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Analysis of Unmitigated Environmental Risk by swl18050

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									PRELIMINARY PROJECT OUTLINE           - 49 -                       ROCLA MATERIALS PTY LTD
AND ENVIRONMENTAL ASSESSMENT                                Calga Sand Quarry Southern Extension
                                                                               Report No. 664/01




                         APPENDIX 1
                   (No. of pages excluding this page = 4)


   Analysis of Unmitigated Environmental Risk




                               R. W. CORKERY & CO. PTY. LIMITED
ROCLA MATERIALS PTY LTD                          - 50 -                     PRELIMINARY PROJECT OUTLINE
Calga Sand Quarry Southern Extension                                      AND ENVIRONMENTAL ASSESSMENT
Report No. 664/01




                                   This page has intentionally been left blank




                                        R. W. CORKERY & CO. PTY. LIMITED
PRELIMINARY PROJECT OUTLINE                             - 51 -                     ROCLA MATERIALS PTY LTD
AND ENVIRONMENTAL ASSESSMENT                                                Calga Sand Quarry Southern Extension
                                                                                               Report No. 664/01

                                                  Appendix 1
                                   Analysis of Unmitigated Environmental Risk
                                                                                                        Page 1 of 4

    Potential                                                             Consequence of Likelihood of
                                                                                                       Unmitigated
  Environmental             Level / Scale of Impact (if applicable)        Occurrence if Occurrence if
                                                                                                       Risk Rating
     Impacts                                                               not Mitigated not Mitigated

                                                       Groundwater
Groundwater           Contamination requiring minor recovery works              2              D           M
Pollution by
leaking/spilt         Contamination requiring major recovery works              4              E            H
hydrocarbon
                      Restricted to the Project Site                            1              A            H
                      Impacting on aquifers beyond the Project Site but
                      restricted to within 100m.                                2              B            H
Drawdown of
                      Impacting on aquifers beyond the Project Site
groundwater levels                                                              3              C            H
                      between 100m and 500m.
                      Impacting on aquifers beyond the Project Site
                      beyond 500m.                                              4              C            E

                      Impacts restricted to groundwater bores on the
                      Project Site, or Proponent owned land.                    1              A            H
Reduction in          Reduction in yield of <15% of non-project related
groundwater bore      bores                                                     2              B            H
yields
                      Reduction in yield of >15% of non-project related
                      bores                                                     3              C            H

                                                       Ecology
                     Disturbance to native vegetation / habitat within
Loss of, or          nominated areas                                            2              A            H
alteration to,
                     Disturbance to native vegetation / habitat outside
existing habitats.                                                              3              D           M
                     nominated areas
                    Disturbance to Threatened flora / fauna and
Direct adverse      endangered communities                                      3              C            H
impact on           Disturbance leading to local population reduction           4              D            H
threatened species.
                    Disturbance leading to local extinction(s)                  5              E            E
Reduced              Local biodiversity                                         3              D           M
biodiversity         Regional biodiversity                                      4              D            H
Impacts on Groundwater Dependent Ecosystems                                     3              C            H
                                   Surface Water and Erosion and Sediment Control
Altered drainage on Project Site                                                2              A           H
Reduced            Stressing of downstream native vegetation due to
catchment of local restricted flows                                             3              C           H
drainage
Consequence of Occurrence: 1 = Insignificant; 2 = Minor; 3 = Moderate; 4 = Major; 5 = Catastrophic
Likelihood of Occurrence: A = Almost Certain; B = Likely; C = Possible; D = Unlikely; E = Rare
Risk Rating: E = Extreme; H = High; M = Moderate; L = Low




                                             R. W. CORKERY & CO. PTY. LIMITED
ROCLA MATERIALS PTY LTD                                - 52 -                    PRELIMINARY PROJECT OUTLINE
Calga Sand Quarry Southern Extension                                           AND ENVIRONMENTAL ASSESSMENT
Report No. 664/01

                                                 Appendix 1
                                  Analysis of Unmitigated Environmental Risk
                                                                                                                  Page 2 of 4

    Potential                                                                       Consequence Likelihood of
                                                                                                                  Unmitigated
  Environmental               Level / Scale of Impact (if applicable)               of Occurrence Occurrence if
                                                                                                                  Risk Rating
     Impacts                                                                       if not Mitigated not Mitigated

                            Surface Water and Erosion and Sediment Control (Cont’d)
                     Isolated and minor event resulting in temporary
                     degradation of water quality in local creeks and                    2              A            H
                     tributaries.
                   Continuing discharge of dirty water resulting in ongoing
Reduced quality of degradation of water quality in local creeks and                      3              B            H
downstream waters tributaries.
                   Isolated and major event resulting in temporary but
                   wider spread degradation of water quality.                            3              C            H

                     Repeated major event resulting in long-term and wide
                     spread degradation of water quality.                                4              C            E

Changes to local flooding patterns and indirect impacts on native vegetation
communities and ecosystems.                                                              3              C            H

Soil erosion         Erosion of drainage lines, stockpiles or created slopes             2              B            H
                                                  Aboriginal Heritage
Impact on identified sites and/or artefacts of Aboriginal cultural heritage as a
result of the proposed construction and extraction activities and without the            4              C            E
permission of LALC or DEC
Impact on unidentified sites and/or artefacts of Aboriginal cultural heritage
as a result of the proposed construction and extraction activities and without           3              C            H
the permission of LALC or DEC
                                                     Noise
                     Occasional minor exceedance of noise criteria (1-
                     2dB(A))                                                             2              C            M

Increased noise      Regular minor exceedance of noise criteria (1-2dB(A))               3              C            H
levels associated    Occasional marginal exceedance of noise criteria (3-
with Project Site    5dB(A))                                                             2              C            M
activities causing
                     Regular marginal exceedance of noise criteria (3-
annoyance,                                                                               3              C            H
                     5dB(A))
distractions, i.e.
amenity impacts.     Occasional major exceedance of noise criteria
                     (>5dB(A))                                                           2              C            M

                     Regular major exceedance of noise criteria (>5dB(A))                4              D            H
                     Occasional minor exceedance of noise criteria (1-
                     2dB(A))                                                             2              C            M

                     Regular minor exceedance of noise criteria (1-2dB(A))               3              C            H
                     Occasional marginal exceedance of noise criteria (3-
                     5dB(A))                                                             2              C            M
Increased traffic
noise levels.        Regular marginal exceedance of noise criteria (3-
                     5dB(A))                                                             3              C            H

                     Occasional major exceedance of noise criteria
                     (>5dB(A))                                                           2              C            M

                     Regular major exceedance of noise criteria (>5dB(A))                4              D            H
Maximum noise levels resulting in sleep disturbance.                                     2              D            L
Consequence of Occurrence: 1 = Insignificant; 2 = Minor; 3 = Moderate; 4 = Major; 5 = Catastrophic
Likelihood of Occurrence: A = Almost Certain; B = Likely; C = Possible; D = Unlikely; E = Rare


                                              R. W. CORKERY & CO. PTY. LIMITED
 PRELIMINARY PROJECT OUTLINE                         - 53 -                          ROCLA MATERIALS PTY LTD
 AND ENVIRONMENTAL ASSESSMENT                                                 Calga Sand Quarry Southern Extension
                                                                                                 Report No. 664/01

Risk Rating: E = Extreme; H = High; M = Moderate; L = Low

                                                Appendix 1
                                 Analysis of Unmitigated Environmental Risk
                                                                                                             Page 3 of 4

    Potential                                                                  Consequence Likelihood of
                                                                                                             Unmitigated
  Environmental              Level / Scale of Impact (if applicable)           of Occurrence Occurrence if
                                                                                                             Risk Rating
     Impacts                                                                  if not Mitigated not Mitigated

                                                 Traffic and Transport
Increased traffic congestion                                                        3              D            M
Road pavement deterioration                                                         3              C            H
                     Minor accident - no injury.                                    2              C            M
Elevated risk of     Minor accident - minor injury.                                 3              D            M
accident/incident
                     Major accident -moderate injuries.                             4              E             H
on local roads
                     Severe accident - severe injuries or death injury.             5              E             H
                                                      Air Quality
                      Deposited dust levels attributable to the project
                      occasionally (for one or two months every year) above         2              C            M
                      DEC guideline, affects only adjacent landholders.
Nuisance -
                      Deposited dust levels attributable to the project
deposited dust
                      regularly (exceedances greater than DEC guideline for
                      >5 months per year) affects landholders some                  3              C             H
                      distance from the Project Site.
                      PM10 levels attributable to the project occasionally
                      (once every 1 to 2 years) above the project goal,             2              C            M
                      affects only adjacent landholders.
Health - PM10
                      PM10 levels attributable to the project occasionally
                      (>5 times per year) above the project goal, affects           3              C             H
                      landholders some distance from Project Site.
                      Occasional air borne silica and elevated
                      concentrations received at surrounding residences.            3              E            M
Airborne Silica
                      Regular air borne silica and elevated concentrations
                      received and surrounding residences.                          4              E             H

Greenhouse Gas Emissions                                                            1              B            M
                                           Land Use and Land Capability
Decreased viability For the life of the project                                     3              C             H
of surrounding land
uses                   Beyond the life of the project                               3              B             H
Conservation value of the Project Site decreased leading to increased
                                                                                    3              C             H
vulnerability of local threatened species.
Insufficient soil quantities for rehabilitation.                                    3              C            H
Reduced soil           Temporary disturbance to soil                                1              B            M
quality                Degradation of soil quality                                  2              C            M
Elevated erosion or erosion potential.                                              2              C            M
Decreased land and agricultural capability of the final landform                    3              C             H
                                                  Visual Amenity
Reduced amenity      Temporary disturbance to landform                              1              A             H
of altered Project   Marginally identifiable change to landscape                    2              A             H
Site landform        Highly identifiable change to landscape                        3              C             H
Consequence of Occurrence: 1 = Insignificant; 2 = Minor; 3 = Moderate; 4 = Major; 5 = Catastrophic
Likelihood of Occurrence: A = Almost Certain; B = Likely; C = Possible; D = Unlikely; E = Rare
Risk Rating: E = Extreme; H = High; M = Moderate; L = Low




                                             R. W. CORKERY & CO. PTY. LIMITED
ROCLA MATERIALS PTY LTD                            - 54 -                  PRELIMINARY PROJECT OUTLINE
Calga Sand Quarry Southern Extension                                     AND ENVIRONMENTAL ASSESSMENT
Report No. 664/01




                                              Appendix 1
                               Analysis of Unmitigated Environmental Risk
                                                                                                         Page 4 of 4

   Potential                                                               Consequence Likelihood of
                                                                                                         Unmitigated
 Environmental             Level / Scale of Impact (if applicable)         of Occurrence Occurrence if
                                                                                                         Risk Rating
    Impacts                                                               if not Mitigated not Mitigated

                                    Socio-Economic Impacts and Property Values
Reduced quality of life (actual or perceived)                                  3               D            M
                   Temporary decrease in property values                        2              C            M
Reduced property
                   Moderate term decrease in property values                    3              C             H
values
                   Long term decrease in property values                        3              D             H
                                              Waste Management
Contamination by
                   Contamination requiring major recovery works                 3              E            M
waste oil.
Reduced amenity of Project Site due to poor rubbish, litter management          1              C             L
Consequence of Occurrence: 1 = Insignificant; 2 = Minor; 3 = Moderate; 4 = Major; 5 = Catastrophic
Likelihood of Occurrence: A = Almost Certain; B = Likely; C = Possible; D = Unlikely; E = Rare
Risk Rating: E = Extreme; H = High; M = Moderate; L = Low




                                           R. W. CORKERY & CO. PTY. LIMITED

								
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