Geosynthetics August/September 2019 - 12
Reviving the Palos Verdes Reservoir
Here, in Part 4, we advance into the
initial filling, disinfection and operational
start-up. Everything involved in this late
phase is connected to the lining and cover
systems, particularly with respect to what
should be done in order to keep the floating cover system operating at optimal level.
Initial fill at Palos Verdes
FIGURE 2 A counter weight housing
system is used for rainwater removal
pump and water level sensors.
The MWD is one of the largest water districts in the world and is responsible for
the Palos Verdes Reservoir. In February,
with the 60-mil (1.5-mm) chlorosulfonated polyethylene (CSPE) geosynthetic
liner, 45-mil (1.1-mm) CSPE floating
cover system and affiliated structural
components installed, MWD opened
the gates and filled the reservoir over a
five-day window.
Although this fill involved the full
200 million gallons the site has been
redesigned to operate with, it was not the
final fill. This phase was designed to manage the disinfection of the reservoir to prepare for filling with finished potable water.
When filling the reservoir, the water
must be carefully released and closely
monitored. The water level must be
brought up slowly, particularly early on,
so the lining system and floating cover,
hatches and mechanical systems are not
overstressed. The geosynthetic cover must
be monitored for how it rises. Personnel
must watch carefully to ensure nothing
catches during this rise and that the large
polyvinyl chloride (PVC) pump housing
system (Figure 2), set in the middle of the
rainwater collection trough (RCT), is kept
stable by the weight and cable system as
they sink in during the fill stage.
Once the water has covered the bottom section and all inlets are fully submerged-a critical elevation level-the
base lining and floating cover systems have
typically reached the stabilization point.
Filling may then advance to full speed.
A chlorine component was utilized
during the first fill at Palos Verdes to
disinfect the lining and floating cover
systems. The reservoir was then left full
for a designated period to accomplish the
disinfection while site personnel tested
the cover, hatches, rain troughs, vents and
pump systems. These tests were used to
verify that, with the facility full, all components were functioning to the project's
design standards.
The project punch list
As the disinfection and testing phase
wrapped up, MWD prepared its punch
list of any open items left to address. The
punch list is an essential standard closing
aspect of work like this, as it stands for a
12
Geosynthetics | August September 2019
Geosynthetics August/September 2019
Table of Contents for the Digital Edition of Geosynthetics August/September 2019
Geosynthetics August/September 2019 - Cover1
Geosynthetics August/September 2019 - Cover2
Geosynthetics August/September 2019 - 1
Geosynthetics August/September 2019 - 2
Geosynthetics August/September 2019 - 3
Geosynthetics August/September 2019 - 4
Geosynthetics August/September 2019 - 5
Geosynthetics August/September 2019 - 6
Geosynthetics August/September 2019 - 7
Geosynthetics August/September 2019 - 8
Geosynthetics August/September 2019 - 9
Geosynthetics August/September 2019 - 10
Geosynthetics August/September 2019 - 11
Geosynthetics August/September 2019 - 12
Geosynthetics August/September 2019 - 13
Geosynthetics August/September 2019 - 14
Geosynthetics August/September 2019 - 15
Geosynthetics August/September 2019 - 16
Geosynthetics August/September 2019 - 17
Geosynthetics August/September 2019 - 18
Geosynthetics August/September 2019 - 19
Geosynthetics August/September 2019 - 20
Geosynthetics August/September 2019 - 21
Geosynthetics August/September 2019 - 22
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Geosynthetics August/September 2019 - 24
Geosynthetics August/September 2019 - 25
Geosynthetics August/September 2019 - 26
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