2012-03-14_REVISION - P2010026 (4)

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6.4.8. Cuttings and Drill Water Disposal The cuttings to be disposed of onsite are those comprising strata from ground surface to a depth of 1840 ft, which is top of the L4 water bearing unit. Drilling fluid consists of domestic water mixed with formation water. All remaining cuttings and associated brine from the L4 will be transported from the site and disposed of at a licensed facility. 6.5. Development Methods, In Situ Methodology 6.5.1. Operational Phases and Timeline The East RDD Pilot will span — 61/2 to 10 years, more or less depending on leaching progress, pyrolysis, and cooling time. Projected project initiation date may be extended depending on the time needed for permitting (Figure 2). The minimum assumes all permitting is approved by 2012; the maximum presumes longer. 6.5.1.1. Construction and Leaching Phase The initial drilling and primary construction phase requires — 8 -10 months. This phase entails drilling of all wells plus construction of all the fluid heating, pumping, and product recovery units. Grading, drainage, road, and most building construction will take place during this initial construction phase. Nahcolite leaching is expected to take —8 - 16 months: longer if the target leach rate is lower than expected or if operational issues arise. During the leaching and recovery phase, construction outside the leach and heating well pattern will commence. Part of the construction to support the heating phase may commence during the leaching phase. Additional time will be needed after the leaching phase to convert the leach well to a heater well, to mount the heaters, and to convert nahcolite solution collection trains to produced water collection from the separator. This construction period is anticipated to take about 6 months after leaching. 6.5.1.2. Heating Phase Heating of the 13 heater wells is expected to require — 2- years. Heating will be turned off after —75% of the pyrolysis phase has passed. Heat flow will continue from the high temperature region near the heaters to the lower temperature regions after the heaters are off, enabling pyrolysis effects to reach the entire target resource. 6.5.1.3. Cooling Phase Two options are discussed for the cooling phase: natural cooling and water assisted cooling. Natural cooling is modeled to require approximately 1,000 days, while water assisted cooling may take 300 to 450 days, more or less depending on when water injection is initiated (Figure 26). The timelines (Figure 2) assume water assisted cooling. Notice of Intent 39 Shell Frontier Oil & Gas Inc. December 2010