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

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Last revision date: 08 August 2006

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