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A-12 | Groundwater Sustainability Plan for the Yucaipa Basin Area | San Bernardino Valley Municipal Water District
Ambient Water Quality Recomputation for Upper Santa Ana River Integrated Model |
the Santa Ana River Watershed Groundwater San Bernardino Valley Municipal Water Distct
Management Zones | Basin Monitoring
Program Task Force Mr. Robert Tincher, PE, Manager of Engineering &
Planning | (909) 387-9215 | bobt@sbvmwd.com
Mr. Mark Norton, Water Resources & Planning Manager
(951) 354-4221 | mnorton@sawpa.org Currently the Santa Ana River (SAR) passes
The Water Quality Control Plan (Basin Plan) for the over four groundwater basins, multiple water
districts, and has nine separate groundwater
Santa Ana River Basin requires the implementation and watershed models—making it difficult
of a watershed-wide total dissolved solids (TDS) and to identify current conditions and potential
nitrogen groundwater monitoring program. This will impacts that planned projects could have on
determine ambient water quality in groundwater, groundwater and the watershed as a whole.
assess compliance with groundwater quality Complicating matters is that the basins are
objectives, and determine if assimilative capacity hydrologically connected to several other
exists in groundwater management zones. basins in the area. Geoscience is developing
Mr. Cruikshank managed the 1996-2015 version a combined model for the Santa Ana River
of the triennial AWQ recomputation. The study that will help determine baseline hydrological
computed current AWQ for TDS and nitrate-nitrogen conditions and the potential effects of
in all 40 groundwater management zones in the Santa proposed projects on the Santa Ana River
Ana River watershed and interpreted the results. The and groundwater levels for the entire upper
project involved collecting, processing, and storing all watershed.
groundwater quality and groundwater levels data from Staff assigned: Johnson Yeh, Brian Villalobos, Kapo
1996-2015 in a centralized database. The database Coulibaly, Nathan Reynolds, Lauren Wick, Leo Liu
developed point statistics for nitrate and TDS, and
groundwater quality and elevation contour maps were
prepared in the management zones with requisite Relevance to Project:
data, and computed the volume-weighted ambient • Ability to identify effects of current and
TDS and nitrate-nitrogen concentrations using the proposed projects on the watershed as a
data generated from the contour maps. Interpretive whole
tools included a spatial analysis of groundwater quality
change, a temporal analysis of groundwater change • Combining multiple models and working
comparing basin-scale trends to trends observed in with stakeholders that will also be involved
key well locations, and a forward-looking well attrition in this project
analysis. • Use and refinement of groundwater and
surface water models, including GSFLOW
Staff assigned: Michael Cruikshank and HSPF provided by multiple parties,
Relevance to Project: including USGS
• Facilitated SAR Watershed Stakeholder Engagement
• Extensive knowledge of groundwater management
zones and water quality objectives
Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 31 of 208
