HomeMy WebLinkAboutC2011-452 - 11/20/2011 - NACITY OF CORPUS CHRISTI
AMENDMENT NO. 1
CONTRACT FOR PROFESSIONAL SERVICES
The City of Corpus Christi, Texas hereinafter called "CITY ", and LNV Inc., hereinafter called
"ENGINEER," agree to the following amendment to the Contract for Professional Services for Elevated
Water Storage Tanks City-Wide Project No. 8651), as authorized and amended by.
Ori final A/E Agreement I February 10, 2009 1 Motion M2009 -032 1 $ 705,242.00
Exhibit "A " . SECTION 1. SCOPE OF SERVICES PART B. ADDITIONAL SERVICES shall be
amended to re-align additional services as follows:
• ITEM NO. 5 CONSTRUCTION OBSERVATION SERVICES
• TEM NO. 11 2025 SCENARIOS AND SURGE ANALYSIS — ACR FOR ELEVATED STORAGE
In the original contract, EXHIBIT "A ", SUMMARY OF FEES shall be modified and is attached as
Amendment No. 1 Exhibit "A" for a revised fee not to exceed $0.00 Zero Dollars and zero cents), for a
total restated fee not to exceed $705,242.00 (Seven Hundred Five Thousand Two Hundred Forty
Two Dollars and zero cents).
All other terms and conditions of February 10, 2009 contract between the City and Consultant will remain
in full force and effect.
CITY OF CORPt
H ISTI
Juan Perale Jr., P.E. Date
Assistant City Manager
RECD MENDS
Pete Anaya, .E. Date
Director of Engineering Services
ATTEST
Armando Chapa, City Secretary
LNV,
J P. I0/i/ l ?
Din S. Leyendecker, P.L.
'resident
801 Navigation, Suite 300
Corpus Christi, TX 78408
(361) 883 -1984 Office
(361) 883 -1986 Fax
E E EKED
APPROVED AS TO FORM
li
A sistant Attorney Date
2011 -452
11/20/11
Project Number: 8651
Fund Source: 550950- 4477 - 00000 - 180203
Encumbrance Number: F CoS
AMEND. NO. 1
Page 1 of 1
, 1 ELEVATED WATER STORAGE TANKSL4MENDMENT NO. 16AMENDMENT NO. 1.DOCX
LNV Inc. INDEXED
ENV
engineers I architects I Contractors
Solutions Today with a
Vision for Tomorrow
October 7, 2011
Mr. Pete Anaya, P.E.
Director of Engineering Services
City of Corpus Christi
Engineering Services
P.O. Box 9277
Corpus Christi, TX 78469 -9277
Re: AMENDMENT NO. 1 TO PROFESSIONAL SERVICES CONTRACT
ELEVATED WATER STORAGE TANKS CITY -WIDE, CITY PROJECT NO. 8651
(LNV PROJECT NO. 090024.001)
Dear Mr. Anaya:
In response to the City's request, we are proposing the following "no cost" amendment for
additional services associated with the Elevated Water Storage Tanks — City Wide project (City
Project No. 8651),
Project Description:
The City of Corpus Christi, Texas, hereinafter called "City ", and LNV, Inc. hereinafter called
"Engineer", agree to the following Contract for Additional Services associated with the above
referenced project. This effort includes providing the City and Texas Commission on
Environmental Quality (TCEQ) with the additional water system analysis and modeling
methodology and assumptions as a result of the July 8, 2011 meeting with TCEQ in an
Engineering Letter Report with the purpose of determining proper elevated storage tank
locations and providing an implementation plan for constructing the elevated storage tanks as
required up till 2025. The configuration of elevated storage tanks as determined in this project
will also be used to support the City's request for an Alternative Capacity Requirement (ACR)
for elevated storage in the City's distribution system. These services were requested by the
Operating Department.
Scope of Services:
The Scope of Services for this contract is comprised of the following tasks:
A. Basic Services
1.
Preliminary Phase — TBD.
2.
Design Phase — TBD
3.
Bid Phase — TBD
4.
Construction Phase — TBD
B. Additional Services
1. Permitting -- TBD.
2. Right -of -Way (ROW) Acquisition Survey — TBD.
3. Topographic Survey — TBD
AMEND. NO. 'I
EXHIBIT "A"
Pa e 1 of 7
4. Environmental Issues — TBD.
5. Construction Observation — TBD
6. Start -up Services — TBD
7. Warranty Phase — TBD
8. Provide SCADA Documentation — TBD
9. Siting Evaluation and Recommendations — TBD.
10. Pressure and Water Age Evaluation — TBD.
11. 2025 Scenarios & Surge Analysis — ACR for Elev. Storage
i) Provide the additional modeling effort to include the Year 2025 scenario.
This scenario will include all 2025 Elevated Storage tanks.
ii) Provide 2025 demand projections and include the results of the four (4)
scenarios requested by TCEQ and described in further detail in Sections
11.1 -11.4 below for the future 2025 demand conditions.
11.1 Modeling Requirements
i) Apply growth projection analysis to identify the Average Annual Demand
(AAD) for each customer by projecting the current demands to the year
2025. This will be determined by analyzing the estimated projections
obtained from the 2006 Texas Water Development Board's (TWDB's)
Regional Water Planning Data.
ii) Calculate the projected maximum daily demand (MDD) and peak hourly
demand (PHD) based upon the trend found above by applying factors
historically determined from water department records and TCEQ Rules
and Regulations to the demands allocated in the existing model. For the
Purpose of this ACR, TCEQ has allowed the City to exclude the demands
associated with STWA, NCWCID#4, and SPMWD since the system does
not provide_ pressure maintenance for these systems.
iii) Based on an 18.4% increase in water demands calculated from the
TWDB's Regional Water Planning Data, the following forecasted
demands will be allocated to the model:
Demand
Existing*
Yr 2025*
Average Annual Demand
43,300 gpm
52,050 gpm
AAD
63 MGD
75 MGD
Peak Hour Demand
114,650 gpm
136,700 gpm
PHD
166 MGD
197 MGD
1.5 gpm 1 Connection
185,100 gpm
219,900 gpm
Demand
267 MGD
317 MGD
* Demands exclude wholesale customers (STWA, NCWCID#4, and SPMWD)
which the City does not provide pressure maintenance for. The demands also
do not include the Padre Island Pressure Zone which receives pressure
maintenance from the Sand Dollar Pump Station.
iv) Geographically allocate the additional demands to the forecasted growth
areas indicated by the 1995 -2008 platting data in the City's Draft Water
Transmission Master Plan. Meet with the City's planning department to
confirm areas of population growth.
AMEND. NO. 1
EXHIBIT "A"
Page 2 of 7
11.2 2025 System Simulation at Peak Hour Demand (PHD) during Normal
Operating Conditions
This task addresses the following comment in the April 6, 2009 letter from TCEQ.
"The design under normal operating conditions must be sized, designed and
capable of providing at least 35 psi at all points in the distribution at flow rates of
at least 1.5 gpm per connection. (If a public water system's peak hour demand is
greater than 1.5 gpm per connection, then the system must be sized, designed
and capable of meeting the actual peak hour demand.)"
• 1.5 gpm 1 connection = As Determined in Section 11.1
• ONSWTP System Actual PHD = As Determined in Section 11.1
i) Based on the projection analysis described in Section 1.1 above, allocate
both demands to the model in two separate scenarios to satisfy 1 .
gpm /connection from TCEQ Rules and Regulations §290.45 (g)(5)(A)(i)
as well as ONSWTP system actual PHD to provide consistency in
comparing each modeled scenario.
ii) Perform the steady -state hydraulic simulation to confirm that under
normal operating conditions, at least 35 psi is maintained at all points in
the distribution system at the PHDs described above. All booster pump
stations will be in service. This simulation will be performed for the 2025
scenario for both demand_ scenarios (2 model runs)
iii) Provide justification for reasons the ONSWTP's actual Peak Hour
Demand should be used.
iv) Create a color coded exhibit identifying the pressure at every node in the
distribution system for this simulation.
11.3 2025 System Emergency Power Hydraulic Simulation at Average Daily
Demand (ADD)
This task addresses the following comment in the April 6, 2009 letter from TCEQ.
"Hydraulic simulation with emergency onsite generated power with automatic
switchover simulated. This should demonstrate that the system can provide 0.35
gpm per connection or average daily demand, whichever is greater and provide
0.35 gpm per connection to storage with operation of only facilities powered by
onsite emergency generators. The onsite emergency power facilities must power
sufficient production, pumping and treatment facilities to provide 0.35 gpm per
connection to storage." "in addition, the emergency hydraulic simulation should
include a surge analysis to determine the high and low transient pressures that
occur during an emergency pump shutdown."
• 0.35 gpm 1 connection = As Determined in Section 11.1
• 0.35 gpm 1 connection to storage = As Determined in Section 11.1 -
demand at storage facilities will be applied to the steady -state model
• ONSWTP System ADD = As Determined in Section 11.1
• No booster pump stations will be in service.
i) Perform the steady -state hydraulic simulation to confirm that under
emergency power conditions, at least 35 psi is maintained at all points in
the distribution system at the AAD determined for each scenario along
with providing an additional 0.35 gpm per connection to the System's
storage facilities. No booster pump stations will be in service. This
simulation will be performed for the year 2025 scenario
ii) Create a color coded exhibit identifying the pressure at every node in the
distribution system for this simulation.
AMEND. NO. 1
EXHIBIT "A"
Page 3 of 7
11.4 2025 System Power Loss at Peak Hour Demand (PHD)
This task addresses the following comment in the April 6, 2009 letter from TCEQ.
"A hydraulic analysis for each pressure plane must be conducted under peak
hour customer demands and include the recorded lag time between loss of
normal power and the commencement of emergency power. The analysis must
demonstrate that pressures in each pressure plane will not be less than 20 psi.
Please note whether the emergency power facilities have automatic switchover
controls or are manually started, and note the corresponding time for System
staff to power up the onsite emergency power equipment and bring necessary
equipment online after the loss of normal power."
• The existing onsite emergency power generators at ONSWTP have
automatic start -up controls and capabilities. The High Service pumps
must be manually re- started once the generators have ramped up to full
speed.
i} Coordinate with Water Department personnel to accurately determine the
maximum realistic duration (lag time) between a power outage and
placing the High Service pumps back in service. Obtain the Standard
Operating Procedure from Water Department Staff and implement the
current procedure into the controls within this scenario of the water model
and provide as an attachment to the report.
ii) Perform the necessary extended Period hydraulic simulation to show
that under a power loss condition, at least 20 psi is maintained at all
points in the existing distribution system at the PHD determined for each
scenario and for the duration required to place the necessary pumps back
in service. The pumps at O.N. Stevens WTP are assumed to be without
power until backup generators are put into place and pumps are
strategically turned back on. This simulation will be performed for the
year 2025 scenario
iii} Provide calculations and assumptions in by appendix within a report.
Create a color coded exhibit identifying the minimum pressure at every
node in the distribution system during the outage duration.
11.5 Surge Analysis (Existing and 2025 System)
This task addresses the following comment in the April 6, 2009 letter from TCEQ
"in addition, the emergency hydraulic simulation should include a surge analysis
to determine the high and low transient pressures that occur during an
emergency pump shutdown."
i) Transfer the existing water model into the recommended surge software
and verify that all controls and attributes have been accurately carried
over into the new software.
ii) Research and implement industry standard internal diameters and wall
thicknesses of each pipe in the model by pipe material and nominal
diameter.
iii} Surge analysis results will be based on industry standard pipe wall
thicknesses; however, it is suspected that slight inaccuracies in wall
thickness will have major impacts to the results. Provide a sensitivity
analysis of the pipe wall thicknesses and include caveat within the report
that the surge analysis results are only subject to the accuracy of the
estimated internal pipe diameters.
iv) Calculate the wave speed for each pipe using the wave speed calculator
in the surge analysis software.
AMEND. NO. 1
EXHIBIT "A"
Page 4 of 7
V) Provide a workshop with City to determine the surge analysis locations
and scenarios further described in Sections 11.5 (vi) and (vii). An
allowance of 15 scenarios will be provided.
vi) Perform surge analysis where transient events are usually most severe
(at pumps stations and control valves, in high elevated areas, at locations
of low static pressure, and in remote locations that are distanced from
elevated storage). Conduct Analysis and setup profiles to determine the
routes which will encompass the critical points in the distribution system.
This simulation will be performed for existing and year 2025 scenarios.
vii) Perform the analysis and review results for each profile of typical events
that require transient considerations:
(1) Pump startup and shutdown (i.e. power outage)
(2) Valve opening and closing at tanks and in large transmission
mains
(3) Rapid changes in demand conditions (i.e. hydrant flushing or LVU)
(4) Changes in transmission conditions (i.e. main break)
viii) Review previously prepared engineering report on system surge by
others.
ix) Provide calculations and assumptions by appendix within the report.
Create a color coded exhibit identifying the critical locations in the
distribution system.
11.6 2025 System Implementation Plan
i) Develop and select available alternatives for phasing the implementation
plan.
ii) Analyze modeling results to determine the hierarchy of alternatives
selected in Section 11.6 (i) based on hydraulically critical locations and
provide a maximum of 4 phases for implementation of the elevated
storage and associated boundary modifications.
iii) Coordinate with City Water and Engineering Departments to provide a
probable construction plan and schedule which includes milestone dates
of the City's plan for increased elevated storage capacity and pressures.
iv) Provide plan and schedule by appendix within the report.
11.7 Meetings
i) Prepare for and conduct five (5) project status meetings not to exceed
two (2) hours each with City Water and Engineering Staff approximately
every two weeks after specific project milestones. One of the five
meetings is to include a dry run meeting with City Engineering and Water
staff prior to meeting with TCEQ.
ii) Conduct two (2) meetings with TCEQ's oversight and development team
not to exceed eight (8) hours (including travel time) each to present model
results and submit final revision of the ACR.
11.8 Engineering Letter Report
i) Update the variance request letter report, as appropriate for submission
to the TCEQ concerning city -wide Alternative Capacity Requirements
(ACR) for the elevated storage tank volume component of the ONSWTP
system, in response and compliance with TCEQ letter dated April 6,
2010. The variance letter with supporting report will include, but not
necessarily be limited to, the following information and sections.
AMEND. NO. 1
EXHIBIT " A "
Pa e5of7
• Executive Summary
• Modeling methodology including pump controls, assumptions, etc.
• Demand discussion on customer types & demand factors
• Model Calibration data
• Modeling scenario descriptions
• Surge protection analysis
Modeling Results in exhibit and tabular summary format
• Implementation Plan
ASSUMPTIONS:
• As requested by TCEQ, Padre Island pressure zone will be removed from all modeling
scenarios.
• Holly Pump Station and associated separation valves will be removed from the distribution
system and all modeling scenarios.
Schedule:
• All work associated with the TCEQ variance request and implementation plan shall be
completed by the Engineer by December 12, 2011.
• All work associated with the Preliminary Design, Permitting, Environmental Issues, Site
Evaluations, and Water Age Evaluation for the Elevated Storage Tanks City -Wide Project
(8651) shall be completed by the Engineer 120 calendar days following TCEQ's approval
of the ACR Variance Request. ROW Acquisition Survey shall be concurrent with the
Modified Design Schedule.
Fees:
A. Fee for Additional Services Authorized. The City will pay the Engineer a lump sum fee
not to exceed $ 0.00 for provided services specified in this contract. The fee will be full
and total compensation for services and for all expenses incurred in performing these
services. Engineer will submit monthly statements for basic services rendered. Each
statement will be based on the project percent completion at the time of billing. City will
make prompt monthly payments in response to Engineer's monthly statements.
AMEND. NO. 1
EXHIBIT "A"
Pa e6of7
B_ Summary of fepG SPP hPlnw
02/10/09
M2009 -032 Admin Approval
Please feel free to contact me, should you have any questions.
Sincerely, LNV, INC.
TBPE Fi . F -366
Leyendecker, P.E., President
AMEND. NO. 9
EXHIBIT "A"
Page 7 of 7
ORIGINAL
CONTRACT
AMEND. NOA
TOTAL
BASIC SERVICES
1
Preliminary Phase
$55,000.00
$0.00
$55,000.00
2
Design Phase
160,000.00
0.00
160,000.00
3
Bid Phase
5,000.00
0.00
5,000.00
Construction Phase
4
an 1
39,000.00
0.00
39,000.00
Tank 2
39,000.00
0.00
39,000.00
Tank 3
39,000.00
0.00
39,000.00
Subtotal Basic Services
337,000.00
0.00
337,000.00
ADDITIONAL SERVICES
1
Permit Preparation
29,998.00
0.00
29,998.00
2
ROW Acquisition Survey
18,038.00
0.00
18,038.00
3
Topographic Survey
21,024.00
0.00
21,024.00
4
Environmental Issues
23,996.00
0.00
23,996.00
Construction Observation Services
5
Tank 1
47,000.00
0.00
47,000.00
Tank 2
47,000.00
43,740.00
3,260.00
Tank 3
47,000.00
47,000.00
0.00
Start-Up Services
6
Tank 1
5,978.00
0.00
5,978.00
Tank 2
5,806.00
0.00
5,806.00
Tank 3
5,806.00
0.00
5,806.00
Warranty Phase
7
Tank 1
3,147.00
0.00
3,147.00
Tank 2
2,972.00
0.00
2,972.00
Tank 3
2,904.00
0.00
2,904.00
Provide SCADA Documentation
8
Tank 1
2,521.00
0.00
2,521.00
Tank 2
2,521.00
0.00
2,521.00
Tank 3
2,521.00
0.00
2,521.00
9
Siting Evaluation and Recommendation
59,970.00
0.00
59,970.00
10
ure and Water Age Evaluation
40,040.00
0.00
40,040.00
11
t202EFScenarios and Surge Analysis - ACR
evated Stora e
0.00
90,740.00
90,740.00
Subtotal Additional Services
368,242.00
0.00
368,242.00
TOTAL FEE
$705,242.00
$0.00
$705,242.00
02/10/09
M2009 -032 Admin Approval
Please feel free to contact me, should you have any questions.
Sincerely, LNV, INC.
TBPE Fi . F -366
Leyendecker, P.E., President
AMEND. NO. 9
EXHIBIT "A"
Page 7 of 7