HomeMy WebLinkAboutResolution - 2021-R0371 - Change Order No. 2 to Contract 15325 with Red River Construction 9.28.21Resolution No. 2021-R0371
Item No. 7.12
September 28, 2021
RESOLUTION
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF LUBBOCK:
THAT the Mayor of the City of Lubbock is hereby authorized and directed to execute for
and on behalf of the City of Lubbock, Change Order No. 02 to that certain Contract No. 15325 by
and between the City of Lubbock and Red River Construction for the Southeast Water Reclamation
Project — Plant 3 Improvements, and related documents. Said Change Order No. 02 is attached
hereto and incorporated in this resolution as if fully set forth herein and shall be included in the
minutes of the City Council.
Passed by the City Council on September 28, 2021
LI-11-i
DANIEL M. POPE, MAYOR
ATTEST:
Re a ca Garza, City Secr tart'
APPROVED AS TO CONTENT:
C-111V
Jesica cEachern, Assistant City Manager
APPROVED AS TO FORM:
&144UAC
K 11i Leisure, ssistant City Attorney
ccdocs/RES.Contract 15325 CO#2 SEWRP Plant 3
09.09.21
Office of Purchasing and Contract Management
Change Order
Contract No: 15325 Contractor: Red River Construction
Change Order No: 2 Contract Title: SEWRP — Plant 3 Improvements Project
Bid/RFP No: 20-15325-CM Project No: 92444.9242.30000
"Change Order" means a written order to a Contractor, executed by the Owner, in accordance with the Contract authorizing an addition to, deletion
from, or adjustment or revision of the requirements of the Contract documents, or an adjustment to the compensation payable to the Contractor, or to
the time for performance of the Contract and completion of the project, or a combination thereof, which does not alter the nature of project and is an
integral part of the project objective. Adjustments to "Estimated Quantities" to a line time in a Unit Price Contract do not require a Change Order. All
work that alters the nature of the construction or that is not an integral part of the project objective must be let out for public bid.
Description of Change (alteration, deviation, addition, or deletion) caused by conditions encountered durine construction not covered by the
of
Per attached backup material, this Change Order #2 includes the following items: Item 1) Four additional combination air valves at the RAS pumps at a cost of
+$15,556.21. Item 2) Relocation of existing and proposed WAS pumps at a cost of+$76,918.62 and +7 days. Item 3) New Plant 3 NPW loop at a cost of
+$99,581.72 and+45 days. Item 4) Additional dewatering pumps for aeration basin exploratory work at a cost of+$12,476.19. Item 5) Additional dewatering
pumps for aeration basin exploratory work beyond Item 4 at a cost of+$19,857.33, and +7 days. Item 6) Concrete coating credit of-$300,000.00. Item 7)
Additional electrical junction boxes at a cost of+$3,721.26. Item 8) Piping and installation to reconnect existing aeration grid to new aeration lateral piping at a cost
of+$308,015.43 and +45 days. Item 9) Additional work associated with the NPW line at a cost of+$46,559.87 and +10 days. Item 10) NPW piping modification at
EPS-1 at a cost of+$10,596.44 and +2 days. Item 11) Potable RAS pump seal water at a cost of+$14 960.82 and +3 days.
Where the Change Order is negotiated, the Change Order must be fully documented and itemized as to costs, including material quantities, material
costs, taxes, insurance, employee benefits, other related costs, profit and overhead. Where certain unit prices are contained in the initial Contract, no
deviations are allowed in computing negotiated change order costs.
ITEMIZED COSTS MUST BE FULLY DOCUMENTED AND ATTACHED TO THIS FORM.
ITEM
DESCRIPTION
AMOUNT
A.
ORIGINAL CONTRACT VALUE:
$7,257,052.00
B.
AMOUNT OF THIS CHANGE ORDER: Note: Council approval required if (+/-) $50,000
$308,243.89
COST CENTER: 4545 1 ACCOUNT: 92444.9242.30000
C.
PERCENT OF CONTRACT VALUE THIS CHANGE ORDER B/A)
4.25%
D.
AMOUNT OF PREVIOUS CHANGE ORDERS:
$391,736.14
E.
TOTAL AMOUNT OF ALL CHANGE ORDERS (B+D)
$699,980.03
F.
PERCENT OF CONTRACT OF ALL CHANGE ORDERS (E/A): (25% maximum)
9.65%
G.
NEW CONTRACT AMOUNT A+E):
$7,957,032.03
It is mutually agreed that the above dollar amount and the time extension, as applicable, as set forth in this Change Order constitutes full compensation
to the Contractor for all costs, expenses and damages to the Contractor, whether direct, consequential or otherwise, in anyway incident to, or arising
out of, or resulting directly or indirectly; from the work performed or modified by the Contractor under this Change Order.
Purchasing and Contract�Marraeemeat department):
(1) Contractor
(7) Mayor
Council Date: September 28, 2021
Date
9/28/2021
Date
Agenda Item #• 7.12
Grp
8/31/21
Date
q 6tZ-,?Vdq
Date
Date
9/28/2021
2021-RO371
PUR-45 (Rev 08/2018)
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Engineers... Working Wonders With Waters
August 31, 2021
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
1314 Avenue K
Lubbock, TX 79401
Subject: SEWRP Plant 3 Improvements Project
Change Order #2
Dear Mr. Fekete:
Attached with this letter is documentation for Change Order #2.
Time
Item
Description
Cost Impact
Impact
Status
1
Four additional combination air valves, one per RAS
+$15,556.21
No Time
Recommended as
pump
modified by Carollo
2
Relocation of existing and proposed WAS pumps
+$76,918.62
7 days
Recommended as
modified by Carollo
3
New Plant 3 NPW loop
+$99,581.72
45 days
Recommended by
Carollo
4
Additional dewatering pumps for aeration basin
+$12,476.19
No Time
Recommended by
exploratory work
Carollo
5
Additional dewatering pumps for aeration basin
+$19,857.33
7 days
Recommended by
exploratory work beyond Item 4
Carollo
6
Credit for not coating interior concrete surfaces of
_$300,000.00
No Time
Recommended by
the existing secondary clarifiers
Carollo
7
Additional electrical junction boxes
+$3,721.26
No Time
Recommended by
Carollo
8
Piping and installation to reconnect existing aeration
+$308,015.43
45 days
Recommended by
grid to new aeration lateral piping and drops
Carollo
9
Additional work associated with the NPW line
+$46,559.87
10 days
Recommended as
modified by Carollo
10
NPW piping modification at EPS1
+$10,596.44
2 days
Recommended as
modified by Carollo
11
Substitution of potable water for NPW for RAS pump
+$14,960.82
3 days
Recommended as
seal water
modified by Carollo
Total Contract Impacts from CO #2 PCOs:
+$308,243.89
+119 days
Items recommended for inclusion with Change Order #2 are described in more detail as follows:
89008.30121.M31_Fekete.doex 8911 Capital of Texas Highway North, Suite 2200, Austin, Texas 78759
P. 512.453.5383 F. 512.453.0101
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 2
Item 1
During the submittal process the Engineer identified four combination air valves that were not
shown on the Drawings. These valves were to be located upstream of each check valve on the
four RAS pumps to ensure opening of the check valve would not be hindered by air binding
upon pump startup.
RRC is requesting $15,556.21 and an additional 7 days of contract time for additional work
required to purchase and install the four valves. The Engineer and RPR have reviewed the
request, and have found the cost and effort to be in line with what would be expected, but do not
find a basis for requesting a contract time extension associated with these additional valves.
The following documents are attached to support Item 1:
1. Potential Change Order (PCO) #005 dated February 23, 2021 from Heath Staffeld of
RRC with the proposal and cost backup for the additional work.
2. PCO #005 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 2
During construction a suggestion was made by SEWRP Staff that WAS pumps that have always
been at the east end of the aeration basin gallery could be moved to the location previously
occupied by the RAS pumps near the access stairway at the west end of the aeration basin
gallery. This relocation is much better for operation and maintenance access, particularly given
that replacement of the aeration basin influent line under Change Order No. 1 resulted in a 36-
inch pipe crossing the gallery, thereby requiring the addition of a stairway to allow the pipe to be
crossed to access the east end of the aeration basin gallery. The relocation of the WAS pumps
also shortens the WAS discharge line, allows the pumps to be oriented in a way providing much
better access for maintenance, and places the WAS flow meter in a better location for use and
maintenance.
The Engineer provided sketches to RRC to help develop an approach and a cost for relocation
of the WAS pumps. Based upon this information, RRC proposed a cost of $76,918.62 and an
additional 21 days of contract time for the additional work. The Engineer and RPR have
reviewed the proposal, and have found the cost and effort to be in line with what would be
expected, but do not find a basis for requesting a 21-day contract time extension associated
with this additional work. After further consideration, 7 days contract time extension was
deemed appropriate.
The following documents are attached to support Item 2:
1. PCO #006 dated April 21, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
89008.30 1 21-0831_Fekete.dax
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 3
2. PCO #006 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 3
The Plant 3 Improvements Project did not intend any change to the non -potable water (NPW)
service lines serving Plant 3. NPW service is required for hose valve stations near the new RAS
pump station, and secondary clarifiers, and for the spray bars in the new scum pump stations. It
was understood that NPW water had not been available to the final clarifiers in Plant 3 for some
time, but the project assumed the service could be re-established from the Plant 3 Effluent
Pump Station. RRC performed exploratory digging to locate the NPW piping. No live pipe could
be located. Eventually, a large plug made up of WAS media was removed in the main NPW line
connecting from the Plant 4 Effluent Pump Station. Ultimately it was determined that the only
practical way to re-establish NPW service in Plant 3 was to install a new NPW loop. RRC was
requested to submit a proposal for constructing a new NWP loop in Plant 3.
RRC proposed a cost of $99,581.72 and an additional 45 days of contract time for the additional
work. The Engineer and RPR have reviewed the proposal, and have found the cost and effort to
be in line with what would be expected, and also agree with the request for a 45-day contract
time extension associated with this additional work.
The following documents are attached to support Item 3:
1. PCO #007 dated April 27, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
2. PCO #007 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 4
The Plant 3 Improvements Project requires each of the three existing aeration basins be
dewatered to allow installation of new aeration piping to the existing aeration grids. RRC began
dewatering Basin 1 first. There were instances of the basin being dewatered to a certain point
on a Friday, only to return on Monday morning to find the basin filled with water again. This
discovery led to the need to employ additional pumps to allow pumping that would overcome
whatever inflow was happening.
RRC proposed a cost of $12,476.19 for the additional work associated with procurement and
installation of additional pumps. The Engineer and RPR have reviewed the proposal, and have
found the cost and effort to be in line with what would be expected.
The following documents are attached to support Item 4:
1. PCO #008 dated May 5, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
8900B.30121.OS-31 Fekete.dom
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 4
2. PCO #008 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 5
The Plant 3 Improvements Project requires each of the three existing aeration basins be
dewatered to allow installation of new aeration piping to the existing aeration grids. After
additional pumping efforts associated with PCO #008 RRC continued to find the aeration basin
re -filling with water, and no apparent point of leakage could be found. This continued issue led
to the need to employ additional 6-inch, 4-inch, and 3-inch pumps to allow pumping that would
overcome the inflow that was being experienced.
RRC proposed a cost of $19,857.33 for the additional work associated with procurement and
installation of additional pumps. If pumping would need to be continued after the first week, the
cost was proposed at $12,821.40 per week. The proposal also requested a 7-day extension to
the contract time. The Engineer and RPR have reviewed the proposal, and have found the cost
and effort to be in line with what would be expected, and also agree with the request for a 7-day
contract time extension associated with this additional work.
The following documents are attached to support Item 5:
1. PCO #009 dated May 5, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
2. PCO #009 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 6
The Plant 3 Improvements Project specified the interior concrete surfaces of the existing
secondary clarifiers be coated with an elastomeric polyurethane coating. After dewatering
Secondary Clarifier No. 2, the concrete was found to be in excellent condition. Because of the
condition of the concrete, the coating of the concrete was reconsidered, and a credit to not coat
the concrete was requested.
RRC proposed a credit of $300,000.00 for not coating the interior concrete surfaces of the
existing secondary clarifiers. The Engineer and RPR have reviewed the proposal, and have
found the credit to be in line with what would be expected.
The following documents are attached to support Item 6:
1. PCO #010 dated May 5, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
2. PCO #010 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
8900B.30 1 21.0&31 Fekete.docx
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 5
Item 7
Relocation of the WAS pumps as recommended in Item 2 of this Change Order No. 2 resulted
in two existing electrical junction boxes being in conflict with relocated WAS pump suction
piping. To address this issue, a pair of new junction boxes were proposed by RRC. The wiring
from the existing boxes will be extended to the new boxes that will be mounted below the WAS
pipe.
RRC proposed a cost of $3,721.26 for the additional work associated with procurement and
installation of the new junction boxes. The Engineer and RPR have reviewed the proposal, and
have found the cost and effort to be in line with what would be expected.
The following documents are attached to support Item 7:
1. PCO #011 dated July 19, 2021 from Heath Staffeld of RRC with the proposal and cost
backup for the additional work.
2. PCO #011 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 8
The Plant 3 Improvements Project did not intend any change to the existing aeration basin
diffuser grids, other than reconnection of the grids to the new aeration lateral piping. The new
piping reduces the number of drops to the aeration grids from 28 per basin to six per basin,
thereby preparing for application of future dissolved oxygen control when Plant 3 is converted to
biological nutrient removal (BNR). Details for how the connection from the new drops to the
existing aeration grid were not provided, as it was expected that what the Contractor found upon
dewatering the basin could impact the approach taken. Once the first of the three aeration
basins was successfully dewatered RRC was able to work with the Engineer and the diffuser
manufacturer Sanitaire to develop the approach for reconnecting the aeration grid.
RRC proposed a cost of $308,015.43 and an additional 90 days of contract time for the
additional work. The Engineer and RPR have reviewed the proposal, and have found the cost
and effort to be in line with what would be expected, but do not find a basis for requesting a 90-
day contract time extension associated with this additional work, as the work was a part of the
original scope of work. After further consideration, 45 days contract time extension was deemed
appropriate, or 15 days per basin as the Contractor could not have fully understood the effort
required until the conditions were known upon basin dewatering.
The following documents are attached to support Item 8:
1. PCO #012.2 dated August 24, 2021 from Dean Porter of RRC with the proposal and cost
backup for the additional work.
2. PCO #012.2 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
8900B.30 1 21.0&31 Fekete.docx
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 6
Item 9
As noted for Item 3, the Plant 3 Improvements Project did not intend any change to the non -
potable water (NPW) service lines serving Plant 3. NPW service is required for hose valve
stations near the new RAS pump station, and secondary clarifiers, and for the spray bars in the
new scum pump stations. It was understood that NPW water had not been available to the final
clarifiers in Plant 3 for some time, but the project assumed the service could be re-established
from the Plant 3 Effluent Pump Station. RRC performed exploratory digging to locate the NPW
piping. No live pipe could be located. Eventually, a large plug made up of IFAS media was
removed in the main NPW line connecting from the Plant 4 Effluent Pump Station, requiring
removal of an existing valve, and extensive flushing of the line. A new connection was made,
and a blow -off connection and valve was installed to aid WWTP staff if future problems are
encountered. The NWP line has also required hand excavation under existing duct banks,
locating of additional duct banks, and installation of flowable fill.
RRC proposed a cost of $46,559.87 and an additional 17 days of contract time for the additional
work. The Engineer and RPR have reviewed the proposal, and have found the cost and effort to
be in line with what would be expected, but do not find a basis for requesting a 17-day contract
time extension associated with this additional work. After further consideration, 10 days contract
time extension was deemed appropriate.
The following documents are attached to support Item 9:
1. PCO #013 dated July 29, 2021 from Dean Porter of RRC with the proposal and cost
backup for the additional work.
2. PCO #013 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 10
As noted for Item 3, the Plant 3 Improvements Project did not intend any change to the non -
potable water (NPW) service lines serving Plant 3, but a new NPW loop is needed to allow the
new systems to function properly. As part of the new NPW loop a new pipe has been installed
from the discharge of the existing NPW pump at the Plant 3 Effluent Pump Station. This pipe
was run straight from the pump discharge at an elevation approximately 5 feet above the slab.
The City staff has requested this pipe be lowered so that it may be stepped over, rather than
ducked under, for improved safety when performing maintenance activities in the pump station
area.
RRC proposed a cost of $10,596.44 and an additional 4 days of contract time for the additional
work. The Engineer and RPR have reviewed the proposal, and have found the cost and effort to
be in line with what would be expected, but do not find a basis for requesting a 4-day contract
time extension associated with this additional work. After further consideration, 2 days contract
time extension was deemed appropriate.
The following documents are attached to support Item 10:
8900B.30 1 21-OS-31_Fekete.docx
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 7
1. PCO #014 dated July 30, 2021 from Dean Porter of RRC with the proposal and cost
backup for the additional work.
2. PCO #014 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
Item 11
The Plant 3 Improvements Project includes new return activated sludge (RAS) pumps, with two
pumps dedicated to each secondary clarifier. The new pumps are vertical turbine solids
handling pumps (VTSH) that have allowed complete replacement of the existing RAS pumps,
and offer improved maintenance access and improved process control. The RAS pumps are
critical to the treatment process. As with other types of pumps, VTSH pumps have shaft seals
that require seal water to keep them clean and lubricated. It is common to provide non -potable
seal water to pumps in a wastewater application, and the design intent was to provide NPW to
the pump seals. Given the experience on the project with the NPW piping, and the plugging that
was cleared in the existing NPW line as described in Item 9, the pump manufacturer, Flowserve,
has recommended that the VTSH pump seal water to be provided be potable water rather than
NPW. After further consideration, the Engineer agrees that given the critical nature of the RAS
pumps to the treatment process, and the investment associated with this type of pump it would
be best to avoid potential issues that might be associated with the use of NPW as seal water,
and instead provide a backflow preventer and new 1-inch potable water service line from an
available potable water line near the Plant 3 blower building.
RRC proposed a cost of $14,960.82 and an additional 7 days of contract time for the additional
work. The Engineer and RPR have reviewed the proposal, and have found the cost and effort to
be in line with what would be expected, but do not find a basis for requesting a 7-day contract
time extension associated with this additional work. After further consideration, 3 days contract
time extension was deemed appropriate.
The following documents are attached to support Item 11:
1. PCO #015 dated August 4, 2021 from Dean Porter of RRC with the proposal and cost
backup for the additional work.
2. PCO #015 Response from Jason Anderson of Carollo Engineers with the Engineer's
response to the proposal.
89008.30121-W31 Fekele.doa
carollo.com
Mr. Zoltan Fekete, P.E.
Senior Engineer
City of Lubbock, Texas
August 31, 2021
Page 8
The change in contract price associated with items 1 through 11 is summarized below:
• Original contract price : $7,257,052
• Net increase in price of this change order: +$308,243.89
• Contract price with all approved change orders: $7,957,032.03
• Original contract time: 600 Days to Final Completion
• Net increase of time with this change order: +119 days
• Contract time with all approved change orders: 810 days to Final Completion
After you have had a chance to review this information, we are available to discuss any
questions or comments, at your convenience. Please contact, Jason Anderson, or myself with
any questions.
Thank you for the opportunity to provide construction phase services for the City of Lubbock.
We look forward to continuing to work with you and City staff on this project through its
successful completion.
Sincerely,
CAROLLO ENGINEERS, INC.
V,' �. �4,
Hani E. Michel, P.E.
Project Manager
J EA: jea
cc: Josh Kristinek, P.E.
Mary Gonzales
Mark Aaron Carpenter
Jason Anderson, P.E.
8900B.30121-08.31 Fekete.docx
carollo.com