HomeMy WebLinkAboutPre-design Scoping Workshop with JD Comments1
City of Renton
Well 5A Treatment Improvements Project - WTR-27-3321
Phase 2 - [Treatment Technology Selection I Pre-Design / DOH Project
Report I Preliminary Cost Estimate]
Scoping Workshop - July 17, 2006
Agenda
1. Overall Objectives of Phase 2
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2. Roles and Responsibilities y— Gg^tsT
• HDR - prime, civil/site, electrical, l&C] environmental, permitting
assistance
• K/J - process lead, mechanical, architectural, structural
• Zipper Zeman - geotechnical
• ESM - surveying
• Reid Instruments - l&C programming
3. Lessons Learned from Maplewood
(discuss the good & not so good aspects from Maplewood in the
categories below and how to improve the not so good areas)
Design Development:
General
o "As-builts" are not
n Were "as-builts" accurate to begin with?
n What has changed since the "as-builts" were created?
n Conditions need to be verified in the field not at the desk
o Exisiting items
n What is good enough to reuse?
• How should this be determined?
• Code compliance issues.
n What needs to be replaced or reconfigured?
Treatment process / mechanical
Pressure Relief
n Adequacy
n Preventing water damage
Vessel manway hatch design
Sampling
n Varying liquid levels & pressures
n Accounting for head losses between sample point and
analysis point
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n Time delays between sampling & analyzing
n Getting samples In high velocity flows
• Accounting for Venturl effects
n Getting representative samples
• Adequate mixing prior to sample
• SIdewall vs center of stream
o Analyzers
n Variable flows & pressures
n Non continuous flows
n Adequate / appropriate sensors for process control / safety
o Contactors & Filter Vessels
n Are we losing media at too high a rate?
• Can't tell - sample lines don't work
n Better air / vac valves - clogging by media
o Layout
n Adequate space & clearances for maintenance & testing
n Inclusion of adequate numbers of Isolation valves, unions
and bypasses to allow for removal of components for
maintenance, repair and replacement
o Process Flow Control
n Butterfly valves vs ???
n Sluice gates vs ???
o Features to Include to help troubleshoot system during start-up and
operation
n Flow Indicators
n Pressure Indicators
n Sampling ports
o Work platforms / hoists / etc for to aid operations and maintenance
o Controlling the flow of water from blowoffs, air Inductors, pumps,
etc to drains
Site / civil / earthwork
o Location of burled utilities, etc during design phase
o Adequate / accurate geometry Information and field reference
points to construct Iterns
Architectural / Structural
o Confirm that roofing system specified Is one that matches a design
approved by the roofing manufacturer for warranty
o Provide detailed plans & specs on wording and locations of signage
- not "Install signs where directed by Engineer"
Electrical
o Site
n Determine type and status of power source (e.g., Y vs Delta)
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n Examine / test existing cabling, transformer, switch gear,
breakers, fault protection, etc - physical condition & code
compliance
o Building Power
n Examine / test existing MCC and other components that will
be reused - physical condition & code compliance
p Building Lighting
o Signal
0 Fire Alarm
n Code requirements for sensor locations
o Intrusion Alarm
n MW WTP system is confusing
■o Code interpretation
Engineer - meet with City electrical inspector periodically
during design
Location of electrical engineer
• Local better than distant
l&C design
o The additional "tags" that the Maplewood WTP project added to the
SCADA system increased the time it takes the Bristol-Babcock
telemetry to poll the system.
■ Is the current polling time too long to perform the various
functions being performed - process control, status / alarm
reporting, fire alarming, intrusion alarming?
■ Can we design the Well 5A control system so as to not make
the polling time unacceptably long?
o Control Strategy - Feed Forward vs Feed Back Control Applicability
■ Time delays
• Telemetry system polling delay
• Transit delay (chlorine contact chamber transit; long
chemical feed lines; long sampling lines)
■ Lack of feed back sensors
■ Disturbances / Upsets
■ Wear & tear on valves - seeking
• Limited accuracy of valve motor controllers
• Play in the butterfly valve
• Limited precision to which the valve motors controllers
can be controlled
o Control Strategy - All control from Bristol-Babcock RTU versus
Sub-controllers that communicate with the RTU
■ Advantages and disadvantages
■ Example of sub- control - control contactor / filter vessel flow
control valves using a separate controller
■ Who provides / programs the subcontroller?
o Control Strategy Narrative & Pseudo Code
4
n First version submitted with 30% design review
n Update & submit as design progresses
n Final version
• Complete detailed description including device / valve
/ etc identifiers
• Appendix of complete pseudo-code for the entire
process control-
o Subsections to be modified by equipment
suppliers as necessary to fit their detailed
design and manufacture of system
components
o Match I & 0 Design with Control Strategy and vice versa
n Adequate types and numbers of sensors & analyzers
n Consider limitations of sensors & analyzers
n Consider time delays that will occur
n Consider the limitations of the devices being controlled
l&C programming
o Ensure programmer is available to do programming when needed
n Establish what code will be completed by what point in the
construction phase
n Include the programming schedule in the specs for the start
up plan
o Have programmer be part of all design reviews & meetings
involving the control system, control strategy narrative and
pseudocode
Frequency & level of design reviews /
Permits i
Project approvals
o SERA
n Well 5A project will need much more interaction with the
neighbors than the Maplewood project did
o DON - Project Report
o DON - Bid Documents
Bid Package:
Plans
o Adequately depict existing conditions on site and in existing
building - a copy of 15 year old "as-builts" will not be adequate
o Do not try to cram too much information on one sheet
Specifications
o Address how price Increases / decreases will be handled
n Contractor eats everything or
n Details on method (s) to adjust payments up and down
o Protect City and Consultant from "RFI" abuse
o Make sure references are current \
n The referenced product Is still manufactured and the latest
product description Is used by the designer when selecting
the product to reference
n Use current specifications and standards
o When a product Is referenced and the product has optional features
that the designer wants provided be very specific about what
options are required - If a product number Is called out make sure
all of the required option shred out codes are listed
Construction phase:
Bidding
o Recommend that the bid package Includes page;s that highlight
Important considerations "burled" In the plans & specs - cross
reference to the plans and specs
n "No substitutes allowed"
n System / Unit responsibilities
n Warranties that are different from the Industry standards
Resident engineer requirements
Regularly scheduled construction meetings
Substitution requests
Submlttals reviews
o If pseudocode Is required from the manufacturer, then the
pseudocode must be submitted and approved along with the
hardware - no separate approval of the hardware prior to approval
of the pseudocode
Plant visits by engineer
o Inspect & observe testing of Items prior to shipping
n Switch panels
n MCCs ,
n Control panels
n Filter / contactor media vessels
RFl's
o Protect City and Consultant from "RFI" abuse
• Change orders V
• On-slte reviews of work and equipment by the Engineer
• Punch list
• Substantial completion
• O&M manuals
• Record drawings
Startup phase:
• Roles and responsibilities
• Training
o Integrate contractor supplied training with Phase I of start-up
o Integrate consultant supplied in-plant training with Phase II of start
up
o City to obtain maintenance contract with analyzer supplier (assume
Hach) that will include start-up and training services.
• Startup plan
o Recommend that the draft start-up plan be written by the consuitant
and included in the specs
n Contractor will be required to finalize the plan by applying
specific dates; allowed to modify plan - submit for approval
o Since the I & C programming is provided by someone other than
the construction contractor, the startup should consist of the
following phases
n Phase I - Contractor demonstrates that individual
components work and if applicable, are correctly calibrated
and SCADA signals are successfully being transmitted. This
will involve the City I & C Programmer and the contractor's
control system integrator. To test sqmeone these
components (e.g., flow meters, metering pumps) the plant
will be operated in .manual mode. This phase cannot start
on the contract schedule until all the work on this system is
complete and other work that would interfere with this phase
is complete (e.g., paint fumes). Duration: 4 weeks?
7
n Phase II - City, working with the I & 0 Programmer, tests
each subsystem and then the entire system. During this
time the contractor will be on call to address / fix problems
identified by the City, including execution of change orders
addressing design deficiencies identified. During this phase
the analyzer tech rep. This phase cannot start on the
contract schedule until Phase I is completed. Duration: 6
weeks? Substantial completion occurs at the end of Phase
II provided that all problems that were identified are fixed/
change orders are complete.
I&C programming completion and testing
Moving Forward
Overall project schedule objectives
o Phase 2 - treatment technology selection, pre-design, DOH Project
Report & cost estimate - December 2006
o PWTF Pre-construction Loan Application - would like to submit by
November 5, 2006; need good cost estimate for design phase
o Phase 3 - Design, Plan, Specs (Bid Package), updated cost
estimate - Begin January 2007, perhaps sooner
o PWTF Construction Loan Application - due late April / early May
2007
o Phase 4 - Construction - Start May 2008 to coincide with PWTF
Construction Loan [could start earlier if we don't make the cut. Will
know if we make the list in fall of 2007]
City's funding constraints
o 2006 -$350K budgeted [$100K used for Phase 1]
o Programmed but not yet budgeted (subject to change):
n 2007 $2.0M
n 2008-$1.9M
n Need input for 2007 budget submission by end of August
2006
Scoping and contracting (phasing of)
Completion of pilot testing report and recommended treatment process
Schedule for completing pre-design and Project Report for DOH