Site Specific Conditional Sampler Garfield County, Colorado. VOC Data Summaries. Prepared for

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Site Specific Conditional Sampler Garfield County, Colorado VOC Data Summaries Prepared for Garfield County Public Health 195 West 14 th Street Rifle, Colorado 81650 Prepared by 1901 Sharp Point Dr., Suite F Fort Collins, CO 80525 970-484-7941 www.air-resource.com February 26, 2017

TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1-1 2.0 SAMPLE COLLECTION AND ANALYSIS 2-1 3.0 OPERATIONAL SUMMARY 3-1 4.0 DATA SUMMARIES 4-1 APPENDIX A Lab Results A-1 LIST OF FIGURES Figure Page 1-1 Map showing location of the general sampling area 1-2 1-2 Photo of upwind conditional sampler system 1-3 1-3 Photo of downwind conditional sampler system 1-3 1-4 Photo of example canister 1-4 4-1 Measured SNMOC Concentrations 4-2 4-2 Meteorological Time Series Plot October 2017 4-3 4-3 Meteorological Time Series Plot November 2017 4-4 4-4 Meteorological Time Series Plot Upwind Sampler December 2017 4-5 4-5 Meteorological Time Series Plot Downwind Sampler December 2017 4-6 4-6 Wind Rose October 2017 4-7 4-7 Wind Rose November 2017 4-8 4-8 Wind Rose Upwind Sampler December 2017 (partial) 4-9 4-9 Wind Rose Downwind Sampler December 2017 (partial) 4-10 LIST OF TABLES Table Page 3-1 Operational Summary 3-1 i

1.0 INTRODUCTION In response to citizen concerns, Garfield County Public Health contracted with Air Resource Specialists, Inc. (ARS) to design and build a conditional sampler to collect canister samples near a newly developed well-pad operated by URSA Operating Company, LLC. Figure 1-1 presents a map showing the general location of URSA operations and the monitoring location. Figures 1-2 and 1-3 show photographs of the sampling systems. This data submittal report summarizes Speciated Non-Methane Organic Compounds (SNMOC) measured at the URSA site. Any questions regarding the content of this report or the accompanying digital data files should be addressed to: Morgan Hill Environmental Health Specialist III mhill@garfield-county.com or Anna Triebel atriebel@garfield-county.com Garfield County Public Health - Rifle. 195 West 14th Street Rifle, CO 81650 970-625-5200 phone 970-625-4804 fax Garfield County Public Health - Glenwood Springs 2014 Blake Avenue Glenwood Springs, CO 81601 970-945-6614 phone 970-947-0155 fax 1-1

Figure 1-1. Map Showing General Location of the Sampling Area. 1-2

Figure 1-2. Upwind Conditional Sampler Figure 1-3. Downwind Conditional Sampler 1-3

Figure 1-4. Example Summa Canister 1-4

2.0 SAMPLE COLLECTION AND ANALYSIS Methodologies for the collection and analysis of Volatile Organic Compounds (VOC) at the URSA site specific conditional monitoring site meet EPA s Compendium of Methods for Determination of Toxic Organic Compounds in Ambient Air. Speciated compounds are analyzed from samples collected using a SUMMA stainless steel canister following EPA s Compendium Method TO-12, Determination of Non-Methane Organic Compounds (NMOC) in Ambient Air Using Cryogenic Preconcentration and Direct Flame Ionization Detection (PDFID). Collected samples are sent to Eastern Research Group, Inc. (ERG) for analysis. During the October and November samples, the two-canister conditional sampler collected ambient air samples when specific wind direction conditions were present. To collect samples influenced by well pad activities, the sampler valves opened on the downwind when prevailing winds came from the north (between 350 and 10 ). When the prevailing winds were from the south (between 170 and 190 ), the sampler valves opened on the upwind canister, separate from the downwind canister, to collect data not likely to be associated with well pad activities. A leak in the upwind canister portion of the system was discovered during the November sampling event, invalidating the upwind sample. On November 29, 2017, ARS visited the site to remove the sampling system for repair and reconfiguration. Two grab samples were collected in November, and one grab sample was collected in December. Following servicing and repairs, the original system was modified to utilize only one canister and reinstalled with an additional, identical, sampling system on the other side of the well pad. Beginning in First quarter 2018, each system will collect ambient air samples during periods of sufficient wind speed. The samplers operate when prevailing winds are from the southwest (215-235 ), collecting upwind samples not likely associated with activities from the well pad using one system, and collecting downwind samples likely to be influenced by well pad activity using the other system. For this study, each sample comprises at least a seven day period to ensure sufficient collection for VOC identification. Following exposure, samples were collected by Garfield County Public Health site operators and shipped directly to ERG for analysis. Chain-of-custody accounting is fully documented by shipping records, shipping logs, and field sampling log sheets, maintained by Garfield County Public Health. ERG performs sample analysis and data validation for samples per EPA method TO-12 requirements and provides validated data to ARS for inclusion in reports, data submittals and archives. 2-1

3.0 OPERATIONAL SUMMARY The operational timelines for the canister samples for the reporting period are summarized in Table 3-1. The summaries include sampling times, site visits and significant events affecting data collection. Table 3-1 Sampler Operational Timeline October December 2017 Month/Year Upwind Canister Total Sampling Time Downwind Canister Total Sampling Time October 2017 491 minutes 493 minutes November 2017 invalid 441 minutes November 2017 B-pad grab sample (11/21/2017) River Bluff Road Grab Sample #1 (11/28/2017) December 2017 River Bluff Road Grab Sample #2 (12/19/2017) 3-1

4.0 DATA SUMMARIES Volatile organic compounds (VOCs) are carbon-based and hydrogen-based chemicals that exist in the gas phase or can evaporate from liquids. VOCs can react in the atmosphere to form ozone (O 3 ) and particulate matter. Hazardous air pollutants (HAPs) are a subset of VOC compounds, and include compounds that are known or believed to cause human health effects. Speciated Non-Methane Organic Compounds (SNMOC) are collected and analyzed according to EPA Compendium Method TO-12. Figure 4-1 presents measured SNMOC compounds collected from the site specific conditional sampler during each week long sampling event. Associated meteorological data are presented in Figures 4-2 through 4-5 as timeline series plots. Figures 4-6 through 4-9 present monthly wind roses associated with each conditional sampling period. 4-1

Figure 4-1. Measured SNMOC Concentrations Site Specific Conditional Sampler 4-2

Figure 4-2 Garfield County - Site Specific Sampler - Meteorological Data October 2017 100 75 SDWD 50 25 0 360 270 VWD (deg) 180 90 0 16 12 SWS (m/s) 8 4 0 50 30 TMP (degc) 10-10 -30 Date 10/01 10/02 10/03 10/04 10/05 10/06 10/07 10/08 10/09 10/10 10/11 10/12 10/13 10/14 10/15 10/16 10/17 10/18 10/19 10/20 10/21 10/22 10/23 10/24 10/25 10/26 10/27 10/28 10/29 10/30 10/31 4-3

Figure 4-3 Garfield County - Site Specific Sampler - Meteorological Data November 2017 100 75 SDWD 50 25 0 360 270 VWD (deg) 180 90 0 16 12 SWS (m/s) 8 4 0 50 30 TMP (degc) 10-10 -30 Date 11/01 11/02 11/03 11/04 11/05 11/06 11/07 11/08 11/09 11/10 11/11 11/12 11/13 11/14 11/15 11/16 11/17 11/18 11/19 11/20 11/21 11/22 11/23 11/24 11/25 11/26 11/27 11/28 11/29 11/30 4-4

Figure 4-4 Upwind Sampler Garfield County - Meteorological Data December 2017 100 75 SDWD 50 25 0 360 270 VWD (deg) 180 90 0 16 12 SWS (m/s) 8 4 0 50 30 TMP (degc) 10-10 -30 Date 12/01 12/02 12/03 12/04 12/05 12/06 12/07 12/08 12/09 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 4-5

Figure 4-5 Downwind Sampler Garfield County - Meteorological Data December 2017 100 75 SDWD 50 25 0 360 270 VWD (deg) 180 90 0 16 12 SWS (m/s) 8 4 0 50 30 TMP (degc) 10-10 -30 Date 12/01 12/02 12/03 12/04 12/05 12/06 12/07 12/08 12/09 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 4-6

Garfiled County Colorado Site Specific Sampler Figure 4-6 Wind Rose 10/01/2017-10/31/2017 0 NNW N NNE 315 NW 45 NE 40% WNW 20% ENE 270 W Calm 0.13% E 90 WSW ESE SW 225 SE 135 SSW 100.0% Collected 100.0% Valid 744 Possible /744 Collected /744 Valid Collection Statistics Include: Wind Speed and Wind Direction (SWS-1; VWD-1) S 180 SSE Key Scalar Wind Speed (m/s) Calm < 0.5 0.5-0.9 1.0-3.9 4.0-6.9 7.0-9.9 10.0-12.9 13.0-15.9 16.0-18.9 19.0+ 4-7

Garfiled County Colorado Site Specific Sampler Figure 4-7 Wind Rose 11/01/2017-11/30/2017 0 NNW N NNE 315 NW 45 NE 40% WNW 20% ENE 270 W Calm 1.56% E 90 WSW ESE SW 225 SE 135 SSW 84.5% Collected 84.5% Valid 684 Possible /578 Collected /578 Valid Collection Statistics Include: Wind Speed and Wind Direction (SWS-1; VWD-1) S 180 SSE Key Scalar Wind Speed (m/s) Calm < 0.5 0.5-0.9 1.0-3.9 4.0-6.9 7.0-9.9 10.0-12.9 13.0-15.9 16.0-18.9 19.0+ 4-8

Garfield County Colorado Upwind Sampler NNW Figure 4-8 Wind Rose 0 N 12/01/2017-12/31/2017 (partial) NNE 315 NW 45 NE 40% WNW 20% ENE 270 W Calm 7.69% E 90 WSW ESE SW 225 SE 135 SSW 98.9% Collected 98.9% Valid 276 Possible /273 Collected /273 Valid Collection Statistics Include: Wind Speed and Wind Direction (SWS-1; VWD-1) S 180 SSE Key Scalar Wind Speed (m/s) Calm < 0.5 0.5-0.9 1.0-3.9 4.0-6.9 7.0-9.9 10.0-12.9 13.0-15.9 16.0-18.9 19.0+ 4-9

Garfiled County Colorado Downwind Sampler NNW Figure 4-9 Wind Rose 0 N 12/01/2017-12/31/2017 (partial) NNE 315 NW 45 NE 40% WNW 20% ENE 270 W Calm 12.68% E 90 WSW ESE SW 225 SE 135 SSW 100.0% Collected 100.0% Valid 276 Possible /276 Collected /276 Valid Collection Statistics Include: Wind Speed and Wind Direction (SWS-1; VWD-1) S 180 SSE Key Scalar Wind Speed (m/s) Calm < 0.5 0.5-0.9 1.0-3.9 4.0-6.9 7.0-9.9 10.0-12.9 13.0-15.9 16.0-18.9 19.0+ 4-10

Appendix A URSA Pad Site Specific Conditional Sampler Garfield County, Colorado Speciated VOC Concentrations A-1

Garfield County - URSA Pad Site Specific Conditional Sampler October 2017 Upwind Canister Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene ND U 1,2,4-Trimethylbenzene 0.68100 1,3,5-Trimethylbenzene 0.37800 1,3-Butadiene ND U 1-Butene ND CE, U 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene 0.06600 U 1-Nonene 0.16100 1-Octene 0.39500 1-Pentene 0.12400 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 0.39800 2,3,4-Trimethylpentane ND U 2,3-Dimethylbutane 0.63400 2,3-Dimethylpentane 0.46100 2,4-Dimethylpentane 0.30500 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND CE, U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND CE, U 2-Methylheptane 0.93000 2-Methylhexane 1.68000 2-Methylpentane 2.55000 3-Methyl-1-butene ND U 3-Methylheptane 0.82800 3-Methylhexane 1.40000 3-Methylpentane 1.48000 4-Methyl-1-pentene ND U Acetylene 0.70200 a-pinene 0.17300 U Benzene 2.04000 b-pinene ND U cis-2-butene ND U cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 3.00000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler October 2017 Upwind Canister Detected Compound Concentration (ppbv) Comments Cyclopentane 0.31000 Cyclopentene ND U Ethane 56.30000 Ethylbenzene 0.82400 Ethylene 1.79000 Isobutane 8.14000 Isobutylene ND CE, U Isopentane ND CE, U Isoprene 0.08700 Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 6.93000 Methylcyclopentane 2.25000 m-ethyltoluene 0.50900 m-xylene/p-xylene 2.03000 n-butane 8.36000 n-decane 0.81700 n-dodecane 0.33500 n-heptane 2.51000 n-hexane 3.26000 n-nonane 1.26000 n-octane 2.60000 n-pentane 3.96000 n-propylbenzene ND U n-tridecane ND U n-undecane 0.42300 o-ethyltoluene ND U o-xylene 1.01000 p-diethylbenzene ND U p-ethyltoluene ND U Propane 25.30000 Propylene 0.78700 Propyne ND U Styrene ND CE, U Toluene 13.20000 trans-2-butene ND U trans-2-hexene ND U trans-2-pentene 0.04800 U CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler October 2017 Downwind Canister Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene ND U 1,2,4-Trimethylbenzene 0.70300 1,3,5-Trimethylbenzene 0.42000 1,3-Butadiene 0.11000 1-Butene ND U, CE 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene 0.16400 1-Nonene 0.26600 1-Octene 0.52600 1-Pentene 0.25700 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 0.47500 2,3,4-Trimethylpentane ND U 2,3-Dimethylbutane 0.71300 2,3-Dimethylpentane 0.52500 2,4-Dimethylpentane 0.38300 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND CE, U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND CE, U 2-Methylheptane 1.09000 2-Methylhexane 1.99000 2-Methylpentane 3.32000 3-Methyl-1-butene ND U 3-Methylheptane 0.87600 3-Methylhexane 1.64000 3-Methylpentane 1.75000 4-Methyl-1-pentene ND U Acetylene 1.07000 a-pinene ND U Benzene 2.24000 b-pinene ND U cis-2-butene 0.05300 cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 3.26000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler October 2017 Downwind Canister Detected Compound Concentration (ppbv) Comments Cyclopentane 0.34100 Cyclopentene ND U Ethane 63.00000 Ethylbenzene 0.89100 Ethylene 2.90000 Isobutane 9.42000 Isobutylene ND CE, U Isopentane ND CE, U Isoprene 0.09600 Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 7.70000 Methylcyclopentane 2.51000 m-ethyltoluene 0.65000 m-xylene/p-xylene 2.32000 n-butane 9.54000 n-decane 0.93200 n-dodecane 0.21800 U n-heptane 2.78000 n-hexane 3.71000 n-nonane 1.42000 n-octane 2.90000 n-pentane 4.66000 n-propylbenzene ND U n-tridecane ND U n-undecane 0.39800 o-ethyltoluene 0.19800 U o-xylene 1.10000 p-diethylbenzene ND U p-ethyltoluene ND U Propane 29.30000 Propylene 1.21000 Propyne ND U Styrene ND CE, U Toluene 8.06000 trans-2-butene 0.44700 trans-2-hexene ND U trans-2-pentene 0.10700 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 21, 2017 B-pad Grab Sample Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene ND U 1,2,4-Trimethylbenzene 0.55700 1,3,5-Trimethylbenzene 0.34900 1,3-Butadiene 0.13700 1-Butene ND CE, U 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene ND U 1-Nonene ND U 1-Octene 0.28000 1-Pentene 0.13700 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 0.68900 2,3,4-Trimethylpentane ND U 2,3-Dimethylbutane 1.17000 2,3-Dimethylpentane 0.65400 2,4-Dimethylpentane 0.47200 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND CE, U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND CE, U 2-Methylheptane 0.89100 2-Methylhexane 1.94000 2-Methylpentane 4.60000 3-Methyl-1-butene ND U 3-Methylheptane 0.64600 3-Methylhexane 1.71000 3-Methylpentane 2.54000 4-Methyl-1-pentene ND U Acetylene 1.70000 a-pinene ND U Benzene 2.46000 b-pinene ND U cis-2-butene 0.09200 cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 4.52000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 21, 2017 B-pad Grab Sample Detected Compound Concentration (ppbv) Comments Cyclopentane 0.60900 Cyclopentene ND U Ethane 128.00000 Ethylbenzene 0.84800 Ethylene 3.86000 Isobutane 22.80000 Isobutylene ND CE, U Isopentane 16.70000 Isoprene ND U Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 8.20000 Methylcyclopentane 3.56000 m-ethyltoluene 0.28300 U m-xylene/p-xylene 1.74000 n-butane 23.50000 n-decane 0.52000 n-dodecane ND U n-heptane 3.06000 n-hexane 5.71000 n-nonane 0.78800 n-octane 2.16000 n-pentane 9.32000 n-propylbenzene ND U n-tridecane ND U n-undecane ND U o-ethyltoluene 0.15600 U o-xylene 1.06000 p-diethylbenzene ND U p-ethyltoluene ND U Propane 67.20000 Propylene 1.24000 Propyne ND U Styrene ND CE, U Toluene 4.06000 trans-2-butene 0.11600 trans-2-hexene ND U trans-2-pentene ND U CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 28, 2017 River Bluff Road Grab Sample 1 Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene 0.96800 1,2,4-Trimethylbenzene 5.50000 1,3,5-Trimethylbenzene 6.17000 1,3-Butadiene 0.40500 1-Butene ND CE, U 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene 0.07000 U 1-Nonene 1.42000 1-Octene 3.16000 1-Pentene 0.15000 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 1.11000 2,3,4-Trimethylpentane 0.08400 U 2,3-Dimethylbutane 2.63000 2,3-Dimethylpentane 3.07000 2,4-Dimethylpentane 1.88000 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND U 2-Methylheptane 13.10000 2-Methylhexane 9.71000 2-Methylpentane 9.71000 3-Methyl-1-butene ND U 3-Methylheptane 9.92000 3-Methylhexane 9.48000 3-Methylpentane 6.25000 4-Methyl-1-pentene ND U Acetylene 1.14000 a-pinene ND U Benzene 10.00000 b-pinene ND U cis-2-butene ND U cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 19.90000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 28, 2017 River Bluff Road Grab Sample 1 Detected Compound Concentration (ppbv) Comments Cyclopentane 1.26000 Cyclopentene ND CE, U Ethane 66.20000 Ethylbenzene 2.93000 Ethylene 3.68000 Isobutane 10.70000 Isobutylene ND CE, U Isopentane 14.50000 Isoprene 0.08200 Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 69.00000 Methylcyclopentane 12.10000 m-ethyltoluene 3.12000 m-xylene/p-xylene 31.80000 n-butane 14.20000 n-decane 14.70000 n-dodecane 1.22000 n-heptane 23.30000 n-hexane 16.60000 n-nonane 26.00000 n-octane 38.90000 n-pentane 11.80000 n-propylbenzene 0.82600 n-tridecane 0.25400 U n-undecane 4.55000 o-ethyltoluene 2.81000 o-xylene 5.40000 p-diethylbenzene ND U p-ethyltoluene 2.83000 Propane 29.50000 Propylene 1.42000 Propyne ND U Styrene ND U Toluene 29.80000 trans-2-butene ND U trans-2-hexene ND U trans-2-pentene ND U CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 2017 Downwind Canister Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene ND U 1,2,4-Trimethylbenzene 1.26000 1,3,5-Trimethylbenzene 0.29400 1,3-Butadiene ND U 1-Butene ND CE, U 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene 0.10300 1-Nonene 0.13100 1-Octene 0.41900 1-Pentene 0.20100 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 0.50200 2,3,4-Trimethylpentane ND U 2,3-Dimethylbutane 0.81300 2,3-Dimethylpentane 0.54200 2,4-Dimethylpentane 0.39000 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND CE, U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND CE, U 2-Methylheptane 1.12000 2-Methylhexane ND CE, U 2-Methylpentane 3.40000 3-Methyl-1-butene ND U 3-Methylheptane 0.89300 3-Methylhexane 1.65000 3-Methylpentane 1.91000 4-Methyl-1-pentene ND U Acetylene 1.01000 a-pinene ND U Benzene 2.10000 A-01 b-pinene ND U cis-2-butene 0.04900 U cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 3.87000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler November 2017 Downwind Canister Detected Compound Concentration (ppbv) Comments Cyclopentane 0.41100 Cyclopentene ND U Ethane 73.00000 Ethylbenzene 0.98700 Ethylene 2.57000 Isobutane 11.50000 Isobutylene ND CE, U Isopentane ND CE, U Isoprene ND U Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 8.48000 Methylcyclopentane 2.72000 m-ethyltoluene ND U m-xylene/p-xylene 2.19000 n-butane 12.20000 n-decane 0.76900 n-dodecane 0.57800 n-heptane 3.15000 n-hexane 4.35000 n-nonane 1.40000 n-octane 3.08000 n-pentane 5.48000 n-propylbenzene 0.28400 n-tridecane ND U n-undecane 0.51000 o-ethyltoluene ND U o-xylene 1.12000 p-diethylbenzene ND U p-ethyltoluene ND U Propane 35.30000 Propylene 1.34000 Propyne 0.04600 Styrene ND CE, U Toluene 10.20000 trans-2-butene 0.06200 U trans-2-hexene ND U trans-2-pentene 0.05700 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler December 19, 2017 River Bluff Road Grab Sample 2 Detected Compound Concentration (ppbv) Comments 1,2,3-Trimethylbenzene 0.19500 U 1,2,4-Trimethylbenzene 1.38000 1,3,5-Trimethylbenzene 1.52000 1,3-Butadiene ND U 1-Butene ND CE, U 1-Decene ND U 1-Dodecene ND U 1-Heptene ND U 1-Hexene ND U 1-Nonene 0.48300 1-Octene ND U 1-Pentene 0.06600 1-Tridecene ND U 1-Undecene ND U 2,2,3-Trimethylpentane ND U 2,2,4-Trimethylpentane ND U 2,2-Dimethylbutane 1.10000 2,3,4-Trimethylpentane ND U 2,3-Dimethylbutane 2.35000 2,3-Dimethylpentane 2.04000 2,4-Dimethylpentane 1.34000 2-Ethyl-1-butene ND U 2-Methyl-1-butene ND U 2-Methyl-1-pentene ND U 2-Methyl-2-butene ND U 2-Methylheptane 6.60000 2-Methylhexane 6.84000 2-Methylpentane 8.47000 3-Methyl-1-butene ND U 3-Methylheptane 5.09000 3-Methylhexane 6.49000 3-Methylpentane 5.37000 4-Methyl-1-pentene ND U Acetylene 0.84800 a-pinene ND U Benzene 4.95000 b-pinene ND U cis-2-butene ND U cis-2-hexene ND U cis-2-pentene ND U Cyclohexane 14.10000 CE = Not reportable due to co-eluting compound U = Under detection limit

Garfield County - URSA Pad Site Specific Conditional Sampler December 19, 2017 River Bluff Road Grab Sample 2 Detected Compound Concentration (ppbv) Comments Cyclopentane 1.11000 Cyclopentene ND U Ethane 120.00000 Ethylbenzene 0.99200 Ethylene 3.14000 Isobutane 17.60000 Isobutylene ND CE, U Isopentane 16.10000 Isoprene ND U Isopropylbenzene ND U m-diethylbenzene ND U Methylcyclohexane 40.00000 Methylcyclopentane 9.37000 m-ethyltoluene 0.87600 m-xylene/p-xylene 11.20000 n-butane 19.60000 n-decane 3.37000 n-dodecane 0.23600 U n-heptane 15.40000 n-hexane 14.10000 n-nonane 8.06000 n-octane 18.10000 n-pentane 12.00000 n-propylbenzene 0.25900 n-tridecane ND U n-undecane 0.87900 o-ethyltoluene 0.74100 o-xylene 1.62000 p-diethylbenzene ND U p-ethyltoluene 0.79800 Propane 56.00000 Propylene 0.31500 Propyne ND U Styrene ND U Toluene 13.60000 trans-2-butene ND U trans-2-hexene ND U trans-2-pentene ND U CE = Not reportable due to co-eluting compound U = Under detection limit

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