Page 44 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

be an iterative process utilizing the Yucaipa Basin groundwater flow model developed by the
USGS.

Depending on the modeling results and sustainability criteria established, we recommend
performing pilot‐scale infiltration testing at preferred investigation sites to fill critical
knowledge gaps and support implementation of a basin recharge program. Pilot‐scale
infiltration tests will require excavation of a recharge basin commensurate in size with the
full‐scale recharge basin, conveyance and metering of test water sufficient to fill and
maintain a constant‐head, and accurate measurement of pond water levels. Recommended
actions for each investigation site are summarized below followed by site‐specific details.

Table 4
Recommended Future Investigation/Testing Activities

Estimated Recommended Action
Adjacent Long‐Term New
Exploratory Infiltration Rate Pilot Monitoring Basin
Test Site Boring (ft/d) Testing 1 Well(s) Cleaning 2
Tennessee Street Basins 2.7 Yes Yes
Dunlap Channel 0.0 No No
Chapman Heights Basin 2.5 Yes Yes
10th Street and Avenue E EX‐7 3.2 Yes Yes
Wildwood Creek at California Street EX‐5 0.9 No No
Wilson Creek Basins EX‐1 1.8 No No Yes
City of Yucaipa at California Street EX‐5 4.0 Yes No
Wilson Creek III EX‐3 13.0 Yes Yes
Oak Glen Creek Basins EX‐2 5.2 No No Yes
Wildwood Creek Basins EX‐4 9.8 Yes Yes
Oak Glen Creek at Western Heights EX‐9 0.35 No No

Notes:
1 ‐ Recommended pilot testing assumes recharge will help to achieve basin/subbasin sustainability goals.
2 ‐ Basin cleaning is recommended at the Wilson Creek Basins and Oak Glen Creek Basins if site recharge
goals are expected to exceed the current operational capacity of the basins.

Western Heights Subbasin

Tennessee Street Basins / Chapman Heights Basins: Depending on the size of the full‐scale
basin, pilot‐scale infiltration testing is recommended to identify potential site vadose zone
storage capacity constraints due to recharge mounding and benefits to the Western Heights
Subbasin. Installation of monitoring wells north and south of the Western Heights Fault is
recommended to confirm groundwater levels beneath the sites and to better understand
the hydraulic connection to the Western Heights Subbasin.

Infiltration Testing at Eleven
Investigation Sites in the Yucaipa
Basin, Yucaipa Valley, CA 23 TODD GROUNDWATER

Yucaipa Sustainable Groundwater Management Agency - January 23, 2019 - Page 42 of 137