HomeMy WebLinkAboutContract 42008-A1 CITY SECRETM." 00S7 '4--1
CONTRACT NO.
AMENDMENT No. 1
TO CITY SECRETARY CONTRACT No. 42008
WHEREAS, the City of Fort Worth (CITY) and Jacobs Engineering Group
Inc. (ENGINEER) made and entered into City Secretary Contract No.
42008, (the CONTRACT) which was authorized by M&C C-24963 on the 20 day
of July, 2011 in the amount of $ 212, 357 . 00; and
WHEREAS, the CONTRACT involves engineering services for the
following project:
Summerfields Creek Master Plan Study No. SWS-024; and
WHEREAS, it has become necessary to execute Amendment No. 1 to the
CONTRACT to include an increased scope of work and revised fee.
NOW THEREFORE, CITY and ENGINEER, acting herein by and through their
duly authorized representatives, enter into the following agreement,
which amends the CONTRACT:
1.
Article I of the CONTRACT is amended to include the additional
engineering services specified in a proposal dated December 10, 2014, a
copy of which is attached hereto as shown as Attachment "A" and
incorporated herein. The cost to City for the additional design services
to be performed by Engineer totals $36,608 as shown on Attachment "B".
(See Attached Funding Breakdown Sheet, Page -3-)
2.
Article II of the CONTRACT is amended to provide for an increase in
the fee to be paid to Engineer for all work and services performed under
M the Contract, as amended, so that the total fee paid by the City for all
M work and services shall be an amount of $248,965.
_m
C
M 3.
All other provisions of the Contract, which are not expressly
amended herein, shall remain in full force and effect.
EXECUTED and EFFECTIVE as of the date last written by a signatory,
below.
City of Fort Worth
Professional Services Agreement Amendment Template OFFICIAL RECORD
PMO Official Release 8/1/2012
Page 1 of 2 CITY SECRETARY
FT. WORTH, TX
APPROVED:
City of Fort Worth ENGINEER
Jacobs Engineering Group Inc.
Fernando Costa Scot Sanders
Assistant City Manager Manager of Operations
DATE: DATE: IL /141 L
APPROVAL RECOMMENDED:
C-0 f� a/? C-)-
Douglas W Wiersig, Ph. . , P.E.
Director, Transportation/Public Works Department
APPROVED AS TO FORM AND LEGALITY: M&C: 'Z' 4
Date:
Douglas W. Black
Assistant City Attorney
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Mary J. Kayser o,
City Secretary �� °°00000 °° *a
City of Fort Worth OFFICIAL RECORD
Professional Services Agreement Amendment Template
PMO Official Release 8/1/2012 CITY SECRETARY
Page 2 of 2
FT. (WORTH,TX
Attachment "A"
Amendment No. 1
December 10, 2014
City of Fort Worth Storm Water Utility
Summerfields Creek Master Plan
Study No. SWS-024
Scope of Work
SECTION I - PROJECT DEFINITION
The objective of the original scope was to perform an open channel study on the Summerfields
Creek(BFC-1) Master Plan. Services included creating a detailed hydrologic model of the
watershed, performing detailed hydraulic modeling and floodplain mapping of stream BFC-1 and
one of the tributaries, stability and erosion assessment of the stream, an improvements master
plan for flood prevention, a roadway overtopping hazard assessment, and developing
preliminary scope of work for recommended minor projects along the stream.
In the process of performing the work, the City of Fort Worth revised their design standards/
methodologies, and added several additional scope items which are addressed in this
amendment. The purpose of this amendment is to incorporate the revised
standards/methodologies and the additional scope items. This will allow for the study to be
consistent with all other City watershed studies.
SECTION 11 — BASIC SCOPE OF SERVICES
Background
The original contract stated that TR-55 equations and curves for estimating the time of
concentration for overland flow, shallow concentrated flow, and channel flow shall be used for
this study. After work began and nearly completed the City of Fort Worth Stormwater
department revised their standards for estimating shallow concentrated flow within curb and
gutters. The City has requested that Manning's equation for channel flow be used where time of
concentration flow paths flow along curb and gutter instead of the TR-55 equations. The City
also requested additional scope items requiring flow change locations be revised from what was
requested in the original scope of work.
Proposed Work
Initially, the TR-55 equations and curves for estimating the time of concentration were
applicable to curb and gutter flow and shallow paved concentrated flow. After the 75% review of
work, it was suggested that instead of TR-55 equations, Manning's equation for open channel
flow shall be used to calculated the time of concentration within curb and gutter sections.
Revising the time of concentration estimates and flow change locations will result in changes to
discharge, water surface elevations, and floodplain mapping. After re-calculating the time of
concentrations, the HEC-HMS model of the watershed will need to be revised as well. Peak flow
estimates for the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year return events will be calculated in
HEC-HMS. Report and exhibit tables will be revised to reflect the hydrologic changes.
Once the revised peak flow estimates are verified, the flow data table within HEC-RAS will be
revised as well. Revised WSELs, water surface extents, and floodway extents will be re-
calculated in HEC-RAS. Floodplain and floodway maps and report tables will need to be revised
to reflect the changes in WSELs and extents as well.
Also after the 75% review, it was requested that the hydrologic junctions be moved. In the
original contract under Task 4 Part b. Flow Data, it states that outflow from a subbasin should
be proportionally inserted at 1/3 or 2/3 of the channel segments. The City would now prefer to
have the hydrologic junctions in HEC-HMS match the flow change locations in HEC-RAS
instead of proportioning the junction outflow throughout the basin.
Additional time will need to be spent on QA/QC throughout the revision process.
Deliverables
The following deliverables were required for this task:
1. Revised Report text, tables, and exhibits
2. Revised Floodplain Maps
Assumption
The following assumptions will be applied for the final submittal:
1. RSG guidelines should be used as a reference as needed, but formatting should at least
follow the original contract guidelines.
2. Electronic submittal can occur at each step of the revisions for City review and approval.
3. A meeting will occur prior to starting the Flood Mitigation Alternative Analysis. Once this
portion of the study is complete, Jacobs will submit a Final report in hard copy form.
4. There will not be a public meeting as stated in the original contract.
End of Attachment A
dtants Total Total Task
Task Task 2-Man Labor Expense Sub
No. Description :f Crew Cost Cost Total
140.4
Task 3 Detailed Hydrologic Models
a. Rainfall $0 $0 $0
b. Data Sources/Processing $0 $0 $0
C. Model Development $13,094 $242 $13,336
d. Routing Reaches $2,604 $242 $2,846
e. I Depth AFea Agaly&is $0 $0 $0
f. Compare Model Results $2,398 $187 $2,585
Task 4 Hydraulic Models/Flood lain Mapping
a. Model Development $8,232 $132 $8,364
b. Peak Flow Data $0 $0 $0
C. Model Results/Mapping $6,947 $345 $7,292
Task 7 QA/QC Procedures
a. QA/QC Procedure Development $0 $0 $0
b. QA/QC Reviews/Documentation $2,031 $154 $2,185
Total Pro'eci 0 323 Hours
Total Project Labt $0 $35,306 $1,302 $36,608
Att B LOE for Summerfields Amd1 12/10/2014