U.S. Department of Energy and its contractors, in paper, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831-0062 Phone: 865.576.8401 Fax: 865.576.5728 Email: [email protected] Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or its contractors or subcontractors. Printed on recycled paper DOE/NV--689-Rev. 1 SITE CHARACTERIZATION WORK PLAN FOR THE GNOME-COACH SITE, NEW MEXICO U.S. Department of Energy National Nuclear Security Administration Nevada Operations Office Las Vegas, Nevada Controlled Copy No.: Revision No.: 1 January 2002 Approved for public release; further dissemination is unlimited. SITE CHARACTERIZATION WORK PLAN FOR THE GNOME-COACH SITE, NEW MEXICO Approved by: Date: Monica Sanchez, Project Manager Offsites Project Approved by: Date: Runore C. Wycoff, Division Director Environmental Restoration Division Gnome-Coach SC Work Plan Section: Contents Revision: 1 Date: 01/14/2002 Page i of xviii Table of Contents List of Figures. ix List of Tables. .xii List of Acronyms and Abbreviations . xiv 1.0 Introduction. 1 1.1 Purpose . 3 1.2 Scope of Work . 3 1.3 Investigation Work Plan Contents . 5 2.0 Facility Description. 6 2.1 Physical Setting. 6 2.1.1 Land Status . 6 2.1.2 Environmental Setting . 6 2.1.3 Geology and Hydrology. 8 2.1.4 Surface Water, Wetlands, and Floodplains . 10 2.2 Operational History. 11 2.2.1 Trailer Park and Control Point. 14 2.2.2 Fallout Plume. 14 2.2.3 Gnome-Coach Shaft Area . 14 2.2.4 Gnome Surface Ground Zero. 16 2.2.5 Evaporation Pond/Waste Tank . 17 2.2.6 Area 57. 17 2.2.7 Salt Muckpile. 17 2.2.8 Storage Areas. 18 2.2.9 Decontamination Pad. 19 2.2.10 Laundry/Lab Facilities. 19 2.2.11 Contaminated Waste Dump . 20 2.2.12 Salvage Yard . 20 2.2.13 Drill Hole Pads. 21 2.2.13.1 LRL-7 and LRL-8 Drill Pads . 27 2.2.13.2 Drill Pad for Monitoring Wells USGS-4 and USGS-8 . 28 2.3 Site Restoration Activities . 28 2.3.1 Initial Cleanup in 1968/1969 . 28 2.3.2 1972 Area Reconnaissance . 29 2.3.3 Second Cleanup in 1977 to 1979 . 30 2.4 Current Conditions at the Gnome-Coach Site . 32 2.5 Previous Investigations . 33 2.5.1 Surface Investigations . 33 1/16/02\P:\Doc-prod\OFFSITES\Gnome\Work_Pln\Final Rev_1\Gnome-CoachTOC.fm Gnome-Coach SC Work Plan Section: Contents Revision: 1 Date: 01/14/2002 Page ii of xviii Table of Contents (Continued) 2.5.2 Radionuclide Background Investigations . 33 2.5.2.1 Radionuclide Concentrations in Soil at the Gnome-Coach Site . 35 2.5.2.2 Radionuclide Concentrations in Soil at the WIPP . 36 2.5.2.3 Radionuclide Concentrations in Soil in the Vicinity of WIPP . 36 2.5.2.4 Radionuclide Concentrations in Soil at Distant Locations within New Mexico . 39 2.5.2.5 Summary of the Background Radionuclide Concentrations in Soil for the Gnome-Coach Site . 39 2.5.3 Subsurface Investigations . 41 3.0 Data Quality Objectives . 43 3.1 Conceptual Site Model . 43 3.1.1 Surface Conceptual Site Model . 45 3.1.2 Subsurface Conceptual Site Model . 46 3.2 Contaminants of Potential Concern . 49 3.2.1 COPCs for Surface and Shallow Subsurface Investigation . 51 3.2.2 Preliminary Action Levels (PALs) . 54 3.2.3 COPCs for Subsurface Investigation . 55 4.0 Surface and Shallow Subsurface Work Plan . 59 4.1 Demarcate Historical Operational Areas . 60 4.2 Investigation of Radiological Constituents. 60 4.2.1 Driveover Radiological Survey . 69 4.2.1.1 Driveover Radiological Survey Design and Assumptions . 70 4.2.2 Shallow Subsurface In Situ Radiological Surveys. 72 4.2.2.1 CPT In Situ Radiological Survey Design and Assumptions . 74 4.2.2.2 Confirmation Soil Sample Collection for Radiological COPCs . 75 4.2.2.3 Data Quality and Analysis . 76 4.2.3 Establishing Background Values for Radiological Surveys . 76 4.3 Vegetation Sampling. 77 4.4 Geophysical Investigation. 78 4.4.1 Geophysical Survey Areas. 79 4.4.1.1 Technical Methodology . 80 4.5 Delineate Soil Investigation Areas . 80 4.6 Representative Inorganic Background Sample Collection . 81 Gnome-Coach SC Work Plan Section: Contents Revision: 1 Date: 01/14/2002 Page iii of xviii Table of Contents (Continued) 4.7 Surface/Shallow Subsurface Soil Investigation of Chemical Constituents . 83 4.7.1 Soil Sampling Techniques . 84 4.7.2 Field Screening . 85 4.7.3 Sampling Criteria. 86 4.7.4 Soil Sampling Locations for Surface/Shallow Subsurface Characterization . 87 4.7.4.1 Mud Pit Sampling Locations . 88 4.7.4.2 Sampling Locations at Suspect AOCs with Chemical COPCs . 89 4.7.4.3 USGS-1 Concrete Pad and Grease Pit (near shaft) . 91 4.7.4.4 Other Sampling Locations . 91 4.7.5 Data Quality and Analysis . 92 4.8 Surface Water and Shallow Groundwater Investigation. 92 4.9 Additional Requirements and Activities. 92 4.9.1 Health and Safety. 92 4.9.2 Environmental Compliance and Waste Management . 93 4.9.3 NEPA Requirements . 94 4.9.4 Quality Assurance ..