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Statement of Qualifications

Mining Support

Relevant Projects01Mission – San Xavier APP, Pima County, Arizona

Carlota Copper Project APP Significant Amendment, Miami, Arizona

Aquifer Protection Permit Amendment / BADCT Demonstrations, Hayden, Arizona

Morenci APP, Morenci, Arizona

Mine Groundwater Remedial Investigation and Feasibility Study, Tohono O’odham Nation, Arizona

Mission Mine APP & Modeling Study, Pima County, Arizona

Sierrita and Twin Buttes Mines, Pima County, Arizona

Copper Queen Branch, Bisbee, Arizona

Groundwater Resources Evaluation / Exploration, Safford, Arizona

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Mission ‐ San Xavier APP AsarcoPima County, Arizona

PROJECT DETAILS

YEAR COMPLETED:Ongoing

TEAM MEMBERS:Greg Hess – PMMelanie Lindsey

RELEVANCE:APP

Clear Creek completed an APP application for the Asarco Mission‐San Xavier mine south of Tucson, Arizona. The project included compilation of extensive volumes of waste and aquifer characterization data and completion of a hydrogeologic study. The APP was issued in January 2014. Permitted discharging facilities included three tailings impoundments and four rock deposition areas.

Clear Creek is currently conducting a study of groundwater quality and hydraulic gradients in the vicinity of the San Xavier pit and the adjacent rock deposition area. ADEQ included this investigation in the San Xavier APP as a compliance schedule item, for the purpose of evaluating the extent of the passive containment capture zone around the pit.

PROJECT DETAILS


TEAM MEMBERS:Greg Hess – PMDoug BartlettAlison JonesBen Daigneau

RELEVANCE:APP

Carlota Copper Project APP Significant AmendmentCarlota Copper Company Miami, Arizona

Clear Creek Associates began providing hydrogeologic consulting services to Carlota Copper Company in 2013, including helping Carlota obtain a Significant Amendment to its existing APP. ADEQ issued a draft amended permit to Carlota for review in June 2014, and as a result of Clear Creek’s efforts, the number of Point of Compliance monitoring wells in the new permit will be reduced from twelve to six. In addition, all four Alert Level monitoring locations included in the previous permit will be eliminated in the new permit.

Clear Creek also completed a 5‐year Groundwater Assessment Report, which was a requirement of the previous APP. In addition, Clear Creek prepares quarterly and annual groundwater and surface water monitoring reports, as required by the Carlota EIS. Clear Creek is currently working with Carlota to streamline and improve the monitoring conducted pursuant to the EIS.

PROJECT DETAILS

YEAR COMPLETED:2010

TEAM MEMBERS:Doug Bartlett – PMAlison JonesMike AlterBen Daigneau

RELEVANCEAPP

Aquifer Protection Permit Amendment / BADCT Demonstrations ASARCO‐Hayden Operations Hayden, Arizona

Clear Creek Associates teamed with Tetra Tech Inc., and Axelrod, Inc. to prepare this permit amendment. Clear Creek Associates was the prime contractor. The ASARCO Hayden Operations and Plant Site (Hayden Operations) is located approximately 60 miles north of Tucson. The plant is an active copper ore processing, concentrating, and smelting facility located in Gila and Pinal County, Arizona. The site has been used for ore processing and smelting for almost 100 years. The uses of facilities have changed over the years, and facilities have been built, removed, or moved, resulting in a complex site history. ASARCO applied for an Aquifer Protection Permit (APP) from the Arizona Department of Environmental Quality (ADEQ) in 1994 for the Hayden Operations. On June 4, 2009 an area‐wide APP, was issued by ADEQ for the project. The permit contained a detailed compliance schedule for on‐going APP‐related requirements, including a requirement for submittal of Best Available Demonstrated Control Technology (BADCT) demonstrations for the facilities listed in the compliance schedule.

Tasks conducted for this project included: • Facilities Classification: Each facility listed in the compliance schedule was assessed with regard to the APP statutes and rules. The objective of this task was to identify facilities that could potentially qualify for a specific exemption from APP, as per A.R.S. §49‐250 or as non‐discharging per A.R.S 49‐201.01.

• Materials and Solution Characterization: The APP rules require characterization of the materials and process solutions produced by a facility requiring an Individual APP. The permit compliance schedule specifically required characterization of the solution and tailings for the mill tailing impoundments. Clear Creek reviewed the previous characterization data, identified data gaps, prepared a sampling and analytical plan, implemented the plan, tabulated and analyzed the data, and wrote a Materials and Solution Characterization report that was appended to the amendment document.• BADCT Demonstrations: Engineering/BADCT analysis for each existing facility requiring an Individual APP was completed. Current discharge control technologies (DCTs) and site factors were identified, performance of the current design and aquifer loading were evaluated, technically feasible alternative DCTs were identified, cost vs. discharge reduction was evaluated for each BADCT alternative, and a BADCT alternative was recommended. A stormwater analysis was conducted to evaluate whether stormwater was contained at the site. While previous stormwater analyses indicated that there was not containment, anecdotal evidence suggested otherwise. Our analysis, conducted primarily by team member Tetra Tech, indicated that there was not containment. However, it was recommended that further data be collected in order to calibrate the model.

PROJECT DETAILS

TEAM MEMBERS:Doug Bartlett – PMMike Alter

RELEVANCE:APPModeling

Morenci APP Phelps Dodge Morenci, Arizona

While with a prior firm, Clear Creek Associates principals Doug Bartlett and Mike Alter served as Project Manager and Project Hydrogeologist during preparation of the Morenci District Aquifer Protection Permit for Phelps Dodge Morenci, Inc. The project included evaluation of the hydrogeology of a 100 square mile area, demonstration of a passive containment capture zone, definition of the discharge impact area of more than 300 facilities, and demonstration of BADCT for facilities shown to have potential for discharge to groundwater.

Field investigations included the installation of more than 70 monitor wells and piezometers, the sampling and testing of soil, ponded water, and miscellaneous discharges, and aquifer testing of monitor wells. Numerical groundwater flow models were developed to support the demonstration and future existence of the passive containment capture zone. The application and a draft permit were prepared over a two‐year period for final submittal on March 30, 1996. ADEQ issued an APP in July 2000.

Mine Groundwater Remedial Investigation / Feasibility Study Cyprus Tohono Corporation and Freeport‐McMoRan Copper & Gold, Inc. Tohono O'odham Nation, Arizona

PROJECT DETAILS


TEAM MEMBERS:Tom Suriano – PMMike AlterGreg Hess

RELEVANCE:ModelingGroundwater RI

The Cyprus Tohono Corporation Mine is located approximately 30 miles southwest of Casa Grande, Arizona on lands leased from the Tohono O'odham Nation. Mining operations included underground mining, in‐situ leach mining, and open pit mining. The CTC Mine is currently in care and maintenance status. Clear Creek Associates is providing Project Management support for the overall Groundwater RI/FS at the CTC Mine Site and is currently conducting investigation activities for the groundwater RI. Over the years, Clear Creek Associates has coordinated and overseen multiple geophysical investigations and groundwater investigations at the mine property. Additionally, in 2004 Clear Creek Associates worked with CTC and the Tohono O'odham Nation to site and install two new supply wells to serve the community of North Komelik.

Approximately 60 new monitor wells have been installed to characterize groundwater conditions over a 30 square mile area. Clear Creek Associates has developed a groundwater model for the Site and worked with CTC to demonstrate the existence of a hydraulic capture zone in the area of the underground workings and mine pit. The presence of the hydraulic capture zone will be a key element in future evaluations alternatives of affected groundwater in the area of the open pit and the former in‐situ mining operations. The compounds of interest at the site include Uranium, Sulfate and Perchlorate. The results of the investigations were documented in the Remedial Investigation Report.

Mission Mine APP & Modeling Study AsarcoPima County, Arizona

PROJECT DETAILS

YEAR COMPLETED:2007

TEAM MEMBERS:Doug Bartlett – PMMike Alter

RELEVANCE:Groundwater ModelingAPP

Clear Creek Associates completed a groundwater modeling study on behalf of Asarco to satisfy the requirements outlined in the compliance schedule included in the Asarco Mission Complex APP. The compliance schedule required that Asarco submit a hydrogeologic study that predicted the Discharge Impact Area at the time of mine closure.

The hydrogeologic system in the area of the Asarco Mission Complex is complex due to its location along the Santa Cruz Basin margin. Bedrock, consisting of Paleozoic sedimentary units and Laramide intrusive rocks, is encountered at a depth of approximately 150 feet below land surface (bls) in the area of the Mission Pit. Unconsolidated and semi‐consolidated basin fill sediments overlie bedrock throughout the Asarco Mission Complex.

The model codes MODFLOW and MODPATH were used for this project. The horizontal model grid contained 164 rows and 167 columns for a total of 27,388 cells per layer. With a total of three layers, the model contained 82,164 calculation cells. The cell dimensions varied from 1320 feet by 1320 feet on the edges of the model to 330 ft by 330 ft in the area around the Asarco Mission Complex. The total area of the model domain was approximately 460 square miles. MODPATH particle tracking was used to show the direction and rate of groundwater transport from the Asarco Mission Complex facility boundaries. The particle tracks demonstrated that the Point of Compliance (POC) monitor wells were appropriately located to monitor groundwater quality downgradient of the Asarco Mission Complex facilities.

PROJECT DETAILS

YEAR COMPLETED:2013

TEAM MEMBERS:Doug Bartlett – PMPaul Plato

RELEVANCE:Groundwater Modeling

Sierrita and Twin Buttes Mines Freeport McMoRan Pima County, Arizona

Clear Creek Associates developed a groundwater flow model for the Sierrita and Twin Buttes Mines located about 25 miles south of Tucson, Arizona. The model was constructed using the MODFLOW‐SURFACT groundwater model code and simulates groundwater flow and pit lake interaction using the “LAK3” module of MODFLOW. The LAK3 module takes into account inflows and outflows to a lake and predicts the lake water level based on the interaction of the lake and the surrounding groundwater.

The bedrock aquifer in the model area consists of intrusive igneous rocks (granite and granodiorite), extrusive igneous rocks (andesites and rhyolites) and Paleozoic sedimentary rocks (sandstones and limestones). The model covers an area of about 210 square miles, with 19 layers and 830,585 active calculation cells. The model cells are 100 meter x 100 meter.

The objective of the Clear Creek model was to simulate future groundwater flow and pit lake formation around the open pit excavations at both mines, and to evaluate passive containment capture zones around the pits. The extent of the capture zone was important for establishing Best Available Demonstrated Control Technologies (BADCT), in support of the Twin Buttes Mine APP issued in 2007 and the Sierrita Mine APP issued in 2011. The model results showed that the combined area of the passive containment capture zones around the Sierrita‐Esperanza and Twin Buttes pits was more than 40 square miles after 200 years.

PROJECT DETAILS

YEAR COMPLETED:2014

TEAM MEMBERS:Jim Norris – PMPaul Plato

RELEVANCE:Groundwater Modeling

Copper Queen Branch Freeport McMoRan Bisbee, Arizona

Clear Creek Associates updated and refined a groundwater flow and transport model for evaluating sulfate concentrations near Bisbee, Arizona. The model was completed as part of a remedial investigation (RI) and has been applied to possible remediation proposals in a recently completed feasibility study (FS). This model has been used to assist in evaluating possible remedial actions involving pumping of sulfate impacted groundwater and mitigation of possible impacts to private wells.

The groundwater model is a four‐layer Modflow/MT3D model which covers 50 square miles of Arizona and Sonora, Mexico. The model simulates groundwater flow in alluvial fill and fractured Cretaceous sedimentary bedrock. Model simulations were calibrated for groundwater flow and transport from 1905 to present, and includes 122 wells, including municipal supply and private domestic wells.

Groundwater Resources Evaluation / Exploration Freeport McMoRan Safford, Arizona

PROJECT DETAILS

YEAR COMPLETED: Ongoing

TEAM MEMBERS:Doug Bartlett (PM)Mike Alter

RELEVANCE:Water Resource Investigation

Clear Creek has managed the evaluation of groundwater supply resources for FMI in Safford since the mid‐1990s in order to identify and develop water sources for their copper mines in the area. The project has included gravity and seismic geophysical surveys, exploration borings, test wells, borehole geophysics, airlift tests in boreholes, and aquifer tests in completed wells. A variety of drilling methods have been employed, depending on the expected geology and the function of the boring or well.

Drilling methods have included direct rotary drilling, dual tube reverse circulation with air, and flooded reverse circulation drilling. Clear Creek manages subcontractors, is onsite during all drilling and testing activities, and analyzes all test results. The project has involved extensive analysis and interpretation of structural geology, including fracture orientation analyses based on acoustic borehole imaging televiewer logs.

02 Team Resumes

Doug Bartlett, R.G.

Mike Alter, R.G.

Jim Norris, C.P.G., R.G.

Paul Plato, R.G.

Greg Hess, R.G.

Alison Jones, R.G.

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Douglas Bartlett, R.G. Principal Hydrogeologist

Doug Bartlett is a Principal Hydrogeologist and co‐founder of Clear Creek Associates. Over the past 38 years, he has built a solid reputation as a hydrogeologist with diverse experience in mining‐related hydrogeologic services, groundwater computer modeling, and hydrogeologic investigations. Mr. Bartlett's consulting experience is varied, but has been dominated by services that support mining. In particular, he has assisted mining clients with various permitting requirements including the groundwater portions of National Environmental Policy Act (NEPA) documents needed for federal land exchanges, the Aquifer Protection Permit (APP) required to develop mines in Arizona, the Arizona Pollutant Discharge Elimination System (AZPDES) permits needed for discharge of process waters (including groundwater from aquifer testing) to surface waters, and permits to allow installation and testing of water wells. His expertise on groundwater modeling has been used to evaluate open pit dewatering requirements, the impact of open pit mining on local groundwater, the impact of discharge from tailings and waste rock on groundwater, the design of remediation systems to mitigate existing impacts to groundwater from mining operations, and the impacts of water supply pumping on groundwater resources near mining properties. Mr. Bartlett has designed and overseen many hydrogeologic studies on both large scale (basin‐wide) and small scale areas that support mining development and/or mine closure. In total, Mr. Bartlett has worked at more than 100 mining properties in the U.S. and in several countries throughout the world.

Relevant Mining Experience

Freeport McMoRanSafford District , AZ • Mr. Bartlett oversaw the drilling and testing of a pilot hole and installation of a large‐diameter production well for the Dos Pobres Mine. The pilot hole was drilled to a depth of 2,000 feet and was tested by the air lift method to assure that well location is adequate to support a large production well. • Mr. Bartlett conducted a pit dewatering study for the Dos Pobres Open Pit mine. He used a detailed spreadsheet to assemble the information needed to compute future groundwater inflow rates to the Dos Pobres Pit. Using existing information about groundwater levels surrounding the pit, water level decline rates observed in monitor wells, testing information regarding the permeability of the rock aquifer, and information from the mining engineering department regarding the likely future pit geometry, Mr. Bartlett computed annual average pit inflow rates over time. • Mr. Bartlett provides on‐going support for compliance with environmental permits for the Dos Pobres / San Juan mine. An EIS permit requires annual review of groundwater level data to assess the potential impact of groundwater pumping for mine operations on the Gila River and Bonita Creek. Various groups of monitor wells are evaluated to assess changes in water levels and hydraulic gradients between the mine and the Gila River. Groundwater modeling is used to evaluate the potential that groundwater pumping may someday have on flows in the Gila River. As impacts are observed in monitor wells, the regional groundwater model for the site is assessed to determine how well these changes have been simulated.

Freeport McMoRanSierrita Mine, Tucson, AZ Mr. Bartlett oversaw the development of a large groundwater computer model of the Sierrita and Twin Buttes Mines that simulates the future development of mine pit lakes in several open pit excavations. The model utilizes the USGS model code MODFLOW and the LAK3 module to simulate the development of pit lakes. The model domain encompassed 211 square miles and included more than 1 million calculation cells. The prediction results will be incorporated in Aquifer Protection Permit applications and amendments to existing permits to demonstrate future passive containment capture zones. Phelps Dodge Iron King MineCottonwood, AZMr. Bartlett was the senior technical advisor to Phelps Dodge for the implementation of acid mine drainage remedial measures. He worked with Phelps Dodge staff and their consultants to implement a Voluntary WQARF remedy through the ADEQ. The proposed action, batch treatment and release from underground workings, required an NPDES permit and approval from ADEQ. Phelps Dodge Tohono MineSouth of Casa Grande , AZMr. Bartlett was the technical advisor for groundwater issues and participated in on‐going negotiations with the Tohono O'odham Nation regarding the impacts to groundwater of various mining operations at the property. In 2001. Mr. Bartlett developed a groundwater model of the site used to assess groundwater flow around an open pit lake.

EDUCATIONMS Geology, Colorado State University, 1984

BS Geology, Colorado State University, 1977

Colorado School of Mines, 1986 Hydrogeology: Well Construction and Design

REGISTRATIONSRegistered Geologist AZ

Professional Geologist AK

Professional Geologist CA

Registered Geologist OR

Professional Geologist PA

Licensed Geologist WA

PROFESSIONAL MEMBERSHIPSAmerican Society of Civil Engineers

National Ground Water Association

Arizona Hydrological Society

American Institute of Professional Geologists

International Association of Hydrogeologists

Society of Mining Engineers

CLEAR CREEK TENURE15 Years

INDUSTRY TENURE38 Years

Michael Alter, R.G. Principal Hydrogeologist

Mike Alter is a Principal Hydrogeologist based in Clear Creek Associates' Leesburg, Virginia office. Mike started and managed Clear Creek Associates' Tucson office until 2011 when he moved to Virginia and started the Virginia office. Mr. Alter is a member of Clear Creek Associates' mine water management group and actively supports mine‐related projects in the southwest U.S. as well as the East Coast. In addition, he represents both private and public sector clients on water resources and environmental projects. His experience includes 19 years coordinating and managing environmental and water resources‐related projects. His areas of specialization include investigating and characterizing groundwater systems, including mining districts and active and closed municipal landfills. Mr. Alter has planned and managed numerous successful field investigations, involving activities such as borehole drilling, geophysical logging, zonal sampling, well design and construction, aquifer testing, and water quality testing. He has a solid understanding of the specific hydrogeologic needs of the mining sector, as well as other clients developing and managing water resources in bedrock aquifers. He is also a member of Clear Creek Associates' groundwater modeling team.


Cyprus Tohono Corporation, Tohono O'odham Nation, AZ Project manager for Remedial Investigation of mining‐related groundwater impacts at the Cyprus Tohono mine, an inactive copper mine and mineral processing facility in Central Arizona. The RI/FS is being managed by US EPA under an Administrative Order on Consent. Groundwater in the area of the mine has elevated sulfate, uranium, and perchlorate.

Water Supply Development, Freeport‐McMoRan Miami, Claypool, AZProject Manager for the installation and testing of three new water wells to support Miami Smelter operations. Well designs were prepared based on the results of exploration drilling conducted in 2001. The project involved overseeing the drilling contractor, lithologic and geophysical logging, and aquifer testing. The wells were completed in various geologic units, including basin fill sediments, Tertiary volcanics, and Paleozoic carbonate (limestone) units. Each well met production goals.

Potential future mining operation, Confidential Client, Eastern Arizona Served as field manager and onsite project hydrogeologist on a water supply project for a confidential mining sector client. Mapped a six square mile area in structurally disrupted volcanic terrain to identify geologic structures that could potentially yield groundwater for future mine use. The objective of the project was to identify 6,000 gallons per minute of sustainable water. Mr. Alter supervised the drilling, design, installation, and testing of 17 test wells and four pilot production wells.

Pit Hydrology Study, Freeport McMoRan Bagdad Mine, Bagdad, Arizona Project Manager for hydrogeologic study of the Bagdad mine pit. The objective was to evaluate the effectiveness of on‐going mine pit dewatering activities. Field activities to date included test well drilling and analysis, groundwater quality sampling, isotopic analyses, and various aquifer tests comprising both falling head tests and long‐term pumping and recovery tests.

Mission Complex, Asarco Incorporated, Sahuarita, AZ Project hydrogeologist responsible for preparation of an Aquifer Protection Permit Application for the Asarco Mission Complex. This district wide permit application encompassed all discharging facilities at the mine including tailing impoundments and waste rock deposition areas. The hydrogeologic characterization required the installation of multiple monitoring wells and piezometers as well as a demonstration that facilities are not conducive to the generation of acid mine drainage or the mobilization of metals. An Aquifer Protection Permit was issued by the Arizona Department of Environmental Quality.

Phelps Dodge Mining Company,Arizona Locations As subcontractor to an engineering consulting firm, Mr. Alter conducted analysis of community water systems operated by PDMC to identify potential in‐well or new well strategies to bring each water utility into compliance with future arsenic standard. Evaluations were performed for water systems in Ajo, Baghdad, and Sierrita. For each site, Mr. Alter developed a list of potential well rehabilitation and well siting alternatives

EDUCATIONMS Geology, Arizona State University, 1994

BS Geology, Virginia Polytechnic Institute and State University, 1992

REGISTRATIONSProfessional Geologist VA

Professional Geologist PA

Professional Geologist AZ

PROFESSIONAL MEMBRESHIPSVirginia Water Well Association

Association of Engineering and Environmental Geologists

Arizona Geological Society

American Institute of Professional Geologists

National Ground Water Association

Society for Mining, Metallurgy and Exploration



Jim Norris, C.P.G., R.G. Senior Associate

Jim Norris began work in mineral exploration in 1978 and has specialized in environmental hydrology since 1986. He provides project management and senior level professional services for investigation of metal, petroleum hydrocarbon, and volatile organic compound (VOC) contamination; water resource assessments; permitting; and litigation support. His project responsibilities have included site characterization studies, collecting and interpreting hydraulic, pneumatic, and chemical data; conducting feasibility studies; designing and implementing remedial actions; risk assessment of groundwater, surface water, and soil; and applying numerical modeling techniques to hydrologic and hydrochemical problems.


Freeport‐McMoRan Sierrita Mine, AZTechnical lead for investigation and mitigation planning for a groundwater sulfate plume emanating from a tailing impoundment. The plume is being addressed under an order with ADEQ to protect local drinking water supply wells. Mr. Norris’ responsibilities include implementing and reporting work to define the extent of sulfate, development of groundwater monitoring plan and associated facilities, an inventory and sampling of drinking water supply wells, and quarterly monitoring and reporting of water levels and water quality. Work results were used to develop a groundwater flow and sulfate transport model used to evaluate mitigation actions for a feasibility study. The feasibility study recommended a mitigation action accepted by ADEQ and implemented by Sierrita. Mr. Norris developed updates, and provides ongoing evaluation of a wellfield designed to pump more than 10,000 gpm to control plume migration; provided technical specifications and installation oversight for extraction wells, and provides ongoing technical briefings at meetings with ADEQ and the community.

Freeport –McMoRanMiami Mine, AZResponsibilities included development of a site‐wide monitoring system of wells and piezometers in 1,200‐acre tailing impoundment system and the underlying bedrock and alluvial aquifers; geochemical characterization of metals and acidity in tailing, slag, and materials stockpiles including leaching testing, static acid base accounting, kinetic leach testing, and trace metal analysis; characterization of physical and hydraulic properties of saturated and unsaturated media for quantitative modeling of flow and contaminant transport; description of major flow paths acidity and metals in a complex assemblage of saturated and unsaturated, natural and man‐made materials, including analysis of attenuation mechanism; and design and installation of groundwater extraction facilities used for source control.

Pinal Creek Water Quality Assurance Revolving Fund SitePinal Creek, ArizonaMr. Norris supervised and reported field, laboratory, and numerical modeling comprising the RI/FS for this Arizona Superfund site. The site consists of groundwater, surface water, and soils affected by acidity and metals in the watershed of a 100‐year old mining district. Mr. Norris was the lead technical consultant throughout the RI/FS and the conceptual remedial design. He has provided services on matters of contaminant migration and remediation, regulatory compliance, and litigation support. Examples of specific work include: • Development of an interim RAP accepted by ADEQ and EPA. The RAP was based on numerical modeling of metals and acidity transport under the proposed control action. Managed the installation of a 600 gpm wellfield for the RAP.• Manager of human health and ecological risk assessments considering carcinogenic and non‐carcinogenic risk from exposure to groundwater, surface water and soil. Worked with ADEQ, ADHS, USGF, and AGF in developing work plans. • Designed and conducted sampling program for kitchen taps and 100 private drinking water supply wells proximal to impacted water. Managed replacement of 40 drinking water wells.• Technical advisor for community relations plan and participant in public meetings.•Directed feasibility study of multiple remedial action alternatives. Numerical modeling was used to evaluate the remedial performance and estimate pumping/treatment costs. Managed engineering teams providing design and cost data. • Manager of treatability tests for lime neutralization, wetlands, and reducing bioreactor. • Designed two remedial wellfields for pumping up to 10,000 gpm. One wellfield uses subsurface groundwater barrier 100 feet deep to 1,200 feet wide. Managed installation of 24 large capacity extraction wells. • Ongoing water management planning including water balances at storage facilities, rainfall runoff analysis, and development of operating and contingency plans.

EDUCATION

BS Geology, City College of New York, 1976

MS Geology, University of Arizona, 1981

MS Hydrology, University of Arizona, 1989

REGISTRATIONS

Registered Geologist AZ

Registered Geologist CA

Registered Geologist WA

PROFESSIONAL MEMBERSHIPS

American Institute of Professional Geologists Certified Professional Geologist



Paul Plato, R.G. Senior Hydrogeologist

Paul Plato is a Senior Hydrogeologist with 26 years of professional experience, including 24 years of groundwater experience in Arizona. His areas of expertise include groundwater modeling of alluvial and fractured bedrock aquifers; well installation and testing; database management and geographic information systems (GIS).


Arizona Public Service, PVNGS Tonopah, AZ Project Manager for the Palo Verde Nuclear Generating Station (PVNGS) Aquifer Protection Permit (APP) implementation project, which involves support activities for permit implementation and compliance. Project includes installation of monitor wells, statistical data evaluation, compliance groundwater sampling, evaluation and presentation of geologic and geophysical information and assisting PVNGS in preparing permit modifications.

City of Phoenix Phoenix, AZProject Manager for the City of Phoenix Groundwater Management Plan project, which includes a variety of individual projects including groundwater model development for groundwater resources management, planning, well siting, recharge evaluation and evaluation of existing wells. Project has included 5 major scopes of work since 2006, and includes development of a GIS based groundwater model encompassing the Salt River Valley portion of the Phoenix Active Management Area.

Freeport McMoRan Sierrita & Twin Buttes Mines Supported the groundwater model for Sierrita Mitigation Order Aquifer Characterization Report (ACR). Project included assistance with GIS and review of the groundwater flow and transport model.

Chino Grande Big ChinoPrescott, AZ Senior Hydrologist for groundwater model development in the Big Chino Sub‐basin, near Prescott, AZ. Project included development of a GIS based groundwater model encompassing the Big Chino Sub‐Basin, drilling, installation and testing of two production wells and preparation of a hydrology study documenting results.

Freeport McMoRan Bisbee, AZ Senior hydrogeologist responsible for updating and refining a groundwater flow and transport model used to evaluate sulfate concentrations near Bisbee, Arizona. The model was completed as part of the remedial investigation (RI) and has been applied to possible remediation proposals in a recently complete feasibility study (FS). This model has been used to assist in evaluating possible remedial actions involving pumping of sulfate impacted groundwater and mitigation of possible impacts to private wells. The groundwater model is a four layer Modflow/MT3D model which covers 50 square miles of Arizona and Sonora, Mexico near Bisbee, Arizona. Model simulates groundwater flow in alluvial fill and fractured Cretaceous sedimentary bedrock. Model simulation was calibrated for groundwater flow and transport from 1905 to present, and includes 122 wells, including municipal supply and private domestic wells.

Freeport McMoRanHenderson, AZ Senior hydrogeologist responsible for constructing a groundwater flow and transport model for evaluating tailings seepage concentrations near Henderson Mine in Colorado. The model was completed as part of an effort to evaluate possible tailing seepage impacts to nearby water resources. The groundwater model was a three layer Modflow/MT3D model which covers 9 square miles of Colorado. Model simulates groundwater flow in glacial till and alluvial sediments. Model simulations were calibrated for groundwater flow and transport from 2008 to present, and was used to evaluate future flow and transport for several possible mitigation scenarios.

EDUCATIONBS Geophysics, University of Arizona, 1986


PROFESSIONAL MEMBERSHIPSArizona Hydrological Society



Greg Hess joined Clear Creek Associates in February 2006 and has managed the Tucson office since 2009. Experience includes 23 years managing water‐related projects and working cooperatively with state and local governments on regional plans, policies and regulations. Mr. Hess has planned and managed numerous hydrogeological investigations, modeling studies, permitting projects, and water resource development projects at various locations in Arizona, including large copper mines. He has extensive experience with 100‐year Assured Water Supply demonstrations, Aquifer Protection Permit applications, and groundwater remediation projects. Prior to joining Clear Creek Associates, Mr. Hess managed the Pima Association of Governments (PAG) watershed planning program, where he conducted a variety of water quality and hydrogeologic studies and built strong working relationships with state regulatory agencies including the Arizona Department of Environmental Quality and Arizona Department of Water Resources.


Carlota Copper Project APP and EIS Hydrogeologic Services Miami, AZ Project Manager for numerous hydrogeologic services for the Carlota Copper Mine. Services include negotiation of a Significant Amendment to Carlota’s APP, preparation of a Groundwater Assessment Report required by the APP, and management of surface and groundwater quality and hydrogeologic monitoring and reporting required by the APP and EIS. Also calculated Alert Levels for Point of Compliance (POC) monitor wells and evaluated POC locations with respect to local hydrogeologic conditions. Succeeded in significantly reducing the number of POC’s in the APP.

Aquifer Protection Permit Application San Xavier Mine, AZ Lead hydrologist for the preparation of an Aquifer Protection Permit application for an inactive copper mining facility near Green Valley, Arizona. Project included compilation of waste characterization data and evaluation of the hydrogeology of the site. The permit was issued in January 2014.

Groundwater Model Update Tucson Airport Superfund Site, AZ Lead modeler for updating and applying a groundwater flow and particle tracking model for the Tucson Airport Remediation Project (TARP) in Tucson, Arizona. Completed a significant update to the specified head boundary and well packages, recalibrated the model, and converted the model to a new solver and user interface. Applied the model to evaluate contaminant plume capture by extraction wells under various pumping scenarios.

Tohono Mine Site Remediation Tohono O'dham Nation, AZ Participated in the preparation of a Remedial Investigation report for a copper mine in central Arizona. The mine included underground workings, in situ leaching, and an open pit. The investigation characterized the hydrogeology of the area and the nature and extent of groundwater contamination.

Silverbell Landfill Groundwater Remediation and Modeling Tucson, AZ Applied a contaminant fate and transport model to evaluate groundwater remediation options at a closed landfill. Provided recommendations for additional monitoring and prepared preliminary designs and cost estimates for extraction wells and injection wells. Designed and supervised the installation of monitor wells.

Pima Mine Road Groundwater Recharge Modeling Study Green Valley, AZ Project manager for a groundwater modeling study of the effects of various groundwater management alternatives on an existing groundwater recharge facility in Green Valley, Arizona.

Groundwater Contaminant Fate and Transport Model Yuma, Arizona Developed and applied a numerical groundwater flow model and contaminant transport model to evaluate the impacts of the recharge of treated effluent on total dissolved solids concentrations in groundwater near Yuma, Arizona.

EDUCATIONMS Geosciences, University of Arizona, 1992

BS Geology, Arizona State University, 1987


PROFESSIONAL MEMBERSHIPSArizona Hydrological Society

Statewide Water Quality Management Working Group



Greg Hess, R.G. Senior Hydrogeologist

Alison Jones' experience includes over 21 years conducting and managing hydrogeological and environmental projects. Areas of specialization include investigating and characterizing groundwater systems in support of: regional hydrogeological investigations for mining‐related permitting; active and closed municipal landfill evaluations; State and Federal Superfund site characterization; leaking underground storage tank sites; and power plant siting. Ms. Jones has planned and managed numerous successful field investigations involving activities such as drilling, geophysical logging, zonal sampling, aquifer testing, water quality monitoring, characterization and management of contaminated soil, and hazardous waste management.


Broadway Pantano WQARF Site, Landfill Operable Unit Remedial Investigation Tucson, AZ ADEQ selected Clear Creek to conduct a remedial investigation (RI) of the Landfill Operable Unit (LOU) of the Broadway‐PantanoWater Quality Assurance Revolving Fund (WQARF) site. The site is ADEQ’s top priority WQARF site due to PCE impacts to the City’s Central Wellfield downgradient of the landfills. Ms. Jones managed all phases of the investigation. Clear Creek Associates collected soil gas samples from over 150 soil gas probes, including deep‐nested soil gas probes, shallow perimeter probes, and shallow temporary probes that were installed in the landfills. Clear Creek Associates evaluated the data and wrote an RI report that delineated the extent of landfill waste and the extent of VOCs in the vadose zone. Fate and transport mechanisms were evaluated, and a conceptual model was proposed. A health risk assessment was conducted to evaluate outdoor/trespasser exposures at the landfills and indoor worker and indoor resident exposures at properties abutting the Broadway South Landfill. WQARF rules require that investigations include a community involvement component. Clear Creek Associates presented information to the Broadway‐Pantano Community Advisory Board (CAB), a group of interested citizens, on several occasions.

Oracle Ridge Mine Hydrogeologic Investigation Tucson, AZ Clear Creek conducted a hydrogeologic investigation of the underground mine site as part of a Significant Amendment of the mine’s Aquifer Protection Permit. Ms. Jones was the project manager. The Oracle Ridge Mine is located in the Santa Catalina Mountains north of Tucson. The fractured rock aquifer was characterized using water levels from piezometers and springs, slug testing data, fracture and fault orientation data, observations in the underground workings, and groundwater chemistry. Characterization of fractured rock aquifers can be challenging, but the different sources of data were all consistent with a single conceptual site model.

ASARCO, LLC Hayden Operations BADCT Demonstrations Hayden, AZ ASARCO retained the team of Clear Creek Associates, Tetra Tech, Inc., and Axelrod, Inc. to prepare best available demonstrated control technologies (BADCT) analyses for 83 facilities at its Hayden Operations. Clear Creek Associates was the prime contractor and Alison was the project manager. The project included evaluating facilities as to their applicability under ADEQ's Aquifer Protection Permit (APP) rules, materials characterization, stormwater analysis, and BADCT demonstrations. Because some of the facilities at Hayden Operations are almost 100 years old, there were many challenges in obtaining information regarding construction details and past uses.

Confidential Mining Sector Client Southeast Arizona Participated as part of Clear Creek’s team in preparation of an APP application to accommodate resumed mining at an inactive southeast Arizona copper mine. The envisioned project consisted of a 250 million ton oxide leach project and included the design and construction of a new leach pad and SX/EW plant. An area‐wide individual permit application was prepared for the new leach pad and SX/EW process and contingency ponds; it also included potentially acid‐generating waste‐rock stockpiles. Ms. Jones helped write parts of the application, including parts of the hydrogeology/geology section and the closure/post closure sections. Ms. Jones also managed the characterization of water in the underground workings, which were to be dewatered as part of the mine plan. This characterization included discrete‐depth sampling from mine shafts, temperature and fluid resistivity logging, research into the construction and layout of the underground workings, and preparation of a report with recommendations for a dewatering strategy.

Alison H. Jones, R.G. Senior Hydrogeologist

EDUCATIONMS Geology, Colorado School of Mines, 1983

BS Geology, Louisiana State University, 1979

Additional relevant coursework in groundwater modeling and hydrogeology, University of Southern Maine, 1992‐1995


PROFESSIONAL MEMBERSHIPSArizona Geological Society

Arizona Hydrological Society

Geological Society of America

National Groundwater Association



Practical Solutions in Groundwater Science

6155 East Indian School RoadSuite 200Scottsdale, AZ 85251(480)659‐7131

221 North Court AvenueSuite 101Tucson, AZ 85701(520)622‐3222

213A Loudon Street SWLeesburg, VA 20175(703)777‐4263

www.clearcreekassociates.com

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