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<br />PROFESSIONAL EXPERIENCE
<br />• Moody and Associates, Inc., Meadville, PA, August 1973 to May 1975
<br />1 Delaware Geological Survey, Newazk, DE, June 1975 to August 1977
<br />1 Strategic Petroleum Preserve Office, Washington, DC, September 1977 to March 1979
<br />• Hydro-Seazch, Inc., Lakewood, CO April 1979 to December 1979
<br />• Envirosphere Corporation, Division of Ebasco Services, Golden, Colorado, January 1980
<br />to February 1984
<br />• Boyle Engineering Corporation, February 1984 to March 2005
<br />~ Lytle Water Solutions, LLC, Highlands Ranch, Colorado: March 2005 to Present.
<br />PROJECT EXPERIENCE
<br />Mr. Hahn has over 30 yeazs ofdirect experience in the execution and management of hydrogeologic
<br />and water resource investigations for municipal, state and federal agencies, and the mining, energy,
<br />power, and water supply industries. He specializes in ground water resource investigations in
<br />support of water supply planning and development, appraisal of long-term reliability of supplies,
<br />aquifer storage and recovery, mine/mill water supplies, pit inflows, and numerical modeling. He has
<br />had direct responsibility for design, construction and testing of over 200 potable supply wells in
<br />diverse geologic settings, with well depths ranging from less than 25 feet to over 2,400 feet. His
<br />experience includes design and construction of injection wells for fluids disposal ranging in depth
<br />from 90 feet to over 8,000 feet, including directionally drilled wells. His experience includes
<br />virtually all types of completions, materials of construction, and drilling methods. Mr. Hahn has
<br />served as an expert witness in State Water Court, Federal District Court, and in a case before the
<br />U.S. Supreme Court. He has authored numerous technical papers on the subjects of ground water
<br />development, deep well injection, and aquifer storage and recovery, including two chapters of the
<br />Colorado Ground Water Atlas. hi 1999, Mr. Hahn served on a panel of 16 experts from across the
<br />nation in reviewing an EPA risk assessment relative to aquifer storage and recovery and Class V
<br />injection wells.
<br />:Representative Project Experience: Aquifer Storage and Recovery
<br />City of Aurora, Investigation of Ground Water Storage Alternatives, Aurora, CO. Principal
<br />investigator on a study of the feasibility of aquifer storage. Project included conceptual well design,
<br />pipeline alignments, wellhead facilities, instrumentation and control facilities, and estimate of
<br />probable construction costs.
<br />Peace River Facility Aquifer Storage Recovery Expansion,Sarasota,FL. Projecthydrogeologist
<br />responsible for technical support and oversight. Managed development of a system planning and
<br />operations model to guide design of plant expansion and perform long-range forecasting of firm
<br />yield of the facility. Scope of services included planning, design, and construction-phase services
<br />fora 6-mgd expansion of a surface water treatment plant to 18-mgd capacity, as well as the addition
<br />of 14 aquifer storage-recovery wells fora $12.4-million project. The project includes raw water
<br />WILLIAM F. HAH N, PG
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