Guidance Notes for Investigation and Remediation of Contaminated Sites of Petrol Filling Stations, Boatyards, and Car Repair/Dismantling Workshops

1. INTRODUCTION

• 1.1 Background
• 1.2 Submission to EPD
• 1.3 Structure of the Guidance Note

2. SITE APPRAISAL

3. SITE INVESTIGATION

• 3.1 Subsurface Geological Conditions and Groundwater Movement
• 3.2 Sampling Strategy
• 3.3 Sampling Method
• 3.4 Sample Size and Handling Procedures

4. RESULT INTERPRETATION

5. SELECTION OF A REMEDIATION METHOD

6. REMEDIATION ACTION PLAN

7. IMPLEMENTATION

• 7.1 Soil Venting/Air Sparging
• 7.2 Excavation and Landfill Disposal

8. SAFETY

• 8.1 Risks during Site Investigation and Remediation
• 8.2 Safety Measures

LIST OF TABLES

• Table 1.1 List of Submissions to EPD
• Table 2.1 Activities and Installations with the Potential to Cause Contamination
• Table 2.2 Typical Sources of Information Used to Assess Site Histories
• Table 2.3 Criteria for Adopting Full-scale or Simplified Site Investigation
• Table 3.1 Petrol Filling Stations and Vehicle Repairing/Dismantling Workshops:
  Main Groups of Contaminants and their Probable Locations
• Table 3.2 Boat Building, Repairing and Breaking Activities and their Associated Contaminants
• Table 3.3 Minimum Number of Sampling Points
• Table 5.1 Comparison of Remediation Methods
• Table 6.1 Outline of a Typical Remediation Action Plan
• Table 8.1 Contaminants of Health Concern during Site Investigation & Remediation

LIST OF FIGURES

• Figure 1.1 Essential Steps of Contamination Assessment
• Figure 7.1 Essential Steps of Soil Venting/Air Sparging
• Figure 7.2 Essential Steps of Excavation and Landfill Disposal

ANNEXES

• Annex A Preliminary Site Appraisal Checklist
• Annex B Checklist of Possible Contaminants
• Annex C Recovery Trenches or Wells
• Annex D Soil Venting/Air Sparging
• Annex E Excavation and Landfill Disposal