Page 50 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

City of Pismo Beach/WSC Inc.: Central Coast Blue - Central Coast Blue is a regional recycled water
project that will help reduce the risk of seawater intrusion and help improve sustainability for the
region’s water supply. Johnson is leading efforts to evaluate existing characterization studies,
groundwater models, and water quality data. He is also constructing and calibrating an expanded
groundwater model to evaluate injection and extracting scenarios, and conduct an anti-degradation
analysis.

California American Water, Monterey Peninsula Water Supply Project (MPWSP) - Johnson led efforts
to update a three-dimensional variable density flow and solute transport model for the North Marina
Area in 2008 and constructed a focused groundwater model near the CEMEX gravel plant in Marina, CA.
Johnson helped revise and update the Salinas Valley Integrated Surface Water and Ground Water Model
(SVIGSM) which are currently being used to evaluate local and regional impacts on groundwater levels
and quality from MPSWP operations.
Western Municipal Water District: Impact of Recharge on Contaminant Plumes and Modeling -
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.
Jurupa Community Services District: Chino Basin Artificial Recharge Evaluation - Johnson led modeling
efforts to modify a previously established groundwater flow model of the Chino Basin to incorporate
solute transport and assess the impact of artificial recharge operations planned by the Chino Basin
Watermaster on Nitrate and TDS concentrations in the southern Chino Basin.

Rancho California Water District: Surface and Ground Water Model of the Murrieta-Temecula Ground
Water Basin - Johnson was the lead modeler to create an Integrated Ground Water and Streamflow
Model of RCWD. Johnson worked with a technical panel that included, RCWD, USGS, U.S. Marines, Camp
Pendleton, Stetson Engineers, Santa Margarita Watermaster, and GEOSCIENCE. The technical was
formed to avoid litigation between RCWD and the Camp Pendleton Marine Base. Johnson is responsible
for preparation of the model and analysis of the results.

Santa Ana Watershed Project Authority: Chino Desalter System Projects - Johnson developed a
detailed analysis of the Chino Ground Water Basin that included a three-dimensional numerical ground
water flow model (MODFLOW). A separate analysis was also conducted to assess potential water quality
changes in project and existing wells as a result of the project.

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.

Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 49 of 208