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RECEIVED CITY SECRETARY
FEB -8 2019 AMENDMENT No.02 CONTRACT NO., - a
CITY OF FORT WORTH
CITY SECRETARY TO CITY SECRETARY CONTRACT No. 49049
WHEREAS `f the City of Fort Worth (CITY) and CDM Smith, Inc,
(ENGINEER) made and entered into City Secretary Contract No. 49049, (the
CONTRACT) which was authorized by M&C C- 28213 on the 2nd day of May,
2017 in the amount of $ 1, 570, 965 . 00; and
WHEREAS, the CONTRACT involves engineering services for the follow-
ing project :
VILLAGE CREEK WATER RECLAMATION FACILITY GRIT REMOVAVL PROCESS; and P
WUEREAS, the CONTRACT was subsequently revised by Amendment 01 in
the amount of $885, 755 which was authorized by M&C C-28857 on September
18 , 2018; and
WHEREAS, it has become necessary to execute Amendment No. 2 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 January 14, 2019, a
copy of which is attached hereto and incorporated herein. The cost to
City for the additional design services to be performed by Engineer
totals $ 71, 993. (See Attached Scope of Services, Fee Table and related
Exhibits)
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
the Contract, as amended, so that the total fee paid by the City for all
work and services shall be an amount of $2,528, 713.
3 .
All other provisions of the Contract, which are not expressly
amended herein, shall remain in full force and effect .
Ci tyof Fort Worth,Professional Services Agreement Amendment ®FF9� � r z
,
CFW Official Release 9/19/2017;Adapted February 2019 Page 1 of 2
L _.
FT. WORTHP T
EXECUTED and EFFECTIVE as of the date last written by a signatory, below.
APPROVED:
City of Fort Worth ENGINEER
CDM Smith Inc.
Jesus J. Chapa J. Danny Shannon, PE
Assistan`t� City Manager Senior Vice President
DATE: ? DATE:
APPROVAL RECOMMENDED:
Christopher P. Harder, PE M&C : NI �
Director, Water Department Date:
APPROVED AS TO FORM AND LEGALITY:
Douglas W. Black
Assistant City Attorney
ATTEST.
�g• �
Mary J. Kayser - '' � r'
City Secretary
Contract Compliance Manager:
By signing, I acknowledge that I am the person responsible for the monitoring
and administration of this contract, including ensuring all performance and
reporting requirements .
Farida Goderya, PE
Senior Project Manager
City of Fort Worth,Professional Services Agreement Amendment OFFICIAL RECORD
CFW Official Release 9/19/2017;Adapted September 2018 CITY 56 "ARyY
FT. WORTH,TX
City of Fort Worth
Departmental Request for Waiver
of MBE/SBE Subcontracting/Supplier Goal
Water $72,000.00 01/14/2019
DEPARTMENT NAME: ESTIMATED COST / PROPOSAL DATE
(Please check the appropriate box below)
()RFP ()RFQ ()RFI ()CISV ()Other State Cooperative Program ()Reverse Auction
NOTE:All support documentation needs to be attached to this request.
Village Creek WRF Grit Removal Process 100075
NAME OF PROJECT /BID DOE/PROJECT NO.
Farida Gode a Digitally signed by Farida Goderya
ry Date:2019.01.24 10:31:46-06'00' 8214 01/24/2019
SIGNATURE OF PROJECT MANAGER EXTENSION DATE NIGP CODE
Prior to advertisement, the contracting/managing department shall determine whether the bid/RFP is one which MBE/SBE
requirements should not be applied. MBE/SBE requirements may be waived upon written approval of the M/WBE Manager. If one
of the conditions listed below exists, the contracting/managing department shall notify the Manager via this form, stating the specific
reason(s)for requesting a waiver.
If the contracting/managing department and the Manager are in conflict over the granting of a waiver, either
may appeal to the City Manager, or designee, whose decision is final.
Please Check Applicable Reason:
A. MWBE Office: A waiver of the goal for MBE/SBE subcontracting requirements was requested
by the Department and approved by the MWBE Office, in accordance with the MWBE or BDE
Ordinance, because the public or administrative emergency exists which requires the goods or
services to be provided with unusual immediacy; or
B. MWBE Office: A waiver of the goal for MBE/SBE subcontracting requirements was requested
by the Department and approved by the MWBE Office, in accordance with the MWBE or BDE
Ordinance, because the purchase of goods or services is from sources where subcontracting or
supplier opportunities are negligible; or
C. MWBE Office: A waiver of the goal for MBE/SBE subcontracting requirements was requested
by the Department and approved by the MWBE Office, in accordance with the MWBE or DBE
Ordinance, because the application of the provisions of this ordinance will impose an economic
risk on the City or unduly delay acquisition of the goods or services; or
D. MWBE Office: A waiver of the goal for MBE/SBE subcontracting requirements was requested
by the Department and approved by the MWBE Office, in accordance with the MWBE or DBE
Ordinance, because the MWBE Waiver is based on the sole source information provided to the
MWBE Office by the managing department's project manager.
E. OTHER:
Justify Commodity or Service Waiver Request:
Physical modeling of the new proposed facility is a very specialized professional work and will be performed by the listed non-SBE sub-consultant.
(CEH)on the project. Therefore,there are no SBE subcontracting opportunities on the Amendment No.2.
Please use additional sheets,if needed
M/WBE OFFICE USE ONLY:
Gwen Wilson Digitally signed by Gwen Wilson
Date:2019.01.29 14:33:04-06'00' 01/29/2019
Approved Signature of M/WBE Authorized Personnel Date
Not Approved Signature of M/WBE Authorized Personnel Date
Rev.2-27-18
CDM
Smith
801 Cherry Street,Unit 33,Suite 1820
Fort Worth,Texas 76102
tet:817 332-8727
January 14,2019
Farida Goderya,PE,PhD
Fort Worth Water Department
200 Texas Street
Fort Worth,Texas 76102
Subject: Village Creek Water Reclamation Facility Grit Removal Process
City Project No. 100075; CSC#49049
Amendment No. 2 Proposal
Dear Farida:
Enclosed is CDM Smith's proposal to provide physical modeling to investigate the grit facility
influent splitter box configuration and the tie-in to the Headworks Facility.CDM Smith currently
has physical modeling in our scope of work to optimize the grit facility layout to maintain equal
flow split between the HeadCell®units and to optimize hydraulic assumptions to maintain headloss
within 4-ft through the facility.Additional modeling efforts is necessary to investigate the influent
splitter box.
Following our 30 percent design review workshop,CDM Smith and City staff discussed the shared
concern regarding the placement of the grit removal facility within the plant's existing gravity
hydraulic profile and the operational challenges that may result.
Flow from the wastewater collection system enters VCWRF at two locations and flows by gravity
through the Headworks Facility to the primary clarifiers.Primary effluent flow is then pumped to
downstream treatment processes.The hydraulic profile at the Headworks Facility is set by the
primary clarifier effluent weir.There is approximately 11-ft of available hydraulic head between
the primary clarifiers and the Headworks Facility effluent box.The HeadCell effluent weir is set
based on the water surface elevation(WSE) in the headworks effluent box.Based on the required
HeadCell unit configuration,the influent channel elevation is set to be approximately 11-ft above
the Headworks Facility finished floor elevation.See attached Drawing G-6 showing the grit facility
hydraulic profile and associated weir/channel elevations.
The concern and operational challenges VCWRF may face is the idea that the 11-ft wall (step-up)
from the Headworks Facility to the common grit influent channel may affect grit removal during
low to average flow conditions and cause grit accumulation in the headworks or grit influent box
during low to average daily flow.As flow increases the settled grit may overwhelm the grit removal
units and cause plugging and other maintenance issues to the grit handling equipment
WATER+ENVIRONMENT+TRANSPORTATION+ENERGY+FACILITIES I
CDM.
Smith
Farida Goderya,PE,PhD
January 14,2019
Page 2
CDM Smith has discussed with Hydro International (HI)the idea of lowering the HeadCell units to
match the influent channel elevation with the Headworks finished floor elevation.HI has reviewed
the information and is not comfortable with this approach of submerging their units 11-ft under
water.Their unit is not designed to accommodate this submergence and the impacts are unknown.
They do not want to add unknown risk to this installation as this will be their largest US
installation.
CDM Smith has review many conceptual ideas to possibly reduce the effect of the hydraulics.Ideas
include looking at other grit removal technologies and locating the grit removal system closer to the
primary clarifiers.Unfortunately,none of these options appeared to provide enough benefit to
investigate further.
CDM Smith proposes to perform additional physical modeling of the grit influent splitter box and
connection to the Headworks Facility to find a reasonable configuration that will minimize grit
removal impacts.The configuration that will be analyzed is to lengthen the splitter box and slope
the floor of the splitter box from the Headworks Facility Flow Diversion Box to the Common Grit
Influent Channel.A drawing is attached to show the concept In addition to the structure changes,
CDM Smith proposes to investigate a water jet system to install nozzles at proper spacing up the
sloped floor to help moving grit into the common grit influent channel.
Attached is our breakdown of activities that will occur during this additional modeling effort as well
as Clemson Engineering Hydraulics (CEH) proposal to construct and investigate the jet system.As
mentioned before,CDM Smith has physical modeling already in our scope of work and is identified
at the bottom of the spreadsheet as a deduction to the budget for the physical modeling.The total
cost to investigate the splitter box configuration and jet system is$71,993.This included travel time
to CEH warehouse to witness the physical model testing.This cost does not include modeling the
Phase 2 grit units.If the City desires to model Phase 2 grit units,the cost will be an additional
$20,000.
The design progress is dependent on the completion of the physical modeling and is therefore the
critical path to design.Please Iet me know if you have any questions.
Sincerely,
�obtin8vv.�
Amy Robinson,PE
Senior Project Manager
CDM Smith Inc.
cc: Douglas Varner,CDM Smith
elf
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