HomeMy WebLinkAboutContract 39677-A1STATE OF TEXAS
COUNTY OF TARRANT
AMENDMENT NO._L
TO CITY SECRETARY CONTRACT NO. 39677
§
§ CITY SECRETARY CONTRACT NO. 39 lo]]-~\
§
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: Village
Creek WWTP Influent Mains Temporary Flow Monitoring
WHEREAS, it has become necessary to execute Amendment No. _1_ 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 February 22, 201 O and attached hereto. The
cost to City for the additional services to be performed by Engineer total$ 19,783.00.
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 $ 44,309.00
-1-
OFFICIAL RECORD
CITY SECRETARY
FT. WORTH, TX
3.
All other provisions of the Contract which are not expressly amended herein shall remain
in full force and effect.
Q-t-rJ\.. ' EXECUTED on this the ___ day of ~. 2010 , in Fort Worth , Tarrant County,
Texas.
ATTEST:
l'N~ MartyH~
City Secretary
CITY OF FORT WORTH
Fernando Costa ,
Assistant City Manager
APPROVAL RECOMMENDED:
~dttr1~
S. Frank Crumb, P.E., Director
Water Department
ENGINEER:
TITLE: :TY'~
-2-OFFICIAL RECORD
CITY SECRETARY
FT. WORTH, TX
i
,
!F4 t:J T ~ ENVIRONMENTAL .. £~~1....-.'f: .... -.,_ -1 SERVICES•
February 22, 2010
Mr. Andy Cronberg
City Of Fort Worth
1000 Throckmorton
Fort Worth TX 76102
Re: City Of Fort Worth Temporary Flow Monitoring
Dear Mr. Cronberg:
We are pleased to submit our proposal for temporary flow monitoring 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
-,
l\1r.J\ndyCronberg
City Of Fort Worth
February, 22 2009
Proposed Scope of Work
ADS Environmental Service ("ADS") will provide a temporary flow monitoring study to
collect 30 days of flow data at four ( 4) monitoring locations. It will be performed in three
phases as set forth below:
Phase I -Mobilization
l) Kick-off Meeting. Phase I will begin with a kick-off meeting between
representatives of the Client and ADS. The purpose of the kick-off meeting is to
discuss project scope, establish lines of communication, set milestones, and set
the project schedule.
2) Site Locations. ADS will work with the Client to identify/verify the location of
monitor installations.
3) Site Investigations. Once the installation sites are provided to ADS, ADS field
crew(s) will perform site investigations. ADS will utilize a standard 2-person
field crew for fieldwork and comply with Federal standards for confined-space
entry. The proposed flow monitoring locations will be located, inspected, and
verified for hydraulic suitability. ADS will also check for debris in the manhole
that could impact data quality and coordinate any required cleaning efforts with
the Client or the City. ADS field crews will look for evidence and signs of erratic
flow patterns. ADS will also investigate adjacent manholes in order to identify
the best monitoring locations.
4) Site Reports & Safety Plan. Site reports will be generated upon completion of
the site investigations. The site reports will include a sketch of the general
location, physical characteristics and diameters of the proposed monitoring
locations, manhole depths, and flow measurements. A "Site Safety Plan" will also
be completed as part of the site investigation phase of the project, this will include
comments pertinent to the monitoring location such as any special traffic or safety
issues. Final site locations to be approved by the Client.
5) Equipment. ADS will ut11ize the ADS® Model F lowShark wireless flow monitor
during the course of this project. A typical monitor installation will include an
ultrasonic depth sensor that will be mounted at the crown of the pipe; a redundant
pressure depth sensor mounted at the invert; and a Doppler velocity sensor also
mounted at or near the invert.
6) Monitor Activation. Once installed, the monitor will be activated and set to take
readings at 15-minute intervals. ADS Field crews will take manual depth
readings with a ruler and velocity readings with a portable, instantaneous velocity
meter in order to confirm the monitor is collecting accurate data based on the
actual existing hydraulic conditions at each location.
9S-032503-0149 Page2
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Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
Phase II -Flow Monitoring
1) Flow Monitoring. Once the monitors are installed and verified to be in working
order, ADS will monitor the flows for a minimum period of 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 900 I 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 III -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
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 Scattergrapb analysis for each site .
• Hydrographs: Hydrographs displaying hourly flow quantities (MGD).
9S-032503-0/49 Page 3
Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
1.
• Tabular Reports: Long tables displaying 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 m step 2.
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
9S-032503-0149 Page 4
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Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
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.
Lar1ear-Col (l-0= 4. 67)
&:atter Graph
VOSS_IA
::~! \ \~\ \~ \~;;:t:::::::=:=::t:::::::::::::t::::=:::::=t:::::===:l=====I~= 0.9
~ \\I ~---+-----1---t----+----+----e= 0.8
-2.o+-:,-.1+-+-+-+-'........,,,---,...~-+----+-----1----+----+-----1---11 0.7 ! 1 5 ~ \ )f .\ ~-----+----+----t----+----+--0.6 !
z · ~ \ "'-0.5 ~
""'-. -0.4 ~
1.0-__ -~ V _ -+-----<>+-----+---+-----+-----+--=--0.3
0
0 ~ ----1------=-----+-----+----i--,ov~----+-----+--=I 0.2
.v J -\_ .~;:::-----+---r-----+----+---r-----+----11-0.1
o.o-tv,J.' .J'-"'--=..1 II l:ci;i;;q;i;;;i;;i;i;;µ;;i;;;i;;i;;$c;i;;i;l;;i;;c;i;;µ;i;c~~~ 8:825
0 5 10 25 35
Figure 4.5 -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
9S-032503-0149 Page 5
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Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
"' E.
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. This 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 generally 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 (dlD) 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.
Scatter Graph
VOSS_2 A
0
2.o+-++-+--'1----\-i:*--',----<>t--__,,_t------+---w.+----+-----li-----fl
0.9
0.8
0.7
0.6 ~
0
0.5 ~ ~ 1. :>-t----t-t--t--T z
~
1.
G)
0.4 9
0.3
0.2
0.1
8:~
0 5 10 15 20 25 30
CFINAL (n )
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
9S-032503-0149 Page 6
r ,
rvfr . .AndyCronberg
City Of Fort Worth
February, 22 2009
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 (dlD) 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
3.
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.
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 ha:s-an integrated, comprehensive safety process that 1s 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 .,,,,,,,,,,
ADSE1Ml!ON1101TAL SUMCD 1HC.
notebook. In addition, all project personnel will be specifically trained in any
9S-032503-0/49 Page 7
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Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
4.
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.
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.
A DS 'S COMPENSATION
9S-03 2503 -0/49 Page 8
I
Mr. Andy Cronberg
City Of Fort Worth
February, 22 2009
Proposed Pricing
The estimated fee to complete the Project Scope of Work is as follows:
*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
Ta,k llc,uiption ( Fl«m \lonitor Stud~)
Flow Field investigation, data collection, monitor maintenance for $19,783.00
Monitoring four (4) flow monitors for thirty (30) days with I serve.
Total* $19,783.00
hours ; pricing based on quantities provided .
9S -03 2503-01 49 Page9