ITASCA DENVER - Key Persons
Dr. Jang has over 20 years of experience in hydrogeologic modeling, subsurface contamination investigations, and remediation design.
His expertise is in numerical modeling of single- and multiple-phase subsurface flow and chemical transport, including groundwater flow, reactive contaminant transport, and gas flow through soil media in the vadose and saturated zones.
Dr. Jang has developed several multiphase flow models, including a TechFlowMP model (a three-dimensional multiphase flow, multispecies transport model). Dr. Jang is a Professional Engineer in Colorado.
Education
Ph.D. (Environmental and Water Resources Engineering), 2005
Job Titles:
- Senior Project Hydrogeologist, E.I.T
Ms. Johnston is a hydrogeologist with more than 9 years of experience in groundwater hydrogeology and geochemistry.
Job Titles:
- Geophysicist
- Principal Hydrogeologist
Dr. Stone is a geophysicist with more than 30 years of experience in applied hydrogeology. His areas of expertise include the following: baseline hydrogeologic evaluations; the design and development of water-supply, dewatering, water-control, and water-disposal systems for both underground and open-pit mining operations; hydrogeologic assessments to support scoping, pre-feasibility, and feasibility studies; assessments/predictions of pore pressures in open-pit highwalls; water resources studies for environmental impact analyses; numerical modeling of groundwater flow and chemical transport for water quantity/quality predictions; and assessments of glacier mass balance and subglacial water flow.
Dr. Stone's mining work has included technical studies for planning, feasibility, engineering-design, permitting, mitigation/remediation, and closure projects, as well as for due diligence assessments and third-party contractor reviews/environmental impact study (EIS) preparation for National Environmental Policy Act (NEPA) studies.
He has worked internationally on mining projects in Australia, Canada, Ecuador, Mexico, and Russia. His experience also includes litigation support, public testimony, and expert reports.
Job Titles:
- Expert
- General Manager / Senior Hydrogeologist, Ph
Dr. Steven Meyerhoff is an expert in conceptual and numerical model development for mining hydrogeology projects. Dr. Meyerhoff has conducted more than 25 numerical groundwater flow-modeling studies for large-scale open-pit and underground mines in Nevada, Arizona, Canada, Europe, South America, and Africa.
Mr. O'Brien has over 30 years of hydrogeology experience for mining, agricultural, industrial, commercial, and governmental clients. He specializes in mining hydrogeology that includes characterization, predictive modeling, permitting, and operational dewatering. He has experience in the design, planning, and implementation of characterization programs that support the groundwater flow and chemical transport modeling. He employs a variety of pumping and injection testing methods to estimate the hydraulic properties of soft and hard-rock aquifers and fractured systems. He develops an understanding of the physical processes and long-term trends by monitoring groundwater, surface water, and water quality. He has directed and installed vibrating-wire piezometers, traditional piezometers, monitoring wells, and temporary monitoring wells according to the project-specific needs.
Mr. O'Brien directs the conceptualization, construction, and calibration of groundwater flow models that represent the natural hydrologic system and the built environment. He uses predictive modeling to support environmental impact evaluations, mine dewatering programs, open-pit designs, and pit slope stability analysis. These analyses are used to support mine permits, feasibility studies, environmental impact statements, mine operations, and CERCLA site closure actions.
Dr. Xiang has more than 15 years of experience applying numerical groundwater modeling to mining projects. His areas of expertise include mine dewatering and depressurization and unsaturated flow. He has extensive experience in the numerical modeling of groundwater and the development of related codes. He has helped to develop and maintain the current numerical groundwater modeling program at ITASCA, MINEDW.
Dr. Xiang has worked on numerical groundwater models for open-pit and caving operations at mines including Jwaneng, Ernest Henry, Guyana Gold Mine, and Stornoway Diamond Mine. He also serves as the internal expert on groundwater flow models and the high-level reviewer of the models developed by others.
Education
Ph.D. (Hydrology and Water Resources), 2007
University of Arizona
Job Titles:
- Accounting Manager
- Office / Accounting Manager
Mrs. Swaim is involved in all aspects of accounting, office administration and human resources for Itasca Denver, Inc. With more than 30 years of training and experience, she assists technical staff with budget tracking, invoicing, administrative tasks and client communication.
Job Titles:
- Technical Editor / Administrative Assistant
Ms. Page has over 9 years of copy editing and technical editing experience. She reviews and edits all documents and ensures consistency and adherence to ITASCA standards.
She also manages the project document database and assists staff with day-to-day office support. She earned her B.A. in English from Metropolitan State University of Denver.
Job Titles:
- Civil Engineer
- Chilean Civil Engineer
Dr. Doyle is an environmental geochemist with 17 years of experience working on issues related to mine water quality. She received her doctorate from Colorado School of Mines and conducted research on cycling of manganese in mining-impacted environments and its impacts to associated elements, including molybdenum, lead, copper, and zinc.