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Infiltration Test Results

















        A                                         B







                                                                                                            E



                                                          A. SMWC fire hydrant setup
                                                          B. 4" fire hose and traffic barricades
                                                          C. Post-excavation / flow control skid setup
                                                          D. Test in progress (Day 1)
        C C                                       D       E. Test in progress (Day 7)





                    DRY SOIL (SILT)
                10-12 FEET BELOW
                CHANNEL BOTTOM








 Test Start  Aug-20-2018  Conclusions:
 Test End  Sep-03-2018  - Results of infiltration testing confirm/indicate that the site is favorable for recharge.
                       - Full-scale basin initial infiltration rates (based on 50% of measured field-scale testing infiltration
 Basin Dimensions (L x W) (ft)  33 x 32  rates) are estimated at 8.0 feet/day. Long-term infiltration rates (based on 50% of full-scale basin initial
 Average Water Height (ft)  3.0  infiltration rates) are estimated at 4.0 feet/day.
 2
 Infiltrating Area Basin Bottom (ft )  960  - While long-term estimates consider expected clogging of the basin bottom from SWP water,
                       actual long-term rates will be dependent on the specific site recharge goal and implementation
 2
 Infiltrating Area Basin Bottom + Walls (ft )  1,270  of a basin maintenance plan.
 City of Yucaipa
 Total Water Added (gallons)  1,646,180  - High infiltration rates are representative of almost exclusively coarse-grained deposits (sand/gravel)
 YVWD  at California Street  identified in EX-5.
 Total Water Added (acre-feet)  5.1  Hydrant  Test Site
  High (ft/d)  18.47  " )  Recommendations:
 Infiltration Rate
 Low (ft/d)  13.58  X YBoring EX-5  - Pilot recharge testing is recommended to confirm full-scale basin infiltration rates and identify
 (Constant-Head)       potential site vadose zone storage capacity constraints due to recharge mounding.
 Average (ft/d)  16.0
 Infiltration Rate                    High (ft/d)  16.82  USGS Nested Well
 (Falling-Head)   Low (ft/d)  14.5  ยด  0  400 Feet  (Equestrian Park)                            Figure 8
 Full-Scale Basin Est. Initial Infiltration Rate (ft/d)  8.0                                 City of Yucaipa
 Full-Scale Basin Est. Long-Term Infiltration Rate (ft/d)  4.0                             at California Street

 Yucaipa Sustainable Groundwater Management Agency - January 23, 2019 - Page 52 of 137
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