HVHF / Well completion. Drilling, casing and cementing. Human NA Low/Minor Low/Minor Low/Minor NA. Human NA Low/Minor Low/Minor Low/Minor NA

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1 Appendix A: Risk Ranking Summary Chart from all combined with probability/consequence descriptions and color coded by overall risk ranking (no color = low risk; yellow = moderate risk; red = high risk; grey = insufficient info.) Cells marked with are not assessed because risks are not anticipated. References are provided to corresponding appendices where risk information is found. Aspect Blowout Blowout Combustion from pumps, drill rigs, and compressors Drilling through coalbed Contaminat io ground water or surface surface spill or release Explosion/f ire/ contaminati on NOx, benzene, PM Methane HVHF / Human Human Human for Scenario 1 for Scenario 2 Insufficient data Appendix D Table 1 (Tables 15, 18-20) Tables 11, 15, Pages 5, 6, 13

2 Flaring CO 2, PM Human Noncombustion VOCs, methane, NGLs Human / HVHF / /Min or Proppant use Silica Human Releases from pipes, valves, fittings Separators and storage tanks Storage of flowback, venting and separation events Noncombusti on emissions from trucks Combustion emissions from trucks Methane VOCs, methane, NGLs Methane, H 2 S, VOCs, NGLs, BTEX Human / Human Dust/PM Human NOx, benzene, PM Human for Seismic Assessment Insufficient data Insufficient data for Scenario 1 for Scenario 2 Insufficient data Insufficient data Table 15 Table 11 Tables 18 and 19 Table 20 Table 11 Tables 18 & 19 Tables 8, 11, 15, Tables 8, 11, 15, 18-20

3 unloadings Methane, H 2 S, VOCs Cuttings Drilling additives Drilling mud for Preparation HVHF / Human Table 20 Appendix D (Table 1) Appendix D (Table 1) Appendix D (Table 1)

4 Saline intrusion during drilling Fuel Stored s HVHF / Brine Human Brine Appendix D (Table 1) Appendix E (Table 1, Figure 3, Figure 4, and Figure 5) (Pages 5, 6, 13, 14)

5 Gathering Lines Forest fragmentati on, habitat fragmentati on, harm to aquatic and terrestrial species Flowback Fracturing additives HVHF / to Serious depending on #/location of lines and proximity to receptors Low Appendix J Page Appendix E (Table 1, Figure 5 and Figure 6) Appendix E (Table 1, Figure 2, and Figure 3)

6 Fracturing fluid Produced water HVHF / Flowback Serious Flowback Human Fracturing fluid Fracturing fluid Serious Serious Human Low Appendix E (Table 1, Figure 4, and Figure 5) Appendix E (Table 1 and Figure 6) 14) 14)

7 Produced water Produced water HVHF / Serious Human Casing Casing Human Cementing Cementing Human Compresso rs off the pad Compresso rs off the pad Compresso rs on the pad Compresso rs on the pad Constructio n activity Human / Human / 14) () () () () (Table 17) (Table 17) (Table 16) (Table 16) (Table 9, 20)

8 Visual Visual Visual Visual HVHF / Drilling Drilling Human Generators and pumps Generators and pumps Vehicle traffic Vehicle traffic Drill rigs Land clearing Lighting pad before production Human Human /,,, Human / Mode rate Moderat e () () (Table (Table (Tables 8, 9, 12, 15, 20 (Tables 8, 9, 12, 15, 20) (Table 11) (Tables 11, 18, 19, 21) (Table 14) (Table 11)

9 Visual Saline intrusion from casing and cement failure (gas well set back 2,000 feet from nearest drinking water well) pad during production and after Human / HVHF / Brine Human Methane Methane Human (Tables 18, 19, 21) (Pages 6, 7, 14)

10 (gas well set back 1 km from nearest drinking water well, road accidents Road Road Damage Methane Human Injury and death from traffic accidents, injury and death Cost of repair of road Damage to resident s vehicles from road Serious Serious HVHF / Serious Serious Serious

11 , road, road, road R oad Damage Delay of emergency vehiclesdel ay of emergency vehicles Delays and inconvenie nce (nonemergency vehicles) Increased cost of policing Increased risk of rollover, etc. from road Interferenc e with outdoor recreation Loss of rural character HVHF / Modera te Modera te Moderat e

12 HVHF / Road construction, traffic, road Traffi c Road construction, traffic, road Disposal of wastewater in UIC wells Sedimentat ion, pollution of surface waterdama ge to wildlife Forest fragmentati on, harm to wildlife Flowback and Produced water Groundwater Earthquake UIC wells Waste disposal Drilling mud, brine, cuttings, flowback in MD; in States with UIC wells in MD, High in States with UIC wells in MD; in States with UIC wells Referenced in Appendix I, page 2 Referenced in Appendix I, page 2 Appendix I Page 14

13 Water appropriation Water appropriation Withdrawal s from surface or groundwate r Withdrawal s from surface or groundwate r systems and aquatic species Local and regional water supplies and recreational activities HVHF / Appendix G (Tables 1 & 2) Appendix G (Tables 1 & 2)