Colorado Oil and Gas Emission Source Regulations

Oil and Gas Sector Emission Source Category Statewide NAA Reference Condensate Tanks Control tanks @ 95% 1st 90 days of production (new/modified) x Reg. 7, XII.D.1 Control tanks @ 95 % located at gas-processing plants if condensate is not stabilized and if uncontrolled actual VOC emissions ≥ 2 tpy x Reg. 7, XII.G.2 Control tanks if uncontrolled actual VOC emissions are ≥20 tpy @ 95% (existing, new, modified) x Reg. 7, XVII.C.1 System-wide approach 1 : x Reg. 7, XII.D Control tanks within system to an average emission reduction of 85% across system during 2010 ozone season and 70% during remainder of year (new/modified/existing) x Reg. 7, XII.D.2.a.(ix) Control tanks within system to an average emission reduction of 90% across system during 2011 and 2012 ozone season and 70% during remainder of year, through 4/30/13 (new/modified/existing) x Reg. 7, XII.D.2.a.(x) Glycol Dehydrators Control dehys with uncontrolled actual VOC emissions ≥ 15 tpy @ 90% (existing, new, modified) x Reg. 7, XII.H and XVII.D Pneumatic Controllers Install no- or low-bleed for new applications (new/modified on or after 2/1/09)2 x Reg. 7, XVIII.C.1 Replace or retrofit high-bleed with no- or low-bleed (existing prior to 2/1/09 ) x Reg. 7, XVIII.C.2 Reciprocating Internal Combustion Engine (RICE) Emission standards for RICE with horsepower ≥100 and < 500 that were constructed or relocated on or after implementation date shall be: 2.0 g/hp-hr NOx, 4.0 g/hp-hr CO, and 1.0 g/hp-hr VOC x Reg. 7, XVII.E.2.b Emission standards for RICE with horsepower ≥ 100 and < 500 that were constructed or relocated on or after implementation date shall be: 1.0 g/hp-hr NOx, 2.0 g/hp-hr CO, and 0.7 g/hp-hr VOC x Reg. 7, XVII.E.2.b Emission standards for RICE with horsepower ≥500 that were constructed or relocated on or after implementation date shall be: 2.0 g/hp-hr NOx, 4.0 g/hp-hr CO, and 1.0 g/hp-hr VOC x Reg. 7, XVII.E.2.b Emission standards for RICE with horsepower ≥ 500 that were constructed or relocated on or after implementation date shall be: 1.0 g/hp-hr NOx, 2.0 g/hp-hr CO, and 0.7 g/hp-hr VOC x Reg. 7, XVII.E.2.b Rich burn RICE with horsepower > 500 constructed or modified before 2/1/09 shall install/operate a non-selective catalyst reduction and an air fuel controller unless it can not be installed for less than $5000 per ton of combined VOC and NOx emission reductions x Reg. 7, XVII.E.3.a Lean burn RICE with horsepower > 500 constructed or modified before 2/1/09

shall install/operate an oxidation catalyst unless it can not be installed for less than $5000 per ton of VOC emission reductions x Reg. 7, XVII.E.3.b V OC Control Flares Combustion device used to control VOCs from condensate tanks shall be enclosed, have no visible emissions, and be designed so observer can visually determine proper operation x Reg. 7, XII.C.1.d Combustion device used to control VOCs from condensate tanks and glycol dehydrators shall be enclosed, have no visible emissions, and be designed so observer can visually determine proper operation x Reg. 7, XVII.B.1.c Water Storage Pond or Evaporation Pond VOCs may not be disposed of by evaporation unless RACT is used x Reg. 7, V.A
Notes: 1 System wide control: Companies that have multiple tank batteries in a non-attainment area must control their entire system o f tanks in the non-attainment area to a certain level of control. No specific tank must be controlled (unless it falls under another regulation), and contro ls may be moved around the system. All tanks that have uncontrolled actual VOC emissions > 2 tpy are considered to be part of the system. 2 Pneumatic controllers shall be low-bleed unless it can be shown that high-bleed controllers must be used for technical/safety reasons.

11/29/2010 Page 1 of 2Colorado Oil and Gas Emission Source Regulations

Oil and Gas Sector Emission Source Category Statewide Three County 1 Reference Condensate Tanks

Control tanks with actual uncontrolled VOC emissions ≥5 tpy @ 95% (existing, new, modified) if within 1/4 mile of affected building 2 x COGCC HB-07-1341, Section 805.b(2)A Crude Tanks

Control tanks with actual uncontrolled VOC emissions ≥5 tpy @ 95% (existing, new, modified) if within 1/4 mile of affected building 2 x COGCC HB-07-1341, Section 805.b(2)B Fugitive Emissions

Fugitive dust shall be controlled by Best Management Practices x COGCC HB-07-1341, Section 805.c Glycol Dehydrators Control glycol dehyrators with actual uncontrolled VOC emissions ≥5 tpy @ 90% (existing, new, modified) if within 1/4 mile of affected building 2 x COGCC HB-07-1341, Section 805.b(2)C Pits

Pits constructed after the implementation dates with actual uncontrolled VOC
emissions ≥ 5 tpy shall not be located within 1/4 mile of an affected building2 x COGCC HB-07-1341, Section 805.b(2)D Pneumatic Controllers

Install no- or low-bleed for new applications (new/modified on or after 10/1/09)3 x COGCC HB-07-1341, Section 805.b(2)E Produced water tanks

Control tanks with actual uncontrolled VOC emissions ≥ 5 tpy @ 95% (existing, new, modified) if within 1/4 mile of affected building 2 x COGCC HB-07-1341, Section 805.b(2)B Well Completions

Green completions shall be used when technically and economically feasible. If not feasible, Best Management Practices shall be used. x COGCC HB-07-1341, Section 805.b(3)

NOTES: 1 These COGCC rules apply to three Western Slope counties: Garfield, Mesa, and Rio Blanco

3 Pneumatic controllers shall be low-bleed unless it can be shown that high-bleed controllers must be used for technical/safety reasons. 2 Colorado Oil and Gas Conservation Commission (COGCC) HB-07-1341 rule language refers to potential-to-emit (PTE) emissions; h owever, a guidance document indicates that PTE shall be considered to be uncontrolled actual emissions. An affected building may be a building un it, educational facility, assembly building, hospital, nursing home, board and care facility, jail, or designated outside activity area.

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