Page 243 - _ 180314 Special Yucaipa GSA Packet
P. 243
Johnson Yeh, PhD, PG, CHG
Principal Modeler
For more than 26 years, Johnson has managed ground
water modeling efforts, hydrogeologic investigations,
Years of Experience: 27 ground water basin and water quality studies, and artificial
Years with GEOSCIENCE: 26 recharge projects. He performs detailed statistical analysis
of various types of data and has been the lead modeler on
many high profile projects—in fact, he was instrumental
Education: in helping to resolve one of the larges groundwater rights
BS, Geology, National Taiwan University cases in California, and developed models that helped
a nearby water district to successfully avoided costly
MS, Geology, National Taiwan University litigation. Johnson teaches a graduate level ground water
modeling class at the University of Southern California and
PhD, Sedimentology, University of Southern his experience and knowledge will provide detailed and
California thorough analyses that help inform future strategies and
projects.
Professional Registrations:
California Professional Geologist (No. 6371) Selected Project Experience
Certified California Hydrogeologist (No. 422 San Bernardino Valley Municipal Water District: Santa Ana
River Integrated Model
Johnson is leading our team in an effort to use existing
groundwater and surface water models to develop an
integrated watershed model for the upper Santa Ana River.
What Johnson brings to the project... The resulting Upper SAR Integrated Model (or Integrated
SAR Model), will be used to determine what factors may
contribute to declines SAR flows, and assess cumulative
• Extensive groundwater modeling experience— effects on SAR surface flows and groundwater levels.
will accurately perform the analysis with suffi-
cient detail to inform future decisions Yucaipa Valley Water District: Recycled Water Use
• Experienced with the Yucaipa Groundwater Evaluation using the Gateway Sub-basin Focused
Basin—more accurate and thorough analysis Groundwater Model
that takes existing basin conditions into account Johnson was the senior modeler overseeing the
construction of a groundwater model used to predict the
• Understands how to combine multiple models impacts of recycled water spreading on groundwater quality
and data sources—provide a clear picture of the and to downstream municipal wells.
current groundwater conditions and allow for
accurate predictions and estimates San Bernardino Valley Municipal Water District:
Remediation Strategies for Ground Water Contamination
Johnson was the project manager and lead ground
water modeler to refine previous USGS models to better
understand, analyze, and evaluate remediation alternatives
related to ground water contamination problems.
Rancho California Water District: Integrated Water
Resources Plan
Johnson led efforts to determine the natural safe yield
from the Murrieta-Temecula Ground Water Basin and
developed groundwater flow models to determine recharge
26 capabilities from surface and imported water supplies.
Years of groundwater modeling Western Municipal Water District: Impact of Recharge on
Contaminant Plumes and Modeling
experience Johnson was the project manager and lead ground water
modeler to assess and model the area around the Riverside-
Corona Feeder, to show the potential future impact of an
initial operation scenario on the ground water levels and
ground water quality in the San Bernardino Basin Area.
Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 215 of 226
