Coramba Groundwater Contamination: Environmental Assessment

Coffs Harbour City Council (Council) has been working with the NSW Department of Environment & Climate Change (DECC), other government agencies and community representatives to progress the remediation of hydrocarbon contaminated groundwater affecting an area in Coramba.

Council received grant funding from the NSW Government via its Environmental Trust, to progress the remediation on behalf of the community.

Council recently submitted a Major Project Application and Detailed Environmental Assessment under Part 3A of the Environmental Planning & Assessment Act (EP&A Act), to the NSW Department of Planning, seeking the Ministers Approval to construct and operate a groundwater remediation technology in Martin Street, Coramba.

In essence, the remediation includes the installation of an "air sparge system with soil vapour extraction (SVE) and treatment". The location of the "air sparge system" will be within the alluvial sediments adjacent to the Orara River at the end of Martin Street. The system is intended to intercept contaminated groundwater before it can enter the river, and in doing so should assist in the reduction of hydrocarbon vapour release to the atmosphere.

The Detailed Environmental Assessment (EA) was placed on public exhibition and advertised by the Department of Planning (DoP), in accordance with statutory requirements. The submissions document is attached below the EA.

The following documents form the EA.

**Stage 1 Coramba Contaminated Groundwater Remediation Environmental Assessment**
	Download entire Environmental Assessment document (2.16MB) or download sections below.
1.	Coramba Remediation EA Part 1 (701KB) Contains: Table of Contents Executive Summary Definitions 1. Introduction 2. Subject site Figure 1: Site location
2.	Coramba Remediation EA Part 2 (477KB) Contains: 3. Project Description Figure 2: Proposed layout of air sparge and SVE system Figure 3: Air sparge and SVE system details
3.	Coramba Remediation EA Part 3 (277KB) Contains: 4. Statutory Provisions Figure 4: Local Environment Plan 2000 Zoning Map, Coramba
4.	Coramba Remediation EA Part 4 (928KB) Contains: 5. Consultation Environmental Assessment Figure 5: Annual Wind Rose - Coffs Harbour Figure 6: Annual Stability Rose - Coffs Harbour Figure 7: Flood Frequency Analysis Figure 8: Flood Extents Figure 9: Project location, Identified Residential Receivers and Noise Logging Locations
5.	Coramba Remediation Detailed EA Part 5 (120KB) Contains: 7. Statement of Commitments 8. Justification of the Project 9. Conclusions 10 Certifications 11. References

**Appendix A: Director General's Requirements**
1.	Appendix A Coramba Remediation EA (541KB)

**Appendix B: Remedial Action Plan**
1.	Appendix B Part 1 (313KB) Contains: Table of Contents Executive Summary 1. Introduction 2. Site details 3. Environmental Setting 4. Remediation Criteria 5. Contamination Status 6. Regulatory Requiremens 7. Remedial Actions 8. Validation 9. Environmental Management Plan 10. Conclusions
2.	Figure 1: Site location (1.47MB)
3.	Figure 2: Remediation areas (146KB)
4.	Figure 3: SVE Schematic (949KB)
5.	Figure 4: Air Sparging Schematic (723KB)
6.	Figure 5: Interception Trench Schematic (32KB)
7.	Figure 6: Groundwater Contours(201KB)
8.	Table 1 and Table 2 (45KB) Comparison of Remediation Technologies for Coramba NSW
9.	Figure 7: Soil Vapour Extraction and Groundwater Depression Conceptual Well Layout along Gale St (56KB)

**Appendix C: Site Audit Report 5 Martin St Coramba NSW**
1.	Appendix C: Site Audit Report 5 Martin St Coramba NSW (7.16MB) This file was unable to be reduced in size due to consultant restrictions. Please accept our apologies.

**Appendix D: Sparge Trial Report July 2008**
1.	Appendix D: Sparge Trial Report July 2008 (1.63MB)

**Appendix E: EPA Declaration of Remediation Site 5 Martin St Coramba**
1.	Appendix E: EPA Declaration of Remediation Site 5 Martin St Coramba (1.68MB)

**Appendix F: Minutes of Interagency Community Working Party**
1.	Appendix F: Minutes of Interagency Community Working Party (1.17MB)

**Appendix G: Air Quality Impact Assessment**
1.	Appendix G: Air Quality Impact Assessment (1.67MB)

**Appendix H pt 1: Ecology Assessment**
1.	Appendix H pt 1: Ecology Assessment - Part 1 (1.49MB) Contains: Table of Contents 1. Introduction Figure 1: Study Area Figure 2: Proposed layout of Air Sparge and SVE System Methods
2.	Appendix H pt 1: Ecology Assessment - Part 2 (324KB) Contains: 3. Results 4. Flora and Fauna Impact Assessment 5. Recommended Mitigation Measures 6. Conclusion 7. References
3.	Appendix A: Threatened species database results (340KB)

**Appendix H pt 2: Vegetation Management Plan**
1.	Appendix H pt 2: Vegetation Management Plan (475KB)

**Appendix I: Noise and Vibration Impact Assessment**
1.	Appendix I Part 1 (1.32MB) Contains: Table of Contents Glossary Executive Summary 1. Introduction 2. Existing Environment Figure 2.1 Project Location, Identified Residential Receivers and Noise Logging Locations Figure 2.2 Logger 1 - Noise Logging at 10 Martin Street Figure 2.3 Logger 2 - Noise Logging at 28 Gale Street
2.	Appendix I Part 2 (436KB) Contains: 3. Noise and Vibration Criteria 4. Noise Modelling 5. Results and Assessment Figure 5.1 Predicted Sound Pressure Levels - Coramba Remediation Figure 5.2 Predicted Sound Pressure Levels with Enclosure - Coramba Remediation 6. Recommendations 7. Conclusions

**Appendix J: Traffic Assessment**
1.	Appendix J Part 1 (1.27MB) Contains: 1. Introduction 2. Location Figure 1 - Site Locality Figure 2 - Closer Aerial View of the intersection of Martin Street and Gale Street near the site of the works 3. Site Inspection 4. Available Traffic Information 5. Anticipated Access Requirements 6. Discussion 7. Conclusion
2.	Appendix J Part 2 (489KB) Contains: Appendix A Site Photographs Appendix B CHCC Traffic Count Data

Submissions Report

Download CHCC_Submmissions_Report_Final_GHD_07_0085_Coramba_Remediation_May_2009.pdf Coramba Groundwater Remediation Project - Submissions Report (578KB)