1. RISK BASED ENVIRONMENTAL ASSESSMENT RISK-BASED ENVIRONMENTAL ASSESSMENT Simon Catchpole Porto, May 2012 www.bgcengineering.ca

2. RISK BASED ENVIRONMENTAL ASSESSMENT AN OVERALL RISK ASSESSMENT ADDRESSES THE UNDERLYING PHYSICAL RISKS, UPON WHICH THE NON-PHYSICAL RISKS DEPEND: Environmental and Geotechnical Risks Legal and Permitting Social and Political Financial Safety and Human Health Operational Risks

3. RISK BASED ENVIRONMENTAL ASSESSMENT

5. RISKS AND IMPACTS INVENTORY COMPONENT ENVIRONMENTAL ASPECT OR HAZARD PREPARATION WORKS PERMANENT DAMWATER INTAKECOMMISSIONING SURFACE WATER DIVERSION SITE CLEARING COFFER DAM CONSTRUCTION EXCAVATION TO BASE LEVEL MATERIALS MANAGEMENT DAM WALL CONSTRUCTION COMPLEMENTARY WORKS EXCAVATION OF PORTAL TUNNEL ADVANCE WASTE ROCK REMOVAL WATER MANAGEMENT FILLING OF RESERVOIR DAMMING OF RIVER FLOW DISCHARGE OF FLOOD FLOWS GEOMORPHOLOGY MODIFICATION OF SLOPES II III MODIFICATION OF WATER COURSESI I II SOIL REMOVAL / DISTURBANCE OF SOIL I I II I INCREASED EROSION RATEIR RR R HYDROLOGY MODIFICATION OF FLOW REGIMEI I I III MODIFICATION OF SLOPE RUNOFF I II I INCREASED SEDIMENT LOADR R I MODIFICATION OF RECHARGE TO GROUNDWATER I I III I EXPECTED IMPACT R ENVIRONMENTAL RISK

6. RISK BASED ENVIRONMENTAL ASSESSMENT RISKS AND IMPACTS INVENTORY COMPONENT ENVIRONMENTAL ASPECT OR HAZARD PREPARATION WORKS PERMANENT DAMWATER INTAKECOMMISSIONING SURFACE WATER DIVERSION SITE CLEARING COFFER DAM CONSTRUCTION EXCAVATION TO BASE LEVEL MATERIALS MANAGEMENT DAM WALL CONSTRUCTION COMPLEMENTARY WORKS EXCAVATION OF PORTAL TUNNEL ADVANCE WASTE ROCK REMOVAL WATER MANAGEMENT FILLING OF RESERVOIR DAMMING OF RIVER FLOW DISCHARGE OF FLOOD FLOWS GEOMORPHOLOGY MODIFICATION OF SLOPES II III LANDSLIDE IN CATCHMENTRR R R MODIFICATION OF WATER COURSESI I II SOIL REMOVAL / DISTURBANCE OF SOIL I I II I INCREASED EROSION RATEIR RR R HYDROLOGY MODIFICATION OF FLOW REGIMEI I I III MODIFICATION OF SLOPE RUNOFF I II I INCREASED SEDIMENT LOADR R I MODIFICATION OF RECHARGE TO GROUNDWATER I I III FLOOD EVENTS IN CATCHMENTR I EXPECTED IMPACT R ENVIRONMENTAL RISK R EFFECT ON GEOHAZARD RISK

7. RISK BASED ENVIRONMENTAL ASSESSMENT RISKS AND IMPACTS INVENTORY COMPONENT ENVIRONMENTAL ASPECT OR HAZARD PREPARATION WORKS PERMANENT DAMWATER INTAKECOMMISSIONING SURFACE WATER DIVERSION SITE CLEARING COFFER DAM CONSTRUCTION EXCAVATION TO BASE LEVEL MATERIALS MANAGEMENT DAM WALL CONSTRUCTION COMPLEMENTARY WORKS EXCAVATION OF PORTAL TUNNEL ADVANCE WASTE ROCK REMOVAL WATER MANAGEMENT FILLING OF RESERVOIR DAMMING OF RIVER FLOW DISCHARGE OF FLOOD FLOWS GEOMORPHOLOGY MODIFICATION OF SLOPESRRII IRI R LANDSLIDE IN CATCHMENTRR R R MODIFICATION OF WATER COURSESI I II SOIL REMOVAL / DISTURBANCE OF SOILRR I RI R INCREASED EROSION RATERR RR R R HYDROLOGY MODIFICATION OF FLOW REGIMEI I I III MODIFICATION OF SLOPE RUNOFFRR RI R INCREASED SEDIMENT LOADRR R RR I MODIFICATION OF RECHARGE TO GROUNDWATER I I III FLOOD EVENTS IN CATCHMENTR R I EXPECTED IMPACT R ENVIRONMENTAL RISK R EFFECT ON GEOHAZARD RISK R ENHANCED ENVIRONMENTAL RISK

8. RISK BASED ENVIRONMENTAL ASSESSMENT RISK-BASED ENVIRONMENTAL ASSESSMENT Simon Catchpole Porto, May 2012 www.bgcengineering.ca