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 LIST OF TABLES Table 2-1: Comparison of MRLs for 2005-2007 Data to EPA RSLs Table 2-2: Comparison of MRLs from 2008 to 2010 Data to EPA RSLs Table 2-3: Comparison of MRLs for Groundwater Data Table 2-4: Summary Statistics and Selection of COPCs by Comparison to EPA RSLs September to November 2010 Ambient Air Data Collected from Battlement Mesa Table 2-5: Summary Statistics and Selection of COPCs by Comparison to EPA RSLs 2005 -2010 Ambient Air Data Bell-Melton Ranch Monitoring Station Table 2-6: Summary Statistics and Selection of COPCs by Comparison to EPA Well Completion Operations 2008, 2010 Table 2-7: Summary Statistics and Selection of COPCs by Comparison to EPA RSLs Odor Events 2005 to 2007, 2010 Grab Samples Table 2-8: Ambient Air Summary Statistics for Background Samples 2005 to 2008 Table 2-9: 95% UCLs and Selection of EPCs September to November 2010 Battlement Mesa Monitoring Station Table 2-10: 95% UCLs and Selection of EPCs for Bell-Melton Ranch Monitoring Station 2005 to 2010 Table 2-11: 95% UCLs and Selection of EPCs for Well Completion 2008 and 2010 Table 2-12: Comparison of Means between Well Completion Samples and Bell-Melton Ranch Samples Table 3-1: Cancer and Non-cancer Air Intake Values for Battlement Mesa Baseline Risk Table 3-2: Cancer and Non-cancer Air Intake Values for Chronic and Subchronic Exposures Bell-Melton Ranch Table 3-3: EPCs and Surface Water Intakes for Acute Exposure of Child Resident Table 4-1: Cancer and Non-cancer Inhalation Toxicity Values Table 4-2: Contaminants of Potential Concern without Toxicity Values Table 4-3: Oral/Dermal Non-cancer Toxicity Factors Appendix D page 7
Appendix D Screening Level Human Health Risk Assessment February 2011 Battlement Mesa, Colorado Health Impact Assessment Colorado School of Public Health Table 4-4: Target Organ/Systems for Non-cancer COPCs Table 5-1: Baseline Risk Characterization for all Battlement Mesa Residents Table 5-2: Comparison of EPCs to BTVs Table 5-3: Chronic Risk Characterization for All Battlement Mesa Residents – 30 year Duration Table 5-4: Chronic Risk Characterization for Residents Living Near a Well Pad – 30 year Duration Table 5-5: Subchronic Risk Characterization for All Residents Near a Well Pad – 20 month Duration Table 5-6: Acute Risk Characterization for Child Resident Living Near a Well Pad – 7day Duration Table 5-7: Acute Risk Characterization for Adult and Elderly Resident Living Near a Well Pad – 7-day Duration Table 6-1: Chemicals Identified from Antero’s MSDS Table 7-1: Summary of Risk Characterization LIST OF FIGURES Figure 2-1: Temporal Trends of BTEX at Bell-Melton Ranch Monitoring Station – 2005 to 2010 Figure 2-2: Temporal Trends for Carbonyls Bell Melton Ranch Monitoring Station – 2008 to 2010 Figure 3-1: Conceptual Site Model for Battlement Mesa Health Impact Assessment Figure 3-2: Domestic water supply and proposed well pad locations. Figure 3-3: Locations of Baseline and Bell-Melton Ranch Monitoring Stations Figure 7-1: Summary of Non-cancer Health Hazards Figure 7-2: Summary of Excess Lifetime Cancer Risk Appendix D page 8
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Appendix D Screening Level Human He
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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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