Dave Colvin

Experience

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  Student Conservation Association

  Jun 1996 - Sept 1996

  Aquatic Biologist

  Student Conservation Association volunteer at Mount Rainier National Park. Conducted field investigations in sub-alpine areas to survey and monitor wetland areas. Performed aquatic field sampling and testing, wetland classification, biological species identification, and aquatic laboratory analyses.

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  Mt. Rainier National Park

  Jun 1997 - Oct 1997

  Aquatic Biologist

  Crew leader for an aquatic ecosystem survey in Mt. Rainier National Park. Conducted field investigations in sub-alpine areas to survey and monitor wetland areas. Performed aquatic field sampling and testing, wetland classification, biological species identification, and aquatic laboratory analyses.

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  Weston Solutions, Inc.

  Jan 1998 - Jan 2000

  Geologist

  Conducted field investigations at the former Stapleton International Airport in Denver, Colorado to define nature and extent of free-phase and dissolved-phase hydrocarbon contamination. Tasks included lithologic logging with hollow-stem auger and direct-push drilling rigs; soil, groundwater, and vapor testing; operation and maintenance of remediation equipment; data evaluation and reporting.

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  MFG, Inc.

  Jan 2000 - Jan 2004

  Hydrogeologist

  Provided hydrogeological and environmental support for investigation, monitoring and remediation of mines, processing, hydrocarbon, and other non-aqueous phase liquid contamination sites. Services included field investigations of soil, water, and air; sample analysis; data management; data analysis; reporting; GIS; permitting and regulatory agency interaction.

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  Tetra Tech

  Jul 2004 - Sept 2009

  Hydrogeologist

  Supported City of Aurora’s Prairie Waters project near the South Platte River, CO. Field investigation and construction tasks included field oversight of drilling, well construction, pump/motor installation, aquifer testing, system start up testing, well field yield optimization, and geotechnical investigations. Support also included the design, construction, and operation of alluvial recharge and riverbank filtration pilot test facilities. Developed and implemented pilot test procedures, including tracer studies to assess flow paths, travel times, and stream/aquifer interaction. MODFLOW modeling support for the Prairie Waters Project included development of regional MODFLOW groundwater model for Colorado Division 1 case 2006CW104. Performed parallel processing model calibration using UCODE. Prepared expert and rebuttal reports, exhibits and materials used in settlement negotiations for case 2006CW104. Provided support for abandoned mine hydrology and geochemistry, groundwater modeling to support water development and management, well design, oversight of drilling and well installations, sampling, geographical information systems, permitting and regulatory agency interaction. Show less

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  Geomega, Inc.

  Sept 2009 - May 2010

  Hydrogeologist

  Provided MODFLOW modeling in support of alluvial recharge and mining related analyses. Performed detailed water balance studies including point flow surface water modeling to evaluate stream gain/loss; net recharge groundwater inputs incorporating precipitation, irrigation, evapotranspiration; well inventories and pumping estimates; groundwater underflow assessments. Implemented PEST automated model calibration in a parallel processing environment.

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  Leonard Rice Engineers, Inc.

  Jun 2010 - May 2013

  Hydrogeologist

  • Project manager and lead Hydrogeologist for Tarrant Regional Water District investigation into effectiveness of riverbank filtration for water quality improvements along the Trinity River. Project tasks include geotechnical, hydrogeologic, and geophysical field investigation, groundwater modeling, and design, construction and testing of riverbank filtration pilot test sites.• Serving on the Eastern Snake Plain Hydrologic Modeling committee and participating in the support and oversight of MODFLOW modeling activities in the Eastern Snake Plain. Expert witness in support of a water rights hearing (IDWR Case No. CM-DC-2011-004) involving complex surface water and groundwater interaction of the Eastern Snake Plain Aquifer.• Development of regional MODFLOW models used to estimate well field yield and land subsidence due to groundwater pumping in Arizona. Work included aquifer characterization, lithologic modeling, model development, automated model calibration and predictive uncertainty analysis using PEST, subsidence modeling with the SUB-WT package, and evaluation of subsidence related observations and empirical relationships.• Review of USGS Northern Arizona Regional Groundwater Flow Model.• Expert witness providing hydrogeology support of water rights for a Boulder County Parks and Recreation augmentation pond.• Review of several different models along the South Platte River and its’ tributaries in support of, or objection to, water rights cases.• Support of groundwater development projects along the Colorado Front Range. Show less

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  LRE Water

  May 2013 - now

  Dave is a Principal Hydrogeologist and Senior Project Manager with experience in groundwater hydrology, water resources, and environmental sciences since 1996. He supervises teams of diverse subject matter experts and provides technical leadership to solve today's water resource challenges. Dave serves as the LRE Groundwater Team Leader responsible for managing staff, resources, projects and schedules for a group of hydrogeologists across the West, Midwest and Texas. His technical expertise subject areas include water supply development, groundwater governance & management, surface water/groundwater interaction, riverbank filtration (RBF), soil aquifer treatment (SAT), managed aquifer recharge (MAR), aquifer storage and recovery (ASR), aquifer characterization, groundwater modeling, and subsidence caused by groundwater pumping. He conducts and supervises hydrogeologic investigations involving project management, aquifer testing, 3-D geologic modeling, groundwater flow/transport modeling, uncertainty analysis, hydrogeophysics, water rights, expert testimony, environmental geology, and regulatory support. Show less Team leader managing staff, resources, and schedules for a group of hydrogeologists and technicians performing groundwater work.Conducts and supervises hydrogeologic investigations, including project management, aquifer characterization and testing, geologic and environmental systems modeling (including MODFLOW groundwater modeling), and water rights support. Groundwater modeling work includes automated calibration (PEST and UCODE), parallel processing, geologic conceptual modeling, and evaluation of model uncertainty. Show less

  • Groundwater Team Leader

    Jun 2015 - now

  • Groundwater Team Leader

    May 2013 - Jun 2015