GREG LACKEY, PH.D /2 Broadway Street Boulder, CO, (724) greglackey.org

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1 GREG LACKEY, PH.D /2 Broadway Street Boulder, CO, (724) greglackey.org EDUCATION University of Colorado, Boulder August, 2017 Ph.D., Civil Engineering Dissertation Title: Understanding the incidence and consequences of oil and gas well integrity loss in Colorado through public data analysis and numerical modeling. Advisor: Harihar Rajaram University of Colorado, Boulder July, 2013 M.S., Civil Engineering Thesis Title: The effects of stream channel conductance on stream depletion. Advisor: Roseanna Neupauer The Pennsylvania State University May, 2011 B.S., Environmental Systems Engineering, magna cum laude Engineer in Training, Pennsylvania May, 2011 PROFESSIONAL EXPERIENCE Postdoctoral Research Fellow University of Colorado, Boulder August, Current Boulder, CO I use a combination of data science and numerical modeling techniques to electronically gather dispersed online data and provide the framework for contaminant flow and transport models. I am currently investigating the transport mechanisms of stray gas away from faulty wells and into shallow aquifers. To further understand this issue, I am building a model that comprehensively simulates stray gas migration away from a faulty well. My model captures the multiphase flow of methane along the wellbore and the subsequent formation of a methane plume in the subsurface. We are coupling PFLOTRAN with SCPMOD, a model I previously developed, to perform the simulations. Graduate Research Assistant (Ph.D.) August, August, 2017 University of Colorado, Boulder Boulder, CO My dissertation research focused on understanding relationship between oil and gas well integrity loss and stray gas migration in Colorado. Faulty oil and gas wells with compromised integrity allow for the vertical migration of hydrocarbons and typically exhibit an undesirable pressure at the wellhead (SCP). I used the computer language Python to download and gather data from 100,000 well integrity test records from an online oil and gas database. I investigated trends in oil and gas well integrity loss using various statistical methods and identified the wells in the state that pose the greatest risk of contaminating groundwater. To better understand the SCP data we gathered, I derived and programmed a model (SCPMOD) of methane leakage along a wellbore in Fortran SCPMOD accurately accounts for the physics of multiphase flow through common onshore well construction configurations and shows how different well construction practices influence stray gas migration. SCPMOD can also be used to calculate effective cement permeabilities and methane leakage rates in faulty wells. 1

2 Graduate Research Assistant (M.S.) May, July, 2013 University of Colorado, Boulder Boulder, CO For my M.S. thesis I designed and ran groundwater flow simulations using MODFLOW-2000 to demonstrate that natural spatial and temporal variations in stream channel conductance significantly influence estimations of stream depletion. Chevron Mining Inc. Summer, 2010 Environmental Engineering Intern Questa, NM I was responsible for a storm water runoff project related to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and I also performed regulatory surface and subsurface water quality sampling. Wallace and Pancher Inc. Summer, 2009 Environmental Engineering Intern Hermitage, PA I collected and analyzed benthic macroinvertebrate field samples in an environmental laboratory and became proficient with state regulations for freshwater macroinvertebrate sampling. PEER-REVIEWED PUBLICATIONS Journal Publications [1] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan Surface casing pressure as an indicator of well integrity loss and stray gas migration in the Wattenberg Field, Colorado. Environmental Science & Technology. Vol. 51, no. 6: [2] Sherwood, OA, JD Rogers, G Lackey, TL Burke, SG Osborn and JN Ryan Groundwater methane in relation to oil and gas development and shallow coal seams in the Denver-Julesburg Basin of Colorado. Proceedings of the National Academy of Sciences of the United States of America. Vol. 113, no. 30: [3] Birdsell, DT, H Rajaram and G Lackey Imbibition of hydraulic fracturing fluids into partially saturated shale. Water Resources Research. Vol. 51, no. 8: [4] Lackey, G, RM Neupauer and J Pitlick Effects of streambed conductance on stream depletion. Water. Vol. 7: Conference Proceedings [1] Lackey, G, H Rajaram, S Karra and HS Viswanathan. Modeling Stray Gas Leakage from Wellbores in Colorado Shale Gas Operations. American Rock Mechanics Association, 49th US Rock Mechanics / Geomechanics Symposium. San Francisco, CA, July [2] Lackey, G, RM Neupauer and J Pitlick. Effects of varying stream channel conductance on siting new pumping wells in an aquifer. World Environmental and Water Resources Congress, American Society of Civil Engineers, Cincinnati, OH, May In Review [1] Rice, A, G Lackey, J Proctor and K Singha. Groundwater quality hazards of methane leakage from hydrocarbon wells: A review of observational and numerical studies and four testable hypotheses. WIREs Water, In-Review. 2

3 In Preparation 1. RM Neupauer, G Lackey and J Pitlick. Effects of spatio-temporal variability of streambed hydraulic conductivity on stream depletion. Groundwater. Results are completed and the manuscript is nearly in its final form. 2. Lackey, G and H Rajaram. Modeling the buildup of annular pressure in cased and uncased faulty wellbores. International Journal of Greenhouse Gas Control. Results are completed and we are currently revising the manuscript. [3] Lackey, G, H Rajaram, OA Sherwood, D Chauhan and JN Ryan. Oil and gas well integrity in Colorado. Environmental Science & Technology. Results are completed and we are discussing the vision of the manuscript. TEACHING, MENTORING & OUTREACH EXPERIENCE Teaching Assistant CVEN 3414 Fundamentals of Environmental Engineering; Taught weekly review sessions for a 60 student course and gave bi-weekly lectures on relevant environmental engineering issues. EVEN Water Chemistry and Water Chemistry Lab; Prepared and managed 6 bi-weekly water chemistry laboratory sessions with 10 students each. Graded laboratory reports and provided feedback on technical writing to both graduate and undergraduate students. Taught weekly homework review sessions for the 60 student lecture portion of the course. SSIR 1010 Social Entrepreneurship & Sustainability; Assisted teaching a total of 4 sessions of the course with 30 students each over a two year period. Led classroom discussions, graded homeworks, and provided office hours. Worked with a team of 5 faculty members to improve the course curriculum between my first and second year of assisting the course. GEEN 1410 First Year Engineering Projects; Served as a TA for a total of 4 sessions of the course with 25 students each over a two year period. Aided in the development of, and technically advised, engineering projects. Worked with students to develop their communication and presentation skills. EGG 211 Engineering Mechanics I - Engineering Statics; Graded homework and held weekly office hours for a 100 student course. CVEN 4353 Groundwater Hydrology; Graded homework and provided feedback for a 40 student class. Student Mentoring Mark Schroeder, M.S. student. Co-advised spring present. The goal of this project is to review groundwater sampling records from the Colorado Oil and Gas Conservation Commission to assess the frequency of BTEX contamination on the Colorado Front Range. I am helping Mr. Schroeder develop skills in data analysis and the Python computer language. We also meet to interpret results and discuss the vision of the manuscript. John Stults, M.S. student.co-advised spring present. Mr. Stults is analyzing records from the FracFocus online chemical usage database to determine the usage of organic compounds of concern in hydraulic fracturing operations across the United States. We collaborated to electronically mine the data used in this project from hundreds of thousands of PDFs obtained from FracFocus. I have also helped Mr. Stults interpret results and formulate the vision for a manuscript. Richard Fisher, M.S. student. Co-advised summer present. Mr. Fisher is using the multiphase porous media and transport code PFLOTRAN to simulate the transport of methane and benzene away from a faulty well in western Colorado. I am helping Mr. Fisher couple a model I previously developed with PFLOTRAN and formulate the vision for a manuscript. 3

4 Devansh Chauhan, B.S. student. Co-advised spring present. I helped Mr. Chauhan develop skills with the Python computer language and guided him through compiling results for a project where we assess oil and gas well integrity loss in Colorado. We have now moved on to another project where I am helping Mr. Chauhan QC water well sampling data. Our goal is to identify the strains of methanogenic bacteria in water wells contaminated with microbial methane. Graduate Resident Advisor Served as a liaison between University of Colorado Residence Life and floor of 40 students for two years. Mentored first year students through personal and academic issues. Organized monthly educational and community building programs for students of the residence hall. AirWaterGas Outreach Team Member SERVICE Developed curriculum based on the science of unconventional oil and gas development for an online summer course for local middle and high school teachers. Collaborated with visiting middle and high school teachers to develop age appropriate classroom activities and lessons for their students focused on unconventional oil and gas development. Presented the classroom activities and lessons developed by local middle and high school teachers to other teachers at the 2015 Colorado Science Teacher s Conference and the 2015 AGU Geophysical Information for Teacher s Workshop. Worked through classroom activities that explain the science of hydraulic fracturing annually with visiting high school students. Peer Reviewer Listed in order of frequency Fall Present Water Resources Research, Journal of Hydrology, Journal of Water Resources Planning and Management, Petroleum Science, Groundwater. Sustainability, Energy and Environment Community Book Club Founding member and discussion leader Attended weekly meetings to discuss readings from environmentally focused books. Fall Present Water Resources Graduate Student Group Fall Present Shared research methods and techniques with other environmental and water resources graduate students during weekly meetings. HONORS & AWARDS Best Presentation, CU Hydrologic Sciences Student Research Symposium April, 2017 Environmental Engineers of the Future Fellowship August, 2011 Chevron Environmental Systems Scholarship August, 2010 &

5 TECHNICAL STRENGTHS Codes Computer Languages Data Management & Analysis Spatial Analysis Debugging Visualization MODFLOW-2000, PFLOTRAN Fortran 2003, Python, SQL, Bash, MATLAB PostgreSQL, Python Pandas, Microsoft Excel QGIS, ArcGIS, PostGIS Gnu Project Debugger (GDB), Python Debugger (pdb) VisIt, Matplotlib, MATLAB, L A TEX, Microsoft Word PRESENTATIONS Invited Seminars [1] Lackey, G H Rajaram, OA Sherwood, TL Burke and JN Ryan. Well integrity loss and stray gas migration in Colorado: insights from data and modeling. Colorado School of Mines WE2ST Seminar Series. December, [2] Lackey, G and H Rajaram. Assessing the frequency of oil and gas Well integrity loss in Colorado through measurements of surface casing pressure. AirWaterGas Seminar Series. November, [3] Lackey, G and H Rajaram. Bradenhead pressure in colorado. Halliburton Technical Seminar Series. November, [4] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan. The Occurrence of Bradenhead Pressure in the Denver-Julesburg Basin. Anadarko Health, Safety, and Environment Guest Speaker Series, May Conference Presentations [1] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan. Surface Casing Pressure, Well Integrity Loss, and Stray Gas Migration in the Wattenberg Field, Colorado. National Groundwater Association, Groundwater Quality and Unconventional Oil and Gas Development: Current Understanding and Science Needs Workshop, April [2] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan. The Occurrence of Surface Casing Pressure in the Denver-Julesburg Basin and Implications for Stray Gas Migration. Groundwater Protection Council, Underground Injection Control Annual Conference, February, [3] Sherwood, OA, JD Rogers, G Lackey, TL Burke, SG Osborn and JN Ryan. Sources of Groundwater Methane in the Denver-Julesburg Basin of Colorado. Groundwater Protection Council, Underground Injection Control Annual Conference, February, [4] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan. Well integrity in Colorado s Denver- Julesburg Basin: conventional vs. unconventional wells and implications for stray gas migration. Geological Society of America Annual Meeting, September [5] Lackey, G, LS Gardiner and DT Birdsell. The Science of Fracking. AGU-NESTA GIFT Workshop, American Geophysical Union, Fall Meeting, December [6] Rajaram, H, DT Birdsell, G Lackey, S Karra, H S Viswanathan and D Dempsey. Modeling Studies to Constrain Fluid and Gas Migration Associated with Hydraulic Fracturing Operations. American Geophysical Union, Fall Meeting, December [7] Hafich, KA, LS Gardiner, G Lackey and DT Birdsell. The Science of Fracking: Activities Developed by Colorado Teachers and Scientists. Colorado Science Conference, November [8] Sherwood,OA, JD Rogers, G Lackey, TL Burke. SG Osborn and JN Ryan. Identification and occurrence of thermogenic stray gas in groundwater wells of the Dever-Julesburg and Piceance Basins of Colorado. Geological Society of America Annual Meeting, October

6 [9] Lackey, G, RM Neupauer, and J Pitlick. Effects of varying stream channel conductance on siting new pumping wells in an aquifer. World Environmental and Water Resources Congress, American Society of Civil Engineers, May [10] Lackey, G, RM Neupauer, and J Pitlick. Representing a spatially and temporally variable streambed in stream depletion models. American Geophysical Union, Fall Meeting, December Poster Presentations [1] Lackey, G, H Rajaram. Modeling the buildup of annular pressure in cased and uncased annuli of faulty wellbores. American Geophysical Union, Fall Meeting, December [2] Neupauer, RM, G Lackey, J Pitlick. Analytical solution for stream depletion with time-varying streambed hydraulic conductivity. American Geophysical Union, Fall Meeting, December [3] Birdsell, DT, H Rajaram and G Lackey. Capillary Imbibition of Hydraulic Fracturing Fluids into Partially Saturated Shale. American Geophysical Union, Fall Meeting, December [4] Lackey, G, H Rajaram, S Karra, OA Sherwood and TL Burke. Modeling Methane Leakage from Faulty Wellbores in the Denver-Julesburg Basin, Colorado. American Geophysical Union, Fall Meeting, December [5] Gardiner, LS, B Hatheway, JD Rogers, JG Casey, G Lackey, DT Birdsell, K Brown, M Polmear, S Capps, J Rosenblum, K Sitterley, KA Hafich, M Hannigan and D Knight. The AirWaterGas Teacher Professional Development Program: Lessons Learned by Pairing Scientists and Teachers to Develop Curriculum on Global Climate Change and Regional Unconventional Oil and Gas Development. American Geophysical Union, Fall Meeting, December [6] Neupauer, RM, G Lackey and J Pitlick. Effects of Spatio-Temporal Variations in Streambed Conductance on Stream Depletion. American Geophysical Union, Fall Meeting, December [7] Rogers, JD, OA Sherwood, G Lackey, TL Burke, SG Osborn and JN Ryan. Occurrence and origin of methane in relation to major ion concentrations in groundwater wells of the Denver-Julesburg and Piceance Basins of Colorado. American Geophysical Union, Fall Meeting, December [8] Lackey, G, RM Neupauer, and J Pitlick. Implications of assuming a simplified streambed in stream depletion models. Geological Society of America Annual Meeting, October [9] Lackey, G, RM Neupauer, and J Pitlick. Effects of spatial and temporal variations of streambed hydraulic conductivity on stream depletion calculations. MODFLOW and More Conference, June [10] Lackey, G, RM Neupauer, and J Pitlick. Effects of riverbed conductance on stream depletion. American Geophysical Union, Fall Meeting, December Other Presentations [1] Lackey, G, H Rajaram, OA Sherwood, TL Burke and JN Ryan. Surface Casing Pressure as an Indicator of Well Integrity Loss and Stray Gas Migration in the Wattenberg Field, Colorado. 12th Annual Hydrologic Sciences Student Symposium, University of Colorado, April [2] Lackey, G and TL Burke. Oil and gas well integrity on the Front Range of Colorado using publicly available data, gathered from the Colorado Oil and Gas Conservation. Analyze Boulder, Energy Data Night. March, [3] Lackey, G, RM Neupauer, and J Pitlick. Varying Stream Channel Conductance and its Effects on Stream Depletion Estimations. 8th Annual Hydrologic Sciences Student Symposium, University of Colorado, March