Page 106 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

Groundwater Supply and Sustainable Yield

• Analyzed groundwater quality trends for naturally occurring constituents of concern in the
Borrego basin.
• Conducted peer review and analysis of geologic and hydrologic evidence used to prepare
submission of BBM Request for the Cuyama and San Antonio Groundwater Basins, under
the SGMA.
• Assessed sustainable yield using network of groundwater wells, stream gauges, and soil
moisture probes for a private ranch in eastern San Diego County.
• Prepared technical memorandum regarding comparing the County of San Diego methodology
for assessing sustainable yield to site specific data on stream flow and runoff.
• Prepared recharge and sustainable groundwater production estimate for a 25,000 acre
private ranch using the Santa Barbara County methodology for determining CEQA
significance thresholds.
• Evaluated the impacts of naturally occurring hexavalent chromium [Cr(VI)] on water quality at
production wells owned and operated by the Santa Ynez River Water Conservation District.
Compiled and analyzed intraborehole flow data and depth discrete water quality sample
results documenting vertical variation of Cr(VI) concentrations in aquifer.
• Prepared County Groundwater Investigation Report update to County of San Diego Pine Valley
Cumulative Groundwater Study.
• Assisted with analysis of aquifer test data and water quality sample results for a groundwater
resources assessment for a large concentrating photovoltaic solar projects encompassing
1,473 acres of land.
• Provided peer review for Groundwater Resources Investigation Report for a 765 acre solar
energy system in eastern San Diego County.

Groundwater/Surface Water/Habitat Interaction – Ecohydrology
• Evaluated transpiration data collected as part of an assessment of the potential for
groundwater development to impact native plant populations in the upland and riparian
areas of a watershed in eastern San Diego County.
• Estimated habitat water requirements using changes in soil moisture in order to assess the
water demands of native plant populations on a private ranch in Santa Barbara County.
• Conducted an ecohydrology study evaluating water demands of riparian plant population
supported by wastewater effluent in Imperial County in order to assess the potential impact
of a reduced water supply.
Litigation Support

• Prepared Draft Feasibility Study analyzing alternatives for both water supply and remediation
in the Chino Basin necessitated by trichloroethylene contamination in a groundwater aquifer
with municipal supply wells. Identified potentially responsible parties and potential
groundwater pathways from upgradient sources.
• Assisted with the geochemical analysis evaluating the potential contribution of Bradley
Landfill to groundwater contamination in the North Hollywood Operable Unit of the San
Fernando Valley Superfund Site.
• Evaluated the subsurface geologic constraints, generated geochemical history, and created
an operational ranking matrix, to assist with cost allocation for perchlorate contamination at
the Bermite site in Saugus, California.

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Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 104 of 208