Appendix D: Human Health Risk Assessment - Garfield County ...

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Appendix D Screening Level Human Health Risk Assessment February 2011 Battlement Mesa, Colorado Health Impact Assessment Colorado School of Public Health Acknowledgements The authors of this report would like to thank the following groups for their helpful assistance with this Human Health Risk Assessment: Garfield County Public Health for their previous and continuing work to promote public health in their county and for providing the numerous air studies they have conducted in the county and for the assistance in identifying other studies used for this report; Colorado Department of Public Health and Environment for their previous and continuing work in Garfield County and throughout the state of Colorado and for their review of this HHRA; Antero Resources for providing us with details of the natural gas project in Battlement Mesa and for assistance with understanding how natural gas development and production processes occur; the United States Geological Service for providing the database related to water monitoring, as well as other technical materials; and Battlement Mesa Metropolitan District for their assistance in understanding the water sources for the community. Appendix D page 3
Appendix D Screening Level Human Health Risk Assessment February 2011 Battlement Mesa, Colorado Health Impact Assessment Colorado School of Public Health TABLE OF CONTENTS Summary of Modifications: .............................................................................................. 11 1 Introduction ................................................................................................................. 1 1.1 Site Description ................................................................................................... 2 1.1.1 Geology .............................................................................................................. 3 1.1.2 Population .......................................................................................................... 3 1.1.3 Economy ........................................................................................................... 4 1.1.4 Antero’s Proposed Plan............................................................................... 4 1.2 Previous Risk Assessments ................................................................................. 4 1.2.1 2002 Community-based Short-term Ambient Air Screening Study in Garfield County for Oil and Gas Related Activities (CDPHE 2002) ....................................... 5 1.2.2 2005-2007 Garfield County Air Toxics Inhalation: Screening Level Human Health Risk Assessment (CDPHE 2007) .................................................................... 5 1.2.3 2008 Community Health Risk Analysis of Oil and Gas Industry Impacts in Garfield County, Colorado (Coons and Walker, 2008) ............................................. 6 1.2.4 2010 Garfield County Air Toxics Inhalation: Screening Level Human Health Risk Assessment Inhalation of Volatile Organic Compounds Measured in 2008 Air Quality Monitoring Study (CDPHE 2010). ................................................................ 7 2 Data Evaluation and Selection of COPCs ................................................................. 10 2.1 Sources of data .................................................................................................. 10 2.1.1 2005 to 2007 Garfield County Ambient Air Quality Study ............................ 10 2.1.2 2008 Garfield County Air Toxics Study ......................................................... 10 2.1.3 2008 to 2010 Garfield County Ambient Air Study ......................................... 11 2.1.4 2010 Antero Sampling .................................................................................... 11 2.1.5 2010 annual groundwater quality results – Battlement Mesa Water treatment plant........................................................................................................................... 12 2.2 Sample Quantitation Limit Evaluation ............................................................. 12 2.2.1 2005 to 2007 VOC data ................................................................................. 12 2.2.2 2008 to 2010 data ........................................................................................... 13 2.2.3 Groundwater data ............................................................................................ 13 2.3 Data Reduction, Summary Statistics................................................................. 13 2.3.1 Duplicate Analyses ......................................................................................... 13 2.3.2 Summary Statistics of Sample Data ................................................................ 14 2.4 Background ....................................................................................................... 14 2.5 Selection of Contaminants of Potential Concern and Exposure Point Concentrations .............................................................................................................. 15 2.5.1 Chemicals of Potential Concern Battlement Mesa Baseline Risk .................. 15 2.5.2 Bell-Melton Ranch Monitoring Station .......................................................... 16 2.5.3 Contaminants of Potential Concern Well Completion .................................... 16 2.5.4 Chemicals of Potential Concern Grab Samples .............................................. 17 2.6 Statistical Observations for Select COPCs ....................................................... 18 2.6.1 Comparison Between Ambient Air Samples and Well Completion Samples 18 2.6.2 Observed Temporal Trends............................................................................. 19 3 Exposure Assessment................................................................................................ 20 3.1 Potentially Exposed Populations....................................................................... 20 Appendix D page 4
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1 of 2 Table 2-1 Comparison of MRLs
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Table 2-2 Comparison of MRLs from 2
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Table 2-3 Comparison of MRLs for 20
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Chemical Number of samples Table 2-
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Table 2-4 Summary Statistics and Se
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Number of Samples Table 2-7 Summary
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Table 2-8 Ambient Air Summary Stati
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Table 2-8 Ambient Air Summary Stati
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Chemical Table 2-9 95% UCLs and Sel
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2010) 4 of 4 Table 2-9 95% UCLs and
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Chemical Table 2-10 95% UCLs and Se
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Chemical Table 2-11 95% UCLs and Se
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Statistic Table 2-12 Comparison of
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Table 3-1 Cancer and Non-Cancer Air
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Table 3-2 Cancer and Non-Cancer Air
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Table 3-3 EPCs and Surface Water In
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Table 4-1 Cancer and Non-Cancer Inh
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4 of 4 Table 4-1 Cancer and Non-Can
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Chemical Available Toxicity Values
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Table 5-1 Baseline Risk Characteriz
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Table 5-2 Comparison of EPCs to BTV
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1 of 2 Table 5-4 Chronic Risk Chara
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1 of 1 Table 5-5 Subchronic Risk Ch
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Table 5-7 Acute Risk Characterizati
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Table 6-1 Chemicals Identified from
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Benzene, Ethylbenzene, and d m&p-Xy
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Sources Potential Releases Exposure
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Excess Canc cer Risk per one Millio
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