HomeMy WebLinkAbout2022-175WORK ORDER 9
Water Quality Study and Potable Water Treatment Facility Evaluation
This Work Order Number 9 is entered into as of this 20day of Sept , 2022, pursuant to that
certain Continuing Contract Agreement, dated April 17, 2018, renewed and amended as of May 18,
2021 (collectively referred to as the "Agreement"), by and between INDIAN RIVER COUNTY, a political
subdivision of the State of Florida ("COUNTY") and Tetra Tech, Inc. ("Consultant").
The COUNTY has selected the Consultant to perform the professional services set forth on
Exhibit A (Scope of Work), attached to this Work Order and made part hereof by this reference. The
professional services will be performed by the Consultant for the fee schedule set forth in Exhibit B
(Fee Schedule), attached to this Work Order and made a part hereof by this reference. The Consultant
will perform the professional services within the timeframe more particularly set forth in Exhibit C
(Time Schedule), attached to this Work Order and made a part hereof by this reference all in
accordance with the terms and provisions set forth in the Agreement. Pursuant to paragraph 1.4 of
the Agreement, nothing contained in any Work Order shall conflict with the terms of the Agreement
and the terms of the Agreement shall be deemed to be incorporated in each individual Work Order as
if fully set forth herein.
IN WITNESS WHEREOF, the parties hereto have executed this Work Order as of the date first
written above.
••'o�� n�iiss�'
CONSULTANT: BOARD OF COUNTY COMMISSIONERS.,"J�?�y' �✓F?s°;
OF INDIAN RIVER COUNTiY
B By:
By:
Peter D. O'Bryan, Chairma
Print Name: Brenda Keenan P.E. VER
Title: Sr. Proiect Manager BCC Approved Date: September 20, 2022
Attest: Jeffrey R. Smith, Clerk of Court and Comptroller
By: tkA Vl(ti-ff-y'
Deputy Clerk
Approved:
Jason E. Br wn, County Administrator
Approved as to form and legal sufficiency:
ylan T. Reingold, County Attorney
ATTACHMENT A
INDIAN RIVER COUNTY DEPARTMENT OF UTILITY SERVICE
WATER QUALITY STUDY AND POTABLE WATER TREATMENT FACILITY EVALUATION
SCOPE OF SERVICES
I. BACKGROUND
The County operates two water treatment facilities to provide potable water service to its customers. The
two plants have a combined capacity of 25.7 MGD and an average daily flow of approximately 12 MGD.
The plants obtain raw water from the upper Floridan aquifer and treat it with nanofiltration. Pretreatment
for the membranes includes addition of sulfuric acid and a scale inhibitor. The permeate is blended with
raw water and chlorine is added for disinfection, fluoride is added for fluoridation and lime, carbon dioxide
and sodium hydroxide are added for remineralization, pH and alkalinity control and calcium carbonate
stability.
The proposed study is intended to focus on finished water quality as it leaves the treatment facilities and
water quality within the distribution system and how it may affect the metallic components of the
customers plumbing systems. The study will also evaluate the operation of the existing treatment facilities
in terms of efficiency and operation in accordance with industry standards and applicable regulations.
Recommendations for modifications to the operations or water treatment processes to improve their
efficiency, finished water quality or reduce corrosivity will be included in the final report.
The professional services described herein will be performed in accordance with the Continuing Contract
Agreement for Engineering Services, dated April 17, 2018, Amendment 1 between Indian River County
and Tetra Tech, Inc.
II. SCOPE OF WORK
Task 1— Preliminary Work Tasks
1. Tetra Tech will arrange for and attend a project kickoff meeting to introduce team members,
establish lines of communication, discuss project objectives and expectations and review data
availability and collection. Tetra Tech will prepare and distribute minutes to all participants within
a week of the meeting.
2. Tetra Tech will develop an initial data request of documents and information required to perform
the study and evaluation. The data request will be prepared in preparation for the kickoff meeting
so that it can be reviewed at the meeting.
3. Tetra Tech will set up a time and date to tour each of the two treatment facilities to familiarize
themselves with the processes and operations of both facilities. It is anticipated that these tours
will take place after a substantial portion of the requested data has been received so that
questions about the data can be answered during the tour.
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4. Tetra Tech will receive, list, and organize all the data received from the County for use in the study
and evaluation.
Task 2 — Process and Finished Water Quality Evaluation
1. Using the water quality and operating data provided by the County, Tetra Tech will perform
membrane projection, chemical addition and blending calculations for the existing treatment
plants so that changes in operations can be simulated to determine the effect of operational
changes. The calculations will be used to understand how key water quality parameters are
changed in each step of the process and how changes to the existing operation will change the
finished water quality.
2. Values for various corrosion and stability indices will be calculated for the permeate, blended
water, finished water and a combination of varying percentages of finished water from each of
the two treatment facilities blended to simulate water quality in the distribution system. It is
anticipated that the following indices will be calculated:
• Langelier Index
• Calcium Carbonate Precipitation Potential
• Larson Index
• Chloride to Sulfate Mass Ratio
• Ryznarindex
The calculations will be performed using custom spreadsheet tools and the AWWA Tetra Tech
(RTW) Model for Water Process & Corrosion Chemistry, Version 2.0. The significance of each index
as it relates to corrosion of various metals will be discussed and ways to modify the finished water
quality to make it less corrosive will also be discussed.
The key water quality parameters and corrosion indices will be summarized in tabular form and
graphically as appropriate to compare water quality from the two treatment facilities and how it
might change as they are mixed in the distribution system.
3. The water quality will be compared to the recommendations in the USEPA "Optimal Corrosion
Control Treatment Evaluation Technical Recommendations for Primacy Agencies and Public
Water Systems", March 2016 to determine if the existing water quality is consistent with the
recommendations for optimum corrosion control for this system. If the recommendations are not
consistent with the current operations, changes to achieve optimum corrosion control will be
described. Overall recommendations for adjustments to the operation and finished water quality
based upon work performed under this task will be summarized.
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Task 3 — Distribution System Water Quality
1. Tetra Tech will obtain and compile water quality information from the distribution system
provided by the County. The distribution water quality will be compared to the finished water
quality from the two treatment facilities to see if it is consistent with the quality at the point of
entry or undergoes changes in the distribution system.
2. Customer comments received by the County and furnished to Tetra Tech will be separated by
type, e.g., brown water, chlorine taste, scaling, pinhole leaks, etc. The customer comments by
type will be graphed versus time to determine if there is any seasonal pattern or if an increase in
customer comments occurs at a particular point in time that can be correlated to a specific event
such as a main break or change in plant operation.
3. Customer comments, lead and copper sampling results and other distribution water quality
sampling results will be entered into GIS. Maps will be created from the information input to
identify areas with increase customer comments, higher lead or copper concentrations and/or
with varying water quality.
4. Tetra Tech will review recent published distribution water quality and corrosion control
information and studies for similar water quality and impact upon premise plumbing systems and
summarize the findings and recommendations of those studies as they relate to the County's
system.
5. Tetra Tech will summarize findings and conclusions based upon the review of the distribution
water quality evaluation conducted under this task. Recommendations will be provided for
modifications to the treatment process, finished water quality or operations, as appropriate, to
improve water quality within the distribution system and minimize the impact upon premise
plumbing systems
Task 4 — Proiect Updates
1. Tetra Tech will schedule and conduct a monthly meeting with the County staff to discuss issues
related to the study, make the County aware of any issues that require attention on an expedited
basis and discuss the progress of the work. Tetra Tech will prepare and provide to all participants
minutes of the meetings including any significant items discussed, decisions made, direction
given, items agreed upon and action items.
Task 5 — Summary Report
1. The work performed under the proceeding tasks will be summarized in a draft report and provided
to the County for review and comment. Tetra Tech will meet with the County to discuss the report
and receive any comments or questions about the analysis and recommendations. A final report
will be prepared and furnished to the County to respond to any comments or questions raised on
the draft report.
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III. PROVIDED BY COUNTY
Information including, but not limited to the following, to be provided by the County to facilitate
performing the scope of services:
• Monthly operating reports
• Finished water quality goals
• Chemical usage and dosages
• Historical raw, permeate, blended and finished water quality
• Membrane skid array, number of vessels, membranes per vessel, membrane manufacturer and
type, design flux, age, and first stage permeate backpressure or energy recovery device
information, if applicable
• Detailed process schematic for each of the water treatment plants
• Distribution water quality sampling data
• Lead and copper sampling data
• Historical customers comments received
IV. COMPENSATION SUMMARY
Attachment B presents a more detailed breakdown of the estimated compensation defined in the Scope
of Services. The total lump sum compensation for this proposal is $84,003. The County will be invoiced
monthly for charges incurred during the previous month and submit the invoice to the Water Wastewater
Operations Manager by the 15th of the following month.
Scope
Task 1— Preliminary Work Tasks
$8,561
Task 2 — Process and Finished Water Quality Evaluation
12,981
Task 3 — Distribution System Water Quality
32,056
Task 4—Project Updates
7,089
Task 5 — Summary Report
23,316
Total
$84,003
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V. SCHEDULE
Task
Task 1— Preliminary Work Tasks
Days
40
Task 2 — Process and Finished Water Quality Evaluation
30
Task 3 — Distribution System Water Quality
45
Task 4—Project Updates
Ongoing
Task 5— Summary Report
25
Total
140
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� Price Proposal
Labor Plan
7 Resource
ATTACHMENT B
Water Quality and Treatment Eva
Perform study and evaluation of water treatment facilities and potable water quality.
Submitted to: Indian Iverounty Dept. of Utility Sel
Contract Type: Lump Sum
Project Phases / Tasks
Rate--
Total
Labor Hrs
565
223.56
x
51
295.68
}
a v
55
152.88
N
o rS
146
112.5
_
287
126.93
-
C
N
4%d
38
82.5
o
A
C
E
d
44
115.38
C
-
r
i
24
Labor
83,255
Pricing by Resource
Task Pricing
Travel ODCs Totals
473 275 84,003
1. Preliminary Work Tasks
59
8
3
22
23
-
3
8,308
253
8,561
Attend Kickoff Mtg. and Prepare Minutes
18
5
2
5
5
1
2,971
2,971
Prepare Data Request
6
1
1
3
1
683
683
Tour Water Treatment Facilities
22
10
12
2,879
253
3,132
Collect and Organize Data
131
2
4
1 6
1
1,775
1
1,775
2. Process and Finished WQ Evaluation
95
3
8
20
S6
-
8
1211ti
12,981
Perform process calculations
57
1
4
12
40
7,629
7,629
Calculate corrosion indices
21
1
2
6
12
2,970
2,970
Compare WQ to Optimum Corrosion Cont
17
1
2
2
4
8
2,382
2,382
3. Distribution System Water Quality
218
12
24
s0
84
n
20
31,781
275 32,056
Compile and Compare WQ Data
33
1
2
6
20
4
4,312
4,312
Compile and Graph Customer Comments
32
3
3
6
16
4
4,457
4,457
Map Water Quality Information
44
3
3
6
4
28
6,331
6,331
Review Corrosion Control Literature
73
3
8
16
40
6
10,477
275 10,752
Summarize Findings and Conclusions
36
2
8
16
4
6
1
6,204
6,204
4. Project Updates
35
12
8
12
3
7,089
7,089
Arrange for and Attend Progress Mtgs.
27
10
8
8
1
5,865
5,865
Prepare Meeting Minutes
8
2
4
2
1,224
1,224
5. Summary Report
158
16
12
42
44
10
18
16
23,096
220
23,316
Prepare Draft Report
120
8
8
34
32
10
12
16
17,057
17,057
Attend Review Meeting
18
4
2
4
6
2
2,937
220
3,157
Prepare Final Report
20
4
2
4
6
4
3,102
1
3,102
Totalel
5651
51 1
55
146
207 1
38
441
24 1
83,255
473
275
Tetra Tech - Confidential and Proprietary Page 1 of 1 Printed 8/31/2022