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Antero Resources Battlement Mesa Natural Gas Development Plan Meeting 7 (TPD0910034)

Antero Resources

Battlement Mesa Natural Gas Development Plan

Meeting #7

Envirnonmental Program – Air Quality and Water Resource Protection and Noise, Dust, Weed, Light, and Visual Mitigation

October 7, 2009

BMOGC Meeting Series – Brief Overview


  • July 1st – Introductory Meeting (define future mtgs and public involvement process)
  • July 29th – Pad Locations, Facilities, and Setbacks
  • August 5th – Surface Use Agreement
  • August 19th – Drilling Schedule and Pace
  • September 2nd – Traffic Plan
  • September 16th – Drilling, Completion, and Water Management Plan
  • October 7th– Environmental Program
    • October 21st – Emergency Response Plan and Pad Security Plan
    • November 4th – Post Drilling and Completion Operations and Interim Reclamation



(All meetings are open to the public and times are posted in Grand Valley Echo and on battlementmesacolorado.com website)


Slide 2


Today’s Meeting Purpose

  • Review Major Aspects of Environmental Program

–     Air Quality and Odor Mitigation

–     Surface Water Resource Protection

  • Spill Prevention
  • Stormwater/Erosion Control

–     Mitigation Strategies

  • Noise
  • Dust
  • Light
  • Weeds
  • Visual/Aesthetics
  • Question and Answer Session

Slide 3



Air Quality Modeling Study – Brief Overview

  • What are the major potential emission sources involved in natural gas development?Temporary

–      Truck Traffic and Construction of Pads and Pipelines – fugitive dust

  • Controls = reduce traffic (water pipeline), gravelling pads and dust suppression via water/Soiltac®

–      Drilling Rig Generators – diesel fumes and exhaust emissions

  • Controls = electric grid power-substitute for diesel generators, low NOX engines where grid unavailable

–      Drilling Reserve Pits

  • Controls = pitless drilling

–      Fraccing Operations – diesel fumes and exhaust emissions, flowback tanks

  • Controls = Green completion skids and covered flowback tanks

Long Term

–      Production Tanks – VOC emissions from condensate flashing (> 90% of potential)

  • Controls = Combustor flare controls and automatic igniters

–      Separators and Wellheads – fugitive VOC emissions from valves and flanges

  • Controls = Low bleed valves and routine maintenance of connection integrity

–      Water Handling Facility – VOC and bacterial odors

  • Controls = Eliminate through use of covered pit design and vapor collection/combustion

Slide 4



Air Quality Modeling Study – Brief Overview

  • What did Antero model and why?
    • The community expressed concerns about air quality

−    Expansion of voluntary Antero programs

  • Antero modeled VOC emissions from production tanks because:

–          Continuous source of emissions over the productive life of a natural gas well

–          Uncontrolled emissions can be relatively significant compared to the other emission sources

  • Purpose of modeling study

−   To identify and evaluate the potential air quality impacts at nearby residences from production tanks at planned well pads

Slide 5



Air Quality Modeling Study – Brief Overview

  • Potential Air Quality Impacts

–      EPA approved air model (AERMOD) used to estimate air quality impacts

–      Air Quality Impacts = Predicted benzene concentrations around well pads

–      EPA model used Rifle Airport meteorological data and worst case production tank emission rates

  • Modeled Benzene Concentrations

–      Compared to EPA Health Based Standards and

–      Colorado Air Monitoring Data

  • Conclusion – Modeled Worst Case Benzene Concentrations at Nearby Residences Are Significantly Below EPA Health Based Standard

Slide 6



Modeling Inputs – Worst Case Emissions Scenario

  • Assumptions

–        No tank emission controls

–        Up to 20 wells on a completed pad (2x Antero actual dev. plans)

–        11 proposed pads

–        1.78 bbls condensate per MMscf  (Grand Valley and Parachute Field)

–        Each well makes 2 MMscf/day

–        Each pad was modeled assuming 75 bbls/day condensate

  • Antero Tank Emission Factor

–        EPA Approved Model (E&P Tanks 2.0) –  Used  to determine condensate tank VOC/benzene emission rates

–        Uncontrolled Benzene emissions ~ 0.36 tpy from each well pad

–        Uncontrolled Emission Factor = 0.026 lbs benzene/bbl condensate

Slide 7



Modeling Inputs – Worst Case Emissions Scenario (cont.)

  • Why Model Worst Case Uncontrolled Emission Scenario?

–        Actual production tank well pad emissions controlled by flare with potential to be fitted with auto igniter

–         Actual modeled emissions (controlled) will be significantly less than worst case modeled emissions (uncontrolled)

–         If worst case modeled benzene concentrations are below EPA health based standards then actual benzene impacts will be significantly less



Modeling Inputs – Meteorology

  • Used a Rifle Airport 5-yr meteorological dataset
  • Rifle Airport dataset provided by Colorado Department of Public Health & Environment (CDPHE)
  • Rifle Airport – Wind direction/speed data

–      Most representative of Battlement Mesa meteorological conditions

–      Prevailing wind direction are from west and south (see Rifle Airport Wind Rose Slide)

  • Rifle Airport – Terrain influences

–      Similar to Battlement Mesa

–      Both locations immediately south of river and I-70

–      Rifle Airport at 5,500 ft, Battlement Mesa at 5,100 to 5,500 ft

  • Closet meteorological dataset is Williams’ Parachute Creek Gas Plant (PCGP), however it was not used because:

–       Located in Grand Valley oriented NW to SE

–       PCGP Wind Rose shows prevailing winds parallel to Grand Valley

–       Dataset limited to 1-yr

Slide 9


Modeling Inputs – Rifle Airport Wind Rose


Dominate Wind Directions




Air Quality Modeling – Predicting Impacts from Well Pad Production Tanks

  • Modeled potential offsite impacts at “Receptors” out to 1,500 feet in all directions from each well pad location

  • Receptor = residence, golf course clubhouse, schools, etc.

  • Impacts = Modeled 24-hr Benzene Concentrations

  • Identified location of Potential Maximum 24-hr impacts relative to each pad location

  • Modeled Results – See Area Specific Well Pad Impact Maps

–      Area specific maps include setback distances

  • 350 ft – COGCC Setback in high density areas
  • 500ft – Antero Internal Setback
  • 1,000 ft

Slide 11



Benzene Air Quality Data – Monitored

  • Compared modeled worst case uncontrolled 24-hr benzene concentrations to monitoring data in Denver, Grand Junction and Piceance Basin.

  • Average monitored 24-hr benzene concentrations

–           Denver = 2.5 to 3.2 µg/m3   (data collection follows EPA monitoring protocols)

–           Grand Junction = 1.6 µg/m3  (data collection follows EPA monitoring protocols)

–           Parachute = 3 µg/m3 (likely less than 3 µg/m3 because benzene “non-detects” not counted – Garfield County monitoring data)

  • Benzene monitoring data for Colorado are presented in following table




Monitoring Data – Benzene Background


Benzene Monitoring Results in Colorado

– 24-hr Measured Concentrations




24-hr Conc. (ug/m3)



1Denver – Urban Site 1



1Denver – Urban Site 2



1Denver – Urban Site 3



2Grand Junction (Powell)



Glenwood – Courthouse



New Castle – Library



Rifle – Henry Bldg






Silt – Cox



Silt – Bell









West Landfill










1 Denver data from 2003 monitoring project

2 Grand Junction 2006-2007 data (Powell site)

* Garfield County date from 2005-2007 study


Benzene Air Quality Data – Modeled

–       Worst case modeled benzene concentrations were compared to:

  • EPA acceptable 24-hr exposure of 30 µg/m3 = benzene health based standard (U.S. EPA. Integrated Risk Information System (IRIS) on Benzene. National Center for Environmental Assessment, Office of Research and Development, Washington, DC. 2002)

–       Residential (receptor) locations are all below the EPA standard of 30 µg/m3

–       9.2 µg/m3 was the highest modeled 24-hr concentration (house north of N Pad). (maximum out of 365 X 5 yrs = 1825 days)

–       Background benzene 24-hr concentration of 3 µg/m3 in Parachute was added to modeled results for comparison to the health based 24-hr standard.

–       Maximum Modeled benzene 24-hr concentrations for each well pad are presented in the next slide.




Benzene AERMOD Results – All Pads


Antero Resources – All Proposed Production Pads

Table 1: AERMOD Modeled Benzene Impacts from Uncontrolled Tank Emissions

– Rifle Garfied County Airport Meteorological Data

Maximum Modeled Benzene Concentrations (µg/m3)

Distance to Sensitive Receptor (feet)

Closest Sensitive Receptor2

Average of Monitored Benzene Samples

collected in Parachute


Comparison To Acceptable Health-Based Threshold Concentrations (µg/m3)

Pad Location

24-hr (acute)

24-hr Background

Acute (24-hr) – EPA1

Acute (24-hr) – Utah TLV2

Pad N





30 (µg/m3)

53 (µg/m3)





Watson Pad





Pad A





Pad B





Pad C





Pad D





Pad E





Pad G





Pad K





Pad L





Pad M





** Acute exposures are considered short-term 24-hr exposures

1 EPA accepted standard for short-term exposures below which no inhalation health impacts are anticipated



Air Quality – Base Map

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Slide 16



Air Quality – Southeastern Pads

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Slide 17



Air Quality – Southwestern Pads

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Slide 18



Air Quality – Northern Pads

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Slide 19



Air Modeling Study – Conclusions

  • The modeled benzene concentrations at or above the EPA health based standard of 30 µg/m3 do not extend beyond pad boundaries


  • The modeled benzene concentrations at ALL residential receptors are between 3.2 and 9.2 ug/m3 – well below the 24-hr EPA acceptable exposure threshold of 30 ug/m3 (includes background)


  • Antero installed control measures will reduce incremental benzene emissions by approximately 95%


  • The highest modeled benzene concentration (worst case scenario) at nearest residence is about 30% of the acceptable EPA health based standard, average is                           about 19% of the acceptable EPA health based standard



Air Quality – Odor Mitigation

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  • All tank venting emissions are routed to a VOC combustor
  • VOC combustor will operate with igniter





Slide 21



Air Quality – Odor Mitigation

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  • Purpose is to eliminate odor/VOC releases to atmosphere
  • Gas is routed to the sales line instead of vented/flared


Slide 22



Air Quality – Odor Mitigation



Storage tanks enclosed for odor control

 Picture Placeholder

Slide 23



Air Quality – Odor Mitigation

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Example of Cover Technology for Water Handling Facilities

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Water Storage and Treatment Facility (Pad F)


Slide 24


Air Quality – Summary

  • Well Pads – potential air emissions reduced and/or eliminated with controls or design (e.g. electric power from grid)

  • Production Tank Air Quality Modeling Study

−     Dr. Walker of Mesa State said during his August 2, 2009 GVCA annual meeting that “air quality modeling is a useful predictive tool for estimating exposures to VOC emissions from oil and gas.”

−     The modeled benzene concentrations at ALL residential receptors are well below the 24-hr EPA acceptable exposure threshold of 30 ug/m3

Slide 25

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