Kai Tak Development Engineering Study Cum Design and Construction of Advance Works Annex a – Investigation, Design and Construction KTAC and KTTS Studies
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Agreement No. CE 35/2006(CE) Kai Tak Development Engineering Study cum Design and Construction of Advance Works Annex A – Investigation, Design and Construction KTAC and KTTS Studies Agreement No. CE 35/2006(CE) Kai Tak Development Engineering Study cum Design and Construction of Advance Works – Investigation, Design and Construction Annex A REPORT ON KTAC and KTTS STUDIES Contents 1 INTRODUCTION..................................................................................................................1-1 1.1 Background ............................................................................................................ 1-1 1.2 Overall Approach of Odour Impact Assessment .................................................... 1-2 1.3 Purpose and Structure of this Report..................................................................... 1-3 2 IDENTIFICATION OF ENVIRONMENTAL PROBLEMS ASSOCIATED WITH KTAC AND KTTS ....................................................................................................................................2-1 2.1 Existing Environmental Conditions ......................................................................... 2-1 2.2 Existing Drainage and Sewerage Systems in the Catchment Areas of KTAC and KTTS....................................................................................................................... 2-1 2.3 Existing Odour, Water and Sediment Pollution Sources ........................................ 2-2 2.4 Extent of Environmental Problems Based on Findings of Previous Surveys and Investigations .......................................................................................................... 2-4 2.5 Reference ............................................................................................................. 2-10 3 FURTHER DETAILED FIELD SURVEYS............................................................................3-1 3.1 Purpose and Objectives ......................................................................................... 3-1 3.2 Approach and Methodology ................................................................................... 3-1 3.3 Results of Field Surveys......................................................................................... 3-6 3.4 Interpretation of Field Survey Results .................................................................... 3-8 4 FURTHER DETAILED LABORATORY TESTING ..............................................................4-1 4.1 Purpose and Objectives ......................................................................................... 4-1 4.2 Approach and Methodology ................................................................................... 4-1 4.3 Results of Laboratory Testing ................................................................................ 4-5 4.4 Interpretation of Laboratory Testing Results .......................................................... 4-8 4.5 Summary and Conclusion .................................................................................... 4-10 i Agreement No. CE 35/2006(CE) Kai Tak Development Engineering Study Annex A cum Design and Construction of Advance Works KTAC and KTTS Studies – Investigation, Design and Construction 5 ODOUR GENERATION MECHANISM................................................................................5-1 5.1 Introduction............................................................................................................. 5-1 5.2 Types of Emissions ................................................................................................ 5-1 5.3 Spatial Variation of Odour Emissions in KTAC and KTTS..................................... 5-3 5.4 Variation of Odour Emissions Against Environmental Factors .............................. 5-5 5.5 Summary ................................................................................................................ 5-7 6 TREATMENT OF SEDIMENT..............................................................................................6-1 6.1 Introduction............................................................................................................. 6-1 6.2 Review of Sediment Treatment Technologies ....................................................... 6-1 6.3 Remediation Selection Strategy............................................................................. 6-4 6.4 Comparison of Sediment Treatment Technologies................................................ 6-7 6.5 In-situ Bioremediation Pilot Scale Field Trial........................................................ 6-15 6.6 Odour Removal by Bioremediation ...................................................................... 6-20 6.7 Treatment for Sediments on/within Seawalls ....................................................... 6-22 6.8 Recommendations................................................................................................ 6-36 6.9 References ........................................................................................................... 6-36 7 IMPROVEMENT OF WATER CIRCULATION.....................................................................7-1 7.1 Introduction............................................................................................................. 7-1 7.2 Legislation, Policies, Plans, Standards and Criteria............................................... 7-2 7.3 Baseline Conditions................................................................................................ 7-6 7.4 Key Findings of the KTPR ...................................................................................... 7-8 7.5 Assessment Methodology .................................................................................... 7-10 7.6 Prediction and Evaluation..................................................................................... 7-15 7.7 Summary .............................................................................................................. 7-17 8 CONTAINMENT OF POLLUTION ENTERING KTAC AND KTTS.....................................8-1 8.1 Introduction............................................................................................................. 8-1 8.2 Review of Previous and On-Going Relevant Project ............................................. 8-1 8.3 Dry Weather Flow Interception Scheme............................................................... 8-12 8.4 Description of Drainage Culvert System in KTN .................................................. 8-13 8.5 Desilting Procedures and Preliminary Maintenance Plan .................................... 8-15 8.6 Maintenance Operations during Rainstorms, Tropical Cyclones or inclement Weather ................................................................................................................ 8-21 8.7 Summary .............................................................................................................. 8-21 ii Agreement No. CE 35/2006(CE) Kai Tak Development Engineering Study cum Design and Construction of Advance Works Annex A – Investigation, Design and Construction KTAC and KTTS Studies 9 ODOUR IMPACT ASSESSMENT .......................................................................................9-1 9.1 Introduction ............................................................................................................. 9-1 9.2 Odour Assessment Criteria..................................................................................... 9-1 9.3 Air Sensitive Receivers........................................................................................... 9-1 9.4 Odour Emission Inventory ...................................................................................... 9-2 9.5 Odour Modelling Methodology................................................................................ 9-6 9.6 Evaluation and Prediction of Potential Odour Impacts ......................................... 9-14 List of Tables Table 3.1 Sampling Design at Water Zones and Culvert Discharges Table 3.2 Water Sampling Locations Table 3.3 Summary of In-situ Marine Water Quality Measurement Results in Water Zones and Culvert Discharges Table 3.4 Summary of Laboratory Analyses Results for Odour Emission Samples Table 3.5 Summary of Laboratory Analyses Results for Air Samples Table 3.6 Results of Odour Potential of Water Samples Table 3.7 Ratios of H 2S Concentration over Odour Concentration at Different Sampling Zones Table 4.1 Sampling Locations of Sediment Core and Marine Water and Rationale for Selection Table 4.2 Summary Results of H 2S and Odour Concentration Measurements and Hedonic Tone Test of the 49 Scenarios Table 5.1 Measured SOER near JVCO Table 5.2 Comparison of Odour Emissions with and without Water Column (Incubation Temperature: 25 oC) Table 5.3 Summary of Key Odour Sources, Generation Mechanism and Influencing Factors Table 6.1 Sediments Treatment Technologies Table 6.2 Comparison of In-situ Sediment Treatment Methods Table 6.3 Dosage of Nitrate Applied to Treatment Area Table 6.4 Work Schedule of Bioremediation Pilot Scale Field Test Table 6.5 Different Treatment Conditions Set in the Bench-Scale Testing Table 6.6 Results of Odour Emission Rate Experiment for Treated and Untreated Sediments Table 6.7 Results of Odour Potential Experiment for Treated and Untreated Sediments Table 6.8 Odour Emissions Comparison Between Areas with and without Bioremediation Table 6.9 Hydrogen Sulphide Emission Comparison