MARSSIM - The Risk Assessment Information System - Oak Ridge ...

CONTENTS
Page
2.5.4 Design Considerations for Relatively Uniform
Distributions of Contamination .............................. 2-30
2.5.5 Developing an Integrated Survey Design ....................... 2-31
2.6 Flexibility in Applying MARSSIM Guidance ......................... 2-33
2.6.1 Alternate Statistical Methods ................................ 2-34
2.6.2 Alternate Null Hypothesis .................................. 2-39
2.6.3 Integrating MARSSIM with Other Survey Designs . .............. 2-39
3. Historical Site Assessment ............................................... 3-1
3.1 Introduction .................................................... 3-1
3.2 Data Quality Objectives ........................................... 3-2
3.3 Site Identification ................................................ 3-4
3.4 Preliminary Historical Site Assessment Investigation .................... 3-4
3.4.1 Existing Radiation Data ..................................... 3-7
3.4.2 Contracts and Interviews .................................... 3-9
3.5 Site Reconnaissance .............................................. 3-9
3.6 Evaluation of Historical Site Assessment Data ........................ 3-10
3.6.1 Identify Potential Contaminants .............................. 3-11
3.6.2 Identify Potentially Contaminated Areas ....................... 3-12
3.6.3 Identify Potentially Contaminated Media ...................... 3-13
3.6.4 Develop a Conceptual Model of the Site ....................... 3-21
3.6.5 Professional Judgment ..................................... 3-22
3.7 Determining the Next Step in the Site Investigation Process ............. 3-24
3.8 Historical Site Assessment Report .................................. 3-24
3.9 Review of the Historical Site Assessment ............................ 3-25
4. Preliminary Survey Considerations ........................................ 4-1
4.1 Introduction .................................................... 4-1
4.2 Decommissioning Criteria ......................................... 4-1
4.3 Identify Contaminants and Establish Derived Concentration Guideline Levels 4-3
4.3.1 Direct Application of DCGLs ................................ 4-4
4.3.2 DCGLs and the Use of Surrogate Measurements ................. 4-4
4.3.3 Use of DCGLs for Sites With Multiple Radionulcides ............. 4-8
4.3.4 Integrated Surface and Soil Contamination DCGLs ............... 4-8
4.4 Classify Areas by Contamination Potential ........................... 4-11
4.5 Select Background Reference Areas ................................ 4-13
4.6 Identify Survey Units ............................................ 4-14
MARSSIM, Revision 1 vi August 2000