Saul Montoya Heredia M.Sc. Senior Hidrogeologist Numerical Modeler Gidahatari

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1 Profile: Mr. Montoya is a Civil Engineer graduated from the Peruvian Catholic University in Lima with postgraduate studies in Management and Engineering of Water Resources (WAREM Program) from Stuttgart University Germany with mention in Groundwater Engineering and Hydroinformatics. Mr Montoya has a strong analytical capacity for the interpretation, conceptualization and modeling of the surface and underground water cycle and their interaction. He is in charge of numerical modeling for contaminant transport and remediation systems of contaminated sites. He is an expert on the different tools for numerical groundwater modeling and distributed hydrological modeling, besides other softwares for water resources management and spatial data analysis. Mr. Montoya is related to programming and develops algorithms for the hydraulic parameters analysis, as well as specific coding for the water-surface interaction. Mr. Montoya has done research on the regional flow on the Arabic Peninsula. In Peru, he has a wide experience on mining hidrogeology. For more than 7 years he has been involved on several projects regarding baseline studies, environmental impact studies, mine closure planning, impact assessment of the mining projects on the water resources. Carrer Summary: 2011 date Technical Director,, Lima 2009 date Associated Teacher, Catholic University, Lima Hydrogeologist Numerical Modeler, MWH Peru, Lima Numerical Modeler, Golder Associates, Lima Hydrogeologist Numerical Modeler, Ground Water International, Lima Education/Professional Development: 2005 Master of Science in Water Resources Engineering and Management WAREM, Universität Stuttgart, Germany Full scholarship from the Catholic Academic Exchange Service, Germany 2001 Bachelor of Science with major in Civil Engineering, 1 st Class, Peruvian Catholic University, Lima

2 Research: Ongoing Thesis advisor: Distributed hydrogeological modeling of the Rimac Basin and impact evaluation from global warming Ongoing Thesis advisor: Multiphase flow modeling for hydrocarbon contamination in groundwater Ongoing Thesis advisor: Regional surface-groundwater modeling considering unsaturated flow calibrated with remote sensing 2010 Investigation Program: Coupling Earth Observation Data into a hydrological model for an andean basin 2008 Investigation Program: Water Balance Analysis using GIS 2005 Master Thesis Project: Modeling of the groundwater flow in the catchment of the Al-Haza oasis and verification with isotope information 2004 Independent Study Project: Relating actual drawdown values in pumped wells to the drawdown in corresponding coarse grid finite difference groundwater flow models and vice versa Teaching: Mr. Montoya teaches the following courses on water resources: Mining Hidrogeology GIS in Water Resources Management Management and Interpretation of Water Chemistry Data Environmental Flow Determination Python in Hidrology Applied Hydrology with HEC-HMS He is teacher of this group of courses on groundwater modeling: Aquifer Modeling with MODFLOW Tailings Seepage Modeling with MODFLOW Contaminant Transport Modeling with MODFLOW and MT3DMS Geochemical Modeling with PHREEQC Software Skills: Groundwater Flow Modeling: MODFLOW, MT3DMS, MODPATH, PHEERQC, PHAST, FEFLOW Model Muse, Visual MODFLOW, GMS, GWViewer Hydrological Modeling: USGS-PRMS, HEC-HMS, SWAT, PyTOPKAPI Programing Languages: Python, IPython, Scipy, Numpy, Matplotlib, Django Geographical Information Systems: QGIS, Saga GIS, Map Window, ArcGIS

3 Field Hydrogeology Skills: Mr. Montoya is proficient on the following field hydrogeology tasks: Hydrogeological mapping Sampling of water physical and chemical parameters Piezometer development and sampling Groundwater monitoring networks design Low flow gauging in gullies Flow gauging in rivers Design and develop of pumping test Diver installation Soil pit pumping test Project Experience: Quechua Project Hydrogeological Study, Cuzco Peru. Numerical modeler for the simulation of tailings leakage and interaction with pit inflows. Analysis of the water balance from rainfall - runoff over the entire mine area of influence. Groundwater regime modeling in transient mode with FEFLOW along mine life and closure. Distributed Hydrological Modeling for the Galeno Mining Project, Cajamarca Peru. Hydrological modeling with USGS PRMS on an andean basin with high dependence on the watershed response from elevation. Modeling work was coupled with earth observation data and had three steps of calibration. Navidad Mining Project Hydrogeological Study, Patagonia Argentina. Distributed hydrological modeling with USGS PRMS with snow accumulation. Main interest on recharge evaluation to the groundwater system in an arid environment. Hydrogeologist responsible for developing the hydrogeological model to predict the groundwater resource potential, inflows to mine workings and potential drawdown impacts. Transient numerical modeling undertaken with MODFLOW, PEST and Visual MODFLOW Antapaccay Project Environmental Impact And Feasibility Assessment, Cuzco Peru. Numerical modeler in charge of assessing pit inflows as well as impact on regional groundwater flow regime. Numerical tasks regarding mine drainage were also developed over the mine life and pit flooding was iteratively evaluated. Transient numerical modeling undertaken with MODFLOW, GIS and Visual MODFLOW Hydrogeological Model of Irrigation Areas Antamina Huarmey Port, Peru. Hydrogeologist on hydrogeological mapping, Guelph permeameter testing, well monitoring, nitrogen slug testing and hydrochemical data processing. Data analysis and hydrogeological model conceptualization.

4 West Marcapunta Project Hydrogeological Study - El Brocal Mining Company, Pasco Peru. Hydrogeologist responsible of groundwater modeling the West Marcapunta Project. Discretization of rock alterations. Simulation of future scenarios of mine development. Application of direct and indirect indicators to model groundwater flow. Comprehensive understanding of actual and future tunnel inflows. Global Hydrogeological Study El Brocal Mining Company, Pasco Peru. Numerical modeling of the entire area of interest of open pit operations and underground mining from Colquijirca Mining Unit. Numerical representation of the current water inflows to the mine and prediction of future inflows related with the mine expansion. Static and transient numerical modeling with MODFLOW and Visual MODFLOW. Paragsha Mining Unit Hydrogeological Study Cerro De Pasco, Volcan Mining Company, Pasco Peru. Numerical modeling of groundwater flow regime in the current open pit and underground operations of the Paragsha Mining Unit. Model calibration with current inflows to surface and underground mining works and transient inflow simulation related to expansion of mining operations. Impact assessment in the regional groundwater flow regime from the construction of a drainage tunnel to the Milpo river basin. Puntayacu Tunnel Hydrogeologic Study Simsa Mining Company, Pasco Peru. Modeling of actual mine inflows to the San Vicente Mine and the future connection scenario with the Puntayacu Tunnel. Complex regional model conceptualization calibrated with current inflows. Transient numerical modeling simulation undertaken with MODFLOW, SURFACT and Visual MODFLOW Pomatales Gully Basin Hydrogeologic Study - Ferrocarril Transandino S.A., Cuzco Peru. Groundwater evaluation from remote sensing interpretation, spatial data analysis and numerical modeling. Groundwater flow characterization on the area of influence of the Quebrada de Pomatales between the railroad progressive Km to Km Numerical modeling with MODFLOW under static conditions.

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