Page 187 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

Edwin H. Lin, PG, CHG

accommodated in the Mid Valley and Palm Desert and provide long‐term water level and
water quality benefits for nitrate and chromium‐6. CVWD is currently moving forward with
environmental planning and final facility design at the Palm Desert site. Results of the TEL
study indicated that future CVWD recharge, pumping and drain operations could be optimized
to maximize groundwater storage, recovery effectiveness, and water quality.
Managed Aquifer Recharge Feasibility Study, Western Alto Subarea, Upper Mojave River
Basin, Mojave Water Agency (MWA)
MWA is evaluating the feasibility of recharging SWP water in off‐river surface spreading basins
within the western Alto Subarea of the Upper Mojave River Groundwater Basin (Basin). A
successful MAR project in the region would increase MWA’s capacity to store and recover
SWP water and provide future long‐term replenishment of the Regional Aquifer. Since 2016,
Todd Groundwater has been assisting MWA with field investigations to characterize the
subsurface stratigraphy and infiltration potential of the vadose zone, which extends down to
550 feet below ground surface. As project manager, Mr. Lin designed and supervised the first
phase of field investigations, which included regional surface geophysical surveys and field‐
scale infiltration testing complemented by borehole infiltration tests. Infiltration tests were
conducted at three sites by MWA staff under direction of Todd Groundwater, with test basin
2
geometries ranging from approximately 600 to 1,800 ft . Tests were conducted from 15 to 21
days. Results indicated that near‐surface soils at all three sites are relatively permeable and
generally suitable for recharge through surface spreading basins. Average vertical infiltration
rates were 1.6, 4.3, and 11.1 ft/day for the three sites. The project is proceeding to the second
phase of investigation with drilling, installation, and groundwater quality sampling of two
sonic‐drilled monitoring wells, evaluation of geochemical (leaching) properties of selected
vadose zone sediments, and borehole instrumentation to track the vadose zone wetting front
during future pilot‐scale infiltration tests.

Pure Water Monterey Phase 1 and 2 Injection Well Facilities Design and Construction,
Monterey One Water
The Monterey Peninsula Pure Water Monterey (PWM) Project involves the recharge of 3,500
acre‐feet per year of advanced treated recycled water into the Seaside Groundwater Basin.
Todd Groundwater has completed detailed hydrogeologic assessments over several years
with emphasis on the evaluation of target aquifers, recharge methods, and injection and
recovery sites. Mr. Lin serves as manager of the project’s field programs, which to‐date has
included the installation of the project’s first deep injection well and initial monitoring wells.
Field activities have included sediment core analysis for hydraulic and geochemical
assessment, geochemical assessment of recycled water and groundwater compatibility, and
regional groundwater quality monitoring. Mr. Lin has evaluated recharge impacts to satisfy
project EIR requirements, prepared 60%, 90%, and 100% design submittals of well drawings
and technical specifications for two phases of construction (including the installation,
development, equipping, and performance testing of two deep injection wells, a vadose zone
injection well, and seven monitoring well clusters), and is managing and coordinating the
drilling and installation of all deep injection, vadose zone, and monitoring wells. Additionally,
Mr. Lin is working with project water reclamation to establish water treatment goals and civil
engineers to ensure conveyance pipelines can accommodate peak recycled water deliveries
to injection well facilities.

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