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can create a significant safety hazard should a heavy rain Site Security
event occur. Also there may be substantial time and costs Because each test site will be in operation for 14 days
required to design and obtain approval for BMPs at each and largely unattended, except for periodic site visits,
site. preventing unauthorized access will be a concern. To
minimize the risk of flood that may occur from vandalism or
Water Supply from equipment failure (e.g. inlet float valves not closing),
The majority of locations have water available through local our design includes a Solenoid operated shutoff valve
located at the hydrant, which is activated through a Wi-Fi
fire hydrants or other means. Initial percolation rates will be connection based on low line pressure or high basin level.
high for most locations which means that sufficient water All instrumentation used for testing will be located in a
supply needs to be available to ensure that testing is not secure NEMA enclosure within the site security fencing.
delayed. In the case, that water supply is limited, reducing
basin area should be considered to avoid delays in reaching
a steady-state percolation. Most sites are in proximity to Permit Compliance
fire hydrants and should water be unavailable or not easily As previously discussed, permits from several agencies
conveyed to the site, a temporary, elevated construction will be required to complete the project. We understand
water tank may be used. We have included costs for that our scope of work does not include assistance
elevated storage tanks as an option in our proposed fee. with permitting. Over the course of testing we will
ensure compliance with applicable permit conditions
Accurately Measuring Percolation Rates and requirements including, run-off, dust control, site
One of the most critical aspects of this testing is obtaining restoration and other permit conditions.
accurate flow measurement, particularly in low flow ranges.
To reliably estimate saturated hydraulic conductivity,
the steady state percolation rates must be accurately
measured. On the high-low fill cycles of these basins, if the
low-flow measurement is inaccurate, due to an oversized or
poor-quality instrument, the percolation capacity of these
sites may be substantially under- or overestimated. In our
approach, we propose a design that uses a separate high-
range and low-range flow meter, consisting of magnetic
flow meters that have a 0.5% full scale accuracy. A switch
between flow meters will be manually made when the flow
rate into the basin flow falls out of acceptable range for
the meter. Water pressure will be regulated back so that
there is not a rapid—and short lived—flow burst, which can
also introduce substantial errors in flow measurement to
otherwise accurate meters.

Real-time, Web-Based Data Collection
We propose collecting data from the testing site using a
Cellular SCADA system, which will upload data to a web-
based interface. Online instrumentation will include;
High-Range and Low-Range Magnetic flow meter, ultrasonic
indicator for basin level, and Inlet Water Pressure to Basin.

Data from field instruments will be collected on a real-
time basis (one-minute averaged data points) from four
instrument locations using a cellular communication link.
A satellite connection is also available in the event that
cellular service is not available. Should water pressure
drop at the site—indicating line failure or potential
vandalism— the system will send an alarm and text alert.
This instrumentation will be housed in a NEMA 4 enclosure
and will be powered by a 24-V power supply with a solar
charger.
This system will enable remote monitoring of testing at
each location, which will minimize the time required at
the site. During the course of testing at a site, data will Data Collection System
be downloaded and checked daily to verify the success of
testing and to minimize lost time in the event that problems The images above illustrate the web-based data collection
arise. An example of the data collection system interface is system that we propose to use on this project. It will enable
provided below. real-time control and monitoring from any Internet connection.

Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 195 of 226 3