HomeMy WebLinkAboutContract 39677-A2STATE OF TEXAS
COUNTY OF TARRANT
AMENDMENT NO . .1.....:.
TO CITY SECRETARY CONTRACT NO. 39677
§
§ CITY SECRETARY CONTRACT NO. 39677-A2
§
WHEREAS , the City of Fort Worth ("City") and ADS, LLC ("Engineer'') made and
entered into City Secretary Contract No . 39677 (the "Contract") which was authorized by City
Manager on January 15, 201 O; and
WHEREAS , the Contract involves engineering services for the following project:
WHEREAS , it has become necessary to execute Amendment No. __f_ to said Contract to
increase the scope of services and/or the maximum fee .
NOW THEREFORE, City and Engineer, acting herein by and through their duly authorized
representatives, enter into the following agreement that amends the Contract:
1.
Article I, of the Contract is amended to include the additional engineering services
specified in the Engineer's proposal letter dated f,f 4 nd attached hereto. The cost to City for
the additional services to be performed by Engineer total $ 72,355 .00 .
2.
Article II of the Contract is amended to provide for an increase in the maximum 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 not exceed the sum of $116,664 .00.
3.
All other provisions of the Contract which are not expressly amended herein shall remain
in full force and effect.
AMENDMENT NO. 2
CITY SECRETARY CONTRACT NO . 39677 -1-
OFFICIAL RECORD
CITY SECRETARY
FT. WORTH , TX
07 -26 -1 0 Pu·1:5b I N
EXECUTED on this the~f\ay of ~. 2010, in Fort Worth , Tarrant County, Texas .
ATTEST: CITY OF FORT WORTH
Ou~~=~~-
Marty He~ Fernando Costa
City Secretary Assistant City Manager
~~"\i.~~;ti: (\ ". , ,
.(),-<>-~ f0~~8n: L -0 ~~\9 I~, \1:) APPROVAL RECOMMENDED:
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~Us 8!tp ~ """\ o0~ g S. Frank Crumb, P.E., Director Q>,~ Oo oo -r .d v~ .:.,000000° ,cy Water Department
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ll:u~VED AS TO FORM
AND LEGALITY:
ENGINEER:
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TITLE: \ Yo (A S\>,..,(if
AMENDMENT NO. 2,,
CITY SECRETARY CONTRACT NO. 39677 -2-
OFFICIAL RECORD
CITY SECRETARY
FT. WORTH, TX
5" ar ~ ENVIRONMENTAL .. [,,..,_~J. ....... ~--,.,~ -1 SERVICES®
June 29 , 2010
Mr. David Townsend.
City of Fort Worth.
1000 Throckmorton St.
Fort Worth TX 76102
Re: City Of Fort Worth Temporary Flow Monitoring Extensions for 39677
Amendment2
Dear Mr. Townsend
We are pleased to submit our proposal for temporary flow monitoring extensions for the
City of Fort Worth wastewater collection system. We believe we are uniquely qualified ·
to assist you with this project, given our thirty years of experience performing similar
projects.
We look forward to working with you on this and other future projects. Thank you for
the opportunity to propose on your requirements. If you have any questions regarding
this proposal, please do not hesitate to call me at ( 512) 228-6001.
Sincerely,
ADS Environmental Services
Kirk Jones
Business Development Manager
Enclosure
ADS Environmental Services
1413 Deer Ledge Tr. Cedar Park, TX 78613
Tel: 512.228.6001 Fax: 512 .219 .6051 EMAIL: kjones@idexcorp .com
Mr. David Townsend
City of Fort Worth
June 29, 2010
Proposed Scope of Work
ADS Environmental Service ("ADS") will provide a temporary flow monitoring study to
collect 30 days of flow data at eight (8) monitoring locations and then collect 45 days of
flow data at four (4) monitoring locations and extend four (4) monitoring locations for 30
days. One (1) Flow Alert in Walker Branch combiner Vault It will be performed in three
phases as set forth below:
Phase I -Flow Monitoring
1) Flow Monitoring. The monitors are installed and verified to be in working
order, ADS will monitor the flows for a minimum period of 30 and 45 and 30
Days. ("monitoring period"). This initial monitoring period can be extended
based on mutual consent and written agreement of additional work and price for
such additional work.
2) Data Collection and Equipment Maintenance. Field crews will return to each
of the locations during the study to collect the data and perform site maintenance
and site confirmations as necessary. ADS is an ISO 9001 certified company and
has proprietary internal quality procedures for all fieldwork. During the course of
the project and as part of ADS's quality control program, the field manager will
also visit each location and reconfirm that the monitor is in proper working
condition. This includes cleaning depth and velocity sensors, confirmations as
needed, and checking an installation to make sure that the ring is secure in the
pipe. The ADS data analyst will also review the data on a regular basis
throughout the monitoring period.
3) Demobilization. Field crews will continue data collections and confirmations (as
necessary) until the end of the monitoring period. Once authorized, crews will
immediately begin removing the flow monitors and deliver final data to the data
analyst.
Phase II -Data Editing and Reporting
1) Data Analysis. During and upon completion of the monitoring period, a trained
ADS Data Analyst will analyze the data. The analyst's functions include data
editing, quality review, and hydraulic analysis using scattergraphs, field
calibrations and balancing routines to validate the data. The data analyst will
directly calculate flow using the continuity equation from recorded depth and
average velocity data. Flow quantities as determined by the continuity equation
will be plotted. The analyst also will utilize scattergraphs ( depth vs. velocity
readings) to verify monitor accuracy. The data processing and analysis will be
performed on a weekly basis. Any anomalies will be brought to the attention of
the City's Representative.
2) Draft and Final Reports. ADS will provide Final data to the City within 30 days
of the end of the monitoring period ( and any approved extensions). The Final
9S-032 503-0149 Page 2
Mr. David Townsend
City of Fort Worth
June 29 , 2010
1.
data will present a summary of all field and office activities. The data deliverables
will include:
• Final flow data in hard copy and electronic format (hydrographs
including Rain, Velocity, Depth, Qfinal)
• Finalized site reports for monitored manholes
• Daily field logs and maintenance forms
• Depth and Velocity Scattergraph analysis for each site.
• Hydrographs : Hydrographs displaying hourly flow quantit ies (MGD).
• Tabular Reports: Long tables display ing average daily flows (MGD), average depth ,
and daily minimum and maximum values for depth and velocity .
• Final flow data in hard copy and electronic format (hydrographs including, Velocity,
Depth , Qfinal)
• Daily field logs and maintenance forms
• The report will include a hydraulic analysis of the individual flow components and
their impact on the system performance. The report will summarize findings in
tabular, graphical , and narrative formats.
• A capacity analysis will be performed for each monitoring location by comparing the
in-situ capacity with the actual peak hourly flow .
Data Analysis and Final Deliverables
An evaluation of capacity in the metered pipes will be conducted to allow a
determination of the theoretical remaining wastewater flow capacity. The
capacity evaluation method involves the following process:
1. Collect 5-minute interval depth and velocity data points in the pipe over the entire
metering period and determine each pipe's depth vs. velocity relationship or "pipe
curve" based on Manning 's equation (allowing the pipe curve to pass through the
velocity data during the higher flow regime of the day);
2. Determine the typical daily observed peak depth and flow rate in each pipe during
the metering period;
3. Calculate the maximum theoretical unobstructed flow rate for each pipe using the
pipe curve generated in step 1 when each pipe's depth of flow reaches full pipe;
4. Determine remaining capacity (at peak flow conditions), if any, in each pipe by
subtracting the maximum flow rate generated in step 3 from the current typical
peak flow rate generated in step 2 .
9S-032503-01 49 Page 3
Mr. David Townsend
City of Fort Worth
June 29, 2010
5. Compare ratios of current daily peak flow depth to pipe diameter (percent full
based on depth) and current daily peak flow rate to theoretical maximum flow rate
(percent full based on flow rate).
A scattergraph of all the depth vs. velocity data points for each metered pipe is
shown in the Appendix. The free flow operational curves for each pipe based on
the fitted or empirically based Manning's equation is portrayed on the Appendix
scattergraphs. The Manning equation is indicated as equation 4.2. This equation
defines a commonly used theoretical relationship between depth and velocity in
pipes operating under free flow conditions:
V = (He)• R 213 (4.2)
Where,
V = velocity (ft/s).
R = hydraulic radius, defined as wetted area divided by wetted perimeter (ft).
He = hydraulic coefficient -empirically derived from actual data or theoretically
derived as (C • 1/n • S 112) where 'C' is a conversion factor, 'n' is pipe roughness
and 'S' is hydraulic slope.
When a pipe's theoretical hydraulic operating curve is generated from the above
Manning equation based on actual depth and velocity data to generate the factor,
He, the resulting curve is typically termed the "Lanfear-Coll" curve.
Sample
A graphic of the scattergraph for this site is shown in Figure 4.5 wherein the
pipe's theoretical or Lanfear-Coll curve is depicted.
9S-032503-0 I 49 Page 4
Mr. David Townsend
City of Fort Worth
June 29 , 2010
Lanfear-Coll (HC=4.67)
3.0 I\\ \\\\\ 2.5
&atter Graph
VOSS_I A
-
-
--
0.9
0.8
~2.0
!E,
\ \ \
\0
~
~\~ 0.7 -"in -0.6 0
D ...J -
e~
,\_~ : 0.5 ~
Gl
~ 1.5
~ --0.4 0
~ .,
--
0 -
V
i ~~ "---
r----
I I I I
0.3
0.2
0.1
8:825
1.0
0.5
0.0
0 5 10 15 20 25 30 35
DFINAL(in)
Figure 4.-S -Capacity Scattergraph
The curves that extend to the right-hand axis are termed Iso-Q curves and they
depict actual flow rate based on any depth and velocity data point. Under free
flow conditions, this pipe indicates a theoretical full pipe capacity of about 0 .85
mgd (the point where the Lanfear-Coll curve reaches the highest Iso-Q curve).
The typical dry weather daily peak (computed as the highest 30-minute average
flow rate occurring on a non-rainy day) was 0.10 mgd. Thi s indicates that the
typical dry weather peak flow rate operates at about 12% of the pipe 's theoretical
full flow capacity. When depths exceed about 3 inches (i.e. during storm events),
this pipe shows significant backwater conditions or a departure from expected
free flow conditions (i.e . data points depart the free flow Lanfear-Coll curve
shown). The maximum available capacity during such events is generall y only
about 33% of the theoretical full pipe capacity likely due to a downstream
hydraulic restriction.
The typical dry weather peak daily flow depth (the highest 30-minute average
depth) was 2. 7 inches which is equivalent to a depth to diameter ( d/D) ratio of
0.27 or 27% full. However, this pipe surcharged (up to 40 inches deep) during 3
of the 4 study storms, suggesting that any rainfall in excess of 0.5 inch causes
surcharged conditions to develop.
Sample
The scattergraph for this site is shown in Figure 4 .6 showing the pipe 's theoretical
or Lanfear-Coll curve.
9S-032503-0149 Page 5
Mr. David Townsend
City of Fort Worth
June 29, 2010
~atter Graph
VOSS_2A
0.9
0.8
0.7
0.6
Ch
0
;i 1. 5-t--t-1--T-t'
0
0.5 ~ z
~ G)
0.4 9
1.0-+--+A-.... -l-'<-----'S...:---+----+-----+------1----+----I
0.3
0.2
0.1
8:005
Figure 4.6 -Capacity Scattergraph
Under free flow conditions, this pipe indicates a theoretical full pipe capacity of
about 0.85 mgd (the point where the Lanfear-Coll curve reaches the highest Iso-Q
curve). The typical dry weather daily peak (computed as the highest 30-minute
average flow rate occurring on a non-rainy day) was 0.22 mgd. This indicates
that the typical dry weather peak flow rate operates at about 26% of the pipe's
theoretical full flow capacity. When depths exceed about 5 inches (i.e. during
storm events), this pipe shows mild backwater conditions, but able to achieve its
full theoretical full pipe capacity once surcharged to about 25 inches.
The typical dry weather peak daily flow depth (the highest 30-minute average
depth) was 4.3 inches which is equivalent to a depth to diameter ( d/D) ratio of
0.43 or 43% full. However, this pipe surcharged (up to 26 inches deep) during 3
of the 4 study storms, suggesting that any rainfall in excess of 0.5 inch causes
surcharged conditions to develop.
2. Quality Assurance and Quality Control
Our comprehensive Quality Assurance/Quality Control (QA/QC) Program is
unmatched in the industry and will provide a consistent approach to quality to
ensure that all products and deliverables meet project requirements. The program
will address methodologies, work review, frequency and timing of review, review
documentation and distribution, and approval/sign-off requirements. ADS is ISO
9001 certified for manufacturing, field services, engineering and data analysis.
9S-032503-0l 49 Page 6
Mr. David Townsend
City of Fort Worth
June 29, 2010
3.
Because of our ISO 9001 status, ADS follows careful monitoring procedures to
direct the manufacture of state-of-the-art instrumentation and equipment. This
kind of activity, coupled with ADS's continuous efforts to improve field
processes and methodologies, underscores the company 's commitment to provide
high value/high quality products. The Client will be able to draw upon ADS's
ability to bring this industry knowledge to the project. As you will see below,
ADS ' s quality programs are unmatched and result in attaining accurate, reliable flow
and capacity information.
Safety Programs
ADS has an integrated, comprehensive safety process that is headed by a full time
Safety Manager with ten years of ADS experience. The Safety
process encompasses training, audits , equipment and procedures
necessary to meet federal , state and local safety requirements.
Training includes confined space entry certification, personal
protective equipment, blood borne pathogens, gas meter operation,
hazard communication, defensive driving, and first aid/CPR. Field
personnel receive a comprehensive physical examination biannually.
Audits are performed by the Safety Manager and ADS's Industrial
Engineering department.
References for ADS field personnel include our internal and
proprietary Field Safety Manual and a project safety management
Field Safety Manual ~,,,,,,,,,,
AOS EN VIRONMENTAL SERYICES IHC.
notebook. In addition, all project personnel will be specifically trained in any
special local requirements. Each field crew carries all necessary communications,
safety and traffic control equipment. All rigging used for confined space entry
and non-entry retrieval meets or exceeds NFP A specifications.
4. Field Quality Control
The term, confirmation, as ADS uses it, means a manual measurement to develop
statistical confidence in a series of monitor readings . Site confirmations allow ADS
to answer the key quality question: "Does the monitor data reflect what is really
happening in the pipe?" Depth and velocity readings will be taken by a field
technician during installation using devices that are independent of the flow monitor.
Sediment, debris and any other physical characteristics that impact flow will be
noted, measured and recorded. Site verification is the primary quality control
measure ADS will perform on the project and the information will be used as an
independent check of the depth and velocity measurements made by the flow
monitor. ADS will conduct tests during installation and at least one additional time
during this project. After each data collection, ADS will process and review the data
to determine if any problems exist at the sites.
9S-032503-0149 Page 7
Mr. David Townsend
City of Fort Worth
June 29, 2010
ADS'S COMPENSATION
Proposed Pricing
The estimated fee to complete the Project Scope of Work is as follows:=
9S-032503-0 I 49 Page 8
Mr. David Townsend
City of Fort Worth
June 29 , 2010
*Pricing Assumptions: Applicable federal , state, and local taxes excluded ; no M/WBE
participation or prevailing wages included ; no night work or work outside of business
hours ; pricing based on quantities provided .
Task Description (Temp Flo\\ Monitor)
Flow April 21 , 2010 Field investigation, data collection, $31,000.00
Monitoring monitor maintenance for four (8) flow monitors for thirty
(30) days with I serve. on meters ADS-01 , ADS-02 , ADS-
03 , ADS-04 , ADS-05 , ADS-06 , ADS-07 , and ADS-08.
May 22, 2010 Field investigation, data collection,
monitor maintenance for four (4) flow monitors for forty-five $23 ,330.00
(45) days with I serve on meters ADS-01 , ADS-02 , ADS-03 ,
and ADS-04.
July 13 , 2010 Field investigation, data collection,
monitor maintenance for four (4) flow monitors for thirty $15 ,282.00
(30) days with I serve on meters ADS-01 , ADS-02 , ADS-03 ,
and ADS-04.
July 13 , 2010 One (1) Flow alert in Walker Branch $2 ,743.00
Vault
Total* $72,355.00
9S-032503-0149 Page 9
M ~t: Re view
CITY COUNCIL AGENDA
DATE:
CODE:
COUNCIL ACTION: Approved on 7/13/2010
711312010 REFERENCE
NO.:
C TYPE:
**C-24319 LOG NAME:
PUBLIC
CONSENT HEARING:
Page 1 of2
Official site of the City of Fort Worth, Texas
FORT\VORTH
~
60VCVVWTP FLOW
MONITORING AMEND2
NO
SUBJECT: Authorize Amendment No . 2 in the Amount of $72 ,355.00 to City Secretary Contract No .
39677 , an Agreement with ADS , LLC for Village Creek Wastewater Treatment Plant
Influent Mains Temporary Flow Monitoring (COUNCIL DISTRICT 5)
RECOMMENDATION:
It is recommended that the City Council authorize the City Manager to execute Amendment No . 2 in
the amount of $72,355.00 to City Secretary Contract No. 39677 an Agreement with ADS, LLC for
Village Creek Wastewater Treatment Plant Influent Mains Temporary Flow Monitoring thereby
increasing the total contract price to $116 ,664.00 .
DISCUSSION:
On January 15, 2010, an agreement was executed with ADS, LLC for the temporary flow monitoring
of the influent sewer flows in the Village Creek Wastewater Treatment Plant (VCVVWTP). The staff
wanted to conduct temporary flow monitoring on the four major sanitary sewer mains flowing into the
VCVVWTP to examine the changing flow characteristics' that have occurred since the new Trinity
River Siphon has gone into service during normal and wet weather flows . Amendment No. 1 added
temporary flow monitoring at four more locations on sanitary sewer mains on the west side of Lake
Arlington to assist in determining the reason for sanitary sewer overflows into the lake .
Amendment No. 2 will extend the temporary flow metering for the 105 days to verify the results of the
first 30 days .
The temporary flow monitoring on the major sanitary sewer mains flowing into the VCVVWTP show a
discrepancy between the total flow into the VCVVWTP recorded on the temporary flow meters and the
influent plant meters . The additional temporary flow metering will verify whether the VC\/VWTP
influent meter is recording the correct amount. The sanitary sewer overflows into Lake Arlington were
stopped with the removal on construction debris. The additional temporary flow monitoring in this
area will assist in calibration of the Sewer Model as part of the Sewer Master Plan Sewer Model to
determine when in the future that sanitary sewer overflows into the Lake Arlington could occur and as
part of the Sewer Master Plan develop and recommend a timely solution to prevent the sanitary
sewer overflow . The cost of the extension is $72,355.00.
A waiver of the goal for M/WBE subcontracting requirements was requested by the Water
Department and approved by the M/WBE Office because the purchase of goods or services is from
source(s) where subcontracting or supplier opportunities are negligible.
This project is located in COUNCIL DISTRICT 5.
FISCAL INFORMATION/CERTIFICATION:
.. The Financial Management Services Director certifies that funds are available in the current operating
budget , as appropriated, of the Water and Sewer Fund .
TO Fund/Account/Centers FROM Fund/Account/Centers
PE45 539120 0705007 72 355 .00
http ://apps.cfwnet.org/c ouncil_packet/mc _review.asp?ID= 13809&councildate=7/13/2010 07/26/2010
-M~,.., Review
Submitted for City Manager's Office by:
Originating Department Head:
Additional Information Contact:
ATTACHMENTS
Fernando Costa (6122)
S . Frank Crumb (8207)
David Townsend (8430)
60VC\MNTP FLOW MONITORING AMEND2 MAP . df
http://apps.cfwnet.org/council _packet/me _review .asp?ID= 13 809&councildate=7/13/2010
Page 2 of2
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