HomeMy WebLinkAboutItem 5 PPP 04-04-18 Operations Committee - P1-105 PDSA Contingency Increase AT
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Headworks RehabilitationandExpansion •
•
Project No. PI-105
.. perations
�. • �o JN�� S A PI 1, Troy
Committee
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PDSA Increase for Gate Assessment
April 4, 2018 �Fc''ac THE
Headworks Facilities atPlant 1
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$241M construction
no F` cost; $25M District
5-0000 15-0000
® , costs;
LAirE(JA0005 8 $11M Consultant costs
MHP0005.0U' ,O ®NHP0010-0"
SAR"5-0t%+ "O SAN00i0.0000 • 6+ years construction
SAM0005-0r' 0 ,.
�sar0'Sooa duration
ar= Complex sequencing
.®BKRO 05-0000
constraints
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Significant resources
/ throughout
construction
Gate AssessmReduces Risk
• Gates are corroded and
t
unreliable
• Costly construction Y_=
impacts if gates are not
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performing
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•
Schedule delays
• Standby costs
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• Extended overhead costs `
• Assessment confirms - z -
scope of work for
replacement
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Isolation is Critical to Construction Access
• Major shutdowns and
flow diversions
• Reliable gate seal to
maintain facilities
dewatered for
confined space entry -
ti�rs'ar. �
• Work delay could
extend costly bypass r
pumping _
($30,000/day) v. ,7>ri
711,
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FXPANSION
Gate
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Replacements
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STATION
require
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_ , , _ _ SCREEN ��
gatesIMP ROOM.
are critical 4
* Major shutdowns
required including
complete shutdown
* Confined space entry 5
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preparation _ __ . -
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Problem With Not Assessing Gates
• Increased risk of construction
change orders
• Increased operational risk of
gate failure
• Impact to critical path work
• Several critical path items
require complete isolation of
work area
• Some work can only be
performed during dry-weather
months
Benefits to PerformingWork by
Consultant
• Contractor is required for
FOR JOINT BUILD OUT, SEE SK-7 EXIST JOINT FILLER
assessment1/2" DIA TYPE 316 SST (OAKUM GROUT PACK)
EXPANSION ANCHOR BY FM SIKADUR 31
STAINLESS, LLS W/ 3" MIN
• Confined space entry support EMBEDMENT SIKADUR COMBIFLEX
SG SYSTEM
COMBIFLEX CONCRETE WALL
• SIKADUR 31 SIKADUR 31
In-situ repairs and maintenance
3/8" T TYPE EXIST SANCON
• Assessment should be 316 SST 1" 1" i 1/4 1" COATING WHERE
OCURES (TYP)
1 1/2" 3 1/2" 1 1/2-
performed during design-phase 9" MIN
• Expertise of consulting engineer DETAILATWALLS �K3
r_ M1001
• Develop inspection plan in
conjunction with confined space
entry plan
• Rehabilitation detailed in final
design
Gate Assessment DuringDry-Weather2018
Season J
Keeps Project on Schedule
Gate Gate
Assessment Assessment
Final Design Start Completion Final Design Advertise Construction
Start Completion for Bids NTP
Wet Weather J� Dry Weather Dry Weather 1Wet Weather J�
J
2018 2019 2020
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Recommended Action
• Approve a contingency increase of $2 , 103, 104
( 12% ) to the Professional Design Services
Agreement with Carollo Engineers for the
Headworks Rehabilitation and Expansion at Plant
No . 1 , Project No. P1 - 105, for a total contingency
amount of $3 ,856, 000 (22%)
J`v $ANTAT/O
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AT
/f
V
AP
, . • -fit ` �. c� .,
Headworks RehabilitationandExpansion •
•
Project No. PI-105
.. perations
�. • �o JN�� S A PI 1, Troy
Committee
Q ?
o �
PDSA Increase for Gate Assessment
April 4, 2018 �Fc''ac THE