WRAP O&G Workgroup Website.

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1 WRAP O&G Workgroup Website

2 Phase III Overview of Inventory Effort Inventory is conducted on a basin-by-basin level Phase III will cover most major oil and gas production basins in the Intermountain West Inventories are intended to include most major oil and gas sources including area sources and point sources but does not include mobile sources (with the exception of drilling rigs) Temporal scope considers a 2006 baseline year, 2012 midterm projections, and 2018 far future year projections Only criteria pollutants are covered: NOx, VOC, CO, SOx, PM

3 The region covered in the Phase III work includes all of the major basins of significant oil and gas activity in New Mexico, Utah, Colorado, Wyoming, Montana and North Dakota: Denver-Julesburg Basin Uinta Basin San Juan Basin (North and South) Piceance Basin Southwest Wyoming Basin (Green River Basin) Powder River Basin - Big Horn Basin - Wind River Basin - W illiston Basin - N orth-central Montana Basin (Great Plains Basin) Figure 1 below shows a map of all of the basins covered in the Phase III work. Figure 1. Basin boundaries for all basins included in the Phase III study.

4 The sources considered in this analysis include the following: Lateral/wellhead compressor engines Gas well tanks breathing losses, Drilling rigs gas venting, flashing emissions Workover rigs/frac rigs Pneumatic devices CBM pump engines Oil well fugitive emissions Salt-water disposal engines Gas well fugitive emissions Artificial lift engines (pumpjacks) Gas well completions Vapor recovery unit (VRU) Venting compressor engines Blowdowns Miscellaneous gas-fired engines Dehydrators Oil well heaters Amine units Gas well heaters Gas well truck loading Miscellaneous gas-fired heaters or Oil well truck loading boilers Pipeline/compressor station fugitive Flaring emissions Oil well tanks breathing losses, gas Landfarms venting, flashing emissions Water treatment/water injection facilities 2

5 Uinta Basin Geographic Scope Includes the following counties in Northeastern Utah: Carbon Duchesne Emery Grand Uintah Wasatch County-level emissions generated for all counties within the basin Basin boundaries re-defined to align with county boundaries to simplify county-level reporting

6 Uinta 2006 Baseline Results NOx Emissions By Source Category Basin-wide NOx total: 13,093 (tpy) Permitted Sources 18% Compressor engines 17% Dehydrator Artificial Lift 17% Drill rigs 36% Miscellaneous engines Workover rigs 2% Heaters 8% NOx emissions dominated by drilling rigs, permitted and unpermitted compressors and artificial lift engines

7 Uinta Basin 2006 Baseline Results VOC Emissions By Source Category Compressor engines Oil Tank 20% Permitted Sources 2% Drill rigs Pneumatic devices 2 Basin-wide VOC total: 71,546 (tpy) Pneumatic pumps 12% Condensate tank 9% Dehydrator 28% Venting - Compressor Shutdown Artificial Lift Unpermitted Fugitives 3% Venting - Compressor Startup Top VOC source categories include dehydrators, pneumatics and oil/condensate tanks

8 Uinta Basin 2006 Baseline Results NOx Emissions By County Basin-wide NOx total: 13,093 (tpy) 8, ,000.0 NOx Emissions (tons/year) 6, , , , ,000.0 Permitted Sources Oil Tank Condensate tank Initial completion Flaring Dehydrator Flaring Dehydrator Artificial Lift Miscellaneous engines Workover rigs Pneumatic pumps Pneumatic devices Heaters Drill rigs Condensate tank flaring Compressor engines 1, Carbon Duchesne Emery Grand Uintah County Highest NOx emissions occur in Uintah and Duchesne Counties, with some additional NOx emissions in Carbon and Grand Counties

9 Uinta Basin 2006 Baseline Results VOC Emissions By County Basin-wide VOC total: 71,546 (tpy) 50,000 45,000 VOC Emissions (tons/year) 40,000 35,000 30,000 25,000 20,000 15,000 10,000 Truck Loading of Oil Truck Loading of Condensate Permitted Sources Oil Tank Condensate tank Dehydrator Venting - Compressor Shutdown Venting - Compressor Startup Unpermitted Fugitives Venting - recompletions Venting - initial completions Venting - blowdowns Pneumatic pumps Pneumatic devices Compressor engines 5,000 0 Carbon Duchesne Emery Grand Uintah County VOC emissions occur primarily in Uintah and Duchesne Counties, with little additional VOC emissions in other counties

10 Uinta Basin 2006 Baseline Results NOx Emissions By County in the Tribal vs. Non-Tribal Airshed Basin-wide NOx total: 13,093 (tpy) 8,000 7,000 NOx Emissions (tons/year) 6,000 5,000 4,000 3,000 2,000 Non- Tribal Tribal 1,000 0 Carbon Duchesne Emery Grand Uintah NOx emissions in Uintah County are primarily within the tribal airshed, whereas in Duchesne County only approximately 60% of NOx emissions are in the tribal airshed

11 Uinta Basin 2006 Baseline Results VOC Emissions By County in the Tribal vs. Non-Tribal Airshed Basin-wide VOC total: 71,546 (tpy) 50, , ,000.0 VOC Emissions (tons/yr) 35, , , , ,000.0 Non- Tribal Tribal 10, , Carbon Duchesne Emery Grand Uintah VOC emissions in Uintah County are primarily within the tribal airshed, whereas in Duchesne County only approximately 50% of VOC emissions are in the tribal airshed

12 Uinta 2006 Baseline Emissions - Observations Well Count Oil Production (bbl) Gas Production (MCF) Spud Counts Gas Well Basin total CONV CBM Total Oil Well Oil Condensate Total CONV CBM Total D-J Basin 19,841 19, ,242, ,242, ,630, ,630, Piceance Basin 6,315 6, ,158,305 5,755,076 1,403, ,358, ,165, Uinta Basin 6,881 6, ,528,121 9,758,247 1,769, ,844, ,219,432 77,624, Emissions (tons/yr) Basin NOx VOC CO SOx PM D-J Basin 20,783 81,758 12, Piceance Basin 12,390 27,464 7, Uinta Basin 13,093 71,546 8, Uinta Basin NOx emissions resemble those of Piceance Basin for the 2006 baseline, and are lower than the D-J Basin Uinta Basin E&P activity, similar to Piceance, is more recent than in the D-J Basin Uinta Basin VOC emissions resemble those of the D-J Basin and are significantly higher than the Piceance Basin, likely due to significant oil production and higher VOC content of produced gas on a basin-wide average basis

13 Phase III Schedule Basin San Juan (North) Jan Feb Mar Apr 2009 May Jun Jul Aug Sep San Juan (South) Southwest Wyoming (Green River) Powder River Big Horn Wind River Williston Great Plains Far Future Year Projections (All Basins) Final Report Surveys sent out to producers Baseline 2006 emissions completed Mid-term, baseline emissions and documentation completed