Stage 2 - DEHP

1. National Contamination Management Program – Project Decision Tree Stage 1 - DEHP Contamination Hazard Assessment Tool (CHAT) Stage 1 Preliminary Investigation and CSM Refer to Defence checklist for Stage 1 Investigations CHAT Hazard Category = Medium to Very High START Preliminary Risk Assessment Using the C-RAT C-RAT Outcome = Low Risk CHAT Hazard Category = Low C-RAT Outcome = Medium to Very High Risk 3-Year Review of Risk START Stage 2 - DEHP Stage 2 Detailed Site Investigation Soil /groundwater/ sediment sampling & analysis, and comparison of results to published investigation levels. Refer to Defence checklist for Stage 2 Investigations No Further Action or Implement Pollution Prevention or Contamination Management Controls No Is there sufficient data to adequately delineate the extent of contamination Yes C-RAT Outcome = Low Risk Review of C-RAT Outcomes Based on Stage 2 Outcomes C-RAT Outcome = Medium to Very High Risk Will site management controls reduce the contamination risk to low ? Yes No Based on the results of the risk assessment, will site management controls reduce the contamination risk to low ? Review of C-RAT Outcomes Based on Results of Risk Assessment Human Health or Ecological Risk Assessment Derivation of site specific acceptance levels Yes No Notify Assistant Director Environmental Provisions Development of Cost Estimate Provision Recorded Stage 3 - DEHP Stage 4 – DEHP or MUL Remediation Options Assessment Cost Benefit Analysis Technology Review Sustainability Assessment Remediation Design Document (RDD) and Tender Documents Contractor to Prepare Remediation Documentation: Environmental Clearance Certificate (ECC) Remediation Works Plan (RWP) Occupational Health and Safety Plan (OH&S) Environmental Management Plan (EMP) Engagement of Remediation Contractor On basis of RDD Selection of Remediation Strategy Remediation Workshop Initial Environ-mental Review (IER) Implementation of RAP Contractor to Obtain All Relevant Permits and Approvals Remediation Feasibility Study (RFS) and Pilot Trial Remediation Action Plan (RAP) Review of C-RAT Based on Validation Outcomes Site Validation Prepare Validation Report Do the RFS and pilot trial demonstrate that the remediation strategy will be effective to reduce the contamination risk to low? No Stage 4 - DEHP Does site validation demonstrate that the remediation objectives have been met ? Yes No Yes