HomeMy WebLinkAboutContract 51521-CO3FORT �VORTH Clty of Fort Worth
Change Order Request CSC No. 51521-0O3
PfOJ2CE N8fi10: Emergency Response - Trinity River Slreambank Erosion Affecling hvo 90-inch Sanilary Se�ver Lines City Sec No.: 51521
PI'OJ2CE NO,�S�: Emerency installation of vertical tiebacks DOE No. N/A City Proj. No.: 102346
Project Description:
Emergency Installation of vertical tiebacks and extra depth walls
Contractor: Humphrey & Morton Construction Company, Inc. Change Order #�3 Date: 4/1412021
City Project Mgr. Tony Sholola City Inspector: David Johnson
Phone Number: 817-392-6054 Phone Number: 817-392-8455
Dept
Original Contract Amount
Extras to Date
Credits to Date
Pending Change Orders (in M&C Process)
Contract Cost to Date
ou
e uraer
Original Funds Available for Change Orders
Remaining Funds Available for this CO
Adtlitional Funding (if necessary)
Sewer Unit 1 I Sewer Unit 2 I Sewer Unit 3
Totals Contract Time
(Calender days)
$650,000.00
$3,557,270.00
270.00
CHANGE ORDERS to DATE (INCLUDING THIS ONE) AS % OF ORIGINAL CONTRACT
MAXALLOWABLE CONTRACT AMOUNT (ORIGINAL CONTRACT COST+ 25%)
JUSTIFICATION (REASONS) FOR CHANGE ORDER
The change order will provide additional funding to complete the project as described below:
270.00
301.95
1.95
711.47%
$812,500.00
In the spring of 2016 significant erosion ofthe Trinity River streambank occurred due to heavy rains and upstream reservoir releases. The streambank erosion
jeopardized the stability of the two 90-inch diameter West Fork collector sewer lines, which tonvey a significant portion of Fort Worth's wastewater to the
downstream Village Creek Water Reclamation Facility. An emergency memo was routed on June 7, 2016, for preliminary bank stabilization while emergency
engineering design by DeOtte Engineering commenced. On September 26, 2017 (M&C C-28407), City Council authorized the execution of the contract which is
the subject of this M&C, a competitively procured contract (CSC 49826) with Humphrey & Morton Construction Company, Inc. ("HMCCI"), in the amount of
$1,867,535.00, for construction of a reinforced concrete wall with rock gabion baskets to stabilize the streambank and protect the West Fork collector sewer lines
based on the emergency design. However, additional heavy rains which occurred in the fall of 2018 and spring of 2019 resulted in additional erosion of the
streambank necessitating additional emergency work which both Circle C Construction Company (CSC 51472) and HMCCI jCSC 51521) (10/17/18 emergency memo)
were engaged to construct, consisting of additional steel sheet pile tutoff wall with anchored tiebacks to reinforce the streambank and provide temporary support
for the collector sewer lines.
The additional streambank erosion that octurred in 2018 and again in 2019 resulted in substantially changed conditions, rendering the original DeOtte
Engineering design ofthe reinforced concrete wall and gabion baskets no longer constructible, leading to the mutual decision to terminate CSC 49526. The changed
conditions required additional engineering and design, this time provided by Freese and Nichols, Inc. (CSC 53101), including flow deflection structures along the
lower portion of the stream bank to prevent the river from moving towards the twin 90-inch pipes. The upper portion of the stream bank will be protected with large
rock riprap and feature a cast in place concrete wall to restore the cover around the pipes to original design conditions. Staff engaged HMCCI to construct the revised
repairs under the existing emergency contract (CSC 51521). Since construction started additional rainfall events has resulted in additional erosion necessitating
increased quantities of rock, flowable fill, embankment. In addition, it was necessary to drill down an average of 7 more feet than anticipated at eath of the 72 pier
locations will support the cap and the wall. Additional engineering is also necessary on the project.
It is understootl antl agreetl that the acceptance of this Change Order by the contractor constitutes an accord and satisfaction and represents payment
in full (both time antl money) for all costs arising out of, or incidental to, the above Change Order.
Contractor's Companv Name
Humphrey & Morton ConsUuction Company, Inc.
Inspector
Director (Water Dep
ch✓is+opher/+qrclbr
Assistant City Attorn
�
M&C Number
21-0284 Funding
Contractor Name
David Humphrey
Date
Date
Apr15,2021
Date
Apr16,2021
� � ,�� ., �� �;.� � _ --:
' �
Project Manager , � , �
Constru ion Supervisor (Water Dept)
Assistant City Manager
T c� 8 �L
Council Action (If
M&C Date Approved
Date
F�� � -
Da e
Date
Date
C�FFI�IAL RECORD
CITY SECRETARY
FT. WORTH, TX
F�RT WC�RTH
City of Fort Worth
Change Order Additions
Project Name Emergency Response - Trinity River Streambank Erosion Affecting two 90-inch Sanitary Sewer City Sec No.: 51521
Project No.(s): Emerency installation of vertical tiebacks DOE No. N/A City Proj. No.: 102346
Project
Description
Emergency Installation of vertical tiebacks and extra depth walls
Contractor Humphrey & Morton Construction Company, Inc. Change Order: �3 Date: 4/14/2021
City Project Mgr. Tony Sholola City Inspector Davitl Johnson
ADDITIONS
DEPT Qty Unit Unit Cost Total
4 Additional work on Change Ortler No. 3 Sewer Unit 1 1.00 LS $1,067,301.95 $1,067,301.95
Sewer Unit 1 $1,067,301.95
Sewer Unit 2
Sewer Unit 3
Page 2 of 4 Additions Sub Total $1,067,301.95
FORT WC3RT�3 City of Fort Worth
Change Order Deletions
Project Name Emergency Response - Triniiy River Slreambank Erosion Affecling hvo 9Qinch Sanilary Sewer Lines City Sec No.: 51521
Project No.(s): Emerency installation of vertical tiebacks DOE No. N/A City Proj. No.: 102346
Project Description
Emergency Installation of vertical tiebacks and extra depth walls
Contractor Humphrey & Morton Construction Company, �nc. Change Order: �3 Date 4/14/2021
City Project Mgr. Tony Sholola City Inspector: Davitl Johnson
ITEM IDESCRIPTION
DELETIONS
DEPT
Qty �Unit �UnitCost
otal
Page 3 of 4
Sewer Unit 1
Sewer Unit 2
Sewer Unit 3
Deletions Sub Total
MIWBE Breakdown for this Chanqe Order
MWBE Sub I Tvqe of Service I Amount for this CO
Total � $0.00
Page 4 of 4
Contract Compliance Manager By signing I acknowledge that I am the person responsible for the monitoring and administration of this contract, including
�
all psorl t reporting requiremenfu.
Signature
Tony Sholola Name of Employee
Assistant Water Director
Title
ATTEST: �g�
Mary J. Kayser
City Secretary
Emergency Bank Stabilization
Change Order No.1
Phase I Original Quantity Items
Phase II Original Quantity Items
Invoice #1
Invoice #2
Invoice #3
Invoice #4
Extras / Overruns Phase I
Flowable Fill
Embankment Overrun
Drilled Piers Overrun
30" Rock Overrun
18" Rock Overrun
39" Rock Overrun
Extras / Overruns Phase II
30" Rock Overrun
18" Rock Overrun
39" Rock Overrun
Site Grading Contingency
Total Amount of All Items Above To Complete Entire Project
Less Original Contract Amount Phase I
Less Original Contract Amount Phase II
Total Amount Remaining (Change Order Request Total)
$
$
Sub Total $
$
$
$
$
Sub Total $
$
$
$
$
$
$
Sub Total $
$
$
$
$
Sub Total $
2, 880, 706.00
326,564.00
3, 207,270.00
59, 760.62
53, 586.60
19, 968.00
20, 000.00
153, 315.22
6, 335.00
111,650.00
498,077.80
24,510.00
139,260.00
19,853.33
799.686.13
42,588.00
10, 829.00
10,883.60
50, 000.00
114, 300.60
$ 4,274,571.95
$ 2,880,706.00
$ 326,564.00
$ (1,067,301.95)
s
v �
� o
U
N
1+
W
b
�
O1
�1
W
�
0
�
rt
n
a
�
ro
w
n
N
7
9J
�
�
S
N
N
�
0
�
�
�
0
�
r*
n
v
�
�
�
n
N
7
�1
0
�
S
N
N
�
�
a
Description of items included in Change Order No.1
Invoice No.1:
Field work performed prior to Bank Stabilization plans by FNI, including test borings for soil analysis,
drilling mob and remob, materials on hand for rebar for the drilled shafts, relocating spoil stockpile for
bypass pumping setup, laboratory analysis by sub (CMJ), and survey for staking location of test bores.
Invoice No.2:
Field work performed prior to Bank Stabilization plans by FNI, including borings along the existing sheet
pile, additional surveying, removal of failed sheet piling on upstream portion of project, installation of
access road along existing sheet piling, and additional archeological investigations.
Invoice No.3:
Due to existing sheet pile failure during construction ofthe Bank Stabilization project, additional field work
was performed, including the securing the failed sheet pile by cutting, re-welding, and re-bracing it to
ensure it remained vertical while remaining construction could continue.
Invoice No.4:
To expedite the construction of the concrete wall within the limits of the failed sheet piling, the sub-
contractor for drilling operations was required to demobilize and then remobilize to the site.
Construction Overruns for Phase I:
• Additional 18", 30" and 39" Rock was required to maintain plan grades. Several major rain/flood
events occurred between the survey and final design timeline. This resulted in significant
riverbanl<erosion and the development of a large depression on the south end ofthe project. The
primary reason for the shortfall was this riverbanl< erosion, large depression, and soft soils. In
addition, because of poor site drainage and the sewer line failure, the base for the rocl< material
became soft and unstable. This soil condition resulted in significant settling of the rock, requiring
more rock to get a firm foundation .
• The additional flowable fill was required due to extensive ground water undermining the new
concrete encased 90-inch pipe creating voids. The flowable fill was placed in the voids to support
the new pipe while construction activities (pier cap, wall and wall drain) in the area continued and
backfill was complete.
• The additional embankment was required to bring the site backto original grade once the existing
90" sewer was repaired. When Circle C finished laying the new 90-inch pipe and concrete
encasement, they could not back fill up to grade because the wall was not in place. Circle C
demobilized and H&M finished the wall. Once the wall was cured, H&M bacl<filled the site where
the pipeline was laid baci< up to grade. The pipe replacement of the failed 90-inch sewer
necessitated this additional worl<, which was not included in the original design/price proposal.
• The concrete wall is supported by a concrete cap and a series of drilled shafts that extend 9' into
underlying rocl<. A profile of the anticipated rock layer was determined based on previously
performed geotech drillings in the vicinity of the new wall and a limited geotechnical analysis
during design. During drilling operations, buried boulders were discovered. These boulders were
at the approximate location of the identified rock layer in the Geotechnical borings. We found
that these boulders were supported by a soil layer which sat on the underlying rock layer and
were not sufficient for the pier cap and wall to bear on. The drilled shafts were extended through
the boulders and into the rock layer the required 9' of penetration, resulting in an overrun. Refer
to attached exhibit and table indicating plan top/bottom of the piers versus actual top/bottom.
Construction Overruns (prolected) for Phase II:
Based on the quantity overruns for the 18", 30" and 39" rocl< riprap experienced during Phase I of the
construction project, an estimate of overruns was determined for Phase II of construction. An additional
site grading contingency is also included to restore the site and provide security measures once
construction is completed. The site grading will consist primarily of shaping a berm to protect the wall and
riprap from direct runoff.
Plan Actual qdditional Depth
Pier No. Depth of
Top Bottom Top Bottom (VF)
Pier
1 474.0 465.0 474.0 12.2 461.8 3.2
2 474.0 465.0 474.0 12.8 461.2 3.8
3 474.0 465.0 474.0 12.8 461.2 3.8
4 474.0 465.0 474.0 13.3 460.7 4.3
5 474.0 465.0 474.0 13.2 460.8 4.2
6 474.0 465.0 474.0 13.7 460.3 4.7
7 474.0 465.0 474.0 13.6 460.4 4.6
8 474.0 465.0 474.0 14.1 459.9 5.1
9 474.0 465.0 474.0 14.2 459.8 5.2
10 474.0 465.0 474.0 14.0 460.0 5.0
11 474.0 465.0 474.0 14.5 459.5 5.5
12 474.0 465.0 474.0 14.0 460.0 5.0
13 474.0 465.0 474.0 14.0 460.0 5.0
14 474.0 465.0 474.0 14.2 459.8 5.2
15 474.0 465.0 474.0 14.3 459.7 5.3
16 474.0 465.0 474.0 14.2 459.8 5.2
17 474.0 465.0 474.0 14.5 459.5 5.5
18 474.0 465.0 474.0 14.3 459.7 5.3
19 474.0 465.0 474.0 14.6 459.4 5.6
20 474.0 465.0 474.0 15.5 458.5 6.5
21 474.0 465.0 474.0 14.3 459.7 5.3
22 474.0 465.0 474.0 16.0 458.0 7.0
23 474.0 465.0 474.0 14.7 459.3 5.7
24 474.0 465.0 474.0 16.3 457.7 7.3
25 474.0 465.0 474.0 24.5 449.5 15.5
26 474.0 465.9 474.0 24.7 449.3 16.6
27 474.0 465.5 474.0 25.6 448.4 17.1
28 474.0 465.1 474.0 25.0 449.0 16.1
29 474.0 464.8 474.0 25.3 448.7 16.1
30 474.0 464.3 474.0 26.2 447.8 16.5
31 474.0 463.8 474.0 25.1 448.9 14.9
32 474.0 463.4 474.0 26.9 447.1 16.3
33 474.0 462.9 474.0 26.6 447.4 15.5
34 474.0 462.5 474.0 26.4 447.6 14.9
35 474.0 462.1 474.0 26.0 448.0 14.1
36 474.0 461.8 474.0 27.8 446.2 15.6
37 474.0 461.4 474.0 27.7 446.3 15.1
38 474.0 460.9 474.0 28.5 445.5 15.4
39 474.0 460.5 474.0 26.3 447.7 12.8
40 474.0 460.1 474.0 26.8 447.2 12.9
41 474.0 459.9 474.0 27.0 447.0 12.9
42 474.0 459.5 474.0 27.0 447.0 12.5
43 474,0 459.1 474.0 28.3 445.7 13.4
44 474.0 458.7 474.0 26.2 447.8 10.9
45 474.0 458.3 474.0 28.1 445.9 12.4
46 474.0 457.4 474.0 26.4 447.6 9.8
47 474.0 456.4 474.0 27.4 446.6 9.8
48 474.0 455.5 474.0 26.2 447.8 7.6
49 474.0 454.5 474.0 25.2 448.8 5.7
50 474.0 453.6 474.0 26.1 447.9 5.7
51 474.0 452.6 474.0 25.3 448.7 3.9
52 474.0 451.7 474.0 26.5 447.5 4.1
53 474.0 450.7 474.0 27.6 446.4 4.3
54 474.0 449.8 474.0 27.3 446.7 3.1
55 474.0 448.8 474.0 28.2 445.8 3.0
56 474.0 447.9 474.0 28.8 445.2 2.7
57 474.0 446.9 474.0 30.0 444.0 2.9
58 474.0 446.0 474.0 29.6 444.4 1.6
59 474.0 445.1 474.0 31.9 442.1 2.9
60 474.0 444.2 474.0 30.2 443.8 0.3
61 474.0 443.1 474.0 32.1 441.9 1.2
62 474.0 442.2 474.0 31.6 442.4 -0.3
63 474.0 441.2 474.0 33.0 441.0 0.2
64 474.0 440.3 474.0 33.7 440.3 -0.1
65 474.0 439.3 474.0 32.2 441.8 -2.5
66 474.0 438.6 474.0 33.9 440.1 -1.5
67 474.0 438.0 474.0 33.8 440.2 -2.2
68 474.0 436.8 474.0 35.6 438.4 -1.6
69 474.0 436.6 474.0 34.4 439.6 -3.0
70 474.0 436.0 474.0 35.0 439.0 -3.0
71 474.0 435.3 474.0 36.3 437.7 -2.4
72 474.0 434.6 474.0 38.1 435.9 -1.3
T"otal AdditiGnal Vertical Depth 481.7
City of Fort Worth, Texas
Mayor and Council Communication
DATE: Tuesday, April 13, 2021 REFERENCE NO.: **M&C 21-0284
LOG NAME: 6051521&53101ADDFUNDING
SUBJECT:
(CD 4) Adopt the Attached Appropriation Ordinance in the Amount of $1,127,093.00 for Increased Project
Costs for the Emergency Sewer Work and Engineering Design for Trinity River Bank Erosion Affecting M-
280-B and M-338-B
RECOMMENDATION:
It is recommended that the City Council adopt the attached appropriation ordinance adjusting receipts and
appropriations in the Sewer Capital Legacy Fund by increasing receipts and appropriations in the
Emergency Sewer Erosion project (City Project No. 102346) in the amount of $1,127,093.00, and by
decreasing receipts and appropriations in the Unspecified project (City Project No. UNSPEC) by the same
amount.
DISCUSSION:
The purpose of this Mayor & Council Communication (M&C) is to provide necessary additional funding for
increased project costs for the Trinity River Bank Slope Stabilization project to protect the two 90-inch
diameter West Fork trunk sewer mains, identified as mains M-280-B and M-338-B.
In the spring of 2016 significant erosion of the Trinity River streambank occurred due to heavy rains and
upstream reservoir releases. The streambank erosion jeopardized the stability of the two 90-inch diameter
West Fork collector sewer lines, which convey a significant portion of Fort Worth's wastewater to the
downstream Village Creek Water Reclamation Facility. An emergency memo was routed on June 7, 2016,
for preliminary bank stabilization while emergency engineering design by DeOtte Engineering
commenced. On September 26, 2017 (M&C C-28407), City Council authorized the execution of a contract
(City Secretary Contract No. 49826) with Humphrey & Morton Construction Company, Inc. (HMCCI), in the
amount of $1,867,535.00, for construction of a reinforced concrete wall with rock gabion baskets to
stabilize the streambank and protect the West Fork collector sewer lines based on the emergency design.
However, additional heavy rains which occurred in the fall of 2018 and spring of 2019 resulted in
additional erosion of the streambank necessitating additional emergency work which both Circle C
Construction Company (City Secretary Contract No. 51472) and HMCCI (City Secretary Contract No.
51521) (10/17/18 emergency memo) were engaged to conduct improvements, consisting of additional
steel sheet pile cutoff wall with anchored tiebacks to reinforce the streambank and provide temporary
support for the collector sewer lines.
The erosion that occurred in 2018 and again in 2019 resulted in substantially changed conditions,
rendering the original DeOtte Engineering design no longer workable, leading to the mutual decision to
terminate City Secretary Contract No. 49826. On April 7, 2020, (M&C 20-0161) the City Council
authorized the termination of City Secretary Contract No. 48926 with Humphrey and Morton Construction
Company, Inc. for slope stabilization of sanitary sewer mains M-280-B and M-338-B. The changed
conditions required additional engineering and design, this time provided by Freese and Nichols, Inc. (City
Secretary Contract No. 53101), including flow deflection structures along the lower portion of the stream
bank to prevent the river from moving towards the twin 90-inch pipes. The upper portion of the stream
bank will be protected with large rock riprap and feature a cast-in-place concrete wall to restore the cover
around the pipes to original design conditions. Staff engaged HMCCI to construct the revised repairs
under the existing emergency contract (City Secretary Contract No. 51521).
Subsequent rainfall events have resulted in additional erosion necessitating increased quantities of rock,
flowable fill, and embankment material. In addition, it was necessary to drill down an average of 7 more
feet than anticipated at each of the 72 pier locations which support the pier cap and wall. Additional
construction assistance is also necessary on the project.
Appropriations for slope stabilization of sanitary sewer mains M-280-B and M-338-B are as depicted
below:
Existing Additional
Fund Appropriations Appropriations Project Total*
W&S Capital
Projects - Fund $2,315,031.00 $0.00 $2,315,031.00
56002
Sewer Capital
Fund - Legacy $17,207.00 $1,127,093.00 $1,144,300.00
59607
Water & Sewer
Bond 2017A- $1,695,823.00 $0.00 $1,695,823.00
Fund 56011
Project Total $4,028,061.00 $1,127,093.00 $5,155,154.00
*Numbers rounded for presentation purposes.
This action will have no effect on the Water Department's operating budget when complete.
The project is located in COUNCIL DISTRICT 4.
FISCAL INFORMATION / CERTIFICATION:
The Director of Finance certifies that funds are currently available in the Unspec Project within the Sewer
Capital Legacy Fund and upon approval of the above recommendation and adoption of the attached
appropriation ordinance, funds will be available in the Sewer Capital Legacy Fund for the HM Twin 90inch
M-280B & M-338B project. Prior to an expenditure being incurred, the Water Department has the
responsibility of verifying the availability of funds.
FUND IDENTIFIERS (FIDs):
u
FRO
IFu
Department ccoun Project Prog
ID ID
Reference # � mou
Chartfield 2)�
Reference # Amou
Chartfield 2
Department ccount' Project Progra
ID 1 ID
ctivity Budget
Year �
ctivity Budget
Year �
CERTIFICATIONS:
Submitted for City Manaqer's Office bv: Dana Burghdoff (8018)
Oriqinatinq Department Head: Chris Harder (5020)
Additional Information Contact: Tony Sholola (6054)
ATTACHMENTS
1. 6051521&53101ADDFUNDING FID Table (WCF 03.10.21).xlsx (CFW Internal)
2. 6051521&53101ADDFUNDING FID Table-Revised.xlsx (CFW Internal)
3. 6051521&53101ADDFUNDING Funds Available.docx (CFW Internal)
4. 6051521&53101ADDFUNDING 59607 A021(r1)r.docx (Public)
5. M& C Map - 6051521 &53101 FUNDING.pdf (Public)
� 11'�� � 1'���1�� �
�a '11�� c. '1���1�� a
v
�
�o
�
�
v
�
v
�
�
v
�o
�
r.
�
�
O �
�. FI
�v
� y
v
ap
� m
� z
� �
�o c
d a
� �
tn
�
n v�
Trn
N �
� Z
-s �
0�0 �
3 �
O
�
�
a�
3 �
o �p'
c y
7
'r Z
�
�
a
c�
a
�
�
�
�
0
�
�
x
�
�o
�
�
O
fD
�
K
v
D
�
�
W
c
a
00
m
�
N
'9
�
�
�,
3
D
3
0
C
7
M
�
�
�
-�
0
�
m
x
-„
�o
�
n
�
n
O
C
3
�
'O
O
fD
n
rr
v
a
�
�
� W
�o c
d Q
� �
m
.+
�
1�1
v
A (A
�
N �
�
�
O
00
3
a
3
0
C
7
�
�
�
�
�
0
�
�