Page 220 - _ 180314 Special Yucaipa GSA Packet

Project Needs be made either by hand or using a powered trencher to
accommodate the skirt.
We have carefully considered the work plan provided in With this alternative, each container would have an
the RFP, past data, and our experience at the site and with infiltration footprint of approximately 280 square feet (36
other projects. In providing our proposal we have identified ft x 8 ft). The online instrumentation, cellular SCADA, and
several key issues that are discussed below. Additionally we all water inlet controls to the basin would be mounted in
have prepared and provided cost estimates for two options. the container, and the container itself would pond water
The first closely follows the work plan presented in the above the test area. Water would be supplied from the
RFP,and the second provides an option for a containerized hydrant to a connection in the side of the container. Up
infiltration basin that can potentially reduce costs, to three containers could be set at a site providing 840
streamline project permitting, and provide more accurate sq. ft of percolation area—nearly the size of a 30 x 30 ft.
data than a 30’ by 30’ infiltration basin.
pit. If multiple containers are used at a site, containers
could be spaced at any distance apart to obtain a more
Containerized Infiltration Basins: representative estimate of percolation rates, particularly
Alternative to Excavated Pits in sites with varying conditions. This approach has the
advantage of:
We have carefully considered the challenges that excavating
13, 30 x30 ft temporary pits poses on site security, 1. A lower overall project cost
permitting and the overall logistics of your project. In 2. Potentially more representative data at each
our costs, we have included an alternative line item for a percolation site using multiple basins spaced apart
containerized infiltrometer in lieu of using excavated pits 3. Potentially more streamlined with respect to obtaining
for determining infiltration rates. With this approach, a 40 and complying with all permits needed for the project,
ft x 8 ft shipping container would be modified and used and
as a stand-alone infiltration basin (See inset diagram). 4. Lower risk of vandalism
The bottom would be removed from the container, and
a continuous skirt would be welded around the base Stockpile Soil Permitting and Safety
of the container protruding down approximately 18 in.
The container would be set directly over the test site, There is a lot of uncertainty surrounding the needed
which would eliminate the need for excavation. The BMPs for each site and associated public safety concerns.
container would be set at each site using either a crane Specifically, placing unconsolidated soil either around
or large forklift, and a 4 in. by 18 in. deep trench would the infiltration pond, or above the storm channel banks

Alternate Approach

The image above illustrates an optional approach that if utilized, could reduce permitting, lower construction costs, reduce the risk
of vandalism, and potentially provide more representative data. Additionally, the system can be reused and easily transported to
additional test sites.

Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 194 of 226 2