Task Order No. 10460.e with Brown and Caldwell for WWTP Capacity AssessmentTASK ORDER NO. 10460.e
Under the
MASTER AGREEMENT FOR PROFESSIONAL SERVICES
BETWEEN
CITY OF MERIDIAN (CITY) AND BROWN AND CALDWELL (ENGINEER)
This Task Order is made this _ day of November, 2014 and entered into by and between the
City of Meridian, a municipal corporation organized under the laws of the State of Idaho, hereinafter
referred to as "City", and accepted by BROWN AND CALDWELL, hereinafter referred to as
"Engineer" pursuant to the mutual promises, covenant and conditions contained in the Master
Agreement (Category 2A) between the above mentioned parties dated October 1, 2014. The
Project Name for this Task Order 10460.e is as follows:
CITY OF MERIDIAN
WWTP CAPACITY ASSESSMENT
Project Understanding
This Scope of Work covers the Consultant and City of Meridian (City) activities that will occur during
the wastewater treatment plant (Plant) Capacity Analysis Project. The primary objective of this
investigation is to determine the maximum capacity of the treatment plant while satisfying permit
requirements, operational and maintenance requirements, and reserve capacity needs. Another
objective is to identify the capacity bottlenecks in the plant and prioritize improvements. These
improvements may include changes in operating characteristics, construction of new units, and/or
removal of bottlenecks. The project analysis and recommendations will be a collaborative effort
between the City operations and engineering staff with Brown and Caldwell (BC).
Project Objectives
The objectives of the Capacity Analysis Project include the following:
1. Establish the capacity of the plant operating as designed, with all units in service.
2. Establish the Idaho Department of Environmental Quality defined firm capacity with the largest
of each type of process unit out of service.
3. Determine reserve capacity to accommodate growth or industries.
4. Prioritize processes for optimization, upgrade, and the incremental capacity gains achieved with
each modification.
The project will include the following tasks:
• Task 10 — Project Management
Task 20 — Gather Plant Performance and Background Data
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• Task 30 — Solids Mass Balance Analysis
Task 40 — Establish Process Objectives
Task 50 — Plant Hydraulic Profile Analysis
• Task 60 — Primary Sedimentation Analysis
• Task 70 — Biological Process Evaluation
Task 80 — Secondary Clarifier Evaluation
• Task 90 — Solids System Evaluation
• Task 100 — Disinfection System Evaluation
• Task 110 — Systems Integration and Plant Capacity Report
Scope of Work
Task 10 — Project Management
Objective. To manage, administer, and provide ongoing coordination for utilization of resources for
the project. This task includes technical and financial management of the contract and liaison with
the City, operational staff, and project team.
Approach.
1. All communication from the Consultant regarding the project will include the City project
manager (PM) or designee. The City PM will be responsible for coordinating and providing all
review comments and the resolution of all issues to the Consultant in a timely manner (typically
fourteen (14) calendar days for design review); all other decisions will be provided to the
Consultant within seven (7) calendar days or less. Consultant PM will be responsible for drafting
meeting minutes.
2. Consultant will document any and all requested changes to the scope of work using a Project
Change Request form. The Consultant PM will collaborate with the City PM to develop an
approach for addressing the change(s). The City PM will review all changes for approval and
provide the Consultant with written approval prior to modifying the existing scope, schedule, and
budget and prior to proceeding with any new or unscoped work activities.
3. Attend up to five (5) coordination meetings with City staff.
4. Prepare a Field Work Safety Plan to guide field activities during the investigation.
City Responsibilities. Provide the following:
1. Identification of a PM with final authority for City decisions.
2. Timely review of products and decisions on issues critical to scheduled progress.
3. Identification and involvement of appropriate City staff.
4. Coordinate collection of comments and resolution of any conflicting comments from all City
reviewers prior to returning to the Consultant.
Work Products. Deliverables for the tasks listed above include the following items:
1. Monthly progress reports and invoices
2. Field Work Safety Plan
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Task 20 — Gather Plant Performance and Update Background Data
Objective. Collect plant performance data, service area planned flows and loadings, operating data
and plant configuration information to identify additional data needs and conduct plant capacity
analysis. Organize the data to facilitate systems analyses.
Approach.
1. BC will gather the following data from the City:
— Historical operating data for the past three (3) years, including daily monitoring reports and
any additional available data. (This has been obtained and needs to be updated based on
daily records.)
— The most recent set of facility flow and loading projections, including specific industry
contributions.
— Plant design data, including drawings, equipment submittal documents, product data, and
relevant reports; plans, and studies. (This has been obtained.)
2. Prepare a sampling plan for sampling performance of the primary sludge fermenter and for spot
sampling of the influent and effluent to confirm that the previous wastewater characterization
(completed in 2011) is still relevant. If confirmatory sampling shows differences in current plant
influent from previous plant influent, prepare a sampling plan for a 14 -day wastewater
characterization to be conducted at the Plant. The purpose of the wastewater characterization is
to understand the Plant's unique influent composition and to assess performance of various unit
processes within the Plant. Ultimately, the wastewater characterization data will be used to
calibrate the biological process models in Task 70.
3. Hold a workshop to discuss the sampling and to distribute responsibilities between BC, the City,
and contract laboratories.
4. Coordinate the conduct of the sampling, providing direction to City staff regarding sampling
times and locations.
City Responsibilities.
1. Provide daily historical operating data for the past three (3) years.
2. Provide the most recent set of facility flow and loading projections.
3. Provide access to Plant design data, including drawings, equipment submittal documents,
product data, and relevant plans and studies, upon request. (Much of this has been done.)
4. Review and comment on the wastewater characterization sampling plan.
5. Participate in the wastewater characterization workshop.
6. Collect samples, as required.
7. Send samples to contract laboratories for analysis, as required.
8. Conduct laboratory analyses, as required.
Assumptions.
1. Plant historical data, flow and loading projections, and design data will be transmitted in
electronic format when possible.
2. The City will either conduct laboratory analyses in house or will contract directly with a send -out
laboratory to conduct analyses. Shipping and analytical costs are not included in this scope of
work.
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3. City staff will conduct sampling and preserve, store, organize, and assemble samples for
shipping and/or analyses.
Work Products.
1. Wastewater sampling plan
Task 30 — Solids Mass Balance Analysis
Objective. Understanding how solids are inventoried, accumulated, and consumed in the liquid and
solids stream processes is important in understanding the capacity of the whole plant. The mass
balance also helps to identify, assess, and correct uncertainties or inconsistencies in the Plant data
record.
Approach.
1. Construct solids mass balance based upon historical data and data obtained during the
wastewater characterization in Task 20.
2. Assess mass balance closure across various Plant unit processes in order to determine data
gaps, irregularities, or inconsistencies in the data record.
3. Investigate mass balance irregularities and suggest follow up sampling and/or equipment
assessment, as needed.
4. Use calibrated mass balance to project system loadings for use in the following tasks.
City Responsibilities.
1. Support the mass balance analysis through phone and/or email conversations, limited
supplemental sampling, and providing equipment data, as needed.
Task 40 — Establish Process Objectives
Objective. Collaboratively develop process objectives and evaluation criteria for conducting the
capacity analyses.
Approach.
1. One (1) workshop will be held with City staff to identify process criteria, including the following:
— Planning period and assessment timeframes
— Effluent performance target (single target will be established for analysis for each season)
— Seasonal differences in Plant operation or effluent performance targets (up to two seasons)
— Number of units in service/out of service to meet specific demands
— Additional operational considerations or scenarios of interest, including the following:
• Capacity for nitrification
• Capacity for nitrogen removal
• Capacity for phosphorus removal
City Responsibilities.
1. Attend and participate in workshop
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Task 50 — Plant Hydraulic Profile Analysis
Objective. Estimate the plant hydraulic profile and energy grade -line for liquid stream using the
PROFILE program calibrated to field conditions. Identify system bottlenecks through computer
simulations and field observations.
Approach.
1. Conduct field reconnaissance and review Plant data.
2. Construct a hydraulic model of liquid stream unit processes.
3. Calibrate the hydraulic model to field conditions.
4. Observe field conditions during high flow event in 2015.
5. Identify hydraulic bottlenecks.
6. Summarize findings and prepare recommendations.
City Responsibilities.
1. Provide operating schemes for each unit process including operating levels and typical recycle
rates.
2. Conduct water surface elevation measurements as needed.
Task 60 — Primary Sedimentation Evaluation
Objective. Evaluate the performance of the primary sedimentation system to remove BOD and
TSS and estimate the effect on downstream processes.
Approach. Using the results of the previous tasks, conduct statistical evaluations of past plant data
and wastewater characterization data to develop a spreadsheet model of unit process performance.
This model will be used to project loadings to the secondary process.
1. Statistically correlate historical TSS and BOD removals with hydraulic and mass loading
2. Develop primary sedimentation performance model to project loadings to secondary process
Task 70 — Biological Process Evaluation
Objective. The primary focus of this task is to identify the maximum biological treatment capacity,
with respect to current permit requirements, and criteria established in Task 40.
Approach. This task will involve using an existing calibrated model for the Plant to project Plant
performance across a range of flow and loading scenarios. The investigation will determine the
capacity of the biological process.
1. Use existing calibrated BioWin activated sludge process model, updated if necessary using
data collected in Task 20. Wherever possible, we will collect data that will be compatible with
calibrating the SUMO simulator.
2. Use the calibrated models to simulate performance across a range of flows and loads, for up to
a maximum of four (4) different operating conditions. The conditions will be decided upon in
Task 40 and may include the following variables:
— Seasonal condition: summer, winter
— Effluent target condition: existing permit, future permit, ammonia removal, phosphorus
removal
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— Units in service: primary clarifiers, aeration basins, secondary clarifiers, fermenter
3. The models will be used to project a suite of Plant parameters, including effluent characteristics,
effluent loadings, secondary clarifier loadings, WAS flow and loadings, and RAS flows.
Task 80 — Secondary Clarifier Evaluation
Objective. Estimate the capacity of the secondary clarification system through historical data
analysis and calibration of a state point analysis (SPA) model.
Approach. The Plant's historical data will be used to calibrate a state point analysis model. The
SPA model is a graphical approach to determining secondary clarifier capacity. The model depends
upon flow, mixed liquor settleability (characterized via the sludge volume index [SVI]), clarifier
surface area, and RAS flow rate. The model does not account for unique clarifier geometry
including center wells, launders, depth, or energy dissipating inlet structures.
1. Determine the design mixed liquor settleability condition through an analysis of historical
settleability (SVI) data.
2. Develop a correlation between the SPA model and historical clarifier operating conditions.
Generic correlations determined at other Plants and published in the scientific literature may be
used if the historical data does not include episodes of failure or near -failure conditions to
calibrate against.
3. Use the calibrated SPA model, in concert with the biological model outputs from Task 60, to
project the capacity of the secondary clarifiers.
Assumptions.
1. No sampling or on-site testing will be conducted as part of this task.
2. SPA model calibration will be based on a combination of historical data analysis and
correlations published in the scientific literature.
Task 90 — Solids System Evaluation
Objective. Determine the capacity of the solids handling treatment processes, including DAFT, two-
stage fermentation, digestion, and dewatering.
Approach. Solids system capacity will be evaluated through analysis of Plant historical data and
manufacturer's rated capacities of unit processes.
I. Evaluate historical performance of the solids system unit processes through analysis of
historical data, including solids loading rates, hydraulic loading rates, polymer use, capture
rates, volatile solids destruction (for the digester) and cake thickness.
2. Evaluate the capacity of the centrifuge using manufacturer rated capacity.
Assumptions.
1. No sampling or on-site testing will be conducted as part of this task
Task 100 — Disinfection and Tertiary Filtration System Evaluation
Objective. To assess the performance and identify capacity limitations within the tertiary filters and
disinfection system.
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Approach.
1. Review plant performance data for the existing tertiary filters and disinfection system.
2. Review vendor specifications for tertiary filters and specific disinfection process equipment.
Task 110 — Systems Integration and Plant Capacity Report
Objective. Combine the information from all above tasks to form an integrated assessment of the
plant capacity and bottlenecks. Develop a prioritized list of improvements to maximize existing plant
capacity.
Approach.
1. Conduct sensitivity analyses comparing component performance. Analyze and compare plant
performance against equipment/design data.
2. Prepare a prioritized list of bottlenecks and develop composite rating diagrams establishing the
plant capacity. This scope of work does not include developing cost estimates for the identified
improvements.
3. Provide the City with recommendations for expanding Plant capacity and optimizing Plant
performance.
4. Prepare draft Plant Capacity Report.
5. Review results and the draft report with City staff at a workshop.
6. Amend report based on City comments and prepare a final Plant Capacity Report.
City Responsibilities.
1. Review and comment on the draft Plant Capacity Report.
2. Attend a workshop to discuss the draft Plant Capacity Report.
Work Products.
1. Five copies of the draft Plant Capacity Report.
2. Five copies of the final Plant Capacity Report.
REIMBURSABLE EXPENSES
The estimated travel expenses are based on the following:
Task 40 Travel
— Airfare: two people @ $400 per round trip ticket
— Meals and incidentals: two people at per diem rate for two days ($46/day, $34.50/day on
travel days)
— Lodging: two people for one night at per diem rate ($83/night)
— Rental Car + gas = $80/day
Task 110 Travel
— Airfare: two people @ $400 per round trip ticket
— Meals and incidentals: two people at per diem rate for two days ($46/day, $34.50/day on
travel days)
— Lodging: two people for one night at per diem rate ($83/night)
— Rental Car + gas = $80/day
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TIME OF COMPLETION and COMPENSATION SCHEDULE
The following schedule is based on a Notice to Proceed (NTP) from the City by November 2014
and resulting in Final Report being completed by April 2015. A NTP issued on a different date will
change the schedule accordingly.
Due Date
20 ;'
Gather Plant Performance and Background Data
Aril 2015
$6,570 (labor)
36 -
Solids Mass Balance Analysis
Aril 2015
$2,320 (labor)
4Q
Establish Process Objectives
April 2015
$3,800 (labor)
$1,184 (expenses)
50 ''
Plant Hydraulic Profile Analysis
Aril 2015
$10,200 labor
60
Primary Sedimentation Analysis
Aril 2015
$1,920 (labor)
Biological Process Evaluation
Aril 2015
$11,560 (labor)
80
Secondary Clarifier Evaluation
Aril 2015
$2,320labor
Solids System Evaluation
Aril 2015
$2,320(labor)
Disinfection Svstem Evaluation
April 2015
$1.960 (labor)
Systems Integration and Plant Capacity Report
April 2015 $21,300 (labor)
$1,184 (exoem
The Not -To -Exceed amount to complete all services listed above for this Task Order No. 10460.e is
seventy two thousand one hundred eighty three dollars ($72,183.00). No compensation will be paid
over the Not -to -Exceed amount without prior written approval by the City in the form of a Change
Order. The hourly rates for services and direct expenses shall be billed per the approved Rate
Schedule and Master Agreement (by this reference made a part hereof) and will be the basis for
any additions and/or deletions in services rendered. Travel and meals are excluded from this Task
Order unless explicitly listed in the Scope of Services AND Payment Schedule.
End of Text. Signatures to follow on next page.
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Signature Page
Task Order 16460.e WWTP Capacity Assessment
Brown and Caldwell
CITY OF MERIDIAN
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e, MMY RD,MAYOR
Dated: //-a?5- N
BROWNe CALDWELL
Dated: 11 :' 1 (+—
Approved by Council: A6 p 25 f,Zq
JAYCEE V HOLMAN, CITY CLE K, SE&L
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Purchasing Approval Del
BY: BY:
KEIT ATTS, Purchasing Manager WA
City Project Manager
Clint Dolsbv
Task Order 10460,e WWTP Capacity Assessment
Brown and Caldwell
STEWART, Engineering Manager
Dated: / 1
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