HomeMy WebLinkAboutC2019-049 - 2/27/2019 - NA TASK ORDER NO. 36
This Task Order pertains to a Master Services Agreement for Professional Services by and between City of Corpus
Christi, Texas (City) and LNV, Inc. (Consultant) dated August 16, 2016 (Agreement). Consultant shall perform
services on the project described below as provided in this Task Order and in the Agreement. This Task Order
shall not be binding until it has been properly signed by both parties. Upon execution, this Task Order shall
supplement the Agreement as it pertains to the project described below.
PROJECT NAME/NUMBER: Water and Wastewater Treatment On-Call Support, E16264
1. PROJECT DESCRIPTION—This project provides the Utility Department with on-call services to assist with
any technical, operational, maintenance, diagnostic and design concerns for the City's O.N.Stevens Water
Treatment Plant and six wastewater treatment plants.
2. SCOPE OF SERVICES—ONSWTP Alternate Coagulant Pilot Testing and Full-Scale Demonstration, more
fully described in Exhibit A.
3. COMPENSATION —The total amount not to exceed for Task Order No. 36 only is $87,044.00.
This Task Order is approved, and Consultant may proceed. All other terms and conditions of the Agreement
remain in full force and effect.
CITY OF CO-d' C LNV, INC.'' _,
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/ r Date
J- H. Edmonds, P.E. Date Dan S. Leyendecke , P.E. a
Director of Engineering Services President
801 Navigation, Suite 300
Corpus Christi, TX 78408
(361) 883-1984 Office
loganb@Invinc.com
Fund Name Accounting Unit Account No. Activity No. Amount
Water Operating Fund 4010-31010-062 530000 E16264-01-4010-EXP $87,044.00
C2019-049
2/27/1q
LNV Inc. Task Order No. 36
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SCANNED
City Project No. E16264
Professional Services Contract
City of Corpus Christi
Water/Wastewater Treatment On-Call Support
Task Authorization No. 36 — ONSWTP Alternate Coagulant
Pilot Testing and Full-Scale Demonstration
February 8, 2019
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EXHIBIT A
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SCOPE OF WORK
Project No. E16264
Water and Wastewater Treatment On-Call Support
Task Authorization No.36—ONSWTP Alternate Coagulant Pilot Testing and Full-Scale
Demonstration
BACKGROUND
The O.N. Stevens Water Treatment Plant(ONSWTP)has a rated capacity of 161.5 MGD and provides
treated drinking water to the City of Corpus Christi(City)and its regional wholesale customers.The plant
consists of conventional water treatment methods including coagulation, flocculation, sedimentation,
filtration, and disinfection. A number of capital improvements are scheduled for the plant in 2019 and
2020 including upgrades to the front-end hydraulics and chemical feed systems as well as switching from
chlorine gas to on-site generation of low strength sodium hypochlorite. Considering the potential impacts
these projects could have on coagulation and on caustic usage,City staff wanted to consider and evaluate
other alternative coagulants.
The current coagulant being used at ONSWTP is aluminum sulfate (alum), which is typically dosed at
90-150 mg/L. In recent years, reductions in alkalinity from wet weather events, scaling in water pipes,
high solids production, increased total organic carbon(TOC) levels, and anticipation of the conversion
to onsite hypochlorite generation(OSG)have led to the need for the evaluation of an alternate coagulant.
In 2018, under Task Authorization 23, LNV/Hazen performed a series of bench-scale coagulant studies
to investigate the feasibility of switching to an alternative coagulant. The alternative coagulants evaluated
include polyaluminum chlorides (PAC1) and aluminum chlorohydrates (ACH). The results of the jar
testing with PAC1 and ACH products showed a number of benefits when compared with alum:
• Less alkalinity consumption
• Higher coagulation pH
• Reduced caustic use for pH adjustment
• Similar,and in some cases better,TOC removal and turbidity reduction
• Potential reduction in chemically produced solids
The overall goal of the bench scale alternatives testing was to provide the necessary data for a proof of
concept under current and future plant operating conditions.The data collected during bench-scale testing
was provided to the Texas Commission on Environmental Quality(TCEQ) along with a letter notifying
them of upcoming full-scale demonstration.
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EXHIBIT A
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PURPOSE
In order to receive TCEQ approval for permanent implementation of an alternative coagulant, the next
step in the approval process is to conduct the full-scale testing to demonstrate the alternative coagulants
can meet Stage 1 Disinfectants/Disinfection Byproduct Rule for total organic carbon(TOC)removal by
enhanced coagulation.
This task authorization will involve executing these next steps including;
1. Assist the City with planning, implementing and executing a full-scale coagulant
demonstration and reporting the results to TCEQ
2. While planning for the full-scale demonstration,assist the City in developing,implementing
and executing a pilot test plan utilizing the Intuitech pilot system at the ONSWTP
3. Assist the City with additional testing needed to compare and confirm solids production with
alum and PACl/ACH
The final deliverable of this work will be a technical memorandum sent to TCEQ summarizing the results
of the demonstration and requesting approval for a permanent switch to PACT/ACH.
NOTE: It should be noted that the level of effort involved in the pilot testing and full-scale
demonstration is difficult to define at this stage due to several unknown factors. The testing of
additional coagulants, potential permanent improvements required for full-scale set up, vendor
product delivery and equipment installation schedule and other factors can impact the level of effort
and schedule presented in this task authorization.
SCOPE OF WORK
The following section provides the scope of work for the pilot testing and full-scale demonstration
proposed to select the best suited alternate coagulant for the ONSWTP.The various steps involved in the
testing and demonstration are laid out and steps proposed to be completed by the City are highlighted in
yellow for reference.The City can choose to change the division of responsibilities between the Engineer
and City staff as required.
ADDITIONAL SERVICES:
Task 0009—General Engineering
The Engineer will perform the following work:
1. Full-Scale Coagulant Demonstration
As a part of this task, full-scale demonstration will be performed for two(2) products for a duration
of five weeks each.The following effort is proposed for this task:
a. Workshop-Lead and coordinate a full-scale testing workshop to ensure Consultant
and City Staff understand timelines, objectives, and constraints for the full-scale
testing.
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EXHIBIT A
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b. Full-Scale Demonstration Plan-Develop a written full-scale demonstration plan
to outline the objectives, methodologies, layout for chemical feed storage and
equipment, injection points, number of trials, number of trains, containment
requirements,timelines,data collection and reporting requirements.Design and/or
coordinate the sizing and installation of temporary chemical feed equipment.
c. Vendor Coord& Coagulant Selection—Assist in selecting which vendors and
products to be included in the full-scale testing using 2018 jar test results.Provide
appropriate vendor coordination as necessary to select appropriate chemical, to
order chemical and appropriate chemical feed equipment, coordinate delivery and
to ensure appropriate volume of chemical is onsite and available for full-scale
testing.
d. Full-Scale Set-up -Visit ONSWTP and determine the most appropriate location
for chemical storage and equipment layout for both Plants 1 and 2.Coordinate with
vendor and plant staff for execution of written full-scale testing agreements and for
equipment installation. Assist in full-scale set-up and prepare the facility for
coagulant testing. For budgeting purposes,onsite set-up assistance is estimated at
120 hours for start-up.
e. Full-Scale Demonstration — Execute demonstration plan based on available
timeline. Operate facilities with each coagulant being tested for the duration of five
weeks each. The City shall visit the facility daily to ensure proper operation, to
perform field testing, collect samples and deliver samples to laboratory. Review
laboratory testing results. With product water being conveyed into the distribution
system, it is believed that the City will take on the responsibility of this task with
assistance from the Consultant as described in Item"f`below.
f. Oversight&Troubleshooting-During operation,train staff,check operability and
assist in troubleshooting as necessary. Monitor data and system performance on a
weekly basis and make any necessary recommendations on process changes or
chemical adjustments. For budgeting purposes,onsite troubleshooting is estimated
at 40 hours per month following start-up.
g. Data Monitoring - Monitor water quality for changes in corrosion indices and
impacts to the distribution system. Water quality data to be collected includes
turbidity,TOC,pH,alkalinity,UV254,chloride,and sulfate. It is believed that the
City will collect these samples and provide this data to the Consultant on a weekly
basis.
h. Draft TCEQ Report—Prepare and submit a technical memorandum to the City,
signed and sealed by a Registered PE in the State of Texas,summarizing the results
of the full-scale demonstration.
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EXHIBIT A
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i. Final TCEQ Report—Following City approval, the memo will be submitted to
TCEQ for their review with the goal of receiving approval for a permanent switch
to PACl/ACH.If needed,prepare written responses to TCEQ comments and attend
meeting with TCEQ.
2. Pilot Scale Coasulant Evaluation
While planning for the full-scale demonstration, the Consultant will assist the City in developing,
implementing and executing a pilot test plan utilizing the Intuitech pilot system at the ONSWTP. The
following efforts are proposed for this task:
a. Workshop-Lead and coordinate a pilot testing workshop to ensure Consultant and
City Staff understand timelines,objectives,and constraints for the pilot testing.
b. Pilot Plan - Develop a written pilot testing plan to outline the objectives,
methodologies, number of trials, timelines, data collection and reporting
requirements.
c. Vendor Coord & Coagulant Selection—Assist in selecting which vendors and
products will be included in the pilot testing from 2018 jar tests results. Provide
appropriate vendor coordination as necessary to select appropriate chemical, to
order chemical,coordinate delivery and to ensure appropriate volume of chemical
is onsite and available for the pilot. The number of products tested may be limited
by the available time prior to full-scale demonstration.
d. Initial Dosage - Provide recommendation on dose of coagulant and polymer(if
necessary)to be used at pilot scale. To ensure dose is based on similar water quality,
this recommendation will be developed from bench-scale testing immediately prior
to beginning the pilot. Bench-scale testing will be completed in the lab at the
ONSWTP using City equipment.
e. Pilot Set-up-Visit pilot facility and determine if/how it needs to be reconfigured
for the coagulant testing. Assist in pilot set-up and prepare the facility for coagulant
testing. This includes removing and disposing of the GAC media,flushing system,
reconfiguring piping and/or instruments if necessary, labeling sample points, etc.
For budgeting purposes,onsite assistance is estimated at two full days for start-up.
f. Pilot Operation&Testing—Operate pilot facility with each coagulant being tested
for the duration necessary. Execute pilot testing plan based on available timeline.
It is understood that the City will take the lead in operating the pilot facility and will
visit it daily to ensure proper operation and will perform the daily O&M necessary
to maintain pilot operation. City will also perform field testing,collect samples and
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EXHIBIT A
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SCHEDULE
The Engineer's services shall be performed in a timely manner consistent with sound professional
practices.The Engineer will complete work according to the schedule provided in Attachment A.
The time limits set forth in the schedule shall include allowances for reasonable and expected review time
by the City and approval by authorities having jurisdiction over this project and shall not be allowed as
cause for delay or adjustments to the schedule. Delays caused by review times by the City exceeding
those anticipated by the Engineer's schedule are cause for adjustments in the schedule. Any adjustments
made to the agreed upon schedule shall be made in writing and accepted by both parties.
The Engineer shall begin work immediately upon receipt of the executed Task Authorization and/or
Notice to Proceed(written or emailed).
FEE
The services will be provided on a Time and Materials (T&M) basis as the project is moved towards
completion.The anticipated amount for this task authorization is$87,044.00 as shown in Attachment B.
If the level of effort exceeds this estimate,a separate task authorization will be requested.
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deliver samples to laboratory. Engineer will assist the City as necessary and will
review laboratory testing results.
g. Oversight&Troubleshooting-During operation,train staff,check operability and
assist in troubleshooting as necessary. Review pilot performance and make
recommendations for any necessary process or chemical adjustments. For
budgeting purposes, onsite assistance is estimated at 48 hours for two months
following start-up.
h. Pilot Results—If desired by the City,it may be beneficial to summarize all findings
and results. To minimize efforts, this could be done with a simple power point
presentation and workshop.
3. Solids Production Evaluation
a. Another key item is to assist the City with accurately determining the annual solids
production for the ONSWTP. This will involve additional sampling and testing
being performed during both the pilot and full-scale demonstration. The data
collected will be used to compare and confirm solids production with alum and
PACL/ACH.
DELIVERABLES
• Full-scale Demonstration Plan
• Pilot Testing Plan
• Pilot Testing Results in PowerPoint
• Draft and Final TCEQ Report which will contain a summary of findings of the full-scale
demonstration testing and performance results. After receiving comments from the City, the
FINAL TCEQ report will be prepared and provided to the City staff.
MEETINGS
• One(1)Pilot Testing and Full-Scale Demonstration Workshop
• One(1)Pilot Results Workshop
• One(1)Full Scale Demonstration Results Workshop
• One(1)Conference Call with TCEQ
ASSUMPTIONS
• The pilot system will be operated in parallel with the full-scale demonstration planning and
while full-scale equipment is being delivered to the site
• Pilot testing data will not be included in the TCEQ letter and will only be used for
optimizing coagulant dose if needed for the full-scale testing
• Laboratory analyses to be performed by City Laboratory
• Scope assumes up to one resubmittal of the TCEQ design report
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EXHIBIT A
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TASK AUTHORIZATION MANAGER
The Task Authorization Manager will be the primary contact person during the performance of this work.
All correspondence or inquiries should be addressed to the Task Authorization Manager. This work task
will be coordinated by:
Dan Grimsbo, P.E. A.I.C.P.
Executive Director of Utilities Department
City of Corpus Christi
Office: 361-826-1874
Fax: 361-826-1889
Email: DanGacctexas.com
APPROVAL
The undersigned has reviewed and approved this Task Authorization and recommends LNV, Inc. to
perform the work as presented:
Recommended by:
.
(y�r✓ l ,V)5 6 0 (Printed Name)
O j13,3 /7 (Date)
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EXHIBIT A
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