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mobilization. Sites will be prioritized and a sequence of testing will be finalized based on site
prioritization by Valley District, intra‐site proximity, and source water type and availability. To
consolidate equipment requirements and minimize rental costs, sites requiring a water tank
should be grouped and conducted at the end of the field program.

Task 1.3. Construct and Test Manifold and Basin Tree Systems

Prior to formal field mobilization, DRE will construct the automated flow control system
described in Scope of Services and Section 1.6 and shown on Figure 3 of the Work Plan
(including the manifold and basin tree and associated valves and switches) and test the
equipment on a water hydrant identified as water source for infiltration testing. This will allow
for modifications to be made prior to field mobilization to ensure the system provides the
automated flow and water level control and alert functions as specified in the Work Plan.

Task 2 – Perform Infiltration Testing at Thirteen Sites
As required in the Work Plan, we will provide all services and equipment necessary to complete
proposed infiltration testing at each of the thirteen sites, following procedures described in the
infiltration test methodology, site security and fencing, and traffic control and signage sections
of the Work Plan (Sections 1.2 through 1.4) and summarized in the Scope of Services. Costs
assume excavation of a 30‐foot x 30‐foot x
5‐foot deep test basin with approximate 1:1
vertical‐to‐horizontal slope, management of
soils to ensure compliance with SBCFCD and
other regulatory agency requirements, and
installation of all test equipment and site
monitoring components to ensure reliable
collection of critical field data. Site security
fencing and traffic ramps and
appropriate traffic control signage will be Example: Infiltration Test in Alto Subarea, Mojave Water Agency
(manual flow control and water level monitoring)
provided to ensure public safety at each
site.

The water conveyance and flow control system designed by Todd Groundwater and DRE
described in Section 1.6 and illustrated on Figure 3 of the Work Plan would be installed at each
site. As described in the Work Plan, the proposed system provides the following operational
advantages:

 Automatically control of flow rates with three manifolds and float valves to provide a
high range of discharge rates to match variable infiltration rates during testing and from
site‐to‐site.

 The incorporation of a pressure regulator setting and hand valves to accommodate
variable pressure from different water sources.

Proposal – SBVMWD Yucaipa Basin Area 2 TODD GROUNDWATER
Infiltration Testing of Thirteen Sites January 2018
Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 169 of 226