INFO SHEET WEST COAST BASIN SEAWATER BARRIER TELEMETRY PROJECT

INFO SHEET
WEST COAST BASIN SEAWATER BARRIER
TELEMETRY PROJECT
Project Summary
The County of Los Angeles Department of Public Works (LACDPW) proposes to install
a telemetry system along the existing West Coast Basin Barrier Project (WCBBP).
Once installed, the telemetry system will collect more accurate injection rate and
groundwater level information, and transmit the data directly to our headquarters
building. The telemetry system will allow barrier engineers to see in real time how
changes in injection rates impact groundwater levels and will result in a more efficient
operation of the WCBBP.
Within the City of Manhattan Beach, the plans call for a majority of the telemetry system
to be installed along the existing WCBBP water supply line, which is located within the
greenway between Elm Avenue and Boundary Place. In addition, a small portion of the
system will be installed along Valley Boulevard and Oak Street.
Background
Since 1951, the Los Angeles County Flood Control District, now part of LACDPW, has
operated the WCBBP by injecting fresh water into the underlying aquifers to prevent
seawater from contaminating this valuable drinking water source. Data needed for the
operation of the WCBBP has traditionally been collected manually by visiting each
injection and observation well location.
However, technological advances in
instrumentation used to measure flow and pressure have provided improved methods to
operate the WCBBP. By installing these electronic devices in existing injection and
observation wells, the overall operation of the WCBBP will become more efficient and
effective.
Project Design
The telemetry system will stretch 9 miles, from Pacific Coast Highway
in the City of Torrance, to El Segundo Boulevard in the City of El Segundo
(see Attachment A). It will collect information from 98 injection wells and 65 observation
wells located in the Cities of Torrance, Redondo Beach, Hermosa Beach, Manhattan
Beach, and El Segundo. The telemetry system will be continuous from one end of the
project to the other and will provide A/C power to each injection well location for future
remote control capability of seawater barrier operations.
Within the City of Manhattan Beach, the system will stretch 2.2 miles and collect
information from 10 injection wells and 7 observation wells (see Attachment B).
LACDPW design engineers met multiple times with representatives from the City of
Manhattan Beach to come up with a design to minimize impacts to the greenway and
still allow the installation of the infrastructure necessary for the telemetry system. For
example, the original design called for 9 above ground monitoring control units (MCUs)
INFO SHEET
to be installed at various injection wells located in the greenway. However, at the
request of Manhattan Beach representatives, this number was reduced to a minimum
number of 3 MCUs. In addition, the project specifications were modified to include a
requirement to maintain pedestrian access to the greenway walking path at all times
during construction, and require the MCUs to blend in with the existing environment.
Estimated Project Duration
It is estimated that construction activities will last approximately two months.
Construction will start after a project update is presented to the Manhattan Beach City
Council and once the construction contract is awarded (anticipated start in April 2009).
Construction Activities
Construction activities will include the following:
1. Excavate a trench 6 inches wide by 36 inches deep to install two 2-inch PVC
conduits along the alignment. One conduit will be used for installing electrical
equipment to transmit the telemetry signal, while the other conduit will be used to
install wiring to provide A/C power to the injection wells.
Installation of conduits within the greenway will be accomplished by temporally
removing the existing wood chips over the trench area, trenching, and installing
the conduits. The wood chips will then be placed over the trench area to restore
the site to its original condition.
For street crossings, PVC conduits will be directionally drilled below the existing
pavement rather than trenching across the street. This will minimize the impact
of construction activities on local traffic.
2. Install pull boxes along the alignment at approximately 300-foot intervals. The
pull boxes will allow the electrical wiring and equipment to be installed and
connected from one well to the next within the PVC conduits.
3. Retrofit observation wells with new vaults to accommodate the electronic wiring
and equipment. When the observation wells were originally installed in the
1960s and 1970s, they were done so without the benefit of knowing the future
advances in electronic monitoring equipment.
4. Install small MCU cabinets at three injection well locations. Originally, 9 MCU
cabinets were proposed for the telemetry system. However, as noted above,
after meeting with representatives from Manhattan Beach, the number of MCU
cabinets was reduced to three.
INFO SHEET
The locations of the three MCU cabinets were carefully selected to minimize any
visual impact on the greenway and will be installed in the following locations: on
the sidewalk along Oak Street located 600 feet away from the greenway near
injection well 5R; inside the existing chain-link fenced area that is used for well
maintenance near the intersection of 12th Street and Ardmore Avenue near
injection well 6B; and on the existing paved area used for well maintenance
along the Valley Drive between 1st and Francisco Streets near injection well 6I2
(see Attachment C).
Please note, this is the absolute minimum number of MCU cabinets that can be
used and still maintain a functional telemetry system.
Benefits to City of Manhattan Beach
The City of Manhattan Beach and its residents will receive the following benefits as a
result of the installation of the telemetry system:
1. Increased protection of the City’s groundwater resources. The telemetry system
will allow barrier engineers to monitor seawater intrusion more closely.
2. Reduced traffic and automobile emissions from LACDPW vehicles. The need to
collect manual measurements will be significantly reduced as sensors will relay
information directly to the LACDPW headquarters building.
3. Reduced visual impact to greenway by LACDPW activities. The telemetry
system will result in a significant reduction in the number of trips LACDPW
personnel will need to make to the injection and observation wells.
4. Possible reduction in amount of water injected. The telemetry system will allow
barrier engineers to operate in a more efficient manner.
5. Installation of a conduit for a fiber optic cable. During its regular meeting on
November 19, 2002, the Manhattan Beach City Council approved the installation
of the WCBBP telemetry system with the condition that LACDPW would
reimburse the City for the cost of materials associated with installing a four-inch
conduit for the City’s future use. The conduit has already been installed and
LACDPW has reimbursed Manhattan Beach as agreed.
P:\wrd\Ops\Seawater Barriers\WCBBP\Telemetry Phase 1\2008_08_04_infosheet.doc
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part from the Thomas Bro. Maps digital database.
Thismap is copyrighted, and reproduced with
permission granted by Thomas Bros. Maps. All
rights reserved.
AUG 11 2008 , 04:24:25 EBATMAN
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WCBBP Injection Well Location
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Data contained in this map is produced in whole or
part from the Thomas Bro. Maps digital database.
Thismap is copyrighted, and reproduced with
permission granted by Thomas Bros. Maps. All
rights reserved.
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39T H
ST
38T H
H
PL
38T
S
N
A
EC R
S
O
00
2
R
36TH
34TH
PARK
B
ST
CRE
ST
ST
ST
AV
2300
HA W A
ST
ALA
SKA
CHA
PMA
NW
Y
UP
600
RR
D WY
ALLIE
HUG HES
N
500
SEP
West Coast Basin Barrier Project
Telemetry System Conduit Alignment
MCU CABINET LOCATION
INJECTION WELL 5R
(Along Oak Street 600 ft from Greenway)
BEFORE
AFTER
ATTACHMENT C
1 OF 3
MCU CABINET LOCATION
INJECTION WELL 6B
(Inside existing chain-link fence near intersection of 12th Street and Ardmore Avenue)
BEFORE
AFTER
ATTACHMENT C
2 OF 3
MCU CABINET LOCATION
INJECTION WELL 6I2
(On existing paved area adjacent to Valley Boulevard between 1st Street and Francisco Street)
BEFORE
AFTER
ATTACHMENT C
3 OF 3