Page 345 - Pipeline Risk Management Manual Ideas, Techniques, and Resources

Table 3 Overall risks
Overall Risks
Estimated Frequency of Annual
Average Leak Leak Count Impact over Frequency
Rateper for 700 Miles Lije of Project (XI 000)
Case if: Mile-Year and 50 Years Impact for Impact Notes
~~
1 Industry 0.001 35 Drinking water 0.27 5.35
average contamination
reportable
leak rate
applies
Fatality 0.16 3.21 4
lnjury 0.72 14.42 4
Recreational 2.80 55.96
water
contamination
Prime 1.06 21.14
agricultural
land
contamination
Wetlands 1.65 32.92
contamination
2 Pre-mitigation 0.0007' 26.8 Drinking water 0.20 4.10 10 reportable
reportable contamination p50 bbl)
leak rate over
continues 450 miles
in 29 years
Fatality 0.12 2.46 4
Injury 0.553 11.05 4
Recreational 2.14 42.88
water
contamination
Prime agricultural 0.81 16.20
land
contamination 1.26 25.22
Wetlands
contamination
3 Pre-mitigation 0.001992 69.1 Drinking water 0.23 4.69
leak rate contamination
continues
Fatality 0.14 2.82
Injury 0.63 12.65
Recreational 2.45 49.06
water
contamination
Prime agricultural 0.93 18.53
land
contamination
Wetlands I .44 28.86
contamination
4 Post-mitigation 0.000073 2.6 Drink water 0.005 0.10
leak rate contamination
estimate
Drinking water 0.003 0.051
contamination,
no MTBE
Fatality 0.005 0.11 4
Injury 0.024 0.47 4
Recreational water 0.087 1.14
contamination
Prime agricultural 0.035 0.70
land
contamination
Wetlands 0.051 1.01
contamination