Page 193 - _ 180314 Special Yucaipa GSA Packet

 Built‐in telemetry and sensors to provide real‐time
notifications of (a) low‐water pressure from the
water source or (b) exceedances of low‐water and
high‐water level thresholds in the test basin.

 Redundancy of flow meters at the hydrant
connection and on the final discharge piping ensures
that volumes entering the pit are reliably tracked.

All field activities would be conducted to ensure minimal
disturbance to native vegetation and minimize soil erosion
along channel banks and follow site management practices
described in Section 1.9 of the Work Plan.

In order to minimize labor and equipment costs and ensure
an efficient work flow, we propose to implement the
Example: Infiltration Test at Ford Ponds
recommended test sequencing described in Section 3.1 – Santa Clara Valley Water District
Fieldwork Schedule of the Work Plan (use of two infiltration
systems simultaneously at two sites staggered one‐week apart). Costs assume site visits by field
personnel twice a week (once on Mondays during routine site mobilization and demobilization
and once on Thursdays) to monitor the flow control system and record flowmeter readings and
basin water levels.

Examination of the use of three infiltration test systems (versus two systems) indicate that
there would be minimal savings in labor and equipment costs with increased field management
challenges. Accordingly, cost estimates and schedules are presented for an approach using two
infiltration systems.

At the completion of infiltration testing, each test basin would be backfilled with the excavated
material, and the site would be returned to its original, pre‐disturbed grade. It is assumed that
formal compaction and compaction testing is not required.

Task 3 – Draft and Final Reports

Results of the infiltration testing program will be documented in a Draft Report provided to
Valley District for review; comments will be incorporated into a Final Report. The report will
document all key field activities, results, and findings. Tables and charts of collected field data
and calculated instantaneous and average vertical infiltration rates for each test will be
included. The report will provide conclusions on the feasibility of recharging water at each site
based on infiltration test results and lithologic logs of nearby exploratory wells (if applicable).
Suitable locations for siting spreading basins at each site will be described along with
recommendations for next implementation steps. Comments received will be incorporated into
a Final Report, which will be submitted to Valley District. All report files will be submitted in the
latest Adobe Acrobat PDF and Microsoft Word formats.

Proposal – SBVMWD Yucaipa Basin Area 3 TODD GROUNDWATER
Infiltration Testing of Thirteen Sites January 2018
Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 170 of 226