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Following review, confirmation, and rectification adjacent basins. Dudek will draft the ”Plan
of preliminary data gaps, the list of data gaps Area” section of the “Plan Area and Basin
and a technical memorandum summarizing the Setting” chapter for the GSP based on the
assessment of the existing data will be provided location of the modified basin boundaries that
to the GSA. This is a critical step to inform resulted from previous mapping and surveying
development of the Monitoring Program and efforts to characterize the physical attributes of
Sustainability Criteria and will yield the most the Basin watershed. Additionally, the plan area
defensible assessment in accordance with DWR section will include a summary of the
requirements. The data assessment will include jurisdictional areas, water resources monitoring
three components. and management programs, and land use and
general plans. Critical to the success of any
Data Conformance: As many assessments have GSP is stakeholder engagement. The
been performed in the Basin by various entities, description of the beneficial uses and users of
it is expected that inconsistencies exist. the basin, as well as the description of public
Inconsistencies may include variable engagement notification and participation will
specifications for the same well or other also be included in this chapter.
features, differing units (metric/imperial, acre-
feet/gallons, etc.). The data conformance Task 4. Water Budget and
screening will consider the data and reporting
standards specified in the GSP Emergency Sustainable Yield
Regulations (§ 352.4), which specifies the use
of water volumes in acre-feet, elevations using The numerical model will be constructed to
NAVD88, GPS locations using NAD83, and well simulate the water budget for the Basin from
identification nomenclature. 1980 to 2016. This historical water budget may
serve as the baseline water budget from which
Data Relevance: Data will be assessed with future projects and climate change effects may
regard to relevance to the applicable SGMA be evaluated. However, if future conditions will
sustainability indicators. Data that are not differ significantly from historical conditions, the
relevant would be flagged as such. baseline water budget will be distinct from the
historical water budget. If no such changes are
Data Gaps: Geographic areas within the Basin identified, then the historical water budget will
will be categorized into subsets according to the be incorporated into the numerical model and
ability to address each of the sustainability will serve as the baseline water budget.
indicators. An area will be assigned “no data”,
“insufficient data”, or “sufficient data” for each The baseline water budget will be prepared
of the sustainability indicators. For areas using the results of the numerical groundwater
designated as “no data” or “insufficient data”, model. Inputs to the model will be developed in
an overview of the specific data needed will be coordination with the GSA, TAC, and USGS. The
provided. For areas designated as “sufficient model will provide a coherent estimate of the
data”, an overview of why the available data are input and outputs to the system, including
sufficient will be provided. The sufficiency of estimates of subsurface flow between the
data could be based on time history, parameter seven sub-basins (i.e., potential management
type, or data quality. areas) in the Basin.
Dudek will work with the GSA to prepare the
Task 3. Plan Area Including Land Use
input criteria that will be used to model the
Valley District submitted a request in 2016 to long-term sustainability of the Basin. These
modify the DWR Bulletin 118 basin boundary input criteria will be based on the
defined for the Basin to reflect the physical historical/baseline water budget, as well as on
watershed boundary and to close gaps between the future climate scenarios provided by DWR.
Develop Groundwater Sustainability Plan for the Yucaipa Basin Area Page 4
Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 82 of 208
