Our Purpose
The purpose of CGWA is to advance the understanding of groundwater hydrology among its membership and the residents of Colorado.  CGWA organizes monthly speaker presentations, field trips, community volunteer opportunities, social/networking events and publishes a quarterly newsletter.  We are committed to facilitating the wise use of the State's groundwater resources by providing a forum to examine the scientific, technical and policy-making issues related to groundwater.

From its inception in 1981, CGWA has been a positive and proactive organization. Because of the voluntary efforts of its members, the Association has played an active role in shaping the use and protection of groundwater in Colorado. CGWA leverages the diverse areas of expertise of its members and expands the scope of the profession of groundwater hydrology often cooperating with other related organizations to sponsor conferences.

 

Board of Directors

 
Past-President -Betsy Semmens

Past-President -Betsy Semmens

Betsy Semmens has 20 years of experience as a groundwater professional in Arizona and Colorado. She works for Golder Associates specializing in numerical modeling. Betsy is married and has two teenaged kids. In her free time she enjoys running, reading, and endlessly driving her kids all over town.

 
President - Dennis McGrane

President - Dennis McGrane

Dennis McGrane, C.P.G, P.E., is owner of McGrane Water Engineering, llc (MWE).   He has 34 years of groundwater consulting experience with the last 30 years in Colorado, primarily with MWE (6 yrs), Leonard Rice (22) and Layne (4).   He enjoys municipal and industrial water supply projects (wells, pumps, planning, depletion analyses), groundwater modeling, and providing expert testimony in water rights related cases.   He is currently actively involved with the ASCE Managed Aquifer Recharge (MAR) Standards committee.   He was the past president of AWRA (2011), and was a member of the 1984 and 1988 US Olympic Ski-Jumping Teams.   He has been a CGWA member since 1989.

 
Vice President- Tom Dea

Vice President- Tom Dea

Tom Dea is a Senior Project Manager with Lamp Rynearson, formerly TZA Water Engineers.  Tom started working on water wells in Commerce City in 1978 while he was still in High School. Tom graduated from New Mexico School of Mining and Technology with a BS in Geological Engineering in 1985 and worked for Layne Western as a project manager for 15 years before becoming a partner at TZA in 2001.  Tom is a past president of the CGWA and looks forward to getting more involved and helping CGWA into the 2020’s!

 
Treasurer - Hoyt Sutphin

Treasurer - Hoyt Sutphin

Hoyt B Sutphin has a M.S. in Geology from Northern Arizona University and a B.S. in Geology from SUNY Geneseo.  He is a licensed Professional Geologist in Utah and a state of Colorado listed UST Consultant. Hoyt has been a CGWA member since 1996 and the Treasurer for 10+ years.  He is a Senior Project Manager with CH2M in Englewood and his focus is groundwater assessment and remediation on private client sites under various state (WY, CO, UT, NE) and federal regulatory programs.  

 
Secretary - Andrew Flor

Secretary - Andrew Flor

Andy Flor is a Hydrogeologist with the Colorado Division of Water Resources.  His responsibilities include groundwater-level monitoring, researching hydrogeologic conditions in aquifers within Colorado, evaluating aspects of hydrogeology pertinent to water rights, well permits and nontributary petitions, and acting as staff for the State Board of Examiners of Water Well Construction and Pump Installation Contractors.  He has a BS and MS in Geology from Southern Illinois University Carbondale and worked as a Geologist/GIS Analyst with the Florida Geological Survey before coming to DWR in 2012.

 
Director - Javier Vargas-Johnson

Director - Javier Vargas-Johnson

Javier Vargas-Johnson is a Water Resource Engineer with the Colorado Division of Water Resources on the South Platte River Basin Team. His responsibilities include evaluation of well permits, SWSPs, county referrals, and supporting the public in matters of ground water and well permitting. He previously worked with Quantum Water & Environment, the Fish and Wildlife Service as a Hydrologist, and RMC Consultants as an Environmental Scientist. Outside of work, Javier enjoys back-country snowboarding and other outdoor activities.

 
Director - Ashley Lennon

Director - Ashley Lennon

Ashley has a B.S. in Geology and Business Management from Colorado State University. She lived in Vail for 10 years where she worked with the Eagle River Watershed Council in community outreach and riparian remediation projects before moving to Evergreen with her husband and daughter. She works for the Colorado Division of Water Resources on the South Platte River Basin Team in the evaluation of well permits and supporting the public in matters of groundwater and well permitting.  Ashley enjoys spending time with her family in the mountains skiing, hiking and fishing.