Department of Health Seal

TGM for the Implementation of the Hawai'i State Contingency Plan
Section 3
CONTENTS

SECTION 3 CONTENTS

Acronyms and Abbreviations
 
3.0 Site Investigation Design and Implementation
 
3.1 Site Investigation Scoping
  3.1.1 Review Site History and Existing Data
  3.1.2 Consult with Stakeholders
  3.1.3 Develop the Overall Site Investigation Approach
 
3.2 Systematic Planning of Site Investigation
  3.2.1 Overview of Systematic Planning Steps
 
3.3 Conceptual Site Models
  3.3.1 Summarize Known Site Conditions
  3.3.2 Screen for Potential Environmental Hazards
  3.3.3 Default Conceptual Site Models
  3.3.4 Advanced Conceptual Site Models
  3.3.5 Maintaining and Updating the Conceptual Site Model
 
3.4 Selection of Decision Units
  3.4.1 Decision Unit Designation
  3.4.2 Exposure Area Decision Units
  3.4.3 Spill Area Decision Units
  3.4.4 Subsurface Decision Units
  3.4.5 Perimeter Decision Units
  3.4.6 Stockpile Decision Units
  3.4.7 Sediment Decision Units
  3.4.8 Investigation of Large Areas
  3.4.9 Evaluation of Decision Unit Data
 
3.5 Example Decision Units
  3.5.1 Commercial/Industrial Sites
  3.5.2 Single Family Homes
  3.5.3 High-Density Housing
  3.5.4 Schools
  3.5.5 Large Areas
  3.5.6 Small Areas
  3.5.7 Subsurface Decision Units
  3.5.8 Stockpile Decision Units
  3.5.9 Sediment Decision Units
  3.5.10 Testing of Dredge Material
 
3.6 Sampling and Analysis Plans
  3.6.1 Sample Collection Strategy
  3.6.2 Sampling Collection Methods
  3.6.3 Health and Safety Plans
 
3.7 Quality Assurance Project Plans
 
3.8 Data Quality Assessment
  3.8.1 Data Validation
  3.8.2 Data Quality Assessment Process
 
3.9 Site Investigation Reports
 
3.10 Environmental Hazard Evaluation
 
References
 
Tables
 
  3-1. Default DU Volumes for Stockpiles
  3-2. Recommendations for Investigation of Large Areas
 
Figures
  3-1. Expanded Overview of the Site Assessment Process
  3-2. Portion of Sanborn Fire Insurance Map of Former Sugar Mill Operation
  3-3. Historical Aerial Photo of Former Sugar Mill Operation
  3-4. Nine Steps if the Systematic Planning Approach
  3-5. Summary of Environmental Hazards Considered in a Typical Environmental Hazard Evaluation
  3-6. Pictorial Conceptual Site Model
  3-7. Four Default Conceptual Site Models Provided in the HDOH Tier 1 EALs
  3-8. Default Conceptual Site Model
  3-9. Expanded Conceptual Site Model
  3-10. Example Spill Area and Exposure Area Decision Units
  3-11. Example Exposure Area Decision Units
  3-12. Designation of DU Layers for Characterization as Part of a Subsurface Investigation
  3-13. Example Gas Station and Former Boiler UST Sites Where Single Borehole DUs Might be Used.
  3-14. Use of a Single or Small Number of Boring DUs to Estimate the Vertical or Lateral Extent of Contamination at a Specific Location within a Site.
  3-15. Primary (DU-1 and DU-2) and Perimeter DUs (DU-3 and DU-4) Designated Around a Building with Suspected Lead and Termiticide Contamination
  3-16. Perimeter DUs Designated Around a Planned Soil Excavation Area
  3-17. Decision Unit Designated to Investigate PCB Contamination Beside Former Transformer Pad
  3-18. Designation of Spill Area (red) and Exposure Area (blue) DUs at a Former Electrical Power Plant to Determine the Magnitude and Extent of PCB-Contaminated Soil
  3-19. Decision Units for a Former Pesticide Mixing and Storage Area
  3-20. Spill Area Decision Units Designated Beneath Pesticide Mixing and Storage Tank
  3-21. Decision Units to Investigate a Proposed, Four-Acre Hotel Site
  3-22. Example Designation of DUs Around House Perimeter and Yard
  3-23. Example Designation of DUs for Investigation Pesticide-Contaminated Soil at a Public Housing Complex
  3-24. DUs Designated to Test for the Potential Presence of Lead-Contaminated Soil at a School
  3-25. Grouped Lots for Decision Units at a Proposed Residential Site
  3-26. Apparent leak under valve of large fuel tank designated as a small DU in order to document the presence of a release
  3-27. Stormwater drainage vault designated as a DU for testing of sediment runoff from a contaminated property. Representative sample or entire volume of sediment is collected and submitted to the laboratory for processing and analysis
  3-28. Designation of small, targeted DU within a suspected much larger area of contamination at an illegal dump site in order to document presence of contamination and identify potential contaminants of concern
  3-29. Subsurface Burn Layer Targeted for MI Sample Collection Following Excavation of Former Dump Area
  3-30. Cross Section of Subsurface DU Layers Designated at Former Pesticide Mixing Area Facility (white indicates anticipated clean soil)
  3-31. Stockpile Segregated into DU Volumes for Testing Based on Planned Reuse
  3-32. DU Designation for an Investigation of Former Sugar Mill Drainage Canal
  3-33. DU Designated for Characterization of Sediment at the Mouth of a Wastewater Pond Outfall
  3-34. Sediment DUs Designated for a Spill of PCB-based Transformer Oil Beside a Small Stream
  3-35. Decision Units Designated for Characterization of Arsenic-Contaminated Sediment in an Estuary
  3-36. Sediment DU Layers Designated for the Estuary Example Depicted in Figure 3-35
 
Appendix
  3-A Guidance for the Evaluation of Imported and Exported Fill Material, Including Contaminant Characterization of Stockpiles