HomeMy WebLinkAboutJC Constructors, Inc. WRRF Liquid Stream Capacity ExpansionIAN
CITY OF MERIDIAN
33 EAST BROADWAY
MERIDIAN, ID 83642
CHANGE ORDER
CHANGE ORDER NO.10
PROJECT NO.10601.D
CHANGE ORDER DATE:12t18t2018
EFFECTIVE DATE:
CONTRACTOR:JC Constructors lnc.
PROJECT: WRRF Liquid Stream Capacity Expansion
The Contractor is hereby directed to make the following changes from the Contract Documents and Plans.
Description of additional work: (attach additional pages if needed)
Please see attached sheet.
WHO REQUESTED THE CHANGE Gity E Contractor
WHY IS THE CHANGE NECESSARY
Check all that apply
E Unforeseen / Hidden Conditions E Scope Change
E Other - descibe belowE Error with the Plans and/or Specifications
Explanation:
This change order includes Change Proposal Requests (CPR) 47, 77,78,82,83,84, 85, 86, 89, and 90. Please see the attached
explanation sheet.
REASON FOR CHANGE ORDER VS. BIDDING ADDITIONAL WORK
Check all that apply
E The work is in the area of the original contract and a conflict with the on-site contractor is probable and
would make coordination of work difficult and bidding unreasonable.
EI Time is of the essence and bidding would require the contractor to stop work and the City would face
costly standby fees therefore making bidding disadvantageous
E Emergency Work to correct unsafe conditions.
n Other - describe below
ExplanatiOn: (attached additional pages if needed)
Page 1 of 2
IOAHO
Meridian City Council Meeting Agenda March 5, 2019 – Page 317 of 487
CHAiIGE IN CONTRACT TIiIES:
ContactTines: 896 days
CHANGE IN CONTRACT PRICE:
Orlginal Contrac{ Price:
No. 1 to No. Inar@ortrnm*iF-
changes form prBvlous Chango Orders (calender daF)
1bNo.9
NoLdungcqdcraurtorllEfc 1gl dayS
Net changos from previous Change Orders
ncn..e (decrrere) of thlr Chengc Orden
(o.hnordry.)
of thls Chango Odenlncrcage
t0
Days (lnooase /decrease) to date:
(caLndlrdry!,
Total Chango (lncrease / decrease) to date:
147 days
New Contrect Prlce wlth all Apprcved Change Ordcrr:
I
$36,721,560.461
Ncw Contrrct Tlmor wlth all Apprcved Chenge Odcrs:
(c.Lnd.r d!ys)
t0{3 days
(ClV Purcha3lng lrlenag0o
Keith Watts
(Contrec{or)
s
klr*
tLlzoltb
(City Project Manager)APPROVED BY COUNCIL (lf rcquitcd)
SIGNATURE REQUIRED
see attached sheet.
Date lssued:
Z - Zl--rq
FY Ig
Approval Date:Submitbd to Clerk forAgenda:
Order No.
Amendment:
Available (Attach Report)
lnformation: Budget
Page2ol2
Meridian City Council Meeting Agenda March 5, 2019 – Page 318 of 487
Ghange Proposal Requests (CPR) and Field Orders
CPR #47 - AMS Location and Electrical Wire Length
Description Summary:
Work includes the mounting of the air monitoring system (AMS) transmitters, located within the Primary
Sludge Pump Station, RAS Transfer Station, and the RASMAS Station 2, near the AMS probes.
Why is Change Necessary:
This change is a Scope Change to the Contract, as changes in the mounting location, of the AMS
transmitters needs to be completed per the manufacturer's recommendation.
Reason for change:
lnitially, the AMS transmitters were designed to be located within the electrical room of each of the
following buildings: Primary Sludge Pump Station, RAS Transfer Station, and the RASMAS Station 2.
During the submittal process, it was determined, from the manufacturer, that the AMS transmitters
needed to be located within 50 feet of the AMS probes due to the maximum length of the probe cable.
Because of the maximum cable length, JC was asked to mount the AMS transmitters near the AMS
probes, in the pump room, rather than within the electrical room. This change also required an additional
panel enclosure and electrical connection (conduiUwiring) back to the electrical room.
Cost Negotiation Process:
JCC initially submitted CPR 47 to the City PM, City inspector, and B&C for their review and comment.
Labor cost breakdowns and material costs were provided to the reviewers. The proposed costs were
found to be appropriate for the scope of work. The CPR was recommended by B&C and the costs were
approved considering the need for the AMS equipment.
Final Gost= $22,383.40
Days=
Meridian City Council Meeting Agenda March 5, 2019 – Page 319 of 487
CPR#77 - WAS Floor Gate Pipe Modifications
Description Summary:
Work includes the modification of the WAS wasting gate and box design within the RASMAS Station 2
Why is Change Necessary:
This is a Scope Change/Design Change. After project bidding, B&C's design team identified some O&M
challenges within the RASMAS Station 2 based on a similar design, on a similar project that started up in
late 2017 . The challenges were discussed with City Operations and the changes that were identified were
found to be agreeable to keep maintenance issues to a minimum.
Reason for change:
During a similar project, which began operation in the fall ol2017, B&C engineers identified O&M
challenges that were occuring. ln order to help City Operations, B&C suggested three modifications to the
RASMAS Wasting box and gate to help remedy those identified challenges. The initialgate design had a
vertical open/close. During plant operations the gate actuator struggled to match flow conditions
(constantly opening and closing during wasting of foam) casuing the actuator to wear down. To counter
this, B&C recommended the addition of a weir plate which is attached to the gate. This weir allowed for a
more consistent flow to pass through the gate without the continuous opening and closing of the actuator,
extending the actuator life. The second challenge identified was to rewrite the operating control narrative.
Changes were made to maintain a constant pumping, as wellas maintaining a consistent level in the
wasting box as opposed to continuously changing levels. Slopes were also added into the wasting box to
help move solids towards the pump inlet, rather then let them sit in the corners of the box. The final
challenge that will be remedied with this change is to help control the foam amounts that are created from
the WAS wasting into the box. Spray bars/nozzles, as wellas a flushing connection were added to allow
for a spray pattern to push foam to the inlet of the pump. The flushing connection will allow Operations to
spray foam down manually, as necessary, if any build up occurs.
Cost Negotiation Process:
JCC submitted CPR 77 to the City PM, City inspector, and B&C for their review and comment. Labor cost
breakdowns and materialcosts were provided to the reviewers. The proposed costs were found to be
appropriate for the scope of work. The CPR was recommended by B&C and the costs were approved as
the work was seen as an Operational benefit to the City.
FinalCost=$6,165.71
0
CPR #78 - TSS Probe Style Modification
Description Summary:
Work includes the procurement and installation of an in-basin Total Suspended Solids (TSS) probe at the
RASMAS Station 2.
Why is Change Necessary:
This change is a Scope Change/Owner Directed. The installation of an in-basin TSS probe is to be utilized
to match the current plant probe style. This change came after construction began and was done to keep
equipment styles the same as existing for Operators.
Meridian City Council Meeting Agenda March 5, 2019 – Page 320 of 487
Reason for change:
During the project design, B&C outlined the new instruments to match the existing (at the time) plant
instruments. The existing plant instruments were an insertion type (in-pipe) style TSS probe. ln May
(2018) B&C had discussions with Operations on additional instrumentaion needs and it was identified that
the insertion type TSS probes had recently been switched with an in-basin style TSS probe. As Challenger
has already received delivery of the insertion style TSS probes, they simply returned them and ordered the
in-basin style TSS probes.
Cost Negotiation Process:
JCC submitted CPR 78 to the City PM, City inspector, and B&C for their review and comment. Backup
documentation was provided to the reviewers. The proposed cost was found to be appropriate for the
scope of work and materials/equipment being provided, thus being recommended by BC. The CPR cost
was approved.
FinalCost=
Days=
$4,342.21
0
CPR #82 - Blower Building - NW Drainage Modifications
Description Summary:
This change includes the modifications to the concrete slab located at the NW corner of the Blower
Building. Changes include raising of the finished floor of the interior of the blower building electrical room
and placement of concrete on the exterior of the building to create a 2o/o slope for drainage. Work also
includes the installation of a 4-inch drain pipe through the concrete wall, with perforated and wrapped 4-
inch drain pipe that discharges into an underdrain manhole at the northeast corner of the new aeration
basins.
Why is Change Necessary:
This is an Error/Ommission with the plans. ln discussing with B&C, the drawings/details that highlight the
plans for construciton of the building exterior concrete are ambiguous and don't specifically call out a
specific slope with a note indicating to slope away from doors, thus leaving it to the Contractor to figure out
the necessary slope requirements. Had a specific slope and note been called out, or identified within the
drawings, the ambiguity would have been removed. ln our opinion, the inclusion of those specific details
would have brought a higher bid price for this specific item and would have been paid for at time of
bidding, thus approval of the change.
Reason for change:
The exterior concrete, outside the NW corner of the blower building (exit from electrical room) was poured
with little to no slope, away from the doors. Due to this, water pools outside the door, which is not idealfor
the location (outside electrical room). JC poured this area as a continuous slab, which should have been
stoped away from the building, but wasn't. Several options were looked at by the team (COM, JC, and
B&C) including a canopy over the entire area to keep rain/snow away from the building walkway. After
receving pricing on the various options, it was determined that the most economical solution was to raise
the door threshold and pour a sloped concrete toping in tha area to direct the water away from the
doorway. A drainage penetration was also included to the retaining wall to facilitate the drainage of water
into a nearby underdrain manhole.
Meridian City Council Meeting Agenda March 5, 2019 – Page 321 of 487
Cost Negotiation Process:
JCC submitted CPR 82 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. Multiple options were identified and
reviews of labor and material costs were completed. The most economical solution was chosen. The
proposed time and costs were reviewed and are considered to be in line with the standard for this type of
work. The proposed cost was found to be appropriate and was recommended for approval by BC. The
CPR cost was approved.
FinalCost= $14,633.38
Description Summary:
This Change Request is a credit, to the Contract, for the pricing of VFDs for the Axial Pumps that were
used on the project.
Why is Change Necessary:
This change request falls under the Other category. The City sole sourced and provided the VFDs for the
project, therefore the VFD pricing that was provided in JC's bid was not necessary and should be
deducted.
Reason for change:
During the submittal review process, for the Axial Pumps, B&C identified that JC included the VFD pricing
within their bid for the project. The VFDs were not included within the scope of work for the electrical
subcontractor. The VFDs were purchased by the City to ensure consistency with the sole source VFD
specification. As the VFD was purchased by the City, the bid pricing, for the VFDs will be credited back to
the City.
Cost Negotiation Process:
JCC submitted CPR 83 to the City PM, City inspector, and B&C for their review and comment. Material
costs were provided and were consistent for the pricing of VFDs. The proposed credit was found to be
appropriate and was recommended for approval by BC. The CPR cost was approved.
FinalCost= ($21,491.421
Days= 0
GPR #83 - Axial Pump VFD Credit
Meridian City Council Meeting Agenda March 5, 2019 – Page 322 of 487
CPR #84 - IMLR Pump Rail Support
Description Summary:
Work includes labor and materials for fabrication of a stainless steel angle base plate to be installed at the
top of the aeration basin wall to provide additional structural support for the IMLR pump slide rails, per the
man ufactu rers recom mendation.
Why is Change Necessary
This is a Scope change to the Contract. The manufacturer for the IMLR pumps provided a height
requirement for the pump slide rail support. As the height of the designed aeration basin walls is not high
enough to provide the necessary support dimensions, as well as the pump supplier not able to provide a
bracket that will help to meet the height requirements, JC is providing the materials and fabrication of a
bracket to provide the support.
Reason for change:
The IMLR pump rails are situated 90-degrees to the full height wall and is not high enough to provide the
manufacturer required support for the pump slide rails. Because the manufacturer does not supply a
perpindicular bracket for this situation, JC proposed fabricating a bracket, for placement, at the top of
each pump rail system, which will attach to the full height aeration basin wall. This will provide the
necessary support for the IMLR pump slide rails to meet the requirements of the manufacturer.
Cost Negotiation Process:
JCC submitted CPR 84 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. The proposed time and costs were
reviewed and are considered to be in line with the standard for this type of work. The proposed cost was
found to be appropriate and was recommended for approval by BC. The CPR cost was approved.
FinalCost=
DaYs=
$7,067.68
0
CPR #85 - Mixer Support
Description Summary:
Work includes the installation of stainless steel base plates to support the mixers within aeration basins 5
and 8, as well as anchoring the base plates to the concrete foundation with stainless steel bolts.
Why is Change Necessary:
This change is a Design Error/Omission. The mixer locations within Aeration Basins 5 and 8 were
designed in a certain location to provide the necessary mixing required for the biological process of the
basins. The anchoring the mixers to the wall or base slab were on the contractor to complete. Due to the
location of the dewatering channel within each basin, there wasnt a direct location for anchoring the
mixers to the foundation slab. lf this would have been apparent at time of bidding, the City would have
paid for these costs and as such are accepting of paying for the requested change.
Meridian City Council Meeting Agenda March 5, 2019 – Page 323 of 487
Reason for change:
During the installation of the mixer rails in Aeration Basins 5 and 8, it became apparent that the bottom of
the mixer rail required support to span the dewatering channel. JC worked with the mixer supplier to
identify several options and the selected plate support appeared to be the most cost effective. As the
manufacturer's recommendations for anchoring support could not be met initially it was decided to move
forward with the identified solution.
Cost Negotiation Process:
JCC submitted CPR 85 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. The proposed labor and material
costs were reviewed and are considered to be appropriate for this type of work. The CPR cost was
approved recommended by B&C and approved by City staff.
FinalCost=
DaYs=
$7,414.50
0
CPR #86 - RASMAS Station 2 - Concrete Modifications
Description Summary:
Work includes modification to the structural concrete at the RASMAS Station 2 building to lower the
bottom of the footing elevation, construction of an 8-inch curb under the CMU block, and raising the
finished floor elevation on the east side of the building.
Why is Change Necessary:
This is a Design Error/Omission. There was a discrepancy between the architecturaland structural
drawings in regards to the details for starting the CMU block on a concrete curb or directly to the floor
slab. ln addition, the civil drawing, showing the exterior grading, did not provide for adequate cover over
the pump room footings. These resulted in the necessary changes JC is requesting. Had the plan sheets
shown the items listed above, the City would have paid for those items at the time of Contract Award.
Reason for change:
The architectural and structural drawings had different details for starting the CMU block, with one
showing to start on the concrete curb and the other showing to start the block directly on the floor slab.
JC's preferance was to start the CMU block on the concrete curb and as such, required additional rebar
and concrete for the footing stem and CMU block starter wall. The changes requested by JC are
consistent with how all the other buildings, on the project, had the CMU block start. Another item that this
request requires was for additional grading adjustments, as the civil drawing of the exterior grading did not
provide an adequate amount of cover over the pump room footings.
Meridian City Council Meeting Agenda March 5, 2019 – Page 324 of 487
Cost Negotiation Process
JCC submitted CPR 86 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. The proposed labor and material
costs were reviewed and are considered to be appropriate for this type of work and are comparable to
prices we have seen on similar work previously done on the project. The proposed cost was found to be
appropriate and was recommended for approval by BC. The CPR cost was approved.
FinalCost= $17,597.40Davs= 0
CPR #89 - Additiona! Conduit to Blower and Ghemica! Feed Buildings
Description Summary:
Work includes the installation of a 4-inch conduit, with pull cord, between the pad mounted swtich and the
transformer serving the new blower building and chemical feed buildings.
Why is Change Necessary:
This work is a Scope Change to the Contract. The additional conduit being installed, under this change,
was requested by the City to provide redundancy for backup power.
Reason for change:
As a follow up to the Primary Power lmprovements being completed at the WRRF, the City evaluated
redundancy options for backup power to the new blower and chemical feed building transfomers. The
preferred approach included a redundant feed line (4-inch conduit) from the pad mounted switch to the
new transformer serving the chemical feed building. The installation of the conduit will allow for future
installation of conductors without the need to excavate in the future.
Cost Negotiation Process:
JCC submitted CPR 89 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. The proposed labor and material
costs were reviewed and are considered to be appropriate for this type of work and the material used. The
proposed cost was found to be appropriate and was recommended for approval by BC. The CPR cost
was approved.
FinalCost=
Days=
$7,182.46
0
CPR #90 - 36-inch RAS/Existing Water Conflict at Blower Building
Description Summary:
Work includes the relocation of portions of the existing 8-inch potable water line, near the new blower
building, that was in conflict with the design location of the 36-inch RAS line. The relocation included
raising and lowering of the 8-inch line in two locations.
Why is Change Necessary:
This change request is an unforseen/hidden condition. The conflict with an existing waterline near the new
chemical feed and blower buildings was due to the actual field location, of the existing water line, differing
than where it was shown in the construction plans.
Meridian City Council Meeting Agenda March 5, 2019 – Page 325 of 487
Reason for change:
The existing 8-inch potable water main was located approximately 5.5 feet west of the designed location
of the 36-inch RAS line. The construction plans showed the 8-inch potable water line approximately 11
feet east of the 36-inch RAS line. Because of this conflict, the decision was made to adjust the existing 8-
inch line vertically in two spots. on the southeast corner of the blower building, the line was raised to go
over the top of the 36-inch RAS line on the northeast side of the blower building, the 8-inch line was
adjusted to go underneath the 36-inch RAS line. After pricing discussions with JC it was found to be more
economical to adjust the 8-inch water line rather than adjust the 36-inch RAS line.
Cost Negotiation Process:
JCC submitted CPR 90 to the City PM, City inspector, and B&C for their review and comment.
Breakdowns of labor costs, as well as material costs were provided. The proposed labor and material
costs were reviewed and are considered to be appropriate for this type of work and the material used. The
daily work field order reports were provided by JC and follow what was completed in the field. The
proposed cost was found to be appropriate and was recommended for approval by BC. The CPR cost
was approved. The additional days requested were found to be accetpable based on the timeframe the
conflict took to solve and the impact it had on JC's schedule.
FinalGost= $23,350.94Days= 10
Meridian City Council Meeting Agenda March 5, 2019 – Page 326 of 487
co #1
CPR #2
CPR #3
CPR #4
CPR #5
CPR #6
cPR #1 I
cPR #13
cPR #16
Dewatering Pipe Damage-Flood
Chemical Building Roof Drain
Lighting Change
Vehicle Grounding
350 HP Aeration Blower Conduit
66" Dia. Pipe Material Credit
AFFF Concentrate Line Material
Screen to separate >3" cobble
Eliminate Sub-Slab Waterproofing or Vapor Barrier I Dampproofing Water Bearing Tanks
Discharge Elevation of Blower Building Drain Line
Cap and Bulkhead for 66" SE Pipe for Future Tertiary Project
Weather Delay
$2,787.01
$3,958.16
$0.00
$967.50
$3,102.90
-$s8,290.00
-$750.00
$5,7s9.39
Total=-$42,46s.04
-$68,860.58
$0.00
$7,393.81
$0.00
-$61,465.77
36
Total=
Total additional days=
Total=
CO Total Cost=
co#2
CPR #7
CPR #9
cPR#27
cPR #19
co #4
CPR #29A
cPR #37
cPR #38
cPR #41C
co #3
CPR #8
CPR #1OA
CPR #124
cPR#24
cPR #28
AMS
Fire Alarm Panel
Gas Detector
Galvanizing
Screening Additional Week
RASMAS Duct Bank
Contaminated Soil
Value Engineering
Secondary Clarifier #7 Dewatering and SG Repair
Cost
$17,281 .30
$47,822.97
$9,706.79
$16,824.36
$2,879.15
Days
7
10
3
$94,514.57
-$9,417.24
20
co #5
cPR #17
cPR #21
cPR#22
CPR#4,2
cPR #50
CPR #52
Primary Sludge Hatch Roof Curbs
Chemical Building Float Switches
Blower VFDs
RAS Transfer Subgrade Repair
Drain Pump Guide Rail Assembly
Rotameter
Upgrade to Existing Non-Potable Water Lines
SC7 Subgrade Delay
Chemical Building Vapor Barrier
Secondary Clarifier 6 Subgrade Repair
RAS Transfer Station CMU Height
Cost Days
$55,384.97
$22,923.13
-$83,600.00
$28,777.65
Total= $23,485.75 0
CO Total Cost= $14,068.51
Cost Days
$3,s78.46
$889.25
$27,107.94
$7,577.84
$11,0,t0.80
$7,542.74
Total= $57,707.03 0
CO Total Cost= $71,775.il
Cost
$31,128.22
$12,726.31
$0.00
$13,446.38
$6,010.20
Daysco #6
cPR #14
CPR #43E
cPR #45
cPR #56
cPR #57
Total=
CO Total Cost=
$63,311r 1
$135,086.65
0
Meridian City Council Meeting Agenda March 5, 2019 – Page 327 of 487
co #7
CPR #30
cPR #46
cPR #58
co #8
cPR #48
cPR #61
cPR #62
cPR #68
cPR #70
Cost
$57,432.35
$22,684.96
$420,000.00
Days
66-inch SE Modifications
DO Probe/Transmitter lnstalltion within Aeration Basins 116 and #8
Primary Power lmprovements
Chemical Building - Fire Sprinkler Coating
Chemical Metering Pumps VFD Panels
Secondary Splitter Box Coarse Bubble Diffuser
20-inch ML Pipe Materials
Stainless Steel Methanol Tank Overflow Modifications
Retaining Wall Changes
Convenience Outlets
Knife Gate Stem and Gear Box Extension
PSPS Electrical Elevation Modifications
Blower Building Electrical Elevation Modifications
RAS Transfer Electrical Elevation Modifications
Coarse Bubble Diffuser in AB 9-12 (Droplegs)
Electrical Support Racks
Secondary Clarifier Weir Wash Pumps
Blower Building - Electrical Room Double Door Modifications
RAS Transfer HDPE Manifold Modificaitons
RASM/AS HDPE Manifold Modifications
AMS Location and Electrical Wire Length
WAS Floor Gate Pipe Modifications
TSS Probe Sgle Modifications
Blower Building - NW Drainage Modifications
Axial Pump VFD Credit
IMLR Pump Rail Support
Mixer Support
RASM/AS Station 2 - Concrete Modifications
Additional Conduit to Blower and Chem Feed Buildings
36-inch RAS/Existing water Conflict near Blower Building
21
Total
CO Total Cost =
Total
Overall CO Total Cost =
Total
Overall CO Total Cost =
Total
Overall CO Total Cost =
$500,1 17.3r 21
$63s,203.96
Cost
$5,493.79
$27,433.36
$17,748.17
$50,856.04
$4,040.97
Days
$105,s72.33
$740,776.29
0
Days
60
co #9
CPR #25B
cPR #54
CPR #59A
cPR #64
cPR #65
cPR #66
cPR #69
cPR #71
cPR#72
cPR #73
cPR #76
cPR #80
co #10
cPR#47
cPR#77
cPR #78
cPR #82
cPR #83
cPR #84
cPR #85
cPR #86
cPR #89
cPR #90
Cost
$99,955.50
$13,376.99
$66,576.79
$7,494.27
$36,604.84
$13,809.89
$23,s92.92
$15,398.09
$3,711.39
$4,201.77
$12.462.04
$29,953.42
$327,',t37.91 60
$1,067,914.20
Cost
$22,383.40
$6,165.71
$4,342.2',1
$14,633.38
-$21,491.42
$7,067.68
$7,414.50
$17,597.40
$7,182.46
$23,350.94
Days
10
$88,646.26
$1,156,560.46
10
Meridian City Council Meeting Agenda March 5, 2019 – Page 328 of 487