CMSD Phase 2 Pump Station Short Circuit Coordination Study and Arc-Flash Analysis Addendum No. 1

REQUEST FOR PROPOSALS
By
Costa Mesa Sanitary District
For
Phase 2 Pump Station Short Circuit Coordination Study and Arc-Flash
Analysis
21st Street PS
23rd Street PS
Adams PS
Canyon PS
Mendoza PS
Sea Bluff PS
Victoria PS
Release Date: May 6, 2026
Proposals Due: 10:30AM, July 2, 2026
Submittal Location:
Costa Mesa Sanitary District (Headquarters)
290 Paularino Avenue
Costa Mesa, CA 92626
(949) 645-8400

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INTRODUCTION
The Costa Mesa Sanitary District (hereinafter referred to as "District") is soliciting proposals
from qualified Proposers consisting of consulting firms, contractors, and/or teams to prepare
a short-circuit breaker coordination study and arc-flash analysis (Study Report) for seven (7)
District pump stations.
BACKGROUND
The Costa Mesa Sanitary District (CMSD) is an independent special district that was formed
in 1944 under the Sanitary District Act of 1923. It is governed by an elected five-member
Board of Directors that appoints a general manager to supervise the day-to-day operations of
the organization. The District boundaries encompass all of the City of Costa Mesa, a portion
of Newport Beach, and some unincorporated Orange County territory; serving a population
of approximately 116,700 and serving close to 4,000 businesses.
Wastewater is conveyed via 224 miles of collection system and 20 lift stations to OC
Sanitation, the regional wastewater treatment provider. CMSD total daily dry weather flow is
approximately 10 million gallons per day.
The District has determined that a Study Analysis must be conducted for the seven (7)
pump stations: 21st Street PS, 23rd Street PS, Adams PS, Canyon PS, Mendoza PS, Sea
Bluff PS, and Victoria PS. The Study Report is being conducted to determine the arc-flash
and short-circuit potential so that OSHA and Fire Code required warning information labels,
including personal protection equipment requirements, must be placed on the field switch
gear/electrical boxes.
Station Overview & Location(s)
1) The 21st Street pump station comprises two 10hp submersible pumps. The utility provides
240v power to the station. This station is located at 114 East 21st Street, Costa Mesa, CA
2) The 23rd Street pump station comprises two 20hp submersible pumps. The utility
provides 240v power to the station. This station is located at 2401 East 23rd Street,
Costa Mesa, CA
3) The Adams pump station comprises two 20hp submersible pumps. The utility provides
240v power to the station. This station is located at 2054 Adams Ave, Costa Mesa, CA
4) The Canyon pump station comprises two 20hp submersible pumps. The utility provides
480v, 3-phase power to the station. This station is located at 999 Canyon Ave, Costa
Mesa, CA
5) The Mendoza pump station comprises two 10hp submersible pumps. The utility provides
240v power to the station. This station is located at 2899 Mendoza Drive, Costa Mesa,
CA.
6) The Sea Bluff pump station comprises two 15hp submersible pumps. The utility provides
240V power to the station. The station is located at 1099 Sea Bluff Drive, Costa Mesa,
CA.
7) The Victoria pump station comprises two 20hp submersible pumps. The utility provides
240v power to the station. This station is located at 550 Victoria Street, Costa Mesa, CA.
The Station is only accessible via Miner Street and is adjacent to 2157 Miner Street,
Costa Mesa, CA.

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STUDY ANALYSIS GOAL
Conduct analysis, monitoring, review of the existing facilities, among other activities so that
a Study Report documenting the Breaker Coordination and/or Arc-Flash Analysis work
results. The goal is also for identifying and installing labeling to meet the various safety
regulations and requirements. The Study Report outcome will be used for the purpose of
installing electrical labeling per CalOSHA/OSHA, NFPA, and NEC requirements. The final
outcome will be for the District to obtain one (1) Study Report and have arc-flash warning
information installed at each station.
SCOPE OF WORK (SOW)
1. SCOPE
The Proposer shall, as appropriate:
A. Conduct, gather, and/or confirm background, technical information, and record
drawings. Note: Gathered information must be turned over to the District with
submission of the final report.
B. Conduct a site visit to each of the seven (7) pump stations. Take photos and
document the work location and condition of the equipment.
C. Confirm the accuracy of the station single-line diagram, note required corrections,
and submit a new and updated single-line diagram. Prepare the Single-line
diagrams on the District standard border drawing. Files will be provided in
AutoCAD and PDF.
D. Furnish/conduct an Arc Flash Hazard Analysis Study per NFPA 70E - Standard
for Electrical Safety in the Workplace, reference Article 130.5 and Informative
Annex D. Computer modeling, engineering calculations, and analysis shall be
provided and conducted by the contractor.
E. Conduct Breaker Coordination and/or Arc-Flash Analysis, among other activities
required to determine arc-flash level.
F. Furnish short-circuit and protective device coordination study(ies) for each of the
pump station(s). One (1) technical memorandum shall be provided for each pump
station. All materials, equipment, labor, and resources must be provided to
conduct work, studies, and analysis for preparing the written technical
memorandum(s).
G. Prepare and submit draft and final Study Report to the District. The Study Report
shall consist of the following minimum:
I. Executive Summary and Overview of Study Results
II. Introduction of Study and Work

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III. Discussion and Detailed Findings
IV. Conclusions and Recommendations
V. Attachment(s)
A. Tech Memos
B. Single Line Diagrams
C. Photos
D. Safety Requirements
E. Breaker Coordination/Arch-Flash Model or Study Results
H. Meetings:
a. One (1) kick-off meeting (use 1-hour)
b. One (1) 90-minute technical/project meeting. Schedule Meeting about a
week or 10 calendar days after the draft report(s) has/have been submitted
to the District. The meeting's purpose is to provide an overview of the
results, findings, and any recommendations. In addition, the District will ask
questions and provide comments for the contractor to address prior to
finalizing and publishing the report. The presentation and report(s) must
be organized by station.
c. One (1) 60-minute Meeting (use and/or content TBD)
I. Staff Arc-Flash and Arc-Flash Related Safety and Documentation Training (On-
Site at District HQ). Cover the following topics:
a. Overview of Safety, Fire, and Electrical Code Requirement
b. Arc-Flash training and Field Instruction for District Wastewater Staff.
i. Safety Requirements, PPE, and Equipment Needs by station.
ii. Review of District Procedures and Consultant Recommended
Procedures for each station.
iii. Logs, Record Keeping, Information and data needs, Inspection and
Maintenance Requirements to comply with NFPS, NEC, and
CalOSHA/OSHA requirements.
iv. Demonstration on how to safely open panels, access equipment for
maintenance and troubleshooting purposes. Demonstration of specific
electrical safe.
v. How to properly open and close breakers.
c. Review Outcomes and Technical Requirements for each Station.
2. REFERENCES
A. Institute of Electrical and Electronics Engineers, Inc. (IEEE):
1. IEEE 141 - Recommended Practice for Electric Power Distribution and
Coordination of Industrial and Commercial Power Systems

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2. IEEE 242 - Recommended Practice for Protection and Coordination of
Industrial and Commercial Power Systems
3. IEEE 399 - Recommended Practice for Industrial and Commercial Power
System Analysis
4. IEEE 241 - Recommended Practice for Electric Power Systems in
Commercial Buildings
5. IEEE 1015 - Recommended Practice for Applying Low-Voltage Circuit
Breakers Used in Industrial and Commercial Power Systems
6. IEEE 1584 - Guide for Performing Arc-Flash Hazard Calculations
B. American National Standards Institute (ANSI):
1. ANSI C57.12.00 - Standard General Requirements for Liquid-Immersed
Distribution, Power, and Regulating Transformers
2. ANSI C37.13 - Standard for Low Voltage AC Power Circuit Breakers Used
in Enclosures
3. ANSI C37.010 - Standard Application Guide for AC High Voltage Circuit
Breakers Rated on a Symmetrical Current Basis
4. ANSI C 37.41 - Standard Design Tests for High Voltage Fuses, Distribution
Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches and
Accessories
5. ANSI C37.5 - Methods for Determining the RMS Value of a Sinusoidal
Current Wave and Normal-Frequency Recovery Voltage, and for Simplified
Calculation of Fault Currents
C. The National Fire Protection Association (NFPA)
1. NFPA 70 - National Electrical Code, latest edition
2. NFPA 70E - Standard for Electrical Safety in the Workplace
3. SUBMITTALS
Submittals A, B, C, and E, Below, should be provided in PDF electronic format
for review by the District. The District will take about 10 to 12 calendar days to
review these submittals. After being finalized, these Submittals shall be included
within the appropriate section of the Final Study Report. The associated final
electronic, Microsoft, AutoCAD, Project, shall be submitted with the final Study
Report.
Submittal D shall be provided in the following formats: One (1) Hard Copy, one
(1) native software file (Microsoft, AutoCAD, electrical model output file, or other
original software file), and one PDF version. Provide photos in JPEG format. The
District will review Submittal D to confirm that comments, recommendations, and
suggested edits from previous work items have been incorporated.

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A. The short-circuit and protective device coordination study and Arc-flash analysis
for each station with engineering calculation(s) and/or model results.
B. Technical Memorandums. One (1) for each Pump Station.
C. Draft Study Report. The report shall include the following information and/or
sections, as appropriate:
1. Descriptions, purpose, basis of outcomes, and scope of the study
2. Tabulations of the worst-case calculated short circuit duties as a percentage
of the applied device rating (automatic transfer switches, circuit breakers,
fuses, etc.); the short circuit duties shall be upward-adjusted for X/R ratios
that are above the device design ratings
3. Protective device time versus current coordination curves with associated
one-line diagram identifying the plotted devices, tabulations of ANSI
protective relay functions and adjustable circuit breaker trip unit settings
4. Multi-function relay setting file printouts including all ANSI protective relay
functions and associated logic and control. Metering, communication, and
control logic settings not associated with ANSI protective functions are not
required.
5. Fault study input data, case descriptions, and current calculations including
a definition of terms and guide for interpretation of the computer printout.
6. Incident energy and flash protection boundary calculations.
7. Comments and recommendations for system improvements, repairs, and/or
corrections where needed. For every correction or repair, the Contractor
shall advise of priority, safety implication, outage risk, and affect of
dependability. The District is requesting a chart format to summarize these
items.
8. Summary including source of information and assumptions made.
9. One-line diagram showing protective device ampere ratings and associated
designations, cable size & lengths, transformer amperage & voltage ratings,
motor & generator ratings, and switchgear/switchboard/panelboard
designations
10. Attachments/Technical Memorandums.
D. Final Study Report. One (1) bound, hard-copy final report along with technical
memorandum for each pump station, attachments. complete final report shall be
submitted. In addition, a PDF and a Word Version electronic file will be provided.
E. Training Curriculum with Training Materials

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4. QUALIFICATIONS AND STUDY REPORT REQUIREMENTS
A. The short-circuit, protective device coordination and arc flash hazard analysis
studies, calculation, and/or modeling shall be conducted under the supervision
and approval of a registered professional engineer (California); experienced in
performing and interpreting the power system studies, performing electrical
calculations, and electrical engineering studies.
WORK PRODUCT
1. STUDIES
A. Contractor to furnish short-circuit and protective device coordination. The
coordination study shall begin with the utility company's feeder protective device
and include the electrical protective devices down to and include the largest
feeder circuit breaker and motor starter in the 240-volt motor control centers and
power distribution panelboards. The study shall also include variable frequency
drives, harmonic filters, power factor correction equipment, transformers and
protective devices associated with variable frequency drives, emergency and
standby generators associated paralleling equipment and distribution
switchgear.
B. The contractor shall furnish an Arc Flash Hazard Analysis Study per NFPA 70E -
Standard for Electrical Safety in the Workplace, reference Article 130.5 and
Informative Annex D.
2. DATA COLLECTION
A. Contractor shall furnish all field data as required by the power system studies
including a listing of required data.
B. Load data utilized may include existing and proposed loads obtained from the
District.
3. SHORT-CIRCUIT AND PROTECTIVE DEVICE EVALUATION STUDY
A. Use actual conductor impedances when possible. If unknown or cannot be
determined, use typical conductor impedances based on IEEE Standards 141,
latest edition.
B. Transformer design impedances and standard X/R ratios shall be used when
test values are not available.
C. Provide the following:
1. Calculation methods and assumptions
2. One-line diagram of the system being evaluated with available fault at each
bus, and interrupting rating of devices noted

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3. Source impedance data, including electric utility system and motor fault
contribution characteristics
4. Typical calculations
5. Tabulations of calculated quantities
6. Results, conclusions, and recommendations
D. Calculate short-circuit momentary and interrupting duties for a three-phase
bolted fault
at each:
1. Electric utility's supply termination point
2. Incoming switchgear
3. Unit substation primary and secondary terminals
4. Low voltage switchgear
5. Motor control centers
6. Standby generators and automatic transfer switches when present.
7. Branch circuit panelboards
8. Other significant locations throughout the system
E. For grounded systems, provide a bolted line-to-ground fault current study for
areas as defined for the three-phase bolted fault short-circuit study.
F. Protective Device Evaluation:
1. Evaluate equipment and protective devices and compare to short circuit
ratings
2. Adequacy of switchgear, motor control centers, and panelboard bus bracing
to withstand short-circuit stresses.
3. Adequacy of transformer windings to withstand short-circuit stresses
4. Cable and busway sizes for ability to withstand short-circuit heating.
5. Notify the District in writing, of existing, circuit protective devices improperly
rated for the calculated available fault current
4. PROTECTIVE DEVICE COORDINATION STUDY
A. Protective device coordination time-current curves shall be graphically displayed
on log-log scale paper. Determine the clearing time of the upstream protective
device (breaker or fuse) to establish the duration of each arc fault.

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B. Include on each curve sheet a complete title and one-line diagram with legend
identifying the specific portion of the system covered.
C. Terminate device characteristic curves at a point reflecting maximum
symmetrical or asymmetrical fault current to which device is exposed.
D. Identify device associated with each curve by manufacturer type, function, and, if
applicable, tap, time delay, and instantaneous settings recommended.
E. Plot the following characteristics on the curve sheets, where applicable:
1. Electric utility's protective device
2. Equipment relays
3. Fuses including manufacturer's minimum melt, total clearing, tolerance, and
damage bands
4. Equipment circuit breaker trip devices, including manufacturer's tolerance
bands
5. Transformer full-load current, magnetizing inrush current, and ANSI
transformer withstand parameters
6. Conductor damage curves
7. Ground fault protective devices, as applicable
8. Pertinent motor starting characteristics and motor damage points
9. Pertinent generator short-circuit decrement curve and generator damage
point.
F. Provide adequate time margins between device characteristics such that
selective operation is provided, while providing proper protection.
G. Select each primary protective device required so that the characteristics or
operating band is within the transformer parameters which includes a parameter
for the ANSI withstand point to afford protection for secondary line-to-ground
faults.
H. Separate circuit breakers from each other and the associated primary protective
device by a 16% current margin for coordination and protection in the event of
secondary line-to-line faults.
I. Engineer shall provide settings file printouts for all multifunction relays supplied
under this contract including all ANSI protective relay functions and associated
logic and control. Metering, communication, and control logic settings not
associated with ANSI protective functions are not required.
5. ARC FLASH HAZARD ANALYSIS
A. The arc flash hazard analysis shall be performed according to the IEEE 1584
equations that are presented in NFPA70E-2012, Informative Annex D.