2 David Low Way - Attachment 6 - UXO Assessment - OPEC

                                                                        OPEC - 2 David Low Highway, Castaways Beach
                                                                                           Rev 02 – AFU – 10 Aug 2017


INHERENT (UNMITIGATED) RISK RATINGS
The inherent (or unmitigated) risk is based on the assumption that no controls are in place. This may
overestimate the risk as it is unlikely that no controls whatsoever are in place. However this
approach then ensures all controls are noted to demonstrate that the risk has been controlled to
ALARP. The main risk events, consequences/impacts and the assessed risk ratings for unmitigated
general scenarios are summarised in Table 3 below:
                              Table 3 - Risk Ratings - Inherent (Unmitigated) Risk Scenarios
                                                                                      Risk Ratings & Scores
             Risk Event                  Consequence Type        Controls   Probability    Consequence Risk Score &
                                                                              Term           Term           Term
                                                                                                              4
                                          H&S                   None         Likely      Catastrophic
                                                                                                          Extreme
                                                                                                             17
                                          Environment           None        Unlikely      Moderate
                                                                                                          Medium
                                                                                                             13
Explosion                                 Reputation            None         Likely       Moderate
                                                                                                            High
                                                                                                              8
                                          Legal                 None         Likely         Major
                                                                                                          Extreme
                                                                                                             13
                                          Financial/ Schedule   None         Likely       Moderate
                                                                                                            High
                                          H&S                   None          N/A            N/A           N/A
                                          Environment           None          N/A            N/A           N/A
                                                                                                            18
                                          Reputation            None         Likely         Minor
Find, sight or uncover EO/EOW                                                                             Medium
(no explosion or release)                                                                                   18
                                          Legal                 None         Likely         Minor
                                                                                                          Medium
                                                                                                            13
                                          Financial/ Schedule   None         Likely       Moderate
                                                                                                           High
                                                                                                            21
                                          H&S                   None        Unlikely        Minor
                                                                                                           Low
                                                                                                            25
                                          Environment           None          Rare       Insignificant
                                                                                                           Low
Exposure to or release of EO
                                                                                                            21
Chemicals                                 Reputation            None        Unlikely        Minor
                                                                                                           Low
                                                                                                            15
                                          Legal                 None          Rare          Major
                                                                                                           High
                                                                                                            20
                                          Financial/ Schedule   None          Rare        Moderate
                                                                                                          Medium
                                          H&S                   None          N/A            N/A           N/A
                                          Environment           None          N/A            N/A           N/A
                                                                                                             9
                                          Reputation            None         Likely       Moderate
                                                                                                            High
Perception of EO/UXO risk
                                                                                                             23
                                          Legal                 None          Rare          Minor
                                                                                                            Low
                                                                                                             9
                                          Financial             None         Likely       Moderate
                                                                                                            High




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