HomeMy WebLinkAbout2010/08/10 Additional Information
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(llY OF
(HULA VISTA
Department of Public Works
File: 0735-l0-TF-355
DATE:
August 6, 20 I 0
TO:
The Honorable Mayor and City Council
FROM:
Jim Sandoval, City Manage ~
Scott Tulloch, Assistant City 1 anager 7 4:
R. A. Hopkins, D.. '\tor of Public WorkN!J!l
lraesema Quila a .,!\'ssistant Director of Engineering
VIA:
SUBJI,CT:
Tcmporary Road Closure of Bonita Road Undercrossing Associated with the
Interstate 805 Freeway Bridgedeck Widening and Traffic Enhancement
Improvements tentatively scheduled for 9:00 P.M. Friday, August 20, 2010 through
5:00 A.M. Monday, August 23,2010.
On August 5,20 I 0, the State of Califomia Oepmiment of Transportation (Caltrans) submitted a proposal
trom Skanska USA Civil West, a contractor hired by Caltrans, who has submitted traffic control and
detour plans requestll1g the temporary closure of Bonita Road trom the southbound ramps to the
northbound ramps (Bonita Road undererossing area) for the purpose of lowering the newly constructed
bridge seelion to its ultimate resting and operating position atop the support structures constructed
separately under the existing bridge section. The street elosure would occur in one continuous phase, to
begin at 9:00 P.M. Friday, August 20, 201 0 and to remain completely closed to through traffic on Bonita
Road until no later than 5:00 A.M. Monday, August 23,2010. During this temporary closure period, the
contractor will work around the clock to remove the falsework currently supporting this massive
concrete structure, and using an intricate system of hydraulic jacks, lower this concrete structure onto its
ultimate supports.
While this jacking operation IS in progress to lower this bridge section, there will be a network of
interconnccted jacks, control mechanisms and hydraulic lines set continuously irom one end of the
bridge to the other. A redundant backup system of hydraulics will also be provided in the event of an
equipment failure. In addition to the equipment and manpower necessary to complete this proccss, there
is an unknown, although unexpected, risk of a failure in the concrctc structure itself or the hydraulic
equipment that would pose a significant risk to anyone from the public that would be in the area of
Bonita Road undcr the bridge should this occur. The contractor has detailed the potential risks and
benefits to conducting this operation under a continuous road closure condition, and staff has reviewed
this proposal and concurs with the contractor's request and the concerns expressed in this submittal. A
copy of this risk to benefits request for a continuous road closure is attached to this repOli.
The exact time required for completion of this operation is expected to be within the time constraints of
this requested closure period. While the request for closure I' Tom the contractor is for a 58-hour period,
Caltrans and City staff have concurred that the work can be completed within the period from 9:00 P.M.
on Friday, August 20,2010 through 5:00 A.M. on Monday, August 23, 2010. The road will be reopened
to normal traffic as soon as the work is completed and they are sure that any risk to the public has been
negated. Should this proposal be rejected, the alternative is for 2 weeks, consisting of 10 nights, of
-'1'"9"
The Honorable Mayor and Council
August 6, 2010
Page 2
complete night-time only closurcs to completc the same work that can bc accomplishcd within this 56-
hour period. Staff considers this one wcckcnd proposal as necessary to allow for the maximum of
protection for the public, the contractor and the bridge structure itself with the minimum amount of
disruption and inconvcnicnce to the public.
Signs will be erected notifying the public of the upcoming closures a minimum of two days in advance
of closing of the road. Residents and businesses of the affected area will in this way be given 48 hours
notice prim' to any closure of the road and the associated work to arrange for altemate routes and
schedules that they may fecI are neccssary during this weckend closure. Eastbound Bonita Road traffic
will be detoured south to East H Street. Westbound Bonita Road traffic will be detoured north to
Sweetwater Road (see attached detour map). Caltrans Public Information Office will be handling the
media contact for the project.
Chula Vista Transit will be minimally affected by this road closure. The 705 Route bus on this transit
route will operatc on their normal schedule until the closure at 9:00 P.M. At that time there are only two
bus runs left, to and !i'om Plaza Bonita, and these last two runs will be detoured via Sweetwater Road.
Since these arc the last two late night bus runs, it is anticipated that there will be a very minimal
disruption of schedule or inconvenience to ridership for Chula Vista TranSit and their patrons. All
emergency services will be adequatcly noticcd and will need to make accommodations to handle
emergcncies in the area during the closurc period.
Chula Vista Fire Department and Chub Vista Police Depaliment have been consulted and thcir
respective comments have been discussed with Caltrans staff. The Califomia Highway Patrol will havc
officers on-site to assist with any traffic control needs.
The Traffic Engineering Section has reviewed and conceptually approved the attached traffic control,
closurc and dctour plan.
The purpose of this memorandum is to advisc the City Council of said closures in accordance with
Council Policy No. 576-15, which rcquires that Council be notified in advance of a request to close a
street for major constmction work.
If Council has no objections to the proposed street closures, staff will procecd with the closures
described shown above.
Attachments: Interstate 805 Southbound Auxiliary Lane Project Fact Sheet
Clarification to Rcqul:st for Extended Closure ofI3onita Road Submitted by Skanska USA Civil West
Chula Vista Transit Route 705 Map and Schedule Information
Ddour Map
cc: David Bejarano, Chief of Police
David Hanneman, Fire Chief
Malt Little, Assistant Director of Public Works
Frank Rivera, Principal Civil Engineer/Transportation Services/Traffic Engineering
Silvester Evetovich, Principal Civil Engineer/Construction Inspections
Andy Trujillo, Transit Manager
Police and Fire Dispatch
Diane Howell, Office of Communications
Amy Partosan, Engineering Admin Analyst II
Lindsey Walters, Public Works Specialist
J :\Engincer\AGENDA \Inlormation Items\Road Closurcs\BonitaRoad@I-S05 Road Closure.dmw.doc
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CALIFORNIA DEPARTMENT OF TRANSPORTATION
The Project
The California Department ofTransportation (Caltrans)
will construct two southbound auxiliary lanes on Inter-
state 805 between State Route 54 and Bonita Road. The
project will also widen the Bonita Road undercrossing
and add new ramp meters at Sweetwater Road, Bonita
Road and the connector from westbound SR-s4 to
southbound I-80S.
The Need
Motorists experience significant congestion in the area
during the evening peak commute.
Traffic entering 1-805 southbound from the east and
westbound SR-s4 direct connectors and from Sweetwa-
ter Road creates merging conflicts with motorists
moving to the outside lanes to exit at Bonita Road. The
merging and weaving further adds to the congestion.
This project will reduce current and future traffic conges-
tion on 1-805 in the area during the peak traffic period. It
will also allow for easier entry and exit access between
the SR-s4 interchange and Bonita Road.
Chula
Vista
I
Imperiall
Beach \
UNm.DSl"~
-M'DJCO
Jobs
Construction of the 1-805 Southbound Auxiliary Lanes
Project will generate jobs for the San Diego Region and
California.
Partnership
The project is developed through a partnership with the
California Department ofTransportation (Caltrans) and
the Federal Highway Administration (FHWA).
Project Status
Construction started in October 2009.
Project Costs
The project cost is $14 million, including $9 million
provided by the American Recovery and Reinvestment
Act (ARRA) and $5 million from the State Highway Opera-
tion and Protection Program.
Project Schedule
Start Construction: October 2009
Project Completion: Fall 2010
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SI<ANS
USA
Civil
Skanska USA Civil West
California District Inc.
9543 Heinrich Hertz Drive, Suite 4
San Diego, CA 92154
Phone 619-671-7709
Fax 619-671-7873
Web www.skanska.com
July 21, 2010
State of California, Department ofTransportatiol1
District 11 Construction Ficld Officc
817 Swcetwater Rd
Spring VaHey, California 91977
09-5002-000-0188
Reference:
Caltrans Contract No. 11-081644, Skanska Job #09-5002
Route 805/54 Separation
Subject:
Clarifications to Requcst for an Extended Closure of Bonita Road
Dear Mr. Alsheikh,
As requested Skanska is clarifying and expanding on the benefits of an extended closure for
the lowcring of the Bonita DC.
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1. Greatly enhanced pnblic safety:
Safety is always Skanska's primary objective and an important aspect of safety is
recognizing when an activity is significantly different from a typical operation.
Skanska believes that thc lowcring of a 300' three span pre-stressed cast in place
structure is an operation that is so unique that the additional caution is warranted.
During typical bridge construction falscwork is erected to support all the
construction loads. The load on the falsework is gradually added as tlrst the
formwork is constructed, and then 70% of the bridge reinforcing is added, followed
by additional form work. The most critical pcriod of loading, when most falsework
failures OCCllr, is during the placement of the soffit and stems concrete. Once the
bridge deck is in place and the bridge is stressed the falsework is effectively
unloaded and can bc lowered at any point thereafter.
In the case of the Bonita UC the completed structure is supported by the falsework
until the load is transferred to the lowering system. This load transfer is a critical
step in the sequence. Unlike the falsework, 100% of the load will be applied to the
lowering system in a short period of time. The benefits of slowly loading the system
and having the ability to monitor the integrity ofihe system, as lS clone with
falsework, will not be afforded. However there is still an alternative plan if the
loadings do 110t match those calculated, undesired denections or settlements arc
encountered or any part of the lowering system fails. The bridge can be lowered
back outo the falsework until the problem is rectified. Once the load transfer is
complete the falsework will bc removed so that the structure can be lowered into
position,
Skanska believes that the three safest conditions or phases of this operation are
when the structure is 1000/0 supported by the falsework, When thejacking system is
fully engaged, upon load transfer, and all loadings, settlements and deflections are
accounted for. When the structure is completely lowered and is in its ultimate
position.
Any position other than those listed above carries an increased risk proportional to
... the lerlgtll of.tilll~thatthe bridg"isnot in one of'lboveyositiollS. The actual activity
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of lowering the bridge will consists of using a large system of thirty interconnected
jacks with a total stroke of 6" to lower the bridge in 1/4" inCft;Il1ents. Once the bridge
has been lowered by a stroke of the jacks (6") the bridge will be lowered onto a
redundant build up adjacent (0 the jacks, then the jacks will be repositioned for
another lowering. This process will be repeated until the bridge is in its ultimate
position, approximately 10 iterations. One of the unknowns in the process is how
long will it take to lower the bridge through one iteration, Skailska is assuming 1 per
night until the capabilities of both the system and the procedure can be reassessed.
The period between shifts, when the jacking system is disengaged, and the
crews are home resting is when Skrlllska has the greatest concern for public
safety. If there is any undesired settlement, rotation, buckling, material failure or
shifting in the redundant system it would take a significant amount of time to
mobilize forces to close the surface street and engage the jacking system to stabilize
the discrepancy. Until the above actions are taken the public would have access
beneath the bridge and would be in considerable danger.
Both the jacking and redundant systems have a factor of safety against design
loads but the unknowns ano the unprecedented nature of this evolution are a cause
for concern. Combined with the notion that if something were to go wrong the
likelihood of personal injury is very high. In the interest of maximizing public safety
Skanslm recommends that the lowering operation continues as a continuous
evolution from the fully raised position to fully lowered position without allowing
the public under the structure while in a transit phase.
2. Decreased inconvenience to public traffic.
Skanska's is currently planning on the lowering operation taking ten consecutive
nights. With an extended closure the ten nights offull closures would be replaced
with a single weekend closure. Additionally even though the request is for the entire
weekend there is likelihood that the entire weekend would not be needed. Ifthis
were the case the road would be opened as soon a practicable.
3. Greater chance to maintain higher tolerance and structural integrity of bridge during
lowering.
For the same reasons listed within the public safety bullet Skanska feels that
greatcr control can be maintained through a continuous operation. While the
iterative process of placing the structure onto buildup and back onto the jacks is
inevitable long durations with the structure on the buildup in a transit condition
should be avoided. Settlements and deflections which occur off shift will be
difficult to accOllnt for and correct. There is a possibility that excessive stress
could be introduced into the structure during the off shift period which may
calise permanent damage.
4. Decreased chance of catastrophic failure during lowering.
Duo to the nature of the bridge lowering there will be over 90 hydraulic and
sensur cables running throughout the construction area. To begin rmd end the
lowering by daily shift will introduce additional unforeseen hazards not previously
cited e.g. hydraulic bleed-off, human tampering, theft and possible unforeseen
hazards left uncovered from the previous shift. Any ofthese conditions wonld
,....,..
SKANSKA ~t~1
expose the system to a critical failure, which as cited above would exposes both the
general public, Caltrans and Sknl1ska personnel to grave injury.
5. Reriuccd probability for an error in jacking system setup.
During shift startup Skanska anticipates a certain degree of system setup which
will include connecting numerous control cables and hydraulic lines tu two
independent control systems. During these procedures which will occur at night
there is the possibility thal cables could becume crossed, miscol1l1ccted or over
looked. If any of these mistakes arc made the overall effect would range from a delay
in beginning the night's operation to lowering the bridge based on erroneoLls
information.
6. Recover days on project schedule.
As of the last CPM Update the project was j.8 days behind schedule. Obviuusly
performing a critical path activity in a shorter than planned duration would befit the
project.
7. Increased efticiency of lowering operation.
Skanska is plmming all a 1 Yz hour set up and Ih hour to seclIre the system with a
1h. clIshion to reopen to traffic. Effectively leaving a 5 Y; hour window to pertann the
work. Assuming a 1" per hour lowering rate ten shifts and 80 shift hours would be
required. Under a continuous closure with tIle same lowering rate the bridge would
be lowered in 58 hours. This is 28% fewer shift hours worked for the same activity.
Efficiency could also be gained under a continuous closure given the repetitive
nature of the activity. It is likely that the crews would become more efficient over
time if each crew was able to participate in more than one iteration of selting and
resetting the jacks and plates. Additionally at crew change over there would be a
face to face turn over with double crews on site at turn over an accurate pass down
of lessons learned and system status conki conveyed. This would not only increase
the efficiency but would add an element of safety which is difficult to quantify. It
may be a cliche but communication at all levels will play an important part in this
evolution being successful and face to face turn over's are the best way to achieve
tight communication lines.
8. Decreased cost for inspection and COZEEP.
Skallska hopes that the above clarifications are helpful in securing an extended closure
period. Skanska's project and executive staff will be available anytime to meet and disclIss
allY of the poinls brought forward.
[fthere are any questions related to this matter, please call me at (951) 232-6954.
ACivil
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11:59
12:44p
1:29
2:14
2:59
3:44
4::2.9
5:14
5:59
6:44
7:2~
.;. ',~: .,'l..
Route 705 does not operate on Sunday. Alternative Sunday service may include Routes 929 or 961. / Ruta 705 no opera los domingos. Servicio alternativo de domingo puede inc/uir las rutas 929 0 961.
10:35
10:39
10:43
11:35
11:39
11:43
:43
5;17p
5:47
6:16
~:~.6
7:31
8:1.6,.
9:11
10:11
5:35p
5:39p
5:43p
ront / ESt. T
rF.l @
ESt. &
3rdAve.
(Downtown
ChulaVista)
8:09a
8:54
9:39
10:~4
11:09
11:54
12:39p
1:24
2:09
2:54
3:39
4:24.
5:09
5:54
6:39
Banit
Bonita
Glen Rd.
8:05a
8:50
9:35
10:?0
11,05
11:50
12:35p
1:~0
2:05
2:50
3:35
~:~q
:05
7:59il
8:44
9:29
!9:.14
10:59
11:44
12:29p
1:1.4
1:59
2:44
3:29
,
4:59
5:44
6:29
7:14
7:22
*A Saturday or SundilY schedule wi] be operated on most holid<lYs and observed holidilYs, including NeY/Year's Day, Pre~ dents' Day, Memorial Day, Independence Day, Labor Day. Thanksgiving and Christmas. For holiday s"rvici! detilils, visit www.sdmts,comorcaIlS11.
'S" opcrara con hordrio de sabado 0 domingo durante la mayor!il d., los di"s fllstivos y los dias de asueto a guardar. Los dias festivos induyen Ano Nuevo, Presidents' Day, Memorial Day, Dia de la Independencia (EEU.U.;, Labor Day, Dla oeAccion de Grilcias y Na\idad.
Pard det;]fles sabre el sel"Acio ell dfas feslivos, visite \Vww.sdmts,cam a Jlame aI51'.
6:34
6:37
6:40
I
E St. Trolley.. Westfield Plaza Bonita.. Southwestern Colle<1e
c @ @ 0 @ @
Bon'ta Rd. Wrl~~~ld Bv~:f~:~i.& atrid~&kes R~:~ ~~~~:a
Bom onita (Kaiser Bonita Rd. Vista Middle
Glen Rd. Clinic) (BonitaCtr.) School
7:4Ba 7:54a
8:33 8:39
9:18 9:24
10:93 1,0:09
10:43 10:54
11:33 11:39
12:18p 12:24p
1:0~. 1:99
1:48 1;54
2:33 2:39
3:18 3:24
4:9.3
ESt.&
3rdAve.
(Downtown
Chl.llaVista)
7:44a
8:29
9:14
9.:?9
10:44
11:29
12:14p
1~:?~
1:44
2:29
3:14
~:59
4:44
5:29
6:14
:33
6:18
7:03
4:54
5:39
6:24
7:09
Route 705 No longer Operates on Saturday
8:07"
8:52
9:37
10:22
11:07
11:52
12:37p
1:22
2:07
2:52
3:37
. ~.:~~
5:07
5:52
6:35
7:20
Bio:7
..,1'<
. ,0,-. "
. '0 0 . .
0.] .-,
tbIf:rcuas.
Road
CLOSURE
DETOUR
.~
II
Not To Scale
To Bonita Road East from I-80S South
To Bonita Road West from I-80S North ,.
-","p
--~-----~-~--------- -----~ -