Fairfield City Council
May 6, 2025

N-268-60-22-20-WP-TM3
At the NBRWTP, the source water is treated through a combination of pre-ozonation, flash mixing, flocculation-sedimentation, granular media filtration, and disinfection via free chlorine. Treatment residuals generated by the process are thickened and dewatered in sludge lagoons. A schematic of the NBRWTP facilities upstream of the filtration system is shown in Figure 1, and a schematic of the filters, post-ozonation, disinfection and treated water pumping facilities is shown in Figure 2.

Major facilities (or process areas) comprising the NBRWTP include the following:
• Treatment and Conveyance Facilities
— PSC Intake Structure and Metering
— NBA Turnout and Metering
— Raw Water Blending Structure
— Pre-Ozone Contactors
— Pretreatment Basins (Flash Mixing, Flocculation and Sedimentation) — Filters
— Post-Ozone Contactors
— Chlorine Contact Basin
— Treated Water Pump Station (TWPS)
— Washwater Recovery Basin
— Washwater Recovery Pump Stations
— Sludge Pump Station
— Sludge Lagoons
— Sludge Decant Pump Station
• Other Structures
— Bulk Chemical Storage Area
— Chemical Spill Containment Structure
— Operations Building and Chemical Metering Facility
— Ozone Generation Building
— Blower Building
— Electrical Buildings
A TM issued by Coastland DCCM in October 2023 titled “Revised Recommendations or Firm Capacity for Water Treatment Plants for 2023 Fairfield Water System Master Plan” (Coastland TM) presented conclusions and recommendations regarding both total and firm capacity at both the NBRWTP and its companion facility, the Waterman Water Treatment Plant (Waterman WTP). The Coastland TM concluded that while the NBRWTP has a nominal capacity of 40 mgd, due to its age and other factors, the current maximum reliable treatment capacity of the NBRWTP is approximately 32 mgd. Subsequently, Fairfield staff have agreed that efforts are necessary to rehabilitate or replace existing facilities, as appropriate, to bring the current maximum reliable treatment capacity of the NBRWTP back up to 40 mgd. These efforts are described in detail below in the section titled Capacity Rehabilitation Recommendations.

MMMM
HPR
SHC
LA
PEC
SP
SP
LA NBA RAW WATER NORTH BAY METER & VALVE VAULT AQUEDUCT PUTAH SOUTH CANAL METER VAULT AND VALVE VAULT PUTAH SOUTH CANAL OZONE DESTRUCTION TO ATMOSPERE SLUDGE PUMP STATION SLUDGE LAGOONS SLUDGE DECANT PUMP STATION WASHWATER RECOVERY BASINWASHWATER RECOVERY PUMP STATION WASHWATER SLUDGE PUMP STATION FLOCCULATION/SEDIMENTATION BASIN FLASH MIX FIG 2 FIG 2 FIG 2 WWR SLD SL SL SL OZ RW RAW WATER BLENDING PRE-OZONE CONTACTORS N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\26860-2220-Fig1-2.dwg 9/1/2023 8:19 AMrwalker City of Fairfield North Bay Regional Schematic Process Flow Diagram 1 of 2 Figure 1 Water Master Plan CLS Chlorine CS Caustic Soda HFS Hydrofluosilicic Acid HPR Hydrogen Peroxide LA Liquid Alum OZ Ozone PEC Cationic Polymer SHC Sodium Hypochlorite SP Spare Polymer LEGEND Chemical Additions AW Filter Air Wash BW Backwash RW Raw Water SL Sludge SLD Sludge Decant SW Settled Water TW Treated Water WW Washwater WWR Washwater Recovery Process Flows FIG 1 FIG 1 FIG 1
SHC
CS

HFS M M M POST-OZONATION CONTACT BASIN OZ BW BW SW OZ WW BWAW WW WW SW AW TW TW TREATED WATER PUMP STATION BACKWASH PUMPS TO VACAVILLE TO FAIRFIELD CHLORINE CONTACT BASIN OZONE DESTRUCTION FILTERS TO PRE- OZONE VAPORIZERS OZONE GENERATORS LOX STORAGE BLOWERS N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\26860-2220-Fig1-2.dwg 9/1/2023 8:23 AMrwalker CLS Chlorine CS Caustic Soda HFS Hydrofluosilicic Acid HPR Hydrogen Peroxide LA Liquid Alum OZ Ozone PEC Cationic Polymer SHC Sodium Hypochlorite SP Spare Polymer LEGEND City of Fairfield North Bay Regional Schematic Process Flow Diagram 2 of 2 Figure 2 Water Master Plan Chemical Additions AW Filter Air Wash BW Backwash RW Raw Water SL Sludge SLD Sludge Decant SW Settled Water TW Treated Water WW Washwater WWR Washwater Recovery Process Flows TM – City of Fairfield
May 24, 2024

N-268-60-22-20-WP-TM3
In addition, the Coastland TM recommended that Fairfield adopt a policy whereby “firm capacity” is defined as equaling 90 percent of the maximum reliable treatment capacity of the overall facility, and that this multiplier would only be applied to the larger of Fairfield’s water treatment facilities (the NBRWTP).

Fairfield staff have agreed to this policy, and the capacity assumptions of this analysis reflect that approach. However, because firm capacity is typically defined as the overall facility capacity with the largest units out of service, this TM uses the terms “available capacity” rather than firm capacity.

WATER QUALITY CHARACTERIZATION AND PERFORMANCE ASSESSMENT In conducting an assessment of the NBRWTP performance, the following key water quality parameters were analyzed:
• Raw and Filtered Water TOC
• Raw Water TDS
• Settled and Filtered Water Turbidity
• Treated Water pH and Temperature
• Treated Water Chlorine Residual
• CT Ratio
• Washwater Return Turbidity
• Finished Water DBPs
Raw and Filtered Water TOC
Total organic carbon (TOC) is an indicator of disinfection byproduct (DBP) formation potential. Water quality regulations require that TOC be removed according to the removal percentages shown in Table 1.

Existing data indicate that the NBRWTP reliably removes TOC in excess of the minimum requirements.

These results are based on a total of 67 data points where simultaneous source water TOC and alkalinity and finished water TOC were measured, plus an additional 42 data points where simultaneous source water TOC and finished water TOC were measured in the absence of any alkalinity measurements.

It should be noted that the NBRWTP has historically minimized or avoided treating NBA source water when the measured TOC of that source exceeds approximately 8 NTU. During periods in which the NBRWTP is treating exclusively PSC water, NBA water TOC is not measured.

In addition to measuring raw and filtered water TOC, Fairfield also measures ultraviolet (UV) absorbance of those same streams. UV absorbance serves as a surrogate for TOC. However, the relationship between the two parameters is not perfectly correlated; moreover, no regulatory requirements apply to UV absorbance, whereas such requirements do apply to TOC. For these reasons, the UV absorbance results at the NBRWTP are not considered further in this analysis.

TM – City of Fairfield
May 24, 2024

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Table 1. TOC Removal Performance at the NBRWTP, 2018–2022 Source Water
TOC, mg/L
Source Water Alkalinity, mg/L as CaCO3
0–60 >60–120 >120 Not available
Required Minimum TOC Removal, percent
> 2.0 – 4.0 35 25 15 no applicable standard
> 4.0 – 8.0 45 35 25 no applicable standard
> 8.0 50 40 30 no applicable standard
Actual TOC Removal at the NBRWTP, percent
> 2.0 – 4.0 (a) 48.7–70.1 35.4–62.4 49.6–65.3
> 4.0 – 8.0 (a) 51.5–70.7 54.0–74.5 48.3–61.2
> 8.0 (a) (b) (b) 61.3–76.6
(a) Source water alkalinity routinely exceeds 60 mg/L as CaCO3. For the 128 data points from 2018 through 2022, alkalinity values ranged from 60 mg/L as CaCO3 to 191 mg/L as CaCO3.
(b) Reported source water TOC rarely exceeds 8.0 mg/L due to the aforementioned practice of discontinuing diversions from the NBA when TOC is high. From 2018 through 2022, a total of 4 out of 110 measurement exceeded 8.0 mg/L TOC. No raw water alkalinity measurements are available for those dates.

Raw Water TDS
Total dissolved solids (TDS) is a parameter that is subject to a secondary drinking water maximum contaminant level (MCL) of 500 mg/L for taste and aesthetics. In general, TDS is neither added nor removed to any significant degree through any of the NBRWTP treatment processes; therefore, raw water TDS concentrations are a reliable indicator of finished water TDS.

Raw water TDS statistics for the period of 2018 through 2022 are summarized in Table 2. As indicated, on average, the PSC raw water is higher in TDS than the NBA raw water; however, the NBA raw water is approximately twice as variable in its TDS content (as indicated by the standard deviation).

Table 2. Summary Statistics for Raw Water TDS, 2018–2022(a) Statistic Units PSC NBA
Data Count -- 19 20
Average mg/L 205 161
Minimum mg/L 167 108
Maximum mg/L 255 254
Standard Deviation mg/L 24.9 52.7
(a) A total of nine TDS values were measured in the PSC when PSC diversions were 0 mgd, while a total of eight TDS values were measured in the NBA when NBA diversions were 0 mgd. These values are excluded from consideration.

TM – City of Fairfield
May 24, 2024

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Settled and Filtered Water Turbidity
Applicable standards exist for both settled and filtered water turbidity. For settled water, the goal established by the California Cryptosporidium Action Plan is to achieve a turbidity below 2 NTU in the effluent of the sedimentation basin at all times. For filter effluent, the following standards apply, per 40 CFR 141.718:
• Combined filter effluent turbidity must be less than or equal to 0.15 NTU in at least 95 percent of the measurements.
• Filtered water turbidity for each individual filter must be less than or equal to 0.15 NTU in at least 95 percent of the measurements recorded each month. • No individual filter may have a measured turbidity greater than 0.3 NTU in two consecutive measurements taken 15 minutes apart.

For this analysis, data were analyzed for the period of 2018 through 2022. The results for settled water are shown in Figure 3. As indicated, the only observed exceedances during the five-year period in question all occurred in February 2019 and in December 2021, during which extreme rainfall and unusually high flows (and associated turbidity) occurred in the rivers and creeks from which the NBRWTP receives its water supplies. During those two periods, a total of 17 exceedances occurred out of a total of 4,832 data points during the five-year period, for an overall exceedance percentage of 0.35 percent.

The results for the filter effluent turbidity are summarized in Table 3. As indicated, the individual filters have only exceeded the 0.15 NTU standard eleven times out of a total of 12,194 measurements (0.09 percent), while the combined effluent never exceeded the 0.15 NTU standard out of a total of 1,826 measurements.

These results indicate exceptionally reliable filter performance during the period in question.

Figure 3. Settled Water Turbidity, 2018–2022
TM – City of Fairfield
May 24, 2024

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Table 3. Summary Statistics for Filtered Water Turbidity, 2018–2022 Data Set
Measured Turbidity, NTU (a)
Data Count
Count
Minimum Median Maximum >0.15 NTU
Filter #1 0.01 0.04 0.17 918 1
Filter #2 0.02 0.04 0.30 857 1
Filter #3 0.02 0.04 0.30 898 1
Filter #4 0.01 0.03 0.30 925 1
Filter #5 0.02 0.04 0.30 920 1
Filter #6 0.02 0.03 0.30 914 3
Filter #7 0.02 0.04 0.30 898 2
Filter #8 0.02 0.03 0.30 930 1
Combined 0.03 0.06 0.13 1,096 0
(a) Based on the maximum reported turbidity values for each day in which measurements were taken Treated Water pH and Temperature
Treated water pH and Temperature are recorded daily at the NBRWTP and are important parameters for the sizing of any future chlorine contact basin facilities. A summary of the data for the period of 2018 through 2022 is presented in Table 4. As expected, a seasonal trend exists for temperature, though not for pH. (Two temperature readings above 30°C were removed due to being clearly anomalous.) Table 4. Summary Statistics for Filtered Water Temperature and pH, 2018–2022 Month
Filtered Water Temperature, °C Filtered Water pH, standard units Minimum Maximum Average Minimum Maximum Average
January 6.9 12.8 9.9 7.92 8.46 8.25
February 8.5 14.3 11.1 7.90 8.46 8.26
March 9.8 17.1 13.2 7.81 8.42 8.18
April 12.7 20.0 16.0 7.98 8.38 8.22
May 15.1 21.9 18.7 7.95 8.34 8.17
June 15.8 23.6 20.1 7.98 8.38 8.22
July 16.5 23.8 20.3 8.01 8.40 8.21
August 16.3 24.3 19.8 8.07 8.40 8.22
September 16.2 23.5 19.1 8.08 8.43 8.26
October 11.8 21.5 16.2 7.98 8.37 8.22
November 8.3 17.0 13.1 8.07 8.44 8.27
December 7.8 12.9 9.9 7.98 8.46 8.29
Overall 6.9 24.3 15.6 7.81 8.46 8.23
TM – City of Fairfield
May 24, 2024

N-268-60-22-20-WP-TM3
Chlorine Residual
Chlorine residual readings at the NBRWTP are measured daily downstream of the post-ozone contact basin, and at the downstream end of the chlorine contact basin. The chlorine residual in the water entering the distribution system is required to be maintained between 0.2 mg/L and 4.0 mg/L. Chlorine residual results are relevant to the sizing of any future chlorine contact basin facilities because a higher chlorine residual requires less contact time to achieve the same disinfection as a lower chlorine residual.

Therefore, understanding the typical chlorine residual value allows for selection of a contactor volume that will ensure the required disinfection is achieved. The minimum, maximum and average values recorded at the NBRWTP are as follows:
• Minimum: 1.09 mg/L
• Maximum:1.50 mg/L
• Average 1.31 mg/L
It should be noted that a value of 0.86 mg/L was collected on January 15, 2019, and was excluded from consideration due to being an anomalous value.

CT Ratio
CT is calculated by multiplying the free chlorine residual concentration (C) measured at the end of the contact period by the time (T or T10) it takes for 10 percent of the water to exit the chlorine contactor. The CT ratio is defined as the ratio of the CT achieved within the disinfection contactor and the CT required to achieve primary disinfection. The CT ratio must be greater than 1.0 to ensure that primary disinfection is being reliably achieved and to achieve the regulatory requirements for primary disinfection. The overall CT ratio at the NBRWTP considers the total combined T10 time in the chlorine contact basins, the TWPS, and subsequent piping between the WTP and the first customer.

CT ratio values are calculated daily at the NBRWTP. Based on a review of the data covering the period of 2018 through 2022, the minimum observed CT ratio was 3.2, which is in excess of the required minimum of 1.0. CT ratios at the NBRWTP and are typically in the range of 5.0 to 8.0, with the lower values in that range occurring during the high demand months. During periods of reduced plant operations (generally for scheduled maintenance activities, which typically occur in the low demand months), CT ratios may be substantially higher than the normal range.

Washwater Return Turbidity
Washwater return flow and turbidity are measured daily at the NBRWTP. According to the Cryptosporidium Action Plan (State Water Resources Control Board, Division of Drinking Water, April 2019): “An operational goal of less than 2.0 NTU should be established for the backwash water returned to the headworks of the treatment plant. Use of coagulant chemicals to assist in the solids separation is advisable and usually necessary to meet the 2.0 NTU goal.” The washwater return turbidity at the NBRWTP routinely exceeds this guideline. Key washwater return turbidity statistics for the period of 2018 through 2022 are shown below. Four occurrences of 0 NTU are excluded from the data set due to likely being anomalous readings. • Minimum: 3.1 NTU
• Maximum: 200 NTU
• Median: 64 NTU
• Data Count: 1,822
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May 24, 2024

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Given these findings, Fairfield should plan to install a washwater treatment system to improve solids separation and reduce the turbidity of water recycled to the head of the plant to values below 2 NTU.

Finished Water DBPs
The US Environmental Protection Agency (EPA) and the State of California maintain primary drinking water maximum contaminant levels (MCLs) for DBPs, including for total trihalomethanes (TTHMs) and for five haloacetic acids (HAA5) of 0.080 mg/L and 0.060 mg/L, respectively. Table 5 summarizes the results of quarterly samples collected at eight locations throughout the Fairfield water distribution system. As indicated in the table, the results are consistently in compliance with the existing MCLs. In the case of TTHMs, a total of three values out of 166 have exceeded 0.070 mg/L over the period of 2018 through 2022, thereby approaching but not exceeding the 0.080 mg/L standard. It should also be noted that the regulations are based on a running annual average for each sampling location, such that even a single sample exceeding the MCL would not necessarily equate to a violation of the standard.

Table 5. Summary Statistics for Treated Water TTHMs and HAA5 (a) Statistic(a) TTHMs, mg/L HAA5, mg/L
MCL 0.080 0.060
Average 0.038 0.0098
Minimum 0.015 0.0035
Maximum 0.077 0.032
(a) Based on data from eight sampling locations: Huntington Court, Arlington Circle, Bridge Valve Vault, Pebble Beach Circle, Eastridge Station, Leafwood Court, Dawson Creek Drive, and Gregory Street. The data period is 2018–2022 for TTHMs and 2019–2022 for HAA5.

EMERGING REGULATIONS
In addition to the parameters discussed in the previous section, a series of new regulations involving water quality parameters of potential concern are being contemplated or are expected to be issued, which may require modifications or additions to existing treatment processes. Notable water quality parameters of interest include:
• DBPs
• PFAS
• Manganese
• Cyanotoxins
• Microplastics
The effects of existing and emerging drinking water regulations are described in detail in Chapter 4 of the Master Plan. Key concerns relevant to this assessment are summarized in this section.

DBPs
US EPA is contemplating a revision to existing disinfection byproduct rules that may include increasing TOC removal requirements, developing more stringent standards for both TTHMs and HAA5, establishing standards for all nine of the chlorinated and brominated haloacetic acids (HAA9), and/or establishing standards for specific disinfection byproduct TTHM species. Since Fairfield’s water supply is entirely surface water, and given that surface waters typically have significantly higher TOC levels than groundwater TM – City of Fairfield
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supplies, the impacts from these potential regulation changes could be substantial and could obligate Fairfield to implement modified or additional treatment processes (e.g., increased removal of TOC in the pretreatment process). Fairfield should consider expanding its DBP sampling to evaluate DBP speciation within the distribution system.

PFAS
New federal regulations for per- and polyfluoroalkyl substances (PFAS) are anticipated to be finalized by EPA in December 2023, and will be enforceable 36 months later. Fairfield should begin monitoring for and quantifying the presence of the six PFAS species included in the new regulations to prepare for the upcoming regulation and to help identify any mitigation that may be required. Treatment process improvements could include replacing granular activated carbon (GAC) filter media more frequently.

Manganese
Manganese is one of the 15 contaminants included in EPA's National Secondary Drinking Water Regulations, which are non-mandatory water quality standards established as guidelines to assist public water systems in managing their drinking water for aesthetic considerations, such as taste, color, and odor. The secondary MCL for manganese is 0.05 mg/L, whereas treated water samples from Fairfield’s water treatment plants over the past 10 years have typically ranged between non-detect and 0.02 mg/L.

EPA has indicated that development of an updated health assessment for manganese is ongoing, although no schedule for public review has been released. It is therefore possible that the updated health assessment could trigger the establishment of a primary (enforceable) MCL for manganese.

Cyanotoxins
EPA has developed two distinct Health Advisories for the cyanotoxins microcystins and cylindrospermopsin for two population groups:
• The 10-day health advisories for sensitive populations (i.e., infants, elderly, pregnant mothers, etc.) are 0.3 ppb for microcystins and 0.7 ppb for cylindrospermopsin • The 10-day health advisories for the general adult population are 1.6 ppb for microcystins and 3.0 ppb for cylindrospermopsin
While the EPA published Health Advisories are not federally enforceable, Fairfield should consider monitoring for these cyanotoxins in the source water and treated water, particularly during times when algae species may be present in untreated source water, such as during the spring and summer months.

Note that treatment processes may release cyanotoxins from algae cells due to lysing of the cells; therefore, absence of cyanotoxins in untreated source water does not necessarily mean that cyanotoxins will be absent from treated water.

Microplastics
As defined by State Water Resources Control Board, Resolution No. 2020-0021, Adoption of Definition of ‘Microplastics In Drinking Water’, microplastics are defined “solid, polymeric materials to which chemical additives or other substances may have been added, which are particles which have at least two dimensions that are greater than 1 and less than 5,000 micrometers (µm). Polymers that are derived in nature that have not been chemically modified (other than by hydrolysis) are excluded”. In addition, the State has adopted a standard methodology for testing and reporting microplastics in drinking water. As indicated in the Policy Handbook Establishing a Standard Method of Testing and Reporting of Microplastics in Drinking Water (August 2022, Division of Drinking Water, State Water Resources Control Board), TM – City of Fairfield
May 24, 2024

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Fairfield has been identified as one of the water systems that will potentially be asked to participate in microplastics monitoring during Phase 1, which is anticipated to begin in Fall 2023 and conclude in Fall 2025. At a minimum, water systems are anticipated to be required to report concentrations of microplastics that are 50 micrometers long or the minimum size listed in the standard method utilized by the laboratory for analysis, whichever is smaller.

ON-SITE CONDITION ASSESSMENT
The West Yost project team performed onsite, visual-based condition assessments of critical assets on February 24 and March 2, 2023. Critical assets generally include structures, major mechanical equipment, major electrical equipment, and major instrumentation and controls systems elements. The methodology and results of the condition assessment are summarized in the following sections:
• Assessment Methodology and Procedures
• Condition Rating Criteria
• Condition Assessment Results and Recommendations
The results of the condition assessment were also used to develop the NBRWTP risk assessment (described in the next section of this TM). Together, the condition and risk assessments were used to develop a prioritized list of age-, condition-, and operations-based capital improvements for the NBRWTP, presented in the last section of this TM.

Assessment Methodology and Procedures
In addition to visual inspection of assets, the condition assessment of the NBRWTP consisted of the following steps: (1) review of existing drawings and computerized maintenance management system (CMMS) asset databases; (2) operational interviews with operation and maintenance (O&M) and engineering staff, and (3) a seismic risk assessment conducted by TJC and Associates using information collected during review of as-builts and the on-site inspection. Each of these steps is further described below.

Review of Existing Drawings and Asset Information
The following drawings and documents were received from Fairfield and reviewed as a part of the assessment:
• 1988 Construction of North Bay Regional Water Treatment Plant (James M. Montgomery) • 2011 North Bay Regional Water Treatment Plant Improvements Project (MWH) • 2013 North Bay Regional Water Treatment Plant Condition Assessment (Kennedy/Jenks) • 2018 North Bay Regional Water Treatment Plant SCADA System Improvements Project (Kennedy/Jenks)
• 2021 North Bay Regional Water Treatment Plant Ozone System Improvements (West Yost) • 2023 Asset Hierarchy (NBRWTP CMMS Export)
The information gathered from the review of these sources was prioritized by published year of the drawing or document. Where multiple documents contained information about a given asset, later documents were assumed to have the most up-to-date information and were used to develop the asset registry.

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May 24, 2024

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Operational Interviews
Fairfield operations and maintenance staff were interviewed during the on-site assessment by the condition assessment team to gain insight on the O&M history and routine upkeep of the NBRWTP. Topics discussed included the following:
• Maintenance and repair history of major equipment items • Routine maintenance activities and associated frequency • Operation and performance of critical assets and processes • Satisfaction with the operational capabilities of various assets • Emergency response operations
Seismic Risk Assessment
TJC and Associates completed a seismic risk assessment (ASTM E2026) and Tier 1 screening (ASCE/SEI 41) of the NBRWTP. The Tier 1 procedure is used to identify potential seismic deficiencies in the structural lateral force-resisting system and non-structural building systems. The evaluation was completed primarily using record drawings in conjunction with a visual site inspection. The methods used for this evaluation, as well as its inherent limits, were documented in a TM included herein as Appendix A (Condition Assessment of North Bay Regional Water Treatment Plant, ASTM E2026, ASCE/SEI 41, and FEMA P-154).

Condition Rating Criteria
The condition assessment team assigned a condition rating to each critical asset based on field observations, notes from discussions with O&M and engineering staff, photographs, and videos. Numerical ratings were selected from the standardized condition assessment rating systems defined in Table 6.

Table 6. Rating Criteria used in the NBRWTP Condition Assessment Condition
Rating
Level
Grading
Definition Structural Mechanical Electrical
Instrumentation &
Controls
1 Excellent New condition; No
damage to concrete
New condition
2 Good
Little to no corrosion;
minimal damage to
concrete
Minor cosmetic
surface abrasion or
coating
deterioration
Cosmetic surface
defects with no
impact on
performance
Cosmetic surface
defects with no impact
on performance
3 Fair
Minor surface
corrosion; damage to
concrete mortar
Average surface or
structural wear and
tear
Average physical wear and tear
4 Poor
Moderate to
significant corrosion;
loss of concrete
mortar/damage
to rebar
Moving parts show
excessive wear and
tear and require
rehabilitation within
two years or less
Above average wear and tear and/or
equipment is no longer available as new
from the manufacturer and will require
replacement within five years or less
5 Requires
Immediate
Attention
Severe corrosion;
significant damage to
structure; Immediate
repair/ replacement
needed
Physical condition is
beyond acceptable
level and needs
immediate
replacement
Physical condition is beyond acceptable level
and/or asset replacement equipment is no
longer available and needs immediate
replacement
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Condition Assessment Results and Recommendations
This section summarizes the results and high-level observations and recommendations of the condition assessment. An overall summary of major condition and operations-based observations is presented, followed by additional discussion of results presented in order of process area (e.g., pretreatment, filtration, disinfection, etc.). Representative photographs, organized by process area, are provided in Appendix B.

Overall Summary of Condition Assessment Observations
In general, the NBRWTP is well-maintained and in fair condition. Major observations of note include the following:

1. All original motor control centers (MCCs) have exceeded their anticipated useful lives and are due for replacement.

2. All original bulk chemical storage tanks have exceeded their anticipated useful lives and are due for replacement.

3. A variety of major mechanical equipment is original (>30 years old) and has generally reached the end of its anticipated useful life. The useful lives of these items have been extended through inspection and periodically reconditioning. This practice is acceptable for as long it remains cost effective and maintains satisfactory performance. Mechanical equipment items in question include:
• Pumps (flash mix, treated water, backwash)
• Flocculation mixers
• Sludge collector drives

4. Significant corrosion exists within the NBA metering vault due to longstanding leakage across pipe penetrations; correction of this deficiency is the responsibility of the Department of Water Resources. Corrective work is planned for 2023.

5. Washwater equalization facilities are inadequate to meet recycled washwater turbidity objectives. Additionally, available washwater equalization volume is inadequate during challenging water quality periods and thereby limits effective filtration capacity.

6. The design of the sludge lagoon decant pump station results in nearly continuous operation, placing stress on the system. This system should be evaluated for improvements, which may include replacement of the wet well, pumps, and/or discharge piping.

Process Area 01 – Operations Building
The physical structures and assets in the operations building are generally in fair condition with asset and discipline-specific ratings ranging from excellent to poor condition. High-level recommendations related to major assets are as follows:
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities; specifically, address different lateral force-resisting systems between the occupied and unoccupied portions of the structure and the corresponding potential for different portions of the building to collide with one another during an earthquake. • Complete in-progress laboratory upgrade.

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• Consider replacement of remaining original HVAC equipment, which has exceeded its anticipated useful life. Replacement is advised if and when the building is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.
• Replace original MCCs 1M and E1M, which have exceeded their anticipated useful lives. • Replace limited instruments that have exceeded their anticipated useful lives (specifically, AIT-106A should be replaced when the latest model is available).

No operations-based recommendations were identified for this process area.

Process Area 02A – Putah South Canal Intake and Metering The physical structures and assets in the Putah South Canal intake and metering area are generally in fair condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of original (1988) valves and actuators, which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.
• Replace original (1988) flow meters, which have exceeded their anticipated useful lives. • Consider replacement of original (1988) HVAC equipment inside the metering vault, which has exceeded its anticipated useful life. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.

The following operations-based recommendations were identified for this process area:
• Consider installation of a second screening system for redundancy.

Process Area 02B – North Bay Aqueduct Turnout and Metering The physical structures and assets in the North Bay Aqueduct turnout and metering area are generally in fair condition with asset-specific ratings ranging from excellent to poor condition. High-level recommendations related to critical assets are as follows:
• Repair large diameter existing pipe penetrations to arrest leakage (this work is scheduled to be completed by DWR in 2023).
• Repair and recoat piping in vicinity of historical leakage to address the resulting corrosion. • Repair or replace corroded galvanized pipe supports.

No operations-based recommendations were identified for this process area.

Process Area 02C – Raw Water Blending
The physical structures and assets in the raw water blending area are generally in excellent condition with asset-specific ratings ranging from excellent to good condition. As a relatively new structure (constructed in 2020), there are no condition or operations-based recommendations for this process area.

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Process Area 03 – Pre-Ozonation
The physical structures and assets in the pre-ozonation area are generally in good condition with asset-specific ratings ranging from excellent to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of original (1988) large diameter valves, which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is schedule for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.
• Replace original (1988) MCC-3M, which has exceeded its anticipated useful life. • Address minor corrosion at small diameter stainless steel ozone piping by replacing uncoated carbon steel hardware with stainless steel hardware.

No operations-based recommendations were identified for this process area.

Process Area 04 – Pretreatment
The physical structures and assets in the pretreatment area are generally in fair condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of original (1988) valves at the flash mix area and flocculation basins, which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended. • Replace original (1988) VFDs for flocculation mixers, which have exceeded their anticipated useful lives.
• Replace original (1988) MCC-4EM, which has exceeded its anticipated useful life. • Replace corroded HVAC straps within the flash mix vault. • Replace original (1988) redwood baffles in the flocculation basins, which have exceeded their anticipated useful lives and have begun to exhibit signs of degradation. • Continue regular inspection and reconditioning of original (1988) flocculation mixer and sedimentation basin chain and flight drives; replace equipment when reconditioning ceases to be cost-effective, or effective in maintaining suitable performance. • Provide lateral bracing for MCC building HVAC equipment.

The following operations-based recommendations were identified for this process area:
• Consider stress testing the pretreatment system by operating one or more trains at flows of up to 13.3 mgd each to assess flocculation and sedimentation performance. Performance data at these unit flow rates may aid Fairfield during preliminary design of a future pretreatment system expansion.

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Process Area 05 – Filtration
The physical structures and assets in the filter area are generally in fair condition with asset-specific ratings ranging from excellent to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of remaining original (1988) large diameter valves (e.g., for combined filter effluent), which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended. • Replace or repair remaining large diameter Victaulic couplings; if replacement gaskets cannot be sourced, switch to an alternative takedown coupling style. • Replace original (1988) MCC-5EM, which has exceeded its anticipated useful life. • Coat or recoat existing corroded galvanized steel pipe and instrument supports. • Recoat flanged piping hardware (bolt and nuts) at connections dismantled during previous improvement projects.
• Identify and eliminate leaking through conduits between filter deck and MCC and spare parts rooms.
• Conduct Tier 2 seismic assessment of filter control room to determine if bracing is required.

The following operations-based recommendations were identified for this process area:
• Increase washwater equalization basin volume to increase operational flexibility for conducting filter backwashes.
• Replace existing filter underdrains with Leopold-style underdrains to improve filter backwashing performance, and to promote consistency with the likely design of future filters; this improvement should be timed to coincide with filter media replacements, or with expansion of the filter facility.
• Modify gallery to accommodate larger floor-level access doorway on east end of the gallery.

Process Area 06 – Post-Ozonation
The physical structures and assets in the post-ozonation area are generally in poor condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of remaining original (1988) large diameter valves, which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended. • If DDW is amenable, remove existing ozone-related equipment (e.g., ozone destruct units, off-gas blowers, purge blower) and terminate all related electrical, instrumentation and piping connections.
• Replace original (1988) MCCs 6EMA and 6EMB, which have exceeded their anticipated useful lives.
• Investigate reported corrosion on the torsion bar for the contactor effluent valves.

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The following operations-based recommendations were identified for this process area:
• To provide additional CT and to reduce the amount of future chlorine contact volume required, relocate the existing sodium hypochlorite injection location to the upstream end of the contactors.

Process Area 07 – Treated Water Pump Station
The physical structures and assets in the TWPS area are generally in fair condition with asset-specific ratings ranging from excellent to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of remaining original (1988) large diameter isolation valves (primarily butterfly valves) and gearboxes, which have exceeded their anticipated useful lives.

Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.
• Replace original (1988) MCCs 7EM1 and 7EM2, which have exceeded their anticipated useful lives.
• Continue regular inspection and reconditioning of original (1988) treated water and backwash pumps; replace equipment when reconditioning ceases to be cost-effective, or ceases to be effective in maintaining suitable performance. • Provide lateral bracing for MCC building HVAC equipment.

No operations-based recommendations were identified for this process area.

Process Area 08 – Ozone Generation Building and LOX Storage Area The physical structures and assets in the ozone generation building and liquid oxygen (LOX) storage area are generally in fair condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities.
• Replace original (1988) MCCs 8M, 8MA, and 8MB, which have exceeded their anticipated useful lives.
• Consider replacement of original (1988) HVAC equipment items (generally exhaust fans and hydronic heaters), which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended. • Address minor corrosion at base plates of horizontal LOX storage vessels. • Among the shelves in original oxygen gas preparation room, provide restraints for equipment greater than 20 pounds and higher than four feet from the floor.

The following operations-based recommendations were identified for this process area:
• Complete an ongoing feasibility evaluation of the use of onsite oxygen generation systems as a potential means of reducing LOX costs.

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Process Area 09 – Blower Building
The physical structures and assets in the blower building area are generally in fair condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities.
• Replace original (1988) MCCs 9M and 9EM, which have exceeded their anticipated useful lives.
• Continue regular inspection and maintenance of original (1988) positive displacement blowers; replace equipment when maintenance contract ceases to be cost-effective, or effective in maintaining suitable performance. If not before, replace the original blowers as a part of a future NBRWTP expansion, and consider variable speed blowers for replacement units. • Remove existing boiler-related equipment and terminate all related electrical, instrumentation and piping connections.

No operations-based recommendations were identified for this process area.

Process Area 10 – Chemicals
The physical structures and assets in the chemicals area, which includes both the bulk storage tank farm, the chemical spill containment basins, and the chemical metering room within the Operations Building, are generally in fair condition with asset-specific ratings ranging from excellent to “requires immediate attention” condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of original (1988) chemical storage tanks, which have exceeded their anticipated useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.
• Replace existing chemical recirculation pumps.
• Replace exposed outdoor chemical piping between storage tanks and chemical metering room, including both steel and PVC piping.
• Provide weather protection structure for hydrogen peroxide metering pumps. • Replace insulation at outdoor eyewash and shower units. • Address corrosion and recoat deck-mounted baseplate for Vanton pump serving chemical spill containment basins.

The following operations-based recommendations were identified for this process area:
• To improve access and maintainability, relocate or replace sodium hypochlorite metering pumps to allow for pedestal mounting and to eliminate the existing manufacturer-provided skid.

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Process Area 11 – Washwater Recovery
The physical structures and assets in the washwater recovery area are generally in good condition with asset-specific ratings ranging from excellent to poor condition. High-level recommendations related to critical assets are as follows:
• Replace original (1988) MCC 11M, which has exceeded its anticipated useful life. • Replace original (1988) 500-gpm washwater return pumps, which have reached the end of their useful lives; alternatively, conduct periodic inspection and reconditioning to extend the life of the original pumps.
• Continue regular inspection and reconditioning of original (1988) 2,000-gpm washwater return pump; replace unit when reconditioning ceases to be cost-effective, or effective in maintaining suitable performance.

The following operations-based recommendations were identified for this process area:
• Increase washwater equalization basin volume to increase operational flexibility for conducting filter backwashes and reduce incidence of washwater overflows. • Install washwater clarifiers to improve (reduce) the turbidity of recycled washwater.

Process Area 12 – Sludge Lagoon
The physical structures and assets in the sludge lagoon area are generally in fair condition with asset-specific ratings ranging from good to poor condition. High-level recommendations related to critical assets are as follows:
• Consider replacement of original (1988) small-diameter valves, which have reached the end of their useful lives. Replacement is advised if and when the process area is scheduled for expansion or other significant modification. In the interim, increased inspection and maintenance of the equipment is recommended.

The following operations-based recommendations were identified for this process area:
• Evaluate existing lagoon decanting operation to identify causes of near-continuous pump station operation (e.g., undersized pumps, undersized discharge piping capacity, etc.), and modify existing pump station; modifications may include a combination of new, larger wet well; new, larger pumps; and/or new, larger diameter discharge piping.

Process Area 13 – Warehouse Building
The physical structures and assets in the warehouse building area are generally in good condition with asset-specific ratings ranging from good to fair condition. High-level recommendations related to critical assets are as follows:
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities
• Among the warehouse shelving, provide restraints for equipment greater than 20 pounds and higher than four feet from the floor
No operations-based recommendations were identified for this process area.

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RISK ASSESSMENT
Critical asset condition, performance, and age information collected during the NBRWTP site visits was used to populate the West Yost Asset Management Model (WAMM). The WAMM is a risk model used to prioritize system repairs and equipment replacement that takes into account both likelihood of failure (LOF) ratings and consequence of failure (COF) ratings to quantify the risks associated with each asset and each process area.

The risk assessment results presented in this section are consistent with the results presented in On-Site Condition Assessment section above. These results will be used as the basis for prioritization of capital improvements described in the Recommended Capital Improvements section later in this TM. (Note that capital improvement project costs and prioritization will be presented in Chapter 9 [Capital Improvement Program] of the Master Plan Report).

Key topics addressed in this section include:
• Asset Risk Methods
• Asset Risk Results
• Process Area Risk Methods
• Process Area Risk Results
The methods used in this risk assessment are consistent with those developed in the City of Fairfield Potable Water Pump Station Asset Management Plan1. The general approach used in the risk assessment is illustrated in Figure 4. As indicated in the figure, the LOF of a process area is a function of the LOF results for the individual assets within that process area, as described in this section.

Figure 4. NBRWTP Risk Assessment Methodology
1 Originally published in 2015, and subsequently updated in April 2023 Asset Risk
Asset LOF Asset COF
Process Area LOF Process Area COF
Process Area Risk
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Asset Risk Methods
This section describes the methods used to perform the LOF and COF analyses and to determine the resulting risk level for each individual asset at NBRWTP.

Asset LOF
The LOF analysis considers the probability that a failure will occur in a given asset. The analysis includes two distinct “failure modes”, specifically Physical Mortality (i.e., outright physical asset failure) and Level of Service (i.e., the asset fails to meet its intended use). The factors considered in assessing each of these failure modes are presented in Table 7.

Table 7. Criteria Used for Asset LOF Evaluation
Failure Mode Criteria/Factor Description
Physical Mortality
Percent of Useful Life
Remaining
This criterion takes into account the fact that older assets are more likely to fail than newer ones due to the age of
materials and wear from repeated use. The percent of useful life remaining was determined by comparing the number of remaining years estimated during the field assessments to the industry standard lifetime for each asset.

Condition Rating
An asset with visible degradation is more likely to fail. While condition and age are often interdependent, newer
components may be in poor condition due to environmental conditions or inadequate maintenance. Condition ratings were assigned to assets during the on-site condition assessment.

Level of Service Performance Rating
An asset that does not perform as designed or intended is a level of service failure. Something does not have to physically happen to the asset for level of service failure to occur.

The performance of an individual asset may affect the level of service of the process area, depending on the role of that asset in day-to-day operations. Performance ratings were assigned to assets based on information obtained during the on-site condition assessment.

The LOF factors above are translated into numeric rankings of 1 to 5, with 5 indicating the highest LOF score. An overall LOF score is determined by adding the higher of the two ratings for Percent of Useful Life Remaining and Condition Rating, and then adding that value to the ranking for Performance Rating.

As a result, each asset will have an overall LOF score of between 2 and 10. The factors and their range of potential ratings for each category are presented in detail in Table 8.

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Table 8. Asset LOF Rating Factors
Failure Mode
Criteria/
Factor
Rating
1 2 3 4 5
Physical Mode
Percent of Useful
Life Remaining ≥ 70% 40% to 69% 10% to 39% 5% to 9% ≤ 5% Condition Rating Excellent Slight Visible
Degradation
Visible
Degradation
Integrity
Moderately
Compromised
Integrity
Severely
Compromised
Level of Service Performance
Rating
Functioni
ng as
Intended
In Service, but
Higher than
Expected O&M
Costs
In Service,
but Function
is Impaired
In Service, but
Function is
Highly
Impaired
Not
Functioning
as Intended
Asset COF
The COF analysis considers the impact that the failure of a given asset may have on the process area as a whole. For each category, the criteria considered in determining the potential consequence of a failure are presented in Table 9.

Table 9. Criteria Used for Asset COF Evaluation
Category Criteria/Factor Description
Operating Ability Functionality of
Process Area
This criterion takes into account the functionality of the process area if an asset fails. Asset failure will have a varying degree of impact on the ability of the process area to operate depending on the role of the asset and the role and configuration of the process area. Asset failure may lead to reduced power efficiency, increased personnel hours, decreased ability to meet design criteria, or in certain cases, an inability of the process area to function at all.

Service Reliability
Repair/
Replacement
Difficulty
Reliability of service decreases as the time and/or resources required to repair or replace an asset increase. An easy repair or replacement is defined as taking one person no more than one day to complete the task. A difficult repair or replacement would take more than one person and/or more than one day to complete. If the repair or replacement requires the process area or plant to be taken offline, even for a short amount of time, the service impact is greater still. If the asset is obsolete, it is assumed that a partial redesign of the process area, and/or programming of the controls, would need to occur.

The COF factors shown in Table 9 are translated into numeric rankings of 1 to 5, with 5 indicating the highest or worst consequence. Each asset is evaluated for the two factors shown in Table 9, with a resultant overall COF score of between 2 and 10. The factors and their range of potential ratings for each category are presented in detail in Table 10.

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Table 10. Asset LOF Rating Factors
Category
Criteria/
Factor
Rating
1 2 3 4 5
Operating
Ability
Functionality of
Process Area
(if asset fails)
Operates
Normally
Lack of
Redundancy/
Potential Reduced
Efficiency
Reduced
Efficiency
Reduced
Capacity/
Pressure
Cannot
Operate
Service
Reliability
Repair/
Replacement
Difficulty
Easy Difficult – Offline Obsolete
Asset Risk Results
By plotting the LOF and the COF scores against each other, an overall risk level was assigned to each asset.

Risk levels are prioritized into five risk levels: Low, Medium-Low, Medium, Medium-High, and High, each of which is color-coded in Table 11. These risk levels were assigned to the various cells using best engineering judgment to determine which combinations warrant the highest levels of concern versus those that warrant lesser levels of concern.

Table 11 presents the total number of assets that fall into each LOF, COF, and risk level category. The asset risk assessment results are summarized in Table 12, which lists the total number and percentage of assets that fall in each risk level. As shown in Table 12, the majority of the NBRWTP assets (59 percent) fall into the Medium risk level. Detailed COF and LOF ratings for each NBRWTP asset are presented in Appendix C of this TM.

Table 11. NBR WTP Asset Risk Level Results
Number of
Assets
COF Score
2 3 4 5 6 7 8 9 10 Total
LOF Score
2 0 0 2 5 0 0 0 0 0 7
3 0 28 2 0 2 0 0 4 0 36
4 21 29 5 8 12 14 16 14 0 119
5 0 8 1 26 41 60 5 2 0 143
6 15 51 28 19 0 3 0 21 0 137
7 16 13 21 22 5 7 28 31 0 143
8 1 5 0 3 0 0 0 0 0 9
9 0 0 0 0 0 0 0 0 0 0
10 0 0 0 0 0 0 0 0 0 0
Total 53 134 59 83 60 84 49 72 0 594
Risk Levels Low Medium-Low Medium Medium-High High
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Table 12. Summary of NBRWTP Asset Risk Assessment Results Risk Level No. of Assets Percent of Total
Low 35 5.9
Medium-Low 90 15.2
Medium 350 58.9
Medium-High 88 14.8
High 31 5.2
Total 594 100
Process Area Risk Methods
The risk for each process was evaluated based on the COF of the process area, as well as the combined LOF scores of the assets within each process area, as described below.

Process Area LOF
The LOF for each process area was evaluated using the LOF scores of individual assets within each process area, which were then weighted by their respective monetary value. An asset value weight was assigned to each asset based on its nominal estimated monetary value, as shown in Table 13. This value weighting considers that assets of a higher value or importance (e.g., an ozone generator) will have a greater impact on overall process area LOF than assets of lower value or importance (e.g., a field instrument or sump pump).

Overall process area LOF scores were determined by first weighting the LOF scores of each individual asset using the weighting factors shown in Table 13. The resulting weighted LOF scores for each asset were then added together and divided by the sum of the weighting factors. This algorithm produces an overall LOF score between 2 and 10 for the given process area, in a manner similar to the LOF scoring for the individual assets.

Table 13. Asset Value Weight
Asset Nominal Monetary Value Asset Value Weight
<$25,000 0.3
$25,000-$250,000 0.7
>$250,000 1
Process Area COF
The COF of a given process area takes into account the impacts to the NBRWTP should a process area fail.

COF factors for each process area were derived in a manner similar to that of the COF factors for individual assets comprising that process, as presented in Table 10 above. Similar to the COF scoring for assets, process area COF is rated on a 2 to 10 scale.

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Process Area Risk Results
Figure 5 shows the percentage of assets in each process area that fall within each risk level prior to weighting (as represented by the colored bars). This presentation of asset risk distribution within each process area provides a comparison between process areas.

Figure 5. Risk Levels of Assets by Process Area, Percent of Total Table 14 presents LOF score, COF score, risk score, and risk level for each process area, ranked from highest to lowest risk. These results will provide the basis for prioritizing the capital improvements. 0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Percent of Total Number of Assets in Risk Level Per Process Area High Med-High Medium Med-Low Low
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Table 14. Summary of NBRWTP Process Area Risk Assessment Results Process Area
LOF Score
(value-weighted) COF Score
Risk Score
(weighted)
Risk Level
(Priority)
04 – Flash Mix 5.8 8 46.4 Med-High
07 – TWPS 6.2 7 43.4 Med-High
12 – Drying Beds / Pump Stations 6.2 7 43.4 Med-High
04 – Pretreatment 5.9 7 41.3 Med-High
05 – Filters 5.6 7 39.2 Med-High
09 – Blower Building 5.6 7 39.2 Med-High
02A – Raw Water – PSC 6.0 6 36.0 Medium
10 – Chemicals 5.1 7 35.7 Medium
11 – Washwater Recovery 5.1 7 35.7 Medium
02B – Raw Water – NBA 4.8 6 28.8 Medium
02C – Raw Water – Blending 4.0 7 28.0 Medium
08 – Ozone Gen / LOX 5.5 5 27.5 Medium
01 – Operations Building 4.5 6 27.0 Medium
15 – Spill Containment 6.7 4 26.8 Medium
03 – Pre–Ozone 4.9 5 24.5 Medium
14 – Maintenance Building 6.7 3 20.1 Med-Low
06 – Post–Ozone 6.3 3 18.9 Med-Low
00 – Miscellaneous Systems 5.2 3 15.6 Med-Low
13 – Warehouse Building 5.0 2 10.0 Low
(a) value weighting considers that assets of a higher value or importance will have a greater impact on overall process area LOF than assets of lower value or importance.

CAPACITY REHABILITATION RECOMMENDATIONS
In recognition of the NBRWTP current reliable treatment capacity of approximately 32 mgd, as described earlier in this TM, efforts are necessary to rehabilitate, replace, or expand existing facilities and processes, as appropriate, to bring the current maximum reliable treatment capacity of the NBRWTP back up to 40 mgd. This section describes recommended improvements to the filtration and washwater recovery systems, respectively, to achieve this goal.

Filtration
The filters at the NBRWTP (in conjunction with the washwater recovery process discussed below) present the most significant obstacle to the plant achieving production rates above approximately 32 mgd. With a current total of eight filters, each with a surface area of 700 square feet and a reliable loading rate of about 4.5 gallons per minute per square foot (gpm/ft2), the NBRWTP can only produce 32 mgd with one filter offline2. According to operations staff, headloss across the filters increases noticeably when they are loaded at rates greater than about 4.5 gpm/ft2, which tends to decrease filter 2 According to NBRWTP operations staff, filter loading rates up to 4.5 gpm/ft2 typically result in stable filter
operation and filter runtimes of approximately 60 hours.

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runtimes, increase filter backwashing frequency, and generally stress the washwater recovery system.

To produce 40 mgd with a single filter offline, the NBRWTP would need to sustain a filter loading rate of about 5.7 gpm/ft2.

One approach to improving the production capacity of the filtration process to ensure that 40 mgd can be reliably produced by the NBRWTP would be to construct two additional filters with the same surface area as the existing filters, for a total of ten filters. At a loading rate of 4.5 gpm/ft2 and single filter offline, such an expanded filtration system would produce up to 40.8 mgd while maintaining typical filter runtimes.

Although this approach would help achieve the necessary capacity rehabilitation, it would be costly.

It is possible, however, that a lower cost approach would yield similar benefits. A filtration optimization study, consisting of a focused evaluation of the existing filters and the ability of their supporting processes to handle more challenging water quality at higher filter loading rates, may result in the identification of lower-cost improvements than the construction of two new filters. Such an optimization study may include some combination of the following:
• Bench- and pilot-scale evaluation of pre-filter conditioning chemicals and doses to optimize the types, doses, and application locations for coagulants and filter aid polymers • Rapid small-scale column tests to assess filter performance in response to a variety of factors and potential modifications, including filter media types and configurations, filter loading rates, pre-treatment chemical selections and doses, and backwashing and/or filter-to-waste procedures
• Plant-scale testing of approaches deemed favorable during bench- and pilot-scale testing To maximize the potential for cost-effective filter operation at loading rates approaching 6 gpm/ft2, it is recommended that Fairfield conduct a filter optimization study prior to and potentially in lieu of electing to construct additional filters. Even if Fairfield ultimately determines that constructing one or more additional filters is the preferred approach to reliably treating up to 40 mgd, it is likely that the results of the filter optimization study will yield valuable insights into the design and construction of the new filters, and into the operation of the overall, expanded filtration facility. Even if the outcome of the optimization study is to change the type and/or configuration of filter media, a full-scale replacement of the media in all existing filters is likely to represent a fraction of the cost to construct one or more new filters.

Washwater Recovery
Although filter optimization efforts may provide measurable improvement in the ability of the NBRWTP to effectively filter settled water at rates exceeding 4.5 gpm/ft2, it remains likely that some decrease in filter runtimes would occur with higher loading rates, and that the frequency of filter backwashes would therefore increase. Accordingly, the plant should be adequately equipped to manage an increase in backwashing frequency without jeopardizing other plant operations.

It is recommended that the NBRWTP construct one additional washwater recovery basin equal in volume to the existing basin. Doing so would allow the NBRWTP to accommodate at least three filter backwash volumes without needing to pump the basins down. In practice, however, it is advisable to continuously pump the basins down at a steady rate.

Because the existing washwater recovery basin does not provide any significant turbidity reduction to stored washwater, returning equalized washwater directly to the head of the plant using such a system risks exceeding the DDW guidelines for recycle water turbidity limits under the Cryptosporidium Action Plan. To mitigate this risk, it is recommended that the NBRWTP construct washwater clarifiers to allow TM – City of Fairfield
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settling of equalized washwater before recycling to the head of the plant. As described in the next section of this TM, two clarifiers similar in form and function to the existing clarifiers at the Waterman WTP would be suitable for this purpose.

It should be noted that the washwater recovery process improvement recommendations described above are identical to the performance- and operations-based improvements described previously in the On-Site Condition Assessment section of this TM.

PLANT EXPANSION ALTERNATIVES
Key elements of the expansion of water treatment capacity described in this section include:
• Fairfield Demand Projections
• Advantages of NBRWTP Expansion
• Expansion Scenarios
• NBRWTP Facility Additions and Modifications to Accommodate 2050 Demands • Potential Treatment Process Modifications
Fairfield Demand Projections
The existing and projected long-term (2050) water demands for Fairfield, as taken from Chapter 3 of the Master Plan Report, are summarized in Table 15 in units of millions of gallons (MG) annually and mgd. As indicated in the table, Fairfield is expected to require 55 mgd of treatment capacity to meet 2050 demands.

Considerations for possible expansion of the NBRWTP must account for these projections, as well as any additional capacity needed by Vacaville through the 1987 Joint Exercise of Powers Agreement (JPA), including how such demands will be distributed between the NBRWTP and its companion facility, the Waterman Water Treatment Plant (Waterman WTP). A separate assessment of the Waterman WTP is addressed in a TM titled “Waterman WTP Condition Assessment, Performance Evaluation, and Expansion Analysis”.

Table 15. Summary of Existing and Future Water Demands, City of Fairfield Planning Period
Total Annual
Production, MG(a)
Average Day
Production, mgd(a)
Maximum Day
Production, mgd(b)
Average (2020-2022) 6,990 19 36
Long-Term (2050) 10,578 29 55
(a) Taken from Tables 3-5, 3-7, and 3-14 from the Master Plan Report. (b) Based on a recommended maximum day demand peaking factor of 1.9, per Chapter 3 of the Master Plan Report.

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Advantages of NBRWTP Expansion
The need to consider capacity expansion at the NBRWTP must be coordinated with any expansion plans for the Waterman WTP. Moreover, in assessing such capacity needs, consideration must be given to the needs of both Fairfield and Vacaville. For various reasons, existing factors favor concentrating capacity expansion at the NBRWTP rather than at the Waterman WTP. These factors include the following:

1. Relative to the NBRWTP, the Waterman WTP is space-constrained, which restricts and/or complicates any potential expansion of facilities there.

2. Plans for significant future development exist in the vicinity of the NBRWTP, such that expansion of the NBRWTP facilitates service to those areas.

3. The NBRWTP is closer to both Vacaville and Travis Air Force Base (a potential future customer) than is the Waterman WTP, thereby facilitating service to both areas.

4. NBRWTP treats water from two water sources (NBA and PSC), whereas Waterman WTP only treats water from PSC.

5. Fairfield is interested in improving its ability to treat NBA source water. Given the possible need for treatment process improvements to achieve this objective, coupling such improvements with expansion of facilities may be simpler and more cost-effective than improving treatment at NBRWTP while also expanding facilities at the Waterman WTP.

For these reasons, it is assumed in this analysis that any expansion of water treatment facilities serving Fairfield (and Vacaville) will occur at the NBRWTP.

Expansion Scenarios
As noted above, the City of Vacaville is entitled to 13.3 mgd, or 33 percent of the NBRWTP existing nominal capacity of 40 mgd. In addition, Vacaville has expressed a potential interest in additional future water to meet a 2050 demand condition of up to 38.3 mgd. In addition, all NBRWTP expansion scenarios must address Fairfield’s demand requirements specified in Table 15 above. Accordingly, for this analysis, the following scenarios for allowances for Vacaville are considered:
• Scenario 1: Fairfield 2050 demands plus 13.3 mgd for Vacaville • Scenario 2: Fairfield 2050 demands plus 24.5 mgd3for Vacaville • Scenario 3: Fairfield 2050 demands plus 38.3 mgd for Vacaville As discussed above, Fairfield has adopted a policy whereby “firm capacity” is defined as equaling 90 percent of the maximum reliable treatment capacity of the overall facility, and that this multiplier is to be applied only to the larger of Fairfield’s two water treatment facilities (the NBRWTP). For purposes of this TM, the terms “available capacity” and “total capacity” are used instead of firm capacity and maximum treatment capacity, respectively.

In applying this policy, it is assumed that the Vacaville demands listed above equate to available capacity rather than total capacity. Similarly, the projected Fairfield maximum day 2050 demand of 55 mgd shown in Table 1 above is also assumed to equate to available capacity rather than total capacity. Finally, because the 90 percent multiplier only applies to the NBRWTP, and because it is assumed that Waterman WTP 3 24.5 mgd was selected as the midway point between 13.3 and 38.3 mgd, and is understood as a likely target 2050 capacity for Vacaville.

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facilities will be rehabilitated to reliably achieve 30 mgd of capacity, the 2050 available capacity needs of Fairfield at the NBRWTP are projected to be 25 mgd (55 mgd minus 30 mgd). Accordingly, the various NBRWTP capacity requirements associated with Scenarios 1 through 3 are summarized in Table 16.

Table 16. NBRWTP 2050 Capacity Scenarios
Scenario
Available Capacity, mgd Total Capacity, mgd
Fairfield(a) Vacaville NBRWTP Fairfield(a) Vacaville NBRWTP 1 25.0 13.3 38.3 27.8 14.8 42.6
2 25.0 24.5 49.5 27.8 27.2 55.0
3 25.0 38.3 63.3 27.8 42.6 70.4
(a) Excludes an additional 30 mgd of demand met by the Waterman WTP.

For the purposes of this analysis, it is assumed that any expansion of the NBRWTP will result in total capacities that are in increments of no less than 5 mgd. Accordingly, the NBRWTP 2050 capacity scenarios of interest in this TM are as follows:
• Scenario 1: Total NBRWTP 2050 capacity = 45 mgd
• Scenario 2: Total NBRWTP 2050 capacity = 55 mgd
• Scenario 3: Total NBRWTP 2050 capacity = 70 mgd
NBRWTP Facility Additions and Modifications to Accommodate 2050 Demands To achieve either of the NBRWTP expansion scenarios defined above, a variety of treatment facility additions and modifications would be required. Based on reviews of existing facility design criteria, as well as application of typical design criteria for new or modified processes, conceptual-level requirements for each of the major facilities and process areas are summarized below. Conceptual-level hydraulic improvements associated with the expansion scenarios are discussed later in this TM.

Figures 6 through 8 provide conceptual depictions of the footprint and potential location of the new or modified facilities under the 45, 55 and 70 mgd expansion scenarios.

Raw Water Diversion
To manage head losses and increase the reliability of screening of raw water from the PSC, a second mechanical screening system would be recommended for PSC water under the 55 and 70 mgd scenarios.

The original canal intake structure was designed to accommodate a second screening system, and such a system could be installed with minimal interruption to the existing facility.

Pre-Ozonation
If the NBRWTP continues to use pre-ozonation (as opposed to intermediate ozonation, discussed in more detail below), a total of one, two and three new pre-ozone contactors will be required to maintain the target hydraulic detention time of five minutes per contactor under the 45, 55, and 70 mgd scenarios, respectively. Space for additional contactors is available directly to the east of the existing contactors, as shown on Figures 6 through 8.

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In addition to new contactors, at least one additional ozone generator would be required for the 70 mgd scenario, depending on the target ozone concentrations for various ozone demand conditions. There is adequate space for up to two new generators inside the existing ozone generation building. For the 45 and 55 mgd scenarios, the two existing generators would be sufficient for all but the maximum anticipated ozone demand conditions (i.e., 4.0 mg/L), in which case a third generator would be required.

Lastly, one or more additional ozone destruct systems would be required to treat ozone-rich gas from the headspace of the additional contactors. Additional destruct systems could be located under an extension of the canopy structure along the north end of the existing contactors.

Pretreatment
The existing pretreatment system, which consists of flash mixing (for the injection and dispersion of the primary coagulant and other chemicals), flocculation basins, and sedimentation basins, includes a single flash mixing system and three flocculation/sedimentation trains. Assuming the underlying pretreatment process does not change, the number of additional pretreatment trains necessary to reach NBRWTP capacities of 45, 55, or 70 mgd depends on the target flocculation time (for the flocculation basins) and the surface loading rate (for the sedimentation basins), as shown in Table 17.

Table 17. Comparison of Selected Pretreatment Train Design Criteria for Expansion Scenarios Parameter Value
Flow Rate, mgd 40 45 55 70
No. Pretreatment Trains, total 3 3 4 5 4 5 6 6 7 8
Flocculation Time, min 20.2 18.0 23.9 29.9 19.6 24.5 29.4 23.1 26.9 30.8 Surface Loading Rate, gpm/ft2 1.05 1.18 0.89 0.71 1.09 0.87 0.72 0.92 0.79 0.69 To maintain similar or better treatment performance as the existing facilities at their existing rated capacity of 40 mgd, a total of one, two, and three new pretreatment trains (with an accompanying flash mixing train) would be required at capacities of 45, 55, and 70 mgd, respectively. As shown in Figures 6 through 8, space for additional pretreatment trains is available to the west of the existing trains. Additional considerations surrounding flocculation time and sedimentation basin surface loading rates are described later in this TM.

In addition to increasing the number of pretreatment basins, the capacity of the existing sedimentation sludge pumping system would need to be increased to handle the increased sludge generation.

Filtration
The existing filtration system consists of eight filters that were originally designed for a filtration rate of up to 6.0 gallons per minute (gpm) per square foot (ft2). Although the NBRWTP has historically had difficulty maintaining its desired filter runtime of 60 hours when the filtration rate exceeds approximately

5.0 gpm/ft2, it is standard practice to design new granular media filters to operate reliably at filtration rates between 5 and 6 gpm/ft2. Accordingly, it is recommended that Fairfield plan for the construction of additional filters designed for filtration rates of up to 6.0 gpm/ft2 with at least one filter offline. It should be noted that some of the NBRWTP’s historical difficulties related to filtration rates and runtimes are a function of the existing washwater recovery system. Expansion and modification of the washwater recovery system, which would be required as part of either NBRWTP expansion scenario, are expected to help facilitate operation of the filters at or near 6.0 gpm/ft2.

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With the above considerations in mind, a minimum of one, three, and five new filters would be required at capacities of 45, 55, and 70 mgd, respectively, with a single filter offline. If Fairfield staff wish to allow for two filters offline at any time, two, four, and six new filters would be required, respectively. A comparison of plant capacity, the number of online filters, and the filtration rate for the expansion scenarios is shown in Table 18.

Table 18. Comparison of Selected Filter Design Criteria for Expansion Scenarios Parameter Value
Flow Rate, mgd 40 45 55 70
No. Filters, total 8 9 10 11 11 12 13 13 14 15
Filtration Rate with 1
Filter Offline, gpm/ft2

5.67 5.58 4.96 4.46 5.46 4.96 4.55 5.79 5.34 4.96
Filtration Rate with 2
Filters Offline, gpm/ft2

6.67(a) 6.38(a) 5.58 4.96 6.06(a) 5.46 4.96 6.31(a) 5.79 5.34 (a) Exceeds regulatory maximum, unless a higher loading rate has been approved by DDW.

As shown in Figures 6 through 8, space for additional filters is generally available to the south of the existing filters.

Chlorine Contact
The NBRWTP currently utilizes a single chlorine contact basin (CCB) located upstream of the TWPS. Sodium hypochlorite is injected upstream of the CCB at the downstream end of the post-ozone contactors.

Additional volume available for achieving required CT ratios includes the TWPS wet well, as well as TWPS discharge piping between the plant and the first customer. Although the NBRWTP monthly CT calculations are based on the assumption that the existing post-ozone contractor volumes contribute to CT, it is West Yost’s understanding that sodium hypochlorite is injected downstream of the contactors, such that the CT calculations should not include this additional volume.

In Table 19 below, predicted CT ratios are calculated using conservative assumptions based on operating data from 2018 to 2022, including a minimum chlorine residual, a maximum pH, and a minimum water temperature, all of which tend to drive the observed or predicted CT ratio down. Accordingly, the recommended target CT ratio for the NBRWTP expansion scenarios is 1.0. Assuming facilities are expanded to satisfy the criteria in Table 19, the observed CT ratio under nearly all other conditions (e.g., lower production rates, higher chlorine residuals, lower pH values, and higher temperatures) will be substantially higher. As demonstrated in Table 19, additional chlorine contact volume will be required in any of expansion scenarios considered: approximately 100,000 gallons at 45 mgd, 200,000 gallons at 55 mgd, and 1,100,000 gallons at 70 mgd.

Actual sizing of a future CCB will be impacted by whether or not Fairfield chooses to relocate its sodium hypochlorite injection location to the upstream end of the original post-ozone contactors, thereby benefiting from the additional contact time that this unit would provide. Regardless, based on Fairfield’s stated intention to avoid post-ozonation in the future, it is assumed that a new CCB could be constructed north of the existing post-ozone contactors (in the area originally set aside for the construction of additional post-ozone contactors). It is possible that the new CCB could incorporate a portion of the existing post-ozone contactor’s overall volume, resulting in a process that consists of two parallel CCBs that entirely eliminates the post-ozone contactors in their original form and function.

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Table 19. Chlorine Contact Volume and Disinfection Achieved Parameter 40 mgd 45 mgd 55 mgd 70 mgd
CT in Existing CCB, T10/HDT = 0.7(a), Chlorine Residual = 1.09 mg/L(b) Volume, gallons(c) 1,475,782
T10, minutes 53.1 47.2 38.6 30.4
CT, mg/L-min 40.5 36.0 29.5 23.2
CT in New CCB, T10/HDT = 0.7(a), Chlorine Residual = 1.09 mg/L(b) Volume, gallons 0 100,000 200,000 1,100,000
T10, minutes 0.0 2.2 3.7 15.8
CT, mg/L-min 0.0 2.4 4.0 17.3
CT in Treated Water Pump Station, T10/HDT = 0.7(a), Chlorine Residual = 1.09 mg/L(b) Volume, gallons 56,000
T10, minutes 1.5 1.3 1.0 0.8
CT, mg/L-min 2.2 1.4 1.1 0.9
CT between CCB and Treated Water Pump Station, T10/HDT = 1.0(a), Chlorine Residual = 1.09 mg/L(b) Volume, gallons 41,180
T10, minutes 1.5 1.3 1.1 0.9
CT, mg/L-min 1.6 1.4 1.2 0.9
CT Achieved through all Contactor Segments
Total CT Achieved, mg/L-min 43.6 41.3 35.8 42.2
CT Required, mg/L-min(d) 41.2 41.2 41.2 41.2
CT Achieved/CT Required 1.06 1.00 1.01 1.03
(a) T10/HDT equivalent to the T10/HDT of the contactor segments indicated in the City's CT compliance calculations. (b) Minimum chlorine residual value for the period 2018-2022. (c) Volumes equivalent to the volumes of the contactor segments indicated in the City's CT compliance calculations. (d) CT Required calculated assuming maximum pH of 8.5, minimum temperature of 6.9°C, minimum chlorine residual of 1.09 mg/L, and

0.5 log Giardia inactivation.

N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\N Bay Reg WTP Overall Site 45 MGD.dwg 5/24/2024 1:21 PMasmith N Approximate Footprint of New Facility Required for Expansion to 45 MGD LEGEND City of Fairfield North Bay Regional WTP Site Plan 45 MGD Figure 6 Water Master Plan N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\N Bay Reg WTP Overall Site 55 MGD.dwg 5/24/2024 4:44 PMrwalker N Approximate Footprint of New Facility Required for Expansion to 55 MGD LEGEND City of Fairfield North Bay Regional WTP Site Plan 55 MGD Figure 7 Water Master Plan N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\N Bay Reg WTP Overall Site 70 MGD.dwg 5/24/2024 4:42 PMrwalker N Approximate Footprint of New Facility Required for Expansion to 70 MGD LEGEND City of Fairfield North Bay Regional WTP Site Plan 70 MGD Figure 8 Water Master Plan TM – City of Fairfield
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Treated Water Pumping
The existing TWPS includes a total of 11 pumps of various sizes and functions, including five treated water pumps for Fairfield, four treated water pumps for Vacaville, and two backwash supply pumps for the filtration process. Under the two NBRWTP expansion scenarios defined above, existing pumps would either need to be replaced with larger pumps capable of conveying the additional treated water to Fairfield and Vacaville, or supplemented with additional pumps of similar size. Given the existing constraints around the TWPS, replacing existing pumps with larger pumps is likely to be preferable to enlarging the existing TWPS wet well to accommodate a larger number of pumps; an evaluation of the existing wet well’s ability to meet Hydraulic Institute standards with larger pumps installed would be required to substantiate this possibility. Depending on the anticipated minimum flows to either City, one or more smaller jockey pumps may be required.

Given the large motor horsepower associated with the treated water pumps, the existing electrical system serving the TWPS would require significant expansion to accommodate larger pumps. Such an expansion would include not only the individual motor controls, but also the electrical building that houses the existing MCCs, as the existing building is already relatively crowded and unlikely to be capable of accommodating larger MCCs.

Washwater Equalization
The existing washwater equalization basin can accommodate up to 360,000 gallons of washwater, equivalent to approximately 1.7 backwash volumes. At a production rate of 40 mgd, and assuming seven filters online and 40-hour filter runtimes, the existing basin would need to be able to accommodate up to five backwashes per day. Assuming that NBRWTP operations staff prefer to schedule backwashes to occur within a typical 12-hour period in which the plant has a full complement of staff, the required basin discharge rate under the above conditions would be approximately 1,750 gpm.

In any of the NBRWTP expansion scenarios considered, the number of filters, and thus the number of backwashes per day, will increase. Using the same assumptions noted above (namely, a conservative filter runtime of 40 hours, and only one filter offline at any time), at least one new washwater equalization basin would be required for any of the expansion scenarios. The exact number and overall volume of equalization basins is subject to operational preferences, but two total basins are recommended at a minimum. This configuration would allow at least three consecutive backwashes to be completed without needing to pump the basins down. Conceptual equalization volume requirements as a function of filter quantity and runtime are summarized in Table 20.

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Table 20. Summary of Conceptual Washwater Equalization Volume Requirements Parameter Value
Flow Rate, mgd 40 45 55 70
Backwash Volume, gal, ea 175,000
Filter-to-Waste Volume, gal, ea 42,000
No. of Online of Filters 7 9 11 13
Maximum BWs per Day(a) 4.2 5.4 6.6 7.8
Backwash Volume, gal/day 735,000 945,000 1,155,000 1,365,000 Filter-to-Waste Volume, gal/day 176,400 226,800 277,200 327,600 Total Washwater Volume, gal/day 911,400 1,171,800 1,432,200 1,692,600 Number of EQ Basins 1 2 2 2
EQ Basin Volume, gal, total 360,000 720,000
Total BW Capacity, ea 1.66 3.32
EQ Basin Turnovers Required per Day, ea 3.01 1.81 2.11 2.41 (a) Based on filter runtimes of 40 hours.

It should be noted that because new washwater clarifiers are recommended as part of either expansion scenario (see below), the evaluation of washwater volume need not account for settling time between backwashes, as all equalized basin contents would be conveyed to the new clarifiers for liquid-solid separation. To accommodate the increased washwater flows, and depending on the period of time each day that NBRWTP staff are likely to restrict backwashing of filters to, the existing washwater recovery pumps may also require replacement with larger pumps.

Washwater Clarification
To improve the NBRWTP ability to meetthe recycled water turbidity guidance in the Cryptosporidium Action Plan (<2.0 NTU), a washwater clarification process is recommended downstream of the washwater equalization basins. Clarified supernatant from the clarifiers would be pumped to the head of the plant for treatment, while thickened solids collected from the clarifiers would be pumped to the sludge lagoons.

Although several approaches to clarifying washwater are available, clarifiers similar in design to those currently in use at the Waterman WTP are recommended, as NBRWTP staff are familiar with their operation and Waterman WTP staff are generally satisfied with their performance, including their ability to achieve reliable compliance with the Cryptosporidium Action Plan. Conceptual design criteria for this style of clarifier are summarized in Table 21.

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Table 21. Summary of Conceptual Washwater Clarifier Design Criteria Parameter Value
NBRWTP Flow Rate, mgd 45 55 70
Washwater Flow Rate, gal/day 1,171,800 1,432,200 1,692,600 No. Clarifiers 2 3 3
Diameter, ft 43
Side Water Depth, ft 17
Volume, each, gal 184,662
Surface Area, each, ft2 1,452
Perimeter, each, ft 135
Overflow Rate(a), gpm/ft2 0.75 0.6 0.71
Weir Loading Rate(a), gpm/ft 8.0 6.5 7.6
(a) Assumes that flow from the washwater equalization basins is received for 12 hours per day.

To accompany the new clarifiers, a thickened sludge pump station would be required to convey solids to the sludge lagoons.

Solids Handling
To accommodate any of the NBRWTP expansion scenarios considered, additional sludge lagoons are recommended. Although the sizing, quantity, and operation of future lagoons will be affected by a number of operational variables and preferences (e.g., average annual demand, average annual coagulant dose, desired fill cycle duration, desired overall solids loading per unit surface area, desired drying time between fill cycles, etc.), the anticipated requirement is for a minimum of two additional lagoons of similar size to the existing bedsfor the 70 mgd scenario. Table 22 summarizes conceptual design criteria for the lagoons, based on an assumed average overall solids loading for the existing lagoons of approximately 7.7 lbs/ft2, and an objective of having at least one lagoon in reserve at all times. These criteria should be revisited and refined during preliminary design of any future NBRWTP expansion.

Table 22. Summary of Conceptual Sludge Lagoon Design Criteria Parameter Value
NBRWTP Capacity, mgd 40 45 55 70
Estimated Average Annual Demand, mgd 21 24 29 37
No. Lagoons 4 5 6 6
Lagoon Surface Area, ft2, ea 99,000
Conceptual Solids Loading
ppd/mgd (annual average) 200
ppd 4,211 4,737 5,789 7,368
Fill Cycle Per Lagoon, days 180 160 130 100
Solids Per Fill Cycle
Lbs 735,000 – 758,00
lbs/ft2 7.4 - 7.7
No. Lagoons Filled Per Year 2.0 2.3 2.8 3.7
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As shown in Figure 6, there is adequate space to the south of existing Lagoon No. 4 for the construction of at least two new lagoons of similar size and shape to the existing lagoons. Fairfield staff have indicated that a certain amount of space east of the existing PSC must be reserved for future construction of a “buffering” basin to facilitate potential changes in DWR’s operation of the North Bay Aqueduct. Future lagoons would need to be designed and constructed with this space in mind.

To facilitate the operation of additional lagoons, modifications would be required at both the existing sludge pump station (which pumps unthickened sludge from the pretreatment process to the lagoons) and the existing decant pump station (which pumps supernatant from the lagoons to the washwater recovery basins. In each case, the pump station capacity would need to be increased.

Chemical Storage and Metering
Increases in annual NBRWTP production will result in increased consumption of chemicals. To accommodate the increased consumption rates, additional bulk chemical storage capacity will be required in certain cases. Table 23 summarizes the storage capacity and associated storage days for each of the regularly applied chemicals at the NBRWTP, assuming historical annual average doses at estimated annual average NBRWTP production rates. At a production capacity of 70 mgd, the total storage capacities for aluminum sulfate and sodium hypochlorite will need to be increased to maintain a storage capacity of at least 30 days. For all other chemicals listed, existing storage volume appears adequate.

For each of the regularly applied chemicals, the associated chemical metering pumps will need to be capable of handling the increased pumping rates. Because chemical metering pumps typically have large turndown ratios, the determination of whether and when to replace existing pumps with larger pumps will be specific to each application.

With respect to expansion of the pretreatment process (which, as discussed above, will include the construction of at least one new flash mixing train), it is recommended to install one new chemical metering pump for each of the chemicals applied at the flash mixing step, such that each flash mixing system will have a dedicated set of metering pumps.

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Table 23. Summary of Bulk Chemical Storage Volumes and Durations Chemical
Nominal
Storage Tank
Capacity, gal
40 mgd 45 mgd 55 mgd 70 mgd
Storage
Tank Qty
Storage
Duration,
days
Storage
Tank
Quantity
Storage
Duration,
days
Storage
Tank
Quantity
Storage
Duration,
days
Storage
Tank
Quantity
Storage
Duration,
days
Sodium Hypochlorite(a) 15,000 2 43 2 38 2 31 3 37
Liquid Alum 27,500 2 42 2 38 2 31 3 36
Cationic Polymer 6,800 1 195 1 173 1 142 1 111
Caustic Soda 17,400 2 90 2 80 2 66 2 52
Hydrofluosilicic Acid 6,800 1 123 1 109 1 90 1 70
LOX (Combined Storage Volume) 37,500 2 188 2 167 2 137 2 107 (a) Assumes 6.25% concentration of stored chemical following dilution of bulk deliveries.

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Potential Treatment Process Modifications
While the above descriptions are generally based on the continuation of the existing treatment approaches, there are a variety of potential process modifications that may be considered by Fairfield during preliminary design of an expansion to the NBRWTP. The following process modifications are discussed in further detail below:
• High-Rate Settling
• Intermediate Ozonation
• Pipeline Contactors
• Filter System Modifications
• Disinfection Credit via Ozonation
The possibility of implementing mechanical dewatering of solids was not considered in this section because operations staff prefer the existing sludge lagoon approach and because adequate space exists to construct additional lagoons (as discussed above).

High-Rate Settling
Although the conventional sedimentation basin approach used at the NBRWTP provides a reliable method for solids separation (or settling), it requires a relatively large footprint. The primary driver behind the footprint requirements of this approach is the hydraulic detention time, which is selected to allow flocs leaving the coagulation process adequate time to settle onto the basin floor before reaching the downstream end of the basin.

Reduced settling time may be possible within the NBRWTP sedimentation basins; and therefore, a higher flow rate within the same footprint, if inclined plates or tube settlers are installed. However, plates and tube settlers can be susceptible to algae growth (due to increased sunlight penetration near the surface of basin) and reduced smoothness of the plates (due to gradual accumulation and hardening of polymer, algae and other material present in the basins), which may reduce sedimentation effectiveness and settled water quality over time. Algal growth could be inhibited through construction of canopies to block sunlight (similar to the canopy over Waterman’s Actiflo process).

Another consideration is that high-rate settling requires an adequate coagulation and flocculation process upstream to be effective. Currently, the NBRWTP flocculation basins provide 21 minutes of retention time at a flow of 40 mgd, which is lower than the typical recommended target of 30 minutes. As a result, expansion or modification of the existing coagulation facilities would likely be required to make high-rate settling a worthwhile investment.

Intermediate Ozonation
Ozone demand is influenced by the presence and concentration of certain constituents in the water.

Accordingly, ozone demand will generally be higher in raw water that has not undergone coagulation, flocculation, and sedimentation, which typically removes a significant portion of dissolved and colloidal organic contaminants that exert an ozone demand. Given that the existing pre-ozonation process would require significant expansion to facilitate the NBRWTP expansion scenarios, Fairfield may wish to evaluate switching to intermediate ozonation, which places ozonation between the pretreatment and filtration processes. Such a modification may result in a lower average applied ozone dose than with the current pre-ozonation arrangement, as well as opportunities for construction cost savings.

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Pipeline Contactors
Pipeline contactors may be considered as an alternative to traditional reinforced concrete over-under or serpentine contact basins, for both the ozone and chlorine contact processes. Potential advantages of pipeline contactors may include reduced construction cost, reduced construction complexity, and high baffle factors (e.g., close to 1.0, representing perfect plug flow conditions).

Filter Operation Modifications
In general, NBRWTP operators prefer to schedule backwashes in advance based on filter runtimes instead of allowing backwashes to occur when terminal headloss is reached or when turbidity breakthrough occurs. According to feedback provided by operations staff, this preference is primarily a function of 1) managing the timing and volume of backwash waste sent to the washwater recycling facilities, and 2) limiting the use of the large horsepower backwash supply pumps during periods with peak time-of-use electrical rates. With improved washwater handling facilities (as described above), allowing shorter filter runtimes and/or triggering backwashes on terminal headloss or turbidity breakthrough is expected to become more manageable. As part of the preliminary design of a future NBRWTP expansion, Fairfield should consider these and other adjustments to facilitate filter loading rates closer to 6 gpm/ft2. Fairfield may also consider conducting bench or pilot-scale filter column testing to better gauge filter performance when operated at loading rates closer to 6 gpm/ft2.

Disinfection Credit via Ozonation
The NBRWTP currently uses ozone primarily to help control disinfection byproduct formation and to manage tastes and odor issues. It may be possible for the NBRWTP to receive disinfection credit for its current ozonation practices. Receiving disinfection credit from ozone contactors would require additional monitoring and control of ozone residuals throughout the contactors.

Whether or not credit from ozonation results in reduced CT requirements for free chlorine disinfection would depend on Fairfield’s preferences for having redundant disinfection capabilities in the event that the ozone process is offline. Accordingly, evaluating the practicality and cost-effectiveness of using post-ozonation (in addition to pre and/or intermediate ozonation) in lieu constructing additional chlorine contactors should be considered.

HYDRAULIC CAPACITY EVALUATION
The hydraulic capacity of the NBRWTP is affected by the sizes of pipelines, flumes, weirs, and other hydraulic structures. As flows increase, the head losses through each unit process also increase, resulting in higher water surface levels. Maximum allowable flows are those that can be safely contained (i.e., that do not create overflows or unacceptable operating conditions). Development of a hydraulic model and accompanying hydraulic profile schematics facilitates the identification of the acceptable hydraulic capacity of individual unit processes and the NBRWTP as a whole.

The hydraulic capacity evaluation presented in this TM includes the following elements:
• Hydraulic Profile Development
• Hydraulic Capacity Evaluation Results
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Hydraulic Profile Development
A spreadsheet hydraulic model was developed for the NBRWTP. The hydraulic model follows a downstream-to-upstream convention. The boundary condition (i.e., water surface elevation) at the TWPS is the starting point for the model. Head losses from sequential upstream processes are added to the downstream boundary conditions to develop the hydraulic profile.

Inputs for the hydraulic profile are based on available data and various assumptions. Record drawings from construction projects in 1988 (original construction) and 2011 (plant improvements) are used as the basis for the types, dimensions and elevations of pipelines, fittings, channels, weirs, flumes, and other related hydraulic features of the NBRWTP. In addition, typical hydraulic performance data from similar facilities or equipment manufacturers are used where hydraulic calculations cannot be readily applied to determine head losses (e.g., losses across granular filter media and underdrains, bar screens, etc.).

Estimates of typical hydraulic parameters for pipelines, fittings, and structures (i.e., friction and minor loss coefficients) have been made based on standard industry practices.

The assumed numbers of units in service, as well as the recycle flow assumptions, for each of the scenarios developed in the hydraulic model are presented in Table 24. For recycle flow rates, the hydraulic calculations are based on maximum instantaneous rates. For processes in which more than one unit currently exists, the hydraulic calculations are based on the unit with the greatest head losses resulting from its configuration or location.

Table 24. Summary of Modeled Hydraulic Profile Scenarios Scenario
NBA
Raw
Water
Flow,
mgd
PSC Raw
Water
Flow,
mgd
Total
Raw
Water
Flow,
mgd
Return
Flow,
mgd
Pre-Ozone
Contactors
Pretreatment
Trains
Online
Filters
Filtration
Rate,
gpm/ft2
Post-Ozone
Contactors
Chlorine
Contact
Basins
1 15 15 30 3 2 3 7 4.3 2 1
2 20 20 40 4 2 3 7 5.7 2 1
3 22.5 22.5 45 4.5 3 4 8 5.6 2 1
4 27.5 27.5 55 5.5 4 5 10 5.5 2 1
5 35 35 70 7 5 6 12 5.8 2 2
Hydraulic Capacity Evaluation Results
The hydraulic profile for the existing NBRWTP is shown on Figure 9 for a flow of 30 mgd, which provides a useful starting point for the analysis of future expansion needs. The 30 mgd scenario reflectsthe original design capacity of the NBRWTP (prior to the facility being re-rated for 40 mgd based on the decision to construct two additional filters as a change order during the original construction project).

In general, modeled results for the 30 mgd scenario agree well with the hydraulic profile included in the NBRWTP’s original record drawings. Notable exceptions to this observation are as follows:
• Modeled results predict that the post-ozone contactor outlet weirs will be submerged by approximately 6 inches. It is unclear how the original hydraulic profile arrived at the listed water surface elevation downstream of the outlet weirs. The head loss along the run of pipe between the chlorine contact basin and the post-ozone contactors is significantly affected TM – City of Fairfield
May 24, 2024

N-268-60-22-20-WP-TM3
by the 72-inch by 54-inch tee just downstream of the post-ozone contactors, and it is possible that this fitting was modeled as a 90-degree bend in the original model, resulting a lower fitting head loss. In any event, the discrepancy is not enough to significantly impact the resulting upstream water surface elevations within the post-ozone contactors. • Modeled results predict that the filter inlet weirs will be submerged by about 0.4 inches.

This discrepancy is believed to be the result of a mismatch between the stated weir elevation in the original hydraulic profile (95.05 ft) and the listed top-of-concrete elevation for the weir in the original structural drawings (94.75 ft). If the 95.05 ft elevation were used in the model, no submergence would occur at 30 mgd.
• Modeled results at the PSC valve vault, which are based on the use of the 54- and 72-inch raw water pipeline, indicate a hydraulic grade elevation approximately 6.5 ft lower than the original hydraulic profile. This discrepancy is likely due to some combination of the following: the original profile may have assumed that all or much of the raw water was conveyed through the parallel 30-inch raw water pipeline; or, the original profile may have assumed that the flow control valve(s) were partially closed.

With respect to an NBRWTP expansion to up to 70 mgd, a variety of new large-diameter pipes will be required to convey flows from one process area to the next, as shown below. In general, few yard piping modifications would be required for an NBRWTP expansion to 45 mgd, and only a subset of the modifications suggested for the 70 mgd scenario would be applicable to the 55 mgd scenario. • Between the new chlorine contact basin and the existing TWPS (approximately 200 ft of 72-inch diameter piping)
• Between the existing post-ozone contactors and the new chlorine contact basin (approximately 100 ft of 72-inch diameter piping)
• Between the new filters and the existing post-ozone contactors and/or new chlorine contact basin (approximately 200 ft of 72-inch diameter piping) • Between the new pretreatment trains and the filtration process area (approximately 600 ft of 72-inch diameter piping)
• Between the new pre-ozone contactors and the new pretreatment trains (approximately 200 ft of 72-inch diameter piping)
• Between the pre-ozone process area and the raw water blending vault (approximately 100 ft of 72-inch diameter piping)
• Depending on the maximum PSC and NBA flows under a 70 mgd NBRWTP scenario, and any corresponding changes to the metering and valve vaults associated with those raw water sources, larger and/or parallel raw water pipelines may also be required between the raw water blending vault and the relevant raw water intake
Detailed modeling of these pipelines is beyond the scope of the analysis presented in this TM and will instead need to be completed as part of preliminary design efforts for the expanded NBRWTP. 70 110 100908090 100 110 120 70 110 100 9080 8090100 110 120 7060 EL. 116.0 (MAX) EL. 103.5 (MIN) EL. 102.87 OVERFLOW WEIR EL. 102.5 EL. 100.1 EL. 105.0 EL. 99.9 WEIR EL 99.2 EL. 97.7 OVERFLOW WEIR EL. 97.8 EL. 97.0 EL. 99.5 EL. 96.9 WEIR EL. 96.6 EL. 95.4 EL. 114.5 EL. 107.8 EL. 107.4EL. 100.8 110.0 (MAX) 108.0 (MIN) EL. 95.1 WEIR EL. 94.8 TOP OF TROUGH EL. 91.8 EL. 94.7 EL. 100.3 EL. 80.9 OVERFLOW WEIR EL. 90.75 EL. 80.3 EL. 93.8 EL. 80.1 WEIR EL. 79.3 EL. 79.8 EL. 81.50 EL. 79.1 EL. 79.0 EL. 92.00 NORTH BAY AQUEDUCT TURNOUT AND METER AND VALVE VAULT PARALLEL FLOW CONTROL PUTAH SOUTH CANAL INTAKE STRUCTURE PUTAH SOUTH CANAL METER AND VALVE VAULTS PARALLEL FLOW CONTROL TO WASHWATER RECOVERY FROM SEDIMENTATION BASINS TO FILTER BACKWASH TO FAIRFIELD FROM BACKWASH PUMPS FILTERS POST-OZONATION BASIN CHLORINE CONTACT BASIN TREATED WATER PUMP STATION PRE-OZONATION BASIN FLASH MIX FLOCCULATION/SEDIMENTATION BASIN SLUDGE TO DRYING BEDS TO FILTERS TOP OF MEDIA EL. 87.2 TO VACAVILLE RAW WATER BLENDING VAULT EL. 100.3 EL. 96.9 WATER SURFACE ELEVATIONS UPSTREAM OF RAW WATER BLENDING VAULT PER ORIGINAL (1988) RECORD DRAWINGS N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\26860-2220-Hydraulic Profile.dwg 9/28/2023 2:23 PMasmith City of Fairfield North Bay Regional WTP Schematic Hydraulic Profile at 30 MGD Figure 9 Water Master Plan TM – City of Fairfield
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RECOMMENDED CAPITAL IMPROVEMENTS
This section presents recommended capital improvements based on the evaluations and assessments summarized previously in this TM. Recommendations presented herein are organized as follows:
• Condition-Based Improvements
• Performance and Operations-Based Improvements
• Expansion-Based Improvements
Proposed phasing and estimated costs for the improvement recommendations will be presented in Chapter 9 of the Master Plan.

Condition-Based Improvements
Condition-based improvement recommendations are summarized by process area in Table 25.

Table 25. Summary of Condition-Based Capital Improvement Recommendations Process Area Recommended Improvement
01 – Operations Building • Complete in-progress laboratory upgrade • Replace original MCCs 1M and E1M
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities
• Replace original HVAC equipment(a)
• Replace instrument AIT-106A
02A – Putah South Canal Intake
and Metering
• Replace original valves and actuators(a)
• Replace original flow meters
• Replace original HVAC equipment(a)
02B – North Bay Aqueduct
Turnout and Metering
• Repair large diameter existing pipe penetrations to arrest leakage • Repair and recoat piping in vicinity of historical leakage • Repair or replace corroded galvanized pipe supports
02C – Raw Water Blending • N/A
03 – Pre-Ozonation • Replace original large diameter valves(a) • Replace original MCC-3M
• Address minor corrosion at small diameter stainless steel ozone piping 04 – Pretreatment • Replace original valves at the flash mix area and flocculation basins(a) • Replace original VFDs for flocculation mixers
• Replace original (1988) MCC-4EM
• Replace corroded HVAC straps within the flash mix vault • Replace original redwood baffles in the flocculation basins • Continue regular inspection and reconditioning of original (1988) flocculation mixer and sedimentation basin chain and flight dives; replace equipment when reconditioning ceases to be cost-effective, or effective in maintaining suitable performance
TM – City of Fairfield
May 24, 2024

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Table 25. Summary of Condition-Based Capital Improvement Recommendations Process Area Recommended Improvement
05 – Filtration • Replace remaining original large diameter valves(a) • Replace or repair remaining large diameter Victaulic couplings; if replacement gaskets cannot be sourced, switch to alternative takedown coupling style
• Replace original MCC-5EM
• Coat or recoat existing corroded galvanized steel pipe and instrument supports
• Recoat flanged piping hardware (bolt and nuts) at connections dismantled during previous improvement projects
• Identify and eliminate leaking through conduits between filter deck and MCC and spare parts rooms
06 – Post-Ozonation • Replace remaining original large diameter valves(a) • If DDW is amenable to removal, remove existing ozone-related equipment (e.g., ozone destruct units, off-gas blowers, purge blower) and terminate all related electrical, instrumentation and piping connections • Replace original MCCs 6EMA and 6EMB
• Investigate reported corrosion on the torsion bar for the contactor effluent valves
07 – Treated Water Pump
Station
• Replace remaining original large diameter isolation valves (primarily butterfly valves) and gearboxes(a)
• Replace original MCCs 7EM1 and 7EM2
• Continue regular inspection and reconditioning of original (1988) treated water and backwash pumps; replace equipment when reconditioning ceases to be cost-effective, or effective in maintaining suitable performance 08 – Ozone Generation & LOX
Storage
• Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities
• Replace original MCCs 8M, 8MA, and 8MB
• Replace original HVAC equipment items (generally exhaust fans and hydronic heaters)(a)
• Address minor corrosion at base plates of horizontal LOX storage vessels • Provide restraints for spare parts on shelves in original gas preparation room 09 – Blower Building • Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities
• Replace original MCCs 9M and 9EM
• Continue regular inspection and maintenance of original positive displacement blowers; replace equipment when maintenance contract ceases to be cost-effective, or effective in maintaining suitable performance. If not before, replace the original blowers as a part of a future NBRWTP expansion, and consider variable speed blowers for replacement units
• Remove existing boiler-related equipment and terminate all related electrical, instrumentation and piping connections
TM – City of Fairfield
May 24, 2024

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Table 25. Summary of Condition-Based Capital Improvement Recommendations Process Area Recommended Improvement
10 – Chemicals • Replace original (1988) chemical storage tanks(a) • Replace existing chemical recirculation pumps
• Replace exposed outdoor chemical piping between storage tanks and chemical metering room, including both steel and PVC piping • Provide weather protection structure for outdoor hydrogen peroxide metering pumps
• Replace insulation at outdoor eyewash and shower units • Address corrosion and recoat deck-mounted baseplate for Vanton pump serving chemical spill containment basins
11 – Washwater Recovery • Replace original MCC 11M
• Replace original 500-gpm washwater return pumps; alternatively, conduct periodic inspection and reconditioning to extend the life of the original pumps
• Continue regular inspection and reconditioning of original (1988) 2,000-gpm washwater return pump; replace unit when reconditioning ceases to be cost-effective, or effective in maintaining suitable performance
12 – Sludge Lagoons • Replace original small-diameter valves(a) 13 – Warehouse Building • Conduct Tier 2 and/or Tier 3 seismic risk assessment(s) to evaluate post-seismic event occupancy capabilities
• Provide restraints for spare parts and equipment stored on shelves Other • Design and construct permanent drainage system for electrical vaults (a) Replacement is recommended during next major process area expansion or modification; in the interim, increase inspection and maintenance frequencies
TM – City of Fairfield
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Performance and Operations-Based Improvements
Performance- and operations-based improvement recommendations are summarized by process area in Table 26.

Table 26. Summary of Performance- and Operations-Based Capital Improvement Recommendations Process Area Recommended Improvement
01 – Operations Building • None identified
02A – Putah South Canal Intake
and Metering • Consider installation of a second screening system for redundancy 02B – North Bay Aqueduct
Turnout and Metering • None identified
02C – Raw Water Blending • None identified
03 – Pre-Ozonation • None identified
04 – Pretreatment • Consider “stress testing” the pretreatment system by operating one or more trains at flows of up to 13.33 mgd each, to assess flocculation and sedimentation performance.
05 – Filtration • Increase washwater equalization basin volume to increase operational flexibility for conducting filter backwashes
• Replace existing filter underdrains with Leopold-style underdrains; this improvement should be timed to coincide with filter media replacements, or with expansion of the filter facility
• Modify gallery to accommodate larger floor-level access doorway on east end of gallery
06 – Post-Ozonation • To provide additional CT, and reduce the amount of future chlorine contact volume required, relocate the existing sodium hypochlorite injection location to the upstream end of the contactors 07 – Treated Water Pump
Station • None identified
08 – Ozone Generation & LOX
Storage
• Complete ongoing feasibility evaluation of the use of onsite oxygen generation systems as a potential means of reducing LOX costs 09 – Blower Building • None identified
10 – Chemicals • Relocate or replace sodium hypochlorite metering pumps to facilitate pedestal mounting and eliminate the existing manufacturer-provided skid. 11 – Washwater Recovery • Increase washwater equalization basin volume to increase operational flexibility for conducting filter backwashes and reduce incidence of washwater overflows
• Install washwater clarifiers to improve (reduce) the turbidity of recycled washwater
12 – Sludge Lagoons • Evaluate existing lagoon decanting operation to identify causes of near-continuous pump station operation (e.g., undersized pumps, undersized discharge piping capacity, etc.), and modify existing pump station
13 – Warehouse Building • None identified
TM – City of Fairfield
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Capacity Rehabilitation Improvements
Capacity rehabilitation improvement recommendations are summarized by process area in Table 27.

Table 27. Summary of Capacity Rehabilitation Capital Improvement Recommendations Process Area Recommended Improvement
01 – Operations Building • None identified
02A – Putah South Canal Intake
and Metering
• None identified
02B – North Bay Aqueduct
Turnout and Metering • None identified
02C – Raw Water Blending • None identified
03 – Pre-Ozonation • None identified
04 – Pretreatment • None identified
05 – Filtration • Conduct Filter Optimization Study
06 – Post-Ozonation • None identified
07 – Treated Water Pump
Station
• None identified
08 – Ozone Generation & LOX
Storage
• None identified
09 – Blower Building • None identified
10 – Chemicals • None identified
11 – Washwater Recovery • Construct one new washwater equalization basin • Construct two washwater clarifiers
• Construct thickened sludge pump station
12 – Sludge Lagoons • None identified
13 – Warehouse Building • None identified
TM – City of Fairfield
May 24, 2024

N-268-60-22-20-WP-TM3
Expansion-Based Improvements
Expansion-based improvements refer to those improvements that are required for the overall expansion of the NBRWTP treatment and hydraulic capacity but which are not otherwise identified as condition- or performance-related improvements. Expansion-based improvement recommendations are summarized by process area in Table 28, assuming a future NBRWTP capacity of 45 to 70 mgd.

Table 28. Summary of Expansion-Based Capital Improvement Recommendations Process Area Recommended Improvement
01 – Operations Building • None identified
02A – Putah South Canal
Intake and Metering
• Install second mechanical screening system in existing open intake structure channel (for 70 mgd scenario)
• Depending on the maximum PSC flow under a 70 mgd NBRWTP scenario, and any corresponding changes to the metering and valve vaults associated with this raw water source, larger and/or parallel raw water pipelines may also be required between the raw water blending vault and the intake
02B – North Bay Aqueduct
Turnout and Metering
• Depending on the maximum NBA flow under a 70 mgd NBRWTP scenario, and any corresponding changes to the metering and valve vaults associated with this raw water source, larger and/or parallel raw water pipelines may also be required between the raw water blending vault and the turnout
02C – Raw Water Blending • Depending on the selected expanded NBRWTP capacity, construct new yard piping between the pre-ozone process area and the raw water blending vault (approximately 100 ft of up to 72-inch diameter piping) 03 – Pre-Ozonation • Construct one or three new pre-ozone contactors or construct new intermediate ozonation process for 45 and 70 mgd scenarios, respectively • Construct additional ozone destruct systems for treating contactor off-gas • Depending on the selected expanded NBRWTP capacity, construct new yard piping between the new pre-ozone contactors and the new pretreatment trains (approximately 200 ft of up to 72-inch diameter piping) 04 – Pretreatment • Construct one new flash mix train (for 70 mgd scenario) • Construct between one and three additional pretreatment trains (i.e., flocculation and sedimentation basins) for 45 and 70 mgd scenarios, respectively
• Depending on the selected expanded NBRWTP capacity, construct new yard piping between the new pretreatment trains and the filtration process area (approximately 600 ft of up to 72-inch diameter piping) • Increase capacity of sedimentation sludge pumping system 05 – Filtration • Construct between one and six new dual media filters • Depending on the selected expanded NBRWTP capacity, construct new yard piping between the new filters and the existing post-ozone contactors and/or new chlorine contact basin (approximately 200 ft of up to 72-inch diameter piping)
TM – City of Fairfield
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N-268-60-22-20-WP-TM3
Table 28. Summary of Expansion-Based Capital Improvement Recommendations Process Area Recommended Improvement
06 – Post-Ozonation • Move sodium hypochlorite injection to upstream end of post-ozonation contactors to increase available CT
• Depending on the selected expanded NBRWTP capacity, construct new yard piping between the existing post-ozone contactors and the new chlorine contact basin (approximately 100 ft of up to 72-inch diameter piping)
07 – Treated Water
Pump Station
• Construct additional chlorine contact volume upstream of the TWPS • Depending on the selected expanded NBRWTP capacity, construct new yard piping between new chlorine contact basin and existing TWPS (approximately 200 ft of up to 72 inch diameter piping) • Replace existing treated water pumps with larger pumps sized to convey expanded range of flows to Fairfield and Vacaville
08 – Ozone Generation &
LOX Storage
• Install at least one new ozone generator in the existing ozone generation building
09 – Blower Building • If not previously completed as a condition-based improvement, replace existing blowers with new blowers
10 – Chemicals • Increase liquid alum and sodium hypochlorite storage capacity, either by replacing existing storage tanks with larger tanks, or by adding one additional tank per chemical
• Install new metering pumps dedicated to additional flash mixing trains • Replace existing metering pump as needed to meet expanded ranges of chemical metering rates for increased NBRWTP production capacities 11 – Washwater Recovery • Construct one new washwater equalization basin • Construct two to three washwater clarifiers
• Construct thickened sludge pump station
12 – Sludge Lagoons • Construct one to two additional sludge lagoons • Increase capacity of existing decant pump station
13 – Warehouse Building • None identified
Condition Assessment of North Bay Regional Water
Treatment Plant, ASTM E2026, ASCE/SEI 41,
and FEMA P-154
Appendix A
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Technical Memorandum
To: Andy Smith, West Yost
From: Daisy Yu, S.E.

Project Name: City of Fairfield Water Utility Master Plan and Rates Study, City of Fairfield, California
Project Number: 122084
Subject: Condition Assessment of North Bay Regional Water Treatment Plant, ASTM E2026, ASCE/SEI 41, and FEMA P-154
File to: 122084 - 6.02
Date: April 14, 2023

1. INTRODUCTION
TJC and Associates, Inc. (TJCAA) performed a condition assessment and seismic risk assessment of the North Bay Regional Water Treatment Plant (Plant). This technical memorandum presents our observations and findings.

Our review was limited to the areas of the facilities that were accessible. TJCAA conducted a seismic risk assessment in accordance with the Standard Guide for Seismic Risk Assessment of Buildings (ASTM E2026), Seismic Evaluation and Retrofit of Existing Buildings (ASCE/SEI 41), and Rapid Visual Screening of Buildings for Potential Seismic Hazards (FEMA P-154).

The procedure adopted by TJCAA follows the guidelines presented in ASTM E2026, with the addition of a Tier 1 Screening per ASCE/SEI 41 and application of FEMA P154 methods for determining a probability of collapse for the structure. The Plant was evaluated relative to the “Immediate Occupancy” structural performance level, which is defined as a post-earthquake damage state in which the facility remains safe to access and essentially retains its pre-earthquake strength and stiffness.

The ASCE/SEI 41 Tier 1 procedure is a preliminary screening tool designed to quickly identify potential seismic deficiencies in the structural lateral force-resisting system and non-structural building systems. The Tier 1 evaluation procedure uses a series of checklists for rapid evaluation of the building while requiring only a minimum level of structural calculations.

On March 2, 2023, James Myers, P.E. conducted a walk-through of the Plant. He performed visual inspection of structural systems and components from the floor.

TJCAA reviewed the conformed plans dated August 5, 1988 as part of this assessment. Analysis of structural elements, if performed, was limited to the “Quick Check” method of ASCE/SEI 41.

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06/23/23

The following structures were inspected during the assessment:
• Operations Building
• Putah South Canal Intake Structure
• Putah South Canal Intake Meter and Valve Vaults
• Pre-Ozonation Basin
• Pre-Ozonation Shade Structure
• Flocculation/Sedimentation Basins
• Flocculation Motor Control Center (MCC) Building
• Filter Basins
• Filter Control Room
• Post-Ozonation Basin
• Post-Ozonation Shade Structure
• Treated Water Pump Station MCC Building
• Ozone Generation Building
• Blower Building
• Washwater Recovery Basin
• Washwater Recovery Pump Station
• Warehouse Shop Building
• North Bay Aqueduct Meter and Valve Vault
• North Bay Aqueduct MCC Building

1.1 DEFINITIONS
Active Fault – A fault with an average historic slip rate of at least 1 millimeter per year and geological evidence of seismic activity within the Holocene time, i.e., during the last 11,000 years
Earthquake – Ground shaking caused by a sudden movement along a fault line Fault – Fracture or crack along which two blocks of rock slide past one another Magnitude – A number that represents the size of an earthquake at the source, as determined by seismographic observations. Although outdated, the Richter Scale is probably the best-known earthquake magnitude scale.

Maximum Considered Earthquake (MCE) – Used by Building Codes to define the maximum considered seismic event. For the structures considered in this report, the MCE has a 2% probability of exceedance within a 50-year period. The MCE is the event considered to be applicable to building code design and is based on probabilistic methods.

Seismic Coefficient – Spectral response acceleration parameters for short periods (SS) and 1-second period (S1), adjusted for Site Class, provided by United States Geological Survey (USGS)
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Seismic Hazard – The potential for damaging effects caused by an earthquake. The degree of damage is a function of magnitude, distance from the epicenter, type of subsurface soils, and duration of shaking. The seismic hazard selected for this assessment is BSE-1E, which corresponds to spectral response accelerations for an earthquake with a 20% probability of exceedance within a 50-year period. These accelerations are lower than the MCE.

Seismic Risk – The probability of damage, loss, or injury resulting from an earthquake Site Class – A classification assigned to a site based on the types of soil present and their engineering properties (ASCE 7)

1.2 LIMITATIONS
The limitation of this evaluation is the absence of geotechnical information for the Plant site.

2. ASSESSMENT METHODS AND APPROACH (ASTM E2026)

2.1 Seismic Ground Motion Hazard Assessment – Level G1 Investigation ASTM E2026, Section 7 states the following:
“The objective of the seismic ground motion hazard assessment is to characterize the earthquake ground motions at the site with a specified probability of being exceeded in a given time period.” Fault and Seismic Sources – The Plant is in a seismically active area of Northern California. Based on a review of the California Earthquake Hazards Zone Application (EQ Zapp, California Department of Conservation), the known significant active faults and seismic sources within 25 miles of the site include the Cordelia (9.5 miles), Green Valley (10.6 miles), West Napa (17.6 miles), and Concord (17.8 miles) Faults.

2.1.1 Finding – Seismic Ground Motion Hazard Assessment According to the USGS, the Short Period (SS) and 1-second Period (S1) Site-Specific Spectral Response Accelerations for the Plant are 1.428g and 0.502g, respectively.

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2.2 Building Stability Assessment – Level BS1-1E Investigation ASTM E2026, Section 8; ASCE/SEI 41; and FEMA P-154 state the following:
“The objective of the building stability assessment is to determine if the building can be reasonably expected to remain stable under earthquake loadings. A building should be deemed stable if it is able to maintain the vertical load-carrying capacity of its structural system under the inelastic deformations caused by the earthquake ground motion prescribed for the building and site by the California Building Code.”
TJCAA performed a Tier 1 screening of the facility, applying the appropriate checklist in ASCE/SEI 41 for reinforced masonry structures, metal frame structures, and coldformed steel light-framed structures, depending on the structure being assessed.

Attachments A and B present sample checklists for the Plant. Information obtained as part of the screening process was then applied to the Rapid Visual Screen worksheet of FEMA P-154 to quantify the “stability” of the structure. The Rapid Visual Screen worksheet establishes a “numeric seismic hazard score” for the structure under consideration. The seismic hazard score is an estimate of the probability that the building will collapse if ground motions that equal or exceed the MCE occur.

Attachment B presents the Rapid Visual Screen worksheet.

The Plant is at 5110 Water Works Lane, in Fairfield, California (Latitude 38.30°N, Longitude 122.97°W). The Plant was constructed in 1991, and its structural elements were designed for the lateral force provisions of the 1985 Uniform Building Code, according to the conformed construction documents reviewed by TJCAA. The Plant consists of several above-grade structures of varying structural systems, with belowgrade cast-in-place concrete basins and vaults.

From observed earthquake damage, it can be inferred that certain structures designed and constructed in accordance with the 1994 Uniform Building Code (or later) can be expected to provide Life Safety-level performance. These “Benchmark Buildings” are reasonably expected to remain stable under earthquake loading. The Warehouse Shop Building has been designated as a Benchmark Building by the City of Fairfield for purposes of this assessment. ASCE 41 Tier 1 evaluations only require the Nonstructural Checklist be completed for Benchmark Buildings.

2.2.1 Finding – Building Stability Assessment
For purposes of this assessment, the structures reviewed were separated into groups based on their structural systems. Each group was evaluated according to the appropriate ASCE 41 checklist. The groups are as follows:
• Metal Building Frames (ASCE 41, Type S3)
o Filter Control Room (B1)
o Post-Ozonation Shade Structure (B2)
• Cold-Formed Steel Light Frame Construction – Strap-Based Wall System (ASCE 41, Type CFS2)
o Operations Building (B3)
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• Reinforced Masonry Bearing Walls (ASCE 41, Type RM1)
o Flocculation MCC Building (B4)
o Treated Water Pump Station MCC Building (B5)
o Blower Building (B6)
o Ozone Generation Building (B7)
o Chemical Metering Building (B8)
o North Bay Aqueduct MCC Building (B9)
• Concrete Vaults and Basins (Outside the Scope of ASCE 41) o Putah South Canal Intake Structure
o Putah South Canal Intake Meter and Valve Vaults
o Pre-Ozonation Basin
o Flocculation/Sedimentation Basins
o Filter Basins
o Post-Ozonation Basin
o Treated Water Meter and Valve Vaults
o Washwater Recovery Basin
o Washwater Recovery Pump Station
o North Bay Aqueduct Meter and Valve Vault
Based on the Tier 1 Screening of ASCE/SEI 41 and on applying the FEMA P-154 Rapid Screening Method, the final seismic hazard scores “S” for the Plant are summarized in the table below. These scores imply there is a chance of 1 in 10Sthat the structure would collapse if the MCE were to occur.

Structure Type Hazard Score “S” Likelihood of Collapse
S3 1.0 1 in 10
CFS2 1.0 1 in 10
RM1 0.7 1 in 5

2.3 Site Stability Assessment
ASTM E2026, Section 9 states the following:
“The objective of the site stability assessment is to determine if the building is located on a site that may be subjected to instability due to earthquake-induced surface fault or soil liquefaction.” Site Geology – The Plant was constructed on predominantly alluvium of the latest Quaternary period (USGS).

Fault Rupture – Damage associated with fault-related ground rupture is normally confined to a fairly narrow zone along the trend of the primary fault and to a lesser extent along secondary faults. The Plant does not lie within the Alquist-Priolo Special Study Zone. In addition, no known active faults traverse the site; as such, surface fault rupture is not anticipated.

Liquefaction – Liquefaction is defined as the transformation of a granular material Https://tjcaa.sharepoint.com/sites/ProjectFiles/2022/122084 - WY, Fairfield WTP Master Plan/6.0/122084 - Technical Memorandum Fairfield NBRWTP (2023-03-29)_cc2_jdm1.docx
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from a solid state into a liquefied state as a consequence of increased pore pressure and decreased effective stress. Liquefaction is the result of cyclic ground vibrations that occur during a seismic event. The Plant is not within the scope of the USGS Liquefaction Susceptibility Map of the San Francisco Bay Area. TJCAA recommends retaining the services of a Geotechnical Engineer licensed in the State of California to accurately assess the liquefaction risk of the site.

Seismic Settlement – Due to the uncertain risk of liquefaction, TJCAA recommends retaining the services of a Geotechnical Engineer licensed in the State of California to accurately assess the seismic settlement risk of the site.

Tsunami – A major hazard associated with earthquakes is water inundation resulting from a tsunami (seismic sea wave). A review of the Tsunami Inundation Map for Emergency Planning, Association of Bay Area Governments1 places the Plant outside the expected inundation zone; therefore, damage to the facility resulting from flooding caused by a tsunami is unlikely.

Slope Instability/Landslide – Slope instability and landslides produced by seismically induced strong ground motions are rare in the relatively flat terrain of the California Central Valley. The site is outside areas identified as having the potential for lateral spreading landslides.

2.3.1 Finding – Site Stability Assessment
The potential for the Plant to be founded on liquefiable soils is unknown; consequently, the potential for seismic settlement resulting from liquefied soil is also unknown. The Plant’s location outside the tsunami inundation zone indicates a low risk of flooding due to tsunami or sea-level rise.

2.4 Building Damageability Assessment
ASTM E2026, Section 10 states the following:
“The objective of the building damageability assessment is to characterize expected earthquake losses associated with earthquake ground shaking and possible other earthquake hazards as prescribed by the User by performing an engineering analysis and evaluation of the damageability characteristics of the building at a given levels of earthquake ground motions.” (ASTM E2026)
Detailed analysis (ASCE 41, Tier 3) of the Plant was not within TJCAA’s Scope of Work. As such, TJCAA did not perform a Building Damageability Assessment.

2.5 Building Content Damageability Assessment
ASTM E2026, Section 11 states the following:
“The objective of the building content damageability assessment is to perform an analysis of the earthquake performance of contents within the building. This analysis is concerned with contents that are not part of the building system.” (ASTM E2026)
1 State of California. 2009. Produced by California Emergency Management Agency, California Geological Survey, and University of Southern California – Tsunami Research Center. June 2009. Mapped at 1:24,000 scale.

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Seismic ruggedness of systems, structures, and components associated with the dayto-day operations of the Plant was not within TJCAA’s Scope of Work. As such, TJCAA did not perform a Building Content Damageability Assessment.

2.6 Business Interruption Assessment
ASTM E2026, Section 12 states the following:
“The objective of the business interruption assessment is to perform an analysis of the site, building equipment, contents, inventory systems, infrastructure, interdependent businesses, and all other relevant parameters to determine if the building will suffer business interruption from onsite effects such as direct damage to buildings and equipment or loss of critical content and supplies.” (ASTM E2026) Seismic ruggedness of systems, structures, and components associated with the dayto-day operations of the Plant was not within TJCAA’s Scope of Work. As such, TJCAA did not perform a Business Interruption Assessment.

3. CONCLUSION AND RECOMMENDATIONS
TJCAA’s recommendations are based on generally accepted standards of engineering practice. TJCAA relied on as-built drawings provided by the City; as such, the opinions presented herein are reflective of the information contained in the as-built drawings.

TJCAA was not retained to, and has not attempted to, identify any errors or omissions in the as-built drawings or deviations from the actual Plant construction. Errors, omissions, or deviations that exist could affect the opinions presented below.

3.1 General Above-Grade Building Recommendations
All three types of above-grade structures had checklist items that TJCAA identified as “non-compliant” or “unknown.” The result of these screenings is that the assessed structures are unlikely to be ready for immediate occupancy following a BSE-1E magnitude seismic event. TJCAA recommends performing a Tier 2, Deficiency-Based Evaluation and a Tier 3, Systematic Evaluation with proposed retrofits. The tables below break down specific non-compliant and unknown items for each group of structures.

Many of the items on the “Nonstructural” Checklist involve the appropriate anchorage of equipment, shelving, and storage cabinets, and the proper storage of heavy items, to reduce the risk of nonstructural items falling and damaging Plant equipment or releasing hazardous materials. A survey of Plant equipment and storage should be conducted to identify items that are unanchored and exceed the weight or aspect ratios that require anchorage by Code.

3.2 General Below-Grade Basin and Vault Recommendations Overall, the Plant facilities appear to be well-maintained and in good condition. Many of the items identified in the previous assessment by Kennedy/Jenks Consultants appear to have been addressed. Rainwater appears to be leaking into many of the below-grade structures through electrical conduits. Evidence of water intrusion was observed in some vaults, possibly due to cracking of the concrete. The basins appear to have a complete, well-defined load path to transfer internal forces to the foundation. Member sizes and reinforcement ratios are within expected ranges for this type of structure.

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Immediate Occupancy for Metal Frame Buildings
Non-Compliant
(NC) or
Unknown (U)
Checklist Item
PostOzonation
Shade
Structure
(B1)
Filter Basin
Control Room
(B2) Comments
Table 17-3
Load Path
(A2.1.1) NC NC
Both B1 and B2 lack a seismic force-resisting system in the direction perpendicular to the building frames (see “Wall Panels” below).

Table 17-13
Steel Columns
(A5.3.1) U U Anchor bolt embedment depth could not be verified.

Wall Panels
(A5.5.2) NC NC
Building frames do not act as a lateral force-resisting system out of plane and rely on the stiffness of wall panels to resist seismic forces. The Filter Basin Control Room has no wall panels to act as shear walls, and the PostOzonation Shade Structure walls are not attached to the building frames.

Out-of-Plane
Bracing
(A3.1.3.11)
U U
Columns are not braced out of plane. Tier 2 assessment
recommended to determine whether bracing is required.

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Immediate Occupancy Checklist for Cold-Formed Steel Light Construction Building Non-Compliant
(NC) or
Unknown (U)
Checklist Item
Operations
Building
(B3) Comments
Table 17-3
Load Path
(A2.1.1) U
Based on the drawings reviewed, it is unclear to TJCAA which walls are shear walls and which are not, so a determination of load path was not possible.

Adjacent
Buildings
(A2.1.2)
NC
Clearance between buildings in high seismic areas should be at least 3% of the height of the shorter building. B8 and B3 are structurally two separate buildings with two different lateral force-resisting systems and are therefore at risk of impacting each other during an earthquake.

Torsion
(A2.2.7) U
Torsional irregularities occur when the distance between the center of rigidity and the center of mass of a structure is greater than 20% of the building width in either plan dimension. It is unclear to TJCAA from the drawings that were reviewed which walls were shear walls and which are not, so an estimate of the center of rigidity was not developed.

Table 17-21
Strap-Braced
Walls – Brace
Axial Stress
(A3.3.1.2)
U
Based on the drawings reviewed, it is unclear to TJCAA which walls are shear walls and which are not, so a determination of brace axial stress was not possible.

Strap-Braced
Walls – Chord
Stud Axial Stress
(A3.3.1.2)
U
Based on the drawings reviewed, it is unclear to TJCAA which walls are shear walls and which are not, so a determination of chord stud axial stress was not possible.

Diaphragm
Continuity
(A4.1.1)
NC The roof diaphragm is discontinuous at Gridline 11 due to a change in deck elevation.

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Immediate Occupancy for Reinforced Masonry Buildings
NonCompliant
(NC) or
Unknown (U)
Checklist Item
Flocculation Motor Control Center (MCC)Building (B4)Treated Water Pump Station MCC (B5)Blower Building (B6)Ozone Generation Building (B7)Chemical Metering Building (B8)North Bay Aqueduct MCC Building (B9) Comments
Table 17-3
Load Path
(A2.1.1) NC NC NC NC
There does not appear to be a connection
between the diaphragm and the reinforced
masonry shear walls capable of transferring
lateral load for B4, B5, and B9. There is also a
discontinuity in load path due to discontinuous
collector at roof opening for seismic loading
perpendicular to roof beams.

Adjacent
Buildings
(A2.1.2)
NC
Clearance between buildings in high seismic
areas should be at least 3% of the height of
the shorter building. B8 and B3 are
structurally two separate buildings with two
different lateral force-resisting systems and
therefore are at risk of impacting each other
during an earthquake.

Table 17-3
5 Transfer to
Shear Walls
(A5.2.1)
NC NC NC See Load Path item above.

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Nonstructural Checklist for Position Retention (Table 17-38) Non-Compliant (NC)
or Unknown (U)
Checklist Item
Evaluation
Statement Comments
Life Safety
Emergency Power
(A7.12.1) U
Equipment used to power or control Life Safety systems should be anchored or braced. The emergency backup generator was observed to be anchored during the field observation, but control equipment was not identified Emergency Lighting
(A7.3.1) NC
Emergency and egress lighting should be anchored or braced. Separate emergency lighting was not observed. Lighting observed during the field observation did not appear to be braced.

Hazardous Materials
Equipment
(A7.12.2) U
Equipment mounted on vibration isolators and containing hazardous materials should be equipped with snubbers or restraints. Equipment on vibration isolators was observed, but no equipment containing hazardous materials was specifically identified.

Distribution
(A7.15.1) U
Piping or ductwork conveying hazardous materials should be braced or otherwise protected from damage that would allow hazardous material release. Piping throughout the site lacked longitudinal and in some cases horizontal bracing; however, it was unclear which piping is carrying materials deemed hazardous.

Flexible Couplings
(A7.15.4) U
Piping containing hazardous material should have flexible couplings. Piping throughout the site was observed to have no flexible couplings.

Piping Crossing Seismic
Joints
(A7.13.6)
U
Piping containing hazardous material that either crosses seismic joints or is connected to independent structures should have flexible couplings to accommodate relative seismic displacements. Piping throughout the site was observed to have no flexible couplings. This is especially a concern for piping between systems or structures with varying stiffnesses, such as the reinforced masonry shear walls of the Ozone Generation Building and the ozone generation equipment skids.

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Non-Compliant (NC)
or Unknown (U)
Checklist Item
Evaluation
Statement Comments
Partitions
Light Partitions
Supported by Ceilings
(A7.2.1)
U
The tops of gypsum board partitions should not be laterally supported by an integrated ceiling system. TJCAA did not find partition wall or integrated ceiling details in the provided drawings.

Tops
(A7.1.4) U
The tops of ceiling-high framed partitions should have lateral bracing to the structure at a spacing of 6 feet or less. TJCAA did not find partition wall details in the provided drawings.

Ceilings
Integrated Ceilings
(A7.2.2) U
Integrated ceilings with areas greater than 144 square feet that are not surrounded by restraining partitions should be laterally restrained at a spacing less than 12 feet with members attached to the structure. TJCAA did not find integrated ceiling details in the provided drawings.

Edge Clearance
(A7.2.4) U
The free edges of suspended integrated ceilings with areas greater than 144 square feet should have clearances from the enclosing wall or partition of at least ¾ inch. TJCAA did not find integrated ceiling details in the provided drawings.

Edge Support
(A7.2.6) U
The free edges of suspended integrated ceilings with areas greater than 144 square feet should be supported by closure angles or channels not less than 2 inches wide. TJCAA did not find integrated ceiling details in the provided drawings.

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Non-Compliant (NC)
or Unknown (U)
Checklist Item
Evaluation
Statement Comments
Masonry Veneer
Ties
(A7.5.1) NC
Masonry veneer should be connected to the backup with corrosion resistant ties with ties spaced no greater than 24 inches. Masonry veneer of the Operations Building appears to be attached to the backup material with ties spaced 48 inches on center.

Contents
Tall Narrow Contents
(A7.11.2) NC Contents more than 6 feet high with a height-to-depth ratio greater than 3-to-1 should be anchored to the structure.

Fall Prone Contents
(A7.11.3) NC
Equipment, stored items, or other content weighing more than 20 pounds should be restrained if stored more than 4 feet off the floor. This was mostly observed in the Warehouse Shop Building and Ozone Generation Building Mechanical and Electrical
Equipment
In-Line Equipment
(A7.12.5) NC
Equipment installed in line with duct or piping system, with an operating weight more than 75 pounds should be laterally braced independent of the ducting or piping system. The HVAC units in the MCC buildings did not appear to have lateral bracing.

Tall Narrow Equipment
(A7.12.6) U
Equipment more than 6 feet in height with a height-to-depth ratio greater than 3-to-1 should be anchored to the floor or adjacent structural walls.

TJCAA was unable to observe the anchorage, or lack of, of a majority of the mechanical and electrical equipment. We recommend doing a survey of the equipment and ensuring it is properly anchored.

Heavy Equipment
(A7.12.10) U
Equipment weighing more than 400 pounds should be anchored to the floor or adjacent structural walls. TJCAA was unable to observe the anchorage, or lack of, of a majority of the mechanical and electrical equipment. We recommend doing a survey of the equipment and ensuring it is properly anchored.

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Non-Compliant (NC)
or Unknown (U)
Checklist Item
Evaluation
Statement Comments
Electrical Equipment
(A7.12.111) U
Electrical equipment should be anchored to the floor or adjacent structural walls. TJCAA was unable to observe the anchorage, or lack of, of a majority of the electrical equipment. We recommend doing a survey of the equipment and ensuring it is properly anchored.

Conduit Couplings
(A7.12.12) NC
Conduits greater than 2.5 inches in diameter that are attached to panels, cabinets, or other equipment and are subject to relative seismic displacement should have flexible couplings or connections. TJCAA observed mostly rigid couplings throughout the site, but most notably in the MCC Buildings.

Piping
Flexible Couplings NC Fluid and gas piping should have flexible couplings. TJCAA observed mostly rigid couplings throughout the site.

Ducts
Duct Bracing
(A7.14.2) NC
Rectangular ductwork larger than 6 square feet in cross-sectional area and round ducts greater than 28 inches in diameter should be braced. The maximum spacing of transverse bracing is 30 feet and the maximum bracing of longitudinal bracing is 60 feet. No bracing was observed during the field observation.

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Field Observations
Observation
Putah South Canal IntakePutah South Canal VaultsPre-Ozonation BasinFlocculation/Sedimentation BasinsFilter BasinPost-Ozonation BasinWashwater Recovery Basin Washwater Recovery Pump Station
North Bay Aqueduct Vault
Comments
Spiderweb
Cracking ● ● ●
Spiderweb cracking was observed in the walls
outside the entry to the vaults.

Water
Intrusion ● ●
Water intrusion was observed at pipe penetrations
into the vaults and basins and at construction joints.

Water was also observed running down the face of
the walls of the vaults and appears to be from recent
rainstorms.

Spalling ● ●
Spalling at the Pre-Ozonation Basin was determined
to be in a low strength concrete cap that was placed
around water stop and rebar intended for future
expansion of the basin. Spalling does not occur in a
structural element.

Spalling at the Flocculation/Sedimentation Basins
occurs at the joint between the
Flocculation/Sedimentation and Flash Mix Basins and
above the walking surface. Spalling at this type of
location is common and does not appear to indicate
underlying issues with the structure.

Previous reports mention spalling in the Washwater
Basin, but TJCAA did not observe any.

NBRWTP Condition Assessment Photographs
Appendix B
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-1 City of Fairfield
NBRWTP Condition Assessment
Process Area 01 – Operations Building
Photo 1.1
In-Progress Laboratory Upgrades
Photo 1.2
MCC 1M
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-2 City of Fairfield
NBRWTP Condition Assessment
Process Area 02A – Putah South Canal Intake and Metering Photo 2A.1
Putah South Canal Intake (Looking North)
Photo 2A.2
Raw Water Screening System (Looking South)
Photo 2A.3
Bay for Future Raw Water Screening Equipment
Photo 2A.4
Raw Water Outlet Valve Actuator
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-3 City of Fairfield
NBRWTP Condition Assessment
Photo 2A.5
PSC Metering Vault
Photo 2A.6
PSC Flow Meter
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-4 City of Fairfield
NBRWTP Condition Assessment
Process Area 02B – North Bay Aqueduct Turnout and Metering Photo 2B.1
NBA Metering Vault
Photo 2B.2
Coating Failure and Corrosion at Wall Penetration
Photo 2B.3
Severe Corrosion at Base of Framing Channel Support
Photo 2B.4
Evidence of Seepage at Pipe Wall Penetration
Photo 2B.5
Corrosion at Conduit Floor Penetrations
Photo 2B.6
Roof Structure over Vault
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-5 City of Fairfield
NBRWTP Condition Assessment
Process Area 02C – Raw Water Blending
Photo 2C.1
Blending Vault and Piping (Looking East)
Photo 2C.2
Blending Vault and Piping (Looking South)
Photo 2C.3
Sump Pump Control Panel
Photo 2C.4
Drain Sump
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-6 City of Fairfield
NBRWTP Condition Assessment
Process Area 03 – Pre-Ozonation
Photo 3.1
Contactor Structure (Looking North)
Photo 3.2
Ozone Destruct Equipment (Looking North)
Photo 3.5
Mild Corrosion at Ozone Distribution Piping
Photo 3.6
Corrosion at Piping Support Hardware
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-7 City of Fairfield
NBRWTP Condition Assessment
Process Area 04 – Pretreatment
Photo 4.1
Flash Mix Pump
Photo 4.2
Chemical Piping Inside Flash Mix Vault
Photo 4.3
Sedimentation Basin with Chain and Flight System
(Looking East)
Photo 4.4
Flocculation Basins with Mixer Drives (Looking West)
Photo 4.5
MCC 4M
Photo 4.5
Redwood Baffle Wall
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-8 City of Fairfield
NBRWTP Condition Assessment
Photo 4.6
Chain and Flight Sludge Collector
Photo 4.7
Sludge Collector Drive
Photo 4.8
Mixer Drives
Photo 4.9
Flocculation Mixer
Photo 4.10
Corrosion at HVAC Duct Support Straps
Photo 4.11
Flocculation Equipment Local Control Panel LCP-1
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-9 City of Fairfield
NBRWTP Condition Assessment
Process Area 05 – Filtration
Photo 5.1
Filter Basin
Photo 5.2
Filter Top Deck (Above Applied Water Channel)
Photo 5.3
Filter Gallery
Photo 5.4
Filter To Waste Pumps
Photo 5.5
Original Large Diameter Isolation Valve and Actuator
Photo 5.6
Typical Filter Gallery Piping with Victaulic Couplings
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-10 City of Fairfield
NBRWTP Condition Assessment
Photo 5.7
Mild Corrosion at Flanged Filter Piping Hardware
Photo 5.8
Corrosion at Framing Channel Support Bases
Photo 5.9
MCC 5M
Photo 5.10
Evidence of Leaking in Electrical Room
Photo 5.11
Access Door at South End of Filter Gallery
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-11 City of Fairfield
NBRWTP Condition Assessment
Process Area 06 – Post-Ozonation
Photo 6.1
Ozone Destruct Equipment (Looking East)
Photo 6.2
Influent End of Contactors (Looking North)
Photo 6.3
Ozone Destruct Equipment (Looking North)
Photo 6.4
Contactor Effluent Valve Actuators
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-12 City of Fairfield
NBRWTP Condition Assessment
Photo 6.5
MCCs 6EMA and 6EMB
Photo 6.6
MCCs 6EMA and 6EMB
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-13 City of Fairfield
NBRWTP Condition Assessment
Process Area 07 – Treated Water Pump Station
Photo 7.1
TWPS (Looking West)
Photo 7.2
Treated Water Discharge Piping (Looking East)
Photo 7.3
Filter Backwash Pumps (Looking West)
Photo 7.4
TWPS Electrical Building / MCCs 7EM1 and 7EM2
Photo 7.5
MCC 7EM2
Photo 7.6
Treated Water Pump Motor Controllers
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-14 City of Fairfield
NBRWTP Condition Assessment
Process Area 08 – Ozone Generation Building and LOX Storage Area Photo 8.1
Ozone Generator and Power Supply Unit
Photo 8.2
Closed Loop Cooling Water Skid
Photo 8.3
Power Supply Unit
Photo 8.4
LOX Vaporizer Inlets
Photo 8.5
LOX Vaporizer Outlets
Photo 8.6
Minor Corrosion at LOX Tank Base Plate
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-15 City of Fairfield
NBRWTP Condition Assessment
Photo 8.7
Storage Shelves in Original Oxygen Preparation Room
Photo 8.8
MCCs 8M, 8MA, and 8MB
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-16 City of Fairfield
NBRWTP Condition Assessment
Process Area 09 – Blower Building
Photo 9.1
Filter Backwash Air Scour Blowers
Photo 9.2
Boiler Equipment
Photo 9.3
Blowers and MCCs
Photo 9.4
Air Compressor and Receiver Tank
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-17 City of Fairfield
NBRWTP Condition Assessment
Process Area 10 – Chemicals
Photo 10.1
Bulk Caustic Storage Tanks
Photo 10.2
Bulk Alum Storage Tanks
Photo 10.3
Typical Storage Tank Recirculation Pump
Photo 10.4
Hydrogen Peroxide Storage Tank
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-18 City of Fairfield
NBRWTP Condition Assessment
Photo 10.5
Vanton Chemical Pump
Photo 10.6
Typical Peristaltic Metering Pumps
Photo 10.7
Typical Diaphragm Metering Pumps
Photo 10.8
Skid-Mounted Sodium Hypochlorite Metering Pumps
Photo 10.9
Chemical Metering Control Panels
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-19 City of Fairfield
NBRWTP Condition Assessment
Process Area 11 – Washwater Recovery
Photo 11.1
Washwater Recovery Basin
Photo 11.2
Washwater Return Pump Station (Looking North)
Photo 11.3
Washwater Recovery Pump Station (Looking East)
Photo 11.4
Washwater Recovery Basin Sludge Pump Station
Photo 11.5
MCC 11M
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-20 City of Fairfield
NBRWTP Condition Assessment
Process Area 12 – Sludge Lagoons
Photo 12.1
Typical Sludge Lagoon and Decant Structure
Photo 12.2
Lagoon Decant Pump Station (Looking West)
Photo 12.3
Lagoon Decant Pump Station Control Panel
Photo 12.4
Sedimentation Sludge Pump Station
Appendix B
NBRWTP Condition Assessment Photographs
N-C-268-60-22-20-WP-TM3
B-21 City of Fairfield
NBRWTP Condition Assessment
Miscellaneous
Photo M1
Typical Water Accumulation in Bottom of Electrical Vault NBRWTP Risk Assessment Asset Level Consequence of
Failure (COF) and Likelihood of Failure (LOF) Ratings
Appendix C

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 01 - Operations Bldg NBR-Building-1 Building and Grounds 1988 None Structure Building Structure 15 Increased
Maintenance Reduced Efficiency 5 6 30 Med-High
NBR 04 - Pretreatment NBR-Building-10 Building and Grounds 1988 None Electrical Building Building Other (Building) 15 No Action Required Process/Facility Cannot Operate Without 3 8 32 High NBR 04 - Pretreatment NBR-Building-11 Building and Grounds 1988 None Equipment Restraint Building Other (Building) 15 Increased
Maintenance
Process/Facility Operates Normally
Without 2 3 15 Low
NBR 05 - Filters NBR-Building-12 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 9 36 High NBR 05 - Filters NBR-Building-13 Building and Grounds 1988 None Electrical Building Building Other (Building) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 06 - Chlorine Contact NBR-Building-14 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 9 36 High NBR 06 - Post-Ozone NBR-Building-15 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 9 36 High NBR 06 - Post-Ozone NBR-Building-16 Building and Grounds 1988 None Shade Structure Building Other (Building) 15 No Action Required Process/Facility Operates Normally
Without 1 4 16 Med-Low
NBR 07 - TWPS NBR-Building-17 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 9 36 High NBR 07 - TWPS NBR-Building-18 Building and Grounds 1988 None Electrical Building Building Other (Building) 15 Increased
Maintenance Process/Facility Cannot Operate Without 4 8 40 High NBR 07 - TWPS NBR-Building-19 Building and Grounds 1988 None Equipment Restraint Building Other (Building) 15 Increased
Maintenance
Process/Facility Operates Normally
Without 2 3 15 Low
NBR 02A - Raw Water - PSC NBR-Building-2 Building and Grounds 1988 None Structure Building Structure 15 Increased
Maintenance Reduced Capacity/Pressure 5 7 35 Med-High
NBR 08 - Ozone Gen / LOX NBR-Building-20 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Reduced Efficiency 4 6 24 Med-High NBR 08 - Ozone Gen / LOX NBR-Building-21 Building and Grounds 1988 None Equipment Restraint Building Other (Building) 15 Increased
Maintenance
Process/Facility Operates Normally
Without 2 3 15 Low
NBR 09 - Blower Bldg NBR-Building-22 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 3 8 32 High NBR 10 - Chemicals NBR-Building-23 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 8 32 High NBR 10 - Chemicals NBR-Building-24 Building and Grounds 1988 None Structure Building Structure 15 Increased
Maintenance Process/Facility Cannot Operate Without 5 8 40 High NBR 10 - Chemicals NBR-Building-25 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Reduced Capacity/Pressure 4 7 28 Med-High NBR 11 - Washwater Recovery NBR-Building-26 Building and Grounds 1988 None Structure Building Structure 15 Increased
Maintenance Process/Facility Cannot Operate Without 5 9 45 High NBR 12 - Drying Beds / Pump Stations NBR-Building-27 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 3 9 36 High NBR 13 - Warehouse Bldg NBR-Building-28 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 4 5 20 Med-High
NBR 13 - Warehouse Bldg NBR-Building-29 Building and Grounds 1988 None Equipment Restraint Building Other (Building) 15 Increased
Maintenance
Process/Facility Operates Normally
Without 2 3 15 Low
NBR 02B - Raw Water - NBA NBR-Building-3 Building and Grounds 1988 None Structure Building Structure 15 Increased
Maintenance Reduced Capacity/Pressure 5 7 35 Med-High
NBR 02B - Raw Water - NBA NBR-Building-4 Building and Grounds 1988 None Electrical Building Building Other (Building) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 02C - Raw Water - Blending NBR-Building-5 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 8 32 High NBR 03 - Pre-Ozone NBR-Building-6 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Reduced Efficiency 4 7 28 Med-High NBR 12 - Drying Beds / Pump Stations NBR-Building-664 Other 2014 1088 DECANT STRUCTURE #1 Building Other (Building) 41 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 6 24 Med-High
NBR 12 - Drying Beds / Pump Stations NBR-Building-666 Other 2014 1092 DECANT STRUCTURE #2 Building Other (Building) 41 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 6 24 Med-High
NBR 12 - Drying Beds / Pump Stations NBR-Building-669 Other 2014 1095 DECANT STRUCTURE #3 Building Other (Building) 41 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 6 24 Med-High
NBR 03 - Pre-Ozone NBR-Building-7 Building and Grounds 1988 None Shade Structure Building Other (Building) 15 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 04 - Flash Mix NBR-Building-8 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 04 - Pretreatment NBR-Building-9 Building and Grounds 1988 None Structure Building Structure 15 No Action Required Process/Facility Cannot Operate Without 4 9 36 High NBR 03 - Pre-Ozone NBR-Blower-1 Mechanical Systems 2021 F-301 F-301 WEST OFF-GAS BLOWER Blower Blower 18 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 5 10 Medium
NBR 03 - Pre-Ozone NBR-Blower-2 Mechanical Systems 2021 F-302 F-302 EAST OFF-GAS BLOWER Blower Blower 18 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 5 10 Medium
NBR 03 - Pre-Ozone NBR-Blower-3 Mechanical Systems 2021 F-303 PRE-OZONE PURGE AIR BLOWER Blower Blower 18 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 4 8 Med-Low
NBR 06 - Post-Ozone NBR-Blower-4 Mechanical Systems 1988 F-601 F-601 NORTH OFF-GAS BLOWER Blower Blower -15 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 3 24 Low
NBR 06 - Post-Ozone NBR-Blower-5 Mechanical Systems 1988 F-602 F-602 SOUTH OFF-GAS BLOWER Blower Blower -15 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 3 24 Low
NBR 06 - Post-Ozone NBR-Blower-6 Mechanical Systems 1988 F-603 POST OZONE PURGE AIR BLOWER Blower Blower -15 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 16 Low
NBR 09 - Blower Bldg NBR-Blower-7 Mechanical Systems 1988 ME-901 COMPRESSOR, PLANT AIR Blower Blower -15 Replace or Run to
Failure Reduced Efficiency 2 6 42 Med-High
NBR 09 - Blower Bldg NBR-Blower-8 Mechanical Systems 1988 ME-904 ME-904 BLOWER, POSITIVE DISP Blower Blower -15 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 09 - Blower Bldg NBR-Blower-9 Mechanical Systems 1988 ME-905 ME-905 BLOWER, POSITIVE DISP Blower Blower -15 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 00-Misc Systems NBR-Communication-1 Other 2023 1194 Phone system Communication Phone System 15 No Action Required Reduced Efficiency 1 6 18 Med-High NBR 00-Misc Systems NBR-Communication-2 Other 2018 1196 Paging system Communication Paging System 10 No Action Required Reduced Efficiency 1 6 24 Med-High NBR 00-Misc Systems NBR-Communication-3 Other 2018 1197 Radio System Communication Radio System 10 No Action Required Reduced Efficiency 1 6 24 Med-High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 01 - Operations Bldg NBR-General Electrical-1
Electrical and Power
Systems 1988 1M General Electrical Other (General Electrical) -15 Rehabilitation Process/Facility Cannot Operate Without 4 9 54 High NBR 03 - Pre-Ozone NBR-General Electrical-10
Electrical and Power
Systems 2018 PLC-3 PLC 3, PRE OZ BASIN General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 04 - Pretreatment NBR-General Electrical-11
Electrical and Power
Systems 1988 1075 BREAKER STGE #1 General Electrical Other (General Electrical) -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 04 - Pretreatment NBR-General Electrical-12
Electrical and Power
Systems 1988 1076 BREAKER, STAGE #2 General Electrical Other (General Electrical) -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 04 - Pretreatment NBR-General Electrical-13
Electrical and Power
Systems 1988 1077 BREAKER, STAGE #3 General Electrical Other (General Electrical) -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 04 - Pretreatment NBR-General Electrical-14
Electrical and Power
Systems 1988 1078 BREAKER, STAGE #4 General Electrical Other (General Electrical) -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 04 - Pretreatment NBR-General Electrical-15
Electrical and Power
Systems 1988 4EDP1 Dist. Panel General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Efficiency 5 7 49 Med-High
NBR 04 - Pretreatment NBR-General Electrical-16
Electrical and Power
Systems 1988 4EM MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 04 - Pretreatment NBR-General Electrical-17
Electrical and Power
Systems 1988 4VFDP1 VFD Panel General Electrical Panel/Switch -15 Rehabilitation Reduced Efficiency 2 7 42 Med-High NBR 04 - Pretreatment NBR-General Electrical-18
Electrical and Power
Systems 2018 PLC-4 PLC 4, FL MIX & FLOCS/SED General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 05 - Filters NBR-General Electrical-19
Electrical and Power
Systems 1988 5EM MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 01 - Operations Bldg NBR-General Electrical-2
Electrical and Power
Systems 1988 E1M General Electrical Other (General Electrical) -15 Rehabilitation Process/Facility Cannot Operate Without 4 9 54 High NBR 05 - Filters NBR-General Electrical-20
Electrical and Power
Systems 2018 PLC-5A PLC 5A, FILTERS General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 05 - Filters NBR-General Electrical-21
Electrical and Power
Systems 2018 PLC-5B PLC 5B, FILTERS General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 05 - Filters NBR-General Electrical-22
Electrical and Power
Systems 2018 SCADA-FILTER COMPUTER, FILTER KIOSK General Electrical Other (General Electrical) 15 No Action Required Reduced Capacity/Pressure 1 7 28 Med-High NBR 06 - Post-Ozone NBR-General Electrical-23
Electrical and Power
Systems 1988 6EMA MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 06 - Post-Ozone NBR-General Electrical-24
Electrical and Power
Systems 1988 6EMB MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 06 - Post-Ozone NBR-General Electrical-25
Electrical and Power
Systems 2018 PLC-6 PLC 6, POST-OZ BASIN General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 07 - TWPS NBR-General Electrical-26
Electrical and Power
Systems 1988 299 SWITCH-GEAR, 21KV HIGH VOLTAGE General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Efficiency 7 7 49 High
NBR 07 - TWPS NBR-General Electrical-27
Electrical and Power
Systems 1988 7DSB Dist. Switchboard General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Efficiency 2 7 49 Med-High
NBR 07 - TWPS NBR-General Electrical-28
Electrical and Power
Systems 1988 7EM1 MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 07 - TWPS NBR-General Electrical-29
Electrical and Power
Systems 1988 7EM2 MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 01 - Operations Bldg NBR-General Electrical-3
Electrical and Power
Systems 2018 PLC-1B PLC 1B, LAB & CHEMICAL AREAS General Electrical PLC 15 No Action Required Reduced Efficiency 1 6 24 Med-High NBR 07 - TWPS NBR-General Electrical-30
Electrical and Power
Systems 1988 MSGR-1 4J6 KV Main Switchgear General Electrical Panel/Switch -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 07 - TWPS NBR-General Electrical-31
Electrical and Power
Systems 1988 MVS-1 4.16 KV MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 07 - TWPS NBR-General Electrical-32
Electrical and Power
Systems 1988 MVS-2 4.16 KV MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 07 - TWPS NBR-General Electrical-33
Electrical and Power
Systems 2018 PLC-7 PLC 7, TREATED WATER General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 07 - TWPS NBR-General Electrical-34
Electrical and Power
Systems 1988 T1 Transformer General Electrical Transformer -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 07 - TWPS NBR-General Electrical-35
Electrical and Power
Systems 1988 T3 Transformer General Electrical Transformer -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 07 - TWPS NBR-General Electrical-36
Electrical and Power
Systems 1988 T4 Transformer General Electrical Transformer -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 08 - Ozone Gen / LOX NBR-General Electrical-37
Electrical and Power
Systems 1988 3MA MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-38
Electrical and Power
Systems 1988 8EMA MCC (Post Ozone) General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-39
Electrical and Power
Systems 1988 8EMB MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 01 - Operations Bldg NBR-General Electrical-4
Electrical and Power
Systems 2018 PLC-25 PLC FOR UPS General Electrical PLC 15 No Action Required Reduced Efficiency 1 6 24 Med-High NBR 08 - Ozone Gen / LOX NBR-General Electrical-40
Electrical and Power
Systems 1988 8LVSB 480 V Main Switchgear General Electrical Panel/Switch -15 Replace or Run to
Failure Process/Facility Cannot Operate Without 7 9 63 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-41
Electrical and Power
Systems 1988 8M MCC (Pre Ozone) General Electrical Motor Control Center -15 Rehabilitation Reduced Efficiency 6 7 42 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-42
Electrical and Power
Systems 1988 8T-A Transformer General Electrical Transformer -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-43
Electrical and Power
Systems 1988 8TSB Tranfers Switch PB General Electrical Panel/Switch -15 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-44
Electrical and Power
Systems 2018 PLC-8 PLC 8, OZ GEN BLDG General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 08 - Ozone Gen / LOX NBR-General Electrical-45
Electrical and Power
Systems 2018 SCADA-OZONE COMPUTER, OZONE GEN General Electrical Other (General Electrical) 15 No Action Required Reduced Capacity/Pressure 1 7 28 Med-High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 08 - Ozone Gen / LOX NBR-General Electrical-46
Electrical and Power
Systems 1988

SWITCHGEAR
DIGITRIPS 480 SWITCHGEAR OZONE GEN BUILDING General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Capacity/Pressure 7 8 56 High
NBR 09 - Blower Bldg NBR-General Electrical-47
Electrical and Power
Systems 1988 9EM MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 09 - Blower Bldg NBR-General Electrical-48
Electrical and Power
Systems 1988 9M MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 09 - Blower Bldg NBR-General Electrical-49
Electrical and Power
Systems 2018 PLC-9 PLC 9, BLOWER BLDG. General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 02A - Raw Water - PSC NBR-General Electrical-5
Electrical and Power
Systems 1988 2EDP2 Dist. Panel General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 10 - Chemicals NBR-General Electrical-50
Electrical and Power
Systems 2018 PLC-26 PLC 26 Chem feed General Electrical PLC 15 No Action Required Reduced Efficiency 1 6 24 Med-High NBR 11 - Washwater Recovery NBR-General Electrical-51
Electrical and Power
Systems 1988 11M MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 11 - Washwater Recovery NBR-General Electrical-52
Electrical and Power
Systems 2018 PLC-11 PLC 11, WWR RECOVERY General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 00-Misc Systems NBR-General Electrical-53
Electrical and Power
Systems 2018 2001 UPS's for PLC Cabinets General Electrical UPS 10 No Action Required Reduced Efficiency 1 6 24 Med-High NBR 00-Misc Systems NBR-General Electrical-54
Electrical and Power
Systems 2018 PLC-27 PLC for Vacaville communication General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 00-Misc Systems NBR-General Electrical-55
Electrical and Power
Systems 2018 UPS-1 PLANT UPS SYSTEM General Electrical UPS 10 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 4 16 Med-Low
NBR 02A - Raw Water - PSC NBR-General Electrical-6
Electrical and Power
Systems 2018 PLC-2b PLC 2B, PUTAH SOUTH CANAL General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 02B - Raw Water - NBA NBR-General Electrical-7
Electrical and Power
Systems 1988 2EDP3 Dist. Panel General Electrical Panel/Switch -15 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 02B - Raw Water - NBA NBR-General Electrical-8
Electrical and Power
Systems 2018 PLC-2C PLC 2C, NBA TURN OUT General Electrical PLC 15 No Action Required Reduced Capacity/Pressure 1 8 32 High NBR 03 - Pre-Ozone NBR-General Electrical-9
Electrical and Power
Systems 1988 3M MCC General Electrical Motor Control Center -15 Rehabilitation Process/Facility Cannot Operate Without 6 9 54 High NBR 00-Misc Systems NBR-Generator-1
Electrical and Power
Systems 1988 ME-902A GENERATOR, DIESEL Generator On-site Generator -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 6 5 40 Med-High
NBR 01 - Operations Bldg NBR-HVAC-1 Mechanical Systems 2012 F-108 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-10 Mechanical Systems 2012 F-110 ACME- EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-11 Mechanical Systems 2012 F-111 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-12 Mechanical Systems 2012 F-112 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-13 Mechanical Systems 2012 F-114 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-14 Mechanical Systems 2012 F-115 PENNBARRY - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-15 Mechanical Systems 2017 NBR-1-HVAC HVAC, OPS BLG EQUIPMENT Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 3 2 8 Med-Low
NBR 01 - Operations Bldg NBR-HVAC-16 Mechanical Systems 2017 P-102 AMTROL - CHILLED WATER PUMP Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-17 Mechanical Systems 2017 P-103 AMTROL- HOT WATER PUMP Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-18 Mechanical Systems 1988 UH-101 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-19 Mechanical Systems 1988 UH-102 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-2 Mechanical Systems 2017 CH-101 CHILLER MAIN Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 3 2 8 Med-Low
NBR 01 - Operations Bldg NBR-HVAC-20 Mechanical Systems 1988 UH-103 TRANE- HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-21 Mechanical Systems 1988 UH-104 TRANE- HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-22 Mechanical Systems 1988 UH-105 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-23 Mechanical Systems 1988 UH-106 MODINE- HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-24 Mechanical Systems 1988 UH-107 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-25 Mechanical Systems 1988 UH-108 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-26 Mechanical Systems 1988 UH-109 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-27 Mechanical Systems 2017 AHU-101 Trane Air Handler(Main Building) Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 3 2 8 Med-Low
NBR 01 - Operations Bldg NBR-HVAC-28 Mechanical Systems 2017 AHU-102 TRANE - AIR HANDLER (Main Building Lab) Heating, Ventilation, and
Cooling Systems Other (HVAC) 24 No Action Required
Process/Facility Operates Normally
Without 3 2 8 Med-Low
NBR 01 - Operations Bldg NBR-HVAC-29 Mechanical Systems 2012 F-113 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-3 Mechanical Systems 2012 F-101 TRANE RETURN FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 02B - Raw Water - NBA NBR-HVAC-30 Mechanical Systems 2018 AHU-203 HEATING AND A/C, NBA POWER BUILDING Heating, Ventilation, and
Cooling Systems Other (HVAC) 25 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 3 4 16 Med-Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 04 - Pretreatment NBR-HVAC-31 Mechanical Systems 2018 AHU-401 HEAT PUMP FLOC BUILDING Heating, Ventilation, and
Cooling Systems Other (HVAC) 25 No Action Required
Process/Facility Operates Normally
Without 3 3 12 Med-Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-32 Mechanical Systems 2023 CH-801 Chiller ozone Heating, Ventilation, and
Cooling Systems Other (HVAC) 30 No Action Required Reduced Efficiency 1 5 10 Medium NBR 08 - Ozone Gen / LOX NBR-HVAC-33 Mechanical Systems 1988 AHU-801 TRANE- AIR HANDLER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 5 5 35 Med-High
NBR 08 - Ozone Gen / LOX NBR-HVAC-34 Mechanical Systems 1988 AHU-802 TRANE - AIR HANDLER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 5 5 35 Med-High
NBR 08 - Ozone Gen / LOX NBR-HVAC-35 Mechanical Systems 1988 AHU-803 TRANE - AIR HANDLER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 5 5 35 Med-High
NBR 08 - Ozone Gen / LOX NBR-HVAC-36 Mechanical Systems 1988 F-801 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-37 Mechanical Systems 1988 F-802 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-38 Mechanical Systems 1988 F-803 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 01 - Operations Bldg NBR-HVAC-4 Mechanical Systems 2012 F-102 TRANE RETURN FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-40 Mechanical Systems 1988 F-805 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-41 Mechanical Systems 1988 F-806 ACME -EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-42 Mechanical Systems 1988 P-801 AMTROL - PUMP Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 08 - Ozone Gen / LOX NBR-HVAC-43 Mechanical Systems 1988 UH-801 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-44 Mechanical Systems 1988 UH-802 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-45 Mechanical Systems 1988 UH-803 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-46 Mechanical Systems 1988 UH-804 TRANE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-47 Mechanical Systems 1988 UH-805 TRANCE - HYDRONIC HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 08 - Ozone Gen / LOX NBR-HVAC-48 Mechanical Systems 1988 FC-801 TRANE - AIR HANDLER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 5 2 14 Medium
NBR 10 - Chemicals NBR-HVAC-49 Mechanical Systems 1988 879 SODIUM HYPO ROOM HEATER Heating, Ventilation, and
Cooling Systems Other (HVAC) -5
Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 2 14 Low
NBR 01 - Operations Bldg NBR-HVAC-5 Mechanical Systems 2012 F-103 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-6 Mechanical Systems 2012 F-104 ACME- EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-7 Mechanical Systems 2012 F-106 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-8 Mechanical Systems 2012 F-107 AMCE - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-HVAC-9 Mechanical Systems 2012 F-109 ACME - EXHAUST FAN Heating, Ventilation, and
Cooling Systems Other (HVAC) 19 No Action Required
Process/Facility Operates Normally
Without 1 2 8 Low
NBR 01 - Operations Bldg NBR-Field Instruments-1
Instrumentation and
Controls 2020 AIR-114-Post Fl2 POST FLUORIDE ANALYZER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 01 - Operations Bldg NBR-Field Instruments-10
Instrumentation and
Controls 2020 AIT-166 TWPS CHLORINE RESIDUAL ANALYZER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12
Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 3 15 Low
NBR 02A - Raw Water - PSC NBR-Field Instruments-11
Instrumentation and
Controls 2010 AIT-104 TURBIDIMETER, SURFACE SCATTER, PSC Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 02A - Raw Water - PSC NBR-Field Instruments-12
Instrumentation and
Controls 1988 FIT-202A PSC 30", FLOW TRANS Field Instruments Flow -20 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 02A - Raw Water - PSC NBR-Field Instruments-13
Instrumentation and
Controls 1988 FIT-202B PSC 54", FLOW, TRANS Field Instruments Flow -20 Replace or Run to
Failure Reduced Efficiency 2 5 35 Medium
NBR 02B - Raw Water - NBA NBR-Field Instruments-14
Instrumentation and
Controls 2010 AIT-105 TURBIDIMETER, SURFACE SCATTER, NBA Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 02B - Raw Water - NBA NBR-Field Instruments-15
Instrumentation and
Controls 2010 FIT-203A 24" NBA Flowmeter Field Instruments Flow 2 Rehabilitation Reduced Efficiency 2 5 30 Medium NBR 02B - Raw Water - NBA NBR-Field Instruments-16
Instrumentation and
Controls 2010 FIT-203B 42" NBA Flowmeter Field Instruments Flow 2 Rehabilitation Reduced Efficiency 2 5 30 Medium NBR 03 - Pre-Ozone NBR-Field Instruments-17
Instrumentation and
Controls 2015 1005 Vent Gas Pre-Ozone Monitor Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 7 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 03 - Pre-Ozone NBR-Field Instruments-18
Instrumentation and
Controls 2018 AIT-301 OFF GAS MONITOR, PRE-OZONE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 10
Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 3 15 Low
NBR 04 - Flash Mix NBR-Field Instruments-19
Instrumentation and
Controls 2013 AE-401 STREAMING CURRENT ANALYZER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 5
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 01 - Operations Bldg NBR-Field Instruments-2
Instrumentation and
Controls 2020 AIT-106 Influent pH transmitter Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 04 - Pretreatment NBR-Field Instruments-20
Instrumentation and
Controls 2016 AIR-402 SETTLED TURBIDIMETER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 8
Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 3 15 Low
NBR 04 - Pretreatment NBR-Field Instruments-21
Instrumentation and
Controls 2016 AIT-403 Basin pH Transmitter Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 8 Rehabilitation
Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-22
Instrumentation and
Controls 2020 AI-511 PARTICLE COUNTER #1 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-23
Instrumentation and
Controls 2020 AI-512 PARTICLE COUNTER #2 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 05 - Filters NBR-Field Instruments-24
Instrumentation and
Controls 2020 AI-513 PARTICLE COUNTER #3 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-25
Instrumentation and
Controls 2020 AI-514 PARTICLE COUNTER #4 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-26
Instrumentation and
Controls 2020 AI-515 PARTICLE COUNTER #5 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-27
Instrumentation and
Controls 2020 AI-516 PARTICLE COUNTER #6 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-28
Instrumentation and
Controls 2020 AI-517 PARTICLE COUNTER #7 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-29
Instrumentation and
Controls 2020 AI-518 PARTICLE COUNTER #8 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 01 - Operations Bldg NBR-Field Instruments-3
Instrumentation and
Controls 2010 AIT-106A TURBIDIMETER, SURFACE SCATTER, PRE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 05 - Filters NBR-Field Instruments-30
Instrumentation and
Controls 2020 AI-519 PARTICLE COUNTER SETTLED Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 05 - Filters NBR-Field Instruments-31
Instrumentation and
Controls 2020 AIT-519 TURBIDIMETER, FILTER 1 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-32
Instrumentation and
Controls 2020 AIT-529 TURBIDIMETER, FILTER # 2 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-33
Instrumentation and
Controls 2020 AIT-539 TURBIDIMETER, FILTER 3 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-34
Instrumentation and
Controls 2020 AIT-549 TURBIDIMETER, FILTER 4 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-35
Instrumentation and
Controls 2020 AIT-559 TURBIDIMETER, FILTER 5 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-36
Instrumentation and
Controls 2020 AIT-569 TURBIDMETER, FILTER 6 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-37
Instrumentation and
Controls 2020 AIT-579 TURBIDIMETER, FILTER 7 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-38
Instrumentation and
Controls 2020 AIT-589 TURBIDIMETER, FILTER 8 Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 05 - Filters NBR-Field Instruments-39
Instrumentation and
Controls 2015

FILTER GALERY
PUM PS LEVEL IND. AT FILTER GALLERY SUMP PUMPS Field Instruments Level Element 7 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 01 - Operations Bldg NBR-Field Instruments-4
Instrumentation and
Controls 2020 AIT-107 TURBIDIMETER, SETTLED WATER (LAB) Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 05 - Filters NBR-Field Instruments-40
Instrumentation and
Controls 2010 FIT-503 BACKWASH FLOW, TRANS, Field Instruments Flow 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 05 - Filters NBR-Field Instruments-41
Instrumentation and
Controls 2010 LI-571 LEVEL INDICATOR, FILTER #1 TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-42
Instrumentation and
Controls 2010 LI-572 LEVEL INDICATOR, FILTER #2, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-43
Instrumentation and
Controls 2010 LI-573 LEVEL INDICATOR FILTER #3, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-44
Instrumentation and
Controls 2010 LI-574 LEVEL INDICATOR FILTER #4, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-45
Instrumentation and
Controls 2010 LI-575 LEVEL INDICATOR FILTER #5, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-46
Instrumentation and
Controls 2010 LI-576 LEVEL INDICATOR FILTER #6, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-47
Instrumentation and
Controls 2010 LI-577 LEVEL INDICATOR, FILTER #7, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-48
Instrumentation and
Controls 2010 LI-578 LEVEL INDICATOR, FILTER #8, TRANS Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Field Instruments-49
Instrumentation and
Controls 2010 PDI-571 HEAD LOSS, TRANS #1 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 01 - Operations Bldg NBR-Field Instruments-5
Instrumentation and
Controls 2020 AIT-108 TURBIDIMETER, CFE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required Process/Facility Cannot Operate Without 1 6 24 Med-High NBR 05 - Filters NBR-Field Instruments-50
Instrumentation and
Controls 2010 PDI-572 HEAD LOSS, TRANS #2 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-51
Instrumentation and
Controls 2010 PDI-573 HEAD LOSS, TRANS #3 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-52
Instrumentation and
Controls 2010 PDI-574 HEAD LOSS, TRANS #4 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-53
Instrumentation and
Controls 2010 PDI-575 HEAD LOSS, TRANS #5 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-54
Instrumentation and
Controls 2010 PDI-576 HEAD LOSS, TRANS #6 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-55
Instrumentation and
Controls 2010 PDI-577 HEAD LOSS, TRANS #7 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 05 - Filters NBR-Field Instruments-56
Instrumentation and
Controls 2010 PDI-578 HEAD LOSS TRANS #8 Field Instruments Pressure 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 06 - Post-Ozone NBR-Field Instruments-57
Instrumentation and
Controls 2020 AI-604 Post Ozone Chlorine Rediual Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 06 - Post-Ozone NBR-Field Instruments-58
Instrumentation and
Controls 2020 AIR-610 PH ANALYZER, POST-OZONE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 07 - TWPS NBR-Field Instruments-59
Instrumentation and
Controls 2010 AIT-116 TURBIDIMETER, TWPS FINISHED Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 01 - Operations Bldg NBR-Field Instruments-6
Instrumentation and
Controls 2020 AIT-109 PH ANALYZER, COUGULATED WATER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 07 - TWPS NBR-Field Instruments-60
Instrumentation and
Controls 2010 FIT-731 TRANS, FAIRFIELD F FLOW Field Instruments Flow 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 07 - TWPS NBR-Field Instruments-61
Instrumentation and
Controls 2010 FIT-733 PLANT WATER FLOW, TRANS Field Instruments Flow 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Field Instruments-62
Instrumentation and
Controls 2010 LIT-720 TWPS level indicator Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Field Instruments-63
Instrumentation and
Controls 2010 LIT-720A TWPS Level Indicator Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 08 - Ozone Gen / LOX NBR-Field Instruments-64
Instrumentation and
Controls 2015 890A Oxygen Sensor East Wall Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 7 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 08 - Ozone Gen / LOX NBR-Field Instruments-65
Instrumentation and
Controls 2015 890B Oxygen Sensor South Wall Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 7 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 08 - Ozone Gen / LOX NBR-Field Instruments-66
Instrumentation and
Controls 2020 AIR-301 MONITOR, PRE-OZONE OFF GAS Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 08 - Ozone Gen / LOX NBR-Field Instruments-67
Instrumentation and
Controls 2020 AIR-823B MONITOR, AMBIENT OZONE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 08 - Ozone Gen / LOX NBR-Field Instruments-68
Instrumentation and
Controls 2011 AIT-830 FEED GAS, MONITOR, PRE-OZONE Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 3 No Action Required Reduced Efficiency 1 4 16 Med-Low NBR 08 - Ozone Gen / LOX NBR-Field Instruments-69
Instrumentation and
Controls 2021 FIT-814 NE-814 COOLING WATER FLOW TRANS Field Instruments Flow 13 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 01 - Operations Bldg NBR-Field Instruments-7
Instrumentation and
Controls 2020 AIT-110 PH ANALYZER, TREATED WATER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required Reduced Efficiency 1 4 16 Med-Low NBR 08 - Ozone Gen / LOX NBR-Field Instruments-70
Instrumentation and
Controls 2021 FIT-815 ME-815 COOLING WATER FLOW TRANS Field Instruments Flow 13 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 10 - Chemicals NBR-Field Instruments-71
Instrumentation and
Controls 2015 FE-002 NONIONIC BATCH METER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 7
Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 3 15 Low
NBR 10 - Chemicals NBR-Field Instruments-72
Instrumentation and
Controls 2010 FIT-103 ALUM FLOW METER Field Instruments Flow 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 10 - Chemicals NBR-Field Instruments-73
Instrumentation and
Controls 2010 FIT-115 CAUSTIC FLOW METER Field Instruments Flow 2 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 10 - Chemicals NBR-Field Instruments-74
Instrumentation and
Controls 2010 FS-132 FLUORIDE FLOW METER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2 Rehabilitation
Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 10 - Chemicals NBR-Field Instruments-75
Instrumentation and
Controls 2010 LI130A LEVEL INDICATOR, DAY TANK Field Instruments Level Element 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 10 - Chemicals NBR-Field Instruments-76
Instrumentation and
Controls 2016 TOC TOC ANALYZER Field Instruments
Field Instruments (pH,
chlorine, turbidity, etc.) 8 Rehabilitation Reduced Efficiency 2 4 24 Med-Low NBR 15 - Spill Containment NBR-Field Instruments-77
Instrumentation and
Controls 2015 CCB-Level Chemical Containment Level Probe Field Instruments Level Element 7 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 11 - Washwater Recovery NBR-Field Instruments-78
Instrumentation and
Controls 2010 AIT-115 Washwater Recover Surface Scatter Turbidity Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 2
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 11 - Washwater Recovery NBR-Field Instruments-79
Instrumentation and
Controls 1988 FIT-023 12" Flowmeter Field Instruments Flow -20 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 01 - Operations Bldg NBR-Field Instruments-8
Instrumentation and
Controls 2020 AIT-113 CONDUCTIVITY ANALYZER, PRE-OZ Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 Rehabilitation
Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 11 - Washwater Recovery NBR-Field Instruments-80
Instrumentation and
Controls 2020 WWRBasin-Level Wash Water Recovery Basin Level (by light) Field Instruments Level Element 12 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Field Instruments-81
Instrumentation and
Controls 2020 WWRPIT-Level WWR PIT LEVEL (PUMP PIT) Field Instruments Level Element 12 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 12 - Drying Beds / Pump Stations NBR-Field Instruments-82 Instrumentation and
Controls 2015 980 LEVEL IND, DECANT PIT, BY LAGOON #2 Field Instruments Level Element 7 Rehabilitation Reduced Capacity/Pressure 2 5 30 Medium NBR 12 - Drying Beds / Pump Stations NBR-Field Instruments-83 Instrumentation and
Controls 2020 SludgePIT-LeveL Sludge Pit Level near Lagoon #1 Field Instruments Level Element 12 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 00-Misc Systems NBR-Field Instruments-84
Instrumentation and
Controls 2018 DIT-480 METER, SLUDGE DENSITY Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 10 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 00-Misc Systems NBR-Field Instruments-85
Instrumentation and
Controls 2010 FIT-732 TRANS, VAVAVILLE FLOW Field Instruments Flow 2 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 00-Misc Systems NBR-Field Instruments-86
Instrumentation and
Controls 2015
PreOzDrainPitLevel Pre Ozone Drain Pit level Probe (Up top) Field InstrumentsField Instruments (pH, chlorine, turbidity, etc.) 7 Rehabilitation
Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 01 - Operations Bldg NBR-Field Instruments-9
Instrumentation and
Controls 2020 AIT-114A-TW Fl2 FLUORIDE TWPS ANALYZER Field Instruments Field Instruments (pH,
chlorine, turbidity, etc.) 12 No Action Required
Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 10 - Chemicals NBR-Mechanical-1 Mechanical Systems 1988 ME-104 SODIUM HYPO ROOM ROLL UP DOOR Mechanical Door 5 Rehabilitation Process/Facility Operates Normally
Without 2 3 18 Low
NBR 04 - Pretreatment NBR-Mechanical-10 Mechanical Systems 1988 MX-401 MX-401 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-11 Mechanical Systems 1988 MX-402 MX-402 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-12 Mechanical Systems 1988 MX-403 MX-403 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-13 Mechanical Systems 1988 MX-404 MX-404 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-14 Mechanical Systems 1988 MX-405 MX-405 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-15 Mechanical Systems 1988 MX-406 MX-406 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-16 Mechanical Systems 1988 MX-407 MX-407 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-17 Mechanical Systems 1988 MX-408 MX-408 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-18 Mechanical Systems 1988 MX-409 MX-409 FLOCCULATOR, STAGE 1 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 04 - Pretreatment NBR-Mechanical-19 Mechanical Systems 1988 MX-410 MX-410 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 02A - Raw Water - PSC NBR-Mechanical-2 Mechanical Systems 2014 C-2228 84"x72" Slide Gate Mechanical #VALUE! Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-20 Mechanical Systems 1988 MX-411 MX-411 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-21 Mechanical Systems 1988 MX-412 MX-412 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-22 Mechanical Systems 1988 MX-413 MX-413 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-23 Mechanical Systems 1988 MX-414 MX-414 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-24 Mechanical Systems 1988 MX-415 MX-415 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-25 Mechanical Systems 1988 MX-416 MX-416 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-26 Mechanical Systems 1988 MX-417 MX-417 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-27 Mechanical Systems 1988 MX-418 MX-418 FLOCCULATOR, STAGE 2 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-28 Mechanical Systems 1988 MX-419 MX-419 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-29 Mechanical Systems 1988 MX-420 MX-420 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 13 - Warehouse Bldg NBR-Mechanical-3 Mechanical Systems 2011 12 DOOR, MOTORIZED, ROLL-UP Mechanical Door 28 Rehabilitation Process/Facility Operates Normally
Without 2 3 18 Low
NBR 04 - Pretreatment NBR-Mechanical-30 Mechanical Systems 1988 MX-421 MX-421 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-31 Mechanical Systems 1988 MX-422 MX-422 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-32 Mechanical Systems 1988 MX-423 MX-423 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-33 Mechanical Systems 1988 MX-424 MX-424 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-34 Mechanical Systems 1988 MX-425 MX-425 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-35 Mechanical Systems 1988 MX-426 MX-426 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-36 Mechanical Systems 1988 MX-427 MX-427 FLOCCULATOR, STAGE 3 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-37 Mechanical Systems 1988 MX-428 MX-428 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-38 Mechanical Systems 1988 MX-429 MX-429 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-39 Mechanical Systems 1988 MX-430 MX-430 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 02A - Raw Water - PSC NBR-Mechanical-4 Mechanical Systems 2011 830 GEAR, BAR SCREEN Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 2 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-40 Mechanical Systems 1988 MX-431 MX-431 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-41 Mechanical Systems 1988 MX-432 MX-432 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-42 Mechanical Systems 1988 MX-433 MX-433 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-43 Mechanical Systems 1988 MX-434 MX-434 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-44 Mechanical Systems 1988 MX-435 MX-435 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-45 Mechanical Systems 1988 MX-436 MX-436 FLOCCULATOR, STAGE 4 Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 4 6 30 Med-High
NBR 04 - Pretreatment NBR-Mechanical-46 Mechanical Systems 2013 ME-401 SLUDGE COLLECTOR, SED #1 Mechanical #VALUE! Increased
Maintenance Reduced Capacity/Pressure 4 8 40 High
NBR 04 - Pretreatment NBR-Mechanical-47 Mechanical Systems 2013 ME-403 SLUDGE COLLECTOR, SED #3 Mechanical #VALUE! Increased
Maintenance Reduced Capacity/Pressure 4 8 40 High
NBR 04 - Pretreatment NBR-Mechanical-48 Mechanical Systems 2013 ME-402 SLUDGE COLLECTOR, SED BASIN #2 Mechanical #VALUE! Increased
Maintenance Reduced Capacity/Pressure 4 8 40 High
NBR 06 - Post-Ozone NBR-Mechanical-49 Mechanical Systems 1988 ME-603 ME-603 NORTH POST OZ DESTRUCT UNIT Mechanical #VALUE! Replace or Run to
Failure
Process/Facility Operates Normally
Without 6 3 24 Med-High
NBR 02A - Raw Water - PSC NBR-Mechanical-5 Mechanical Systems 2011 ME-223A BAR SCREEN Mechanical #VALUE! No Action Required Reduced Efficiency 3 7 28 Med-High NBR 06 - Post-Ozone NBR-Mechanical-50 Mechanical Systems 1988 ME-604 ME-604 SOUTH POST OZ DESTRUCT UNIT Mechanical #VALUE! Replace or Run to
Failure
Process/Facility Operates Normally
Without 6 3 24 Med-High
NBR 08 - Ozone Gen / LOX NBR-Mechanical-51 Mechanical Systems 2011 1134 NITROGEN BOOST GENERATOR Mechanical #VALUE! No Action Required Reduced Efficiency 1 6 24 Med-High NBR 08 - Ozone Gen / LOX NBR-Mechanical-52 Mechanical Systems 2021 ME_815 ME-815 GENERATOR, OZ Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 4 5 20 Med-High
NBR 08 - Ozone Gen / LOX NBR-Mechanical-53 Mechanical Systems 2021 ME-814 ME-814 GENERATOR, OZ Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 4 5 20 Med-High
NBR 08 - Ozone Gen / LOX NBR-Mechanical-54 Mechanical Systems 2021 None Cooling Water Skid 2 Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 5 20 Medium
NBR 08 - Ozone Gen / LOX NBR-Mechanical-55 Mechanical Systems 2021 None Cooling Water Skid 1 Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 5 20 Medium

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 10 - Chemicals NBR-Mechanical-56 Mechanical Systems 1988 872 East Nonionic Batch Mixer Mechanical Mixer -15 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 3 21 Medium
NBR 10 - Chemicals NBR-Mechanical-57 Mechanical Systems 1988 873 West Nonionic Batch Mixer Mechanical Mixer -15 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 3 21 Medium
NBR 08 - Ozone Gen / LOX NBR-Mechanical-58 Mechanical Systems 1988 12C DOOR, MOTORIZED, ROLL-UP Mechanical Door 5 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 3 21 Low
NBR 10 - Chemicals NBR-Mechanical-59 Mechanical Systems 1988 ME-105 DOOR, MOTORIZED, ROLL-UP Mechanical Door 5 Rehabilitation Process/Facility Operates Normally
Without 2 3 18 Low
NBR 02A - Raw Water - PSC NBR-Mechanical-6 Mechanical Systems 2011 ME-223AB MOTOR, BAR SCREEN Mechanical #VALUE! Increased
Maintenance Reduced Efficiency 2 6 30 Med-High
NBR 14-Maintenance Building NBR-Mechanical-60 Mechanical Systems 1988 1104 DOOR, MOTORIZED, ROLL-U[ Mechanical Door 5 Rehabilitation Process/Facility Operates Normally
Without 2 3 18 Low
NBR 00-Misc Systems NBR-Mechanical-61 Mechanical Systems 1988 12B DOOR, MOTORIZED, ROLL-UP Mechanical Door 5 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 3 21 Low
NBR 03 - Pre-Ozone NBR-Mechanical-7 Mechanical Systems 2021 None Ozone Diffusers (114) Mechanical #VALUE! No Action Required Process/Facility Cannot Operate Without 2 9 27 High NBR 03 - Pre-Ozone NBR-Mechanical-8 Mechanical Systems 2021 ME-303 ME-303 WEST PRE OZ DESTRUCT UNIT Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 5 10 Medium
NBR 03 - Pre-Ozone NBR-Mechanical-9 Mechanical Systems 2021 ME-304 ME-304 EAST PRE-OZ DESTRUCT UNIT Mechanical #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 5 10 Medium
NBR 05 - Filters NBR-Other-1 Other 1988 NBR-53 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-10 Other 1988 NBR-5G AREA, FILTER GALLERY Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 05 - Filters NBR-Other-11 Other 2018 NBR-5K AREA, FILTER KIOSK BLDG Other / Uncategorized Other / Uncategorized #VALUE! No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 5 20 Medium
NBR 12 - Drying Beds / Pump Stations NBR-Other-12 Other 1988 SL-2 AREA, SLUDGE LAGOON #2 Other / Uncategorized Other / Uncategorized #VALUE! Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 5 30 Medium
NBR 12 - Drying Beds / Pump Stations NBR-Other-13 Other 1988 SL-3 AREA, SLUDGE LAGOON #3 Other / Uncategorized Other / Uncategorized #VALUE! Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 5 30 Medium
NBR 05 - Filters NBR-Other-2 Other 1988 NBR-54 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-3 Other 1988 NBR-55 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-4 Other 1988 NBR-56 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-5 Other 1988 NBR-57 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 10 - Chemicals NBR-Other-594 Other 1988 999 EYEWASH STATIONS Other / Uncategorized Eyewash #VALUE! Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 10 - Chemicals NBR-Other-599 Other 1988 1008 EYEWASH STATIONS Other / Uncategorized Eyewash #VALUE! Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 05 - Filters NBR-Other-6 Other 1988 NBR-58 AREA, FILTER Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 12 - Drying Beds / Pump Stations NBR-Other-665 Other 1988 SL-1 AREA, SLUDGE LAGOON #1 Other / Uncategorized Other / Uncategorized #VALUE! Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 5 30 Medium
NBR 12 - Drying Beds / Pump Stations NBR-Other-670 Other 2011 1101 DRAIN, SLUDGE LAGOON #4 Other / Uncategorized Other / Uncategorized #VALUE! Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 05 - Filters NBR-Other-7 Other 1988 NBR-51 AREA, FILTER #1 Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-8 Other 1988 NBR-52 AREA, FILTER #2 Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Other-9 Other 1988 NBR-5D AREA, FILTER DECK Other / Uncategorized Other / Uncategorized #VALUE! Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 01 - Operations Bldg NBR-Pump-1 Mechanical Systems 2012 P-105 PUMP, LAB VACUUM Pump Other (Pump) 19 No Action Required Process/Facility Operates Normally
Without 1 2 8 Low
NBR 04 - Flash Mix NBR-Pump-10 Mechanical Systems 2010 P-404 FLASH MIX PUMP Pump Other (Pump) 17 Increased
Maintenance Reduced Efficiency 4 7 35 Med-High
NBR 02B - Raw Water - NBA NBR-Pump-106 Mechanical Systems 2012 P-208 NBA SAMPLE PUMP Pump Other (Pump) 19 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 04 - Flash Mix NBR-Pump-11 Mechanical Systems 2015 P-401 SOUTH SUMP PUMP, FLASH MIX Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 04 - Flash Mix NBR-Pump-12 Mechanical Systems 2015 P-402 NORTH SUMP PUMP, FLASH MIX Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 04 - Flash Mix NBR-Pump-13 Mechanical Systems 2012 P-403 COUGULATION SAMPLE PUMP Pump Sample 4 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 04 - Pretreatment NBR-Pump-14 Mechanical Systems 2015 Sed-pump Pump at end of sed. basin. Pump Other (Pump) 22 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Pump-15 Mechanical Systems 2015 P-505 P-505 SUMP PUMP, FILTER GALLERY Pump Sump 22 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Pump-16 Mechanical Systems 2015 P-506 P-506 SUMP PUMP, FILTER GALLERY Pump Sump 22 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 05 - Filters NBR-Pump-17 Mechanical Systems 2020 P-507 P-507 FILTER TO WASTE PUMP Pump Other (Pump) 27 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 05 - Filters NBR-Pump-18 Mechanical Systems 2020 P-508 P-508 FILTER TO WASTE, PUMP Pump Other (Pump) 27 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 05 - Filters NBR-Pump-19 Mechanical Systems 2015 P-504 SETTLED WATER SAMPLE PUMP Pump Sample 7 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 02A - Raw Water - PSC NBR-Pump-2 Mechanical Systems 2015 P-201 SOUTH SUMP PUMP, PSC METER Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 05 - Filters NBR-Pump-20 Mechanical Systems 2015 1009 WASH DOWN BOOSTER PUMP Pump Other (Pump) 22 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 06 - Post-Ozone NBR-Pump-23 Mechanical Systems 2012 p-602a PUMP, SAMPLE, POST-OZONE FOR LAB Pump Sample 4 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 06 - Post-Ozone NBR-Pump-24 Mechanical Systems 2012 p-602b Pump, sample at post ozone P-602B Pump Sample 4 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 06 - Post-Ozone NBR-Pump-25 Mechanical Systems 2012 P-604 PUMP, SAMPLE, POST-OZ DSLVD Pump Sample 4 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 07 - TWPS NBR-Pump-26 Mechanical Systems 2015 981 SUMP PUMP, FF METER VAULT Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 07 - TWPS NBR-Pump-27 Mechanical Systems 1988 P-701 P-701 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-28 Mechanical Systems 1988 P-702 P-702 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 07 - TWPS NBR-Pump-29 Mechanical Systems 1988 P-703 P-703 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 02A - Raw Water - PSC NBR-Pump-3 Mechanical Systems 2015 P-202 NORTH SUMP PUMP, PSC METER Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 07 - TWPS NBR-Pump-30 Mechanical Systems 1988 P-704 P-704 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-31 Mechanical Systems 1988 P-705 P-705 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-32 Mechanical Systems 1988 P-706 P-706 VERTICAL TURBINE, PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 07 - TWPS NBR-Pump-33 Mechanical Systems 1988 P-709 P-709 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 07 - TWPS NBR-Pump-34 Mechanical Systems 1988 P-710 P-710 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 07 - TWPS NBR-Pump-35 Mechanical Systems 1988 P-711 P-711 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-36 Mechanical Systems 1988 P-712 P-712 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-37 Mechanical Systems 1988 P-713 P-713 VERTICAL TURBINE, PUMP Pump Vertical Turbine -5 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 07 - TWPS NBR-Pump-38 Mechanical Systems 1988 P-715 P-715 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 07 - TWPS NBR-Pump-39 Mechanical Systems 1988 P-716 P-716 VERTICLE TURBINE PUMP Pump Vertical Turbine -5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 02A - Raw Water - PSC NBR-Pump-4 Mechanical Systems 2015 1004 Sample Pump, PSC Pump Sample 7 Increased
Maintenance Reduced Efficiency 2 4 20 Med-Low
NBR 10 - Chemicals NBR-Pump-40 Mechanical Systems 2022 FD-103 FD-103 ALUM PUMP, CHEM FD Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-41 Mechanical Systems 2022 FD-104 FD-104 ALUM PUMP, CHEM FD, LIQUID Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-42 Mechanical Systems 2022 FD-105 FD-105 ALUM PUMP, CHEM FD, LIQUID Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-43 Mechanical Systems 2020 FD-106 FD-106 FLUORIDE PUMP, CHEM FD Pump Chemical Feed 12 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-44 Mechanical Systems 2020 FD-107 FD-107 FLUORIDE PUMP, CHEM FD Pump Chemical Feed 12 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-45 Mechanical Systems 2019 FD-108 FD-108 NONIONIC POLY PUMP, CHEM FD Pump Other (Pump) 26 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 10 - Chemicals NBR-Pump-46 Mechanical Systems 2019 FD-109 FD-109 NONIONIC POLY PUMP CHEM FD Pump Other (Pump) 26 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 10 - Chemicals NBR-Pump-47 Mechanical Systems 2019 FD-110 FD-110 CATIONIC POLY PUMP, CHEM FD Pump Other (Pump) 26 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 10 - Chemicals NBR-Pump-48 Mechanical Systems 2019 FD-111 FD-111 CATIONIC POLY , PUMP, CHEM FD Pump Other (Pump) 26 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 10 - Chemicals NBR-Pump-49 Mechanical Systems 2018 FD-112 PAC POLY PUMPS Pump Other (Pump) 25 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 02B - Raw Water - NBA NBR-Pump-5 Mechanical Systems 2015 P-203 WEST SUMP PUMP, NBA VAULT Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 10 - Chemicals NBR-Pump-50 Mechanical Systems 2018 FD-113 PAC POLY PUMPS Pump Other (Pump) 25 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 3 12 Med-Low
NBR 10 - Chemicals NBR-Pump-51 Mechanical Systems 2022 FD-114 FD-114 CAUSTIC SODA, PUMP, CHEM FD Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-52 Mechanical Systems 2022 FD-115 FD-115 CAUSTIC SODA PUMP, CHEM FD Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-53 Mechanical Systems 2022 FD-116 FD-116 CAUSTIC SODA, PUMP, CHEM FD Pump Other (Pump) 29 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 2 3 9 Low
NBR 10 - Chemicals NBR-Pump-54 Mechanical Systems 2011 FD-120 FD-120 SODIUM HYPOCHLORITE PUMP, CHEM FD Pump Other (Pump) 18 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 3 18 Med-Low
NBR 10 - Chemicals NBR-Pump-55 Mechanical Systems 2011 FD-121 FD-121 SODIUM HYPOCHLORITE PUMP, CHEM FD Pump Other (Pump) 18 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 3 18 Med-Low
NBR 10 - Chemicals NBR-Pump-56 Mechanical Systems 2011 FD-122 FD-122 SODIUM HYPOCHLORITE PUMP, CHEM FD Pump Other (Pump) 18 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 3 18 Med-Low
NBR 10 - Chemicals NBR-Pump-57 Mechanical Systems 2012 FD-118 FD- 118 HYDROGEN PEROXIDE FEED PUMP Pump Other (Pump) 19 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 3 18 Med-Low
NBR 10 - Chemicals NBR-Pump-58 Mechanical Systems 2012 FD-119 FD-119 HYDORGEN PEROXIDE FEED PUMP Pump Other (Pump) 19 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 3 18 Med-Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 10 - Chemicals NBR-Pump-59 Mechanical Systems 2014 NBR-VAN VANTON PUMP Pump Other (Pump) 21 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 4 24 Medium
NBR 02B - Raw Water - NBA NBR-Pump-6 Mechanical Systems 2015 P-204 EAST SUMP PUMP, NBA VAULT Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 10 - Chemicals NBR-Pump-60 Mechanical Systems 2015 P-012 WEST RECIRCULATION CAUSTIC PUMP Pump Chemical Feed 7 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 10 - Chemicals NBR-Pump-61 Mechanical Systems 2015 P-013 EAST RECIRCULATION CAUSTIC PUMP Pump Chemical Feed 7 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 10 - Chemicals NBR-Pump-62 Mechanical Systems 2015 P-014 WEST RECIRULATION SODIUM HYPOCHLORITE PUMP Pump Chemical Feed 7 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 24 Low
NBR 10 - Chemicals NBR-Pump-63 Mechanical Systems 2013 P-015 EAST RECIRCULATION SODIUM HYPOCHLORITE PUMP Pump Chemical Feed 5 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 11 - Washwater Recovery NBR-Pump-64 Mechanical Systems 2008 P-003 P-003 WWR SLUDGE PUMP Pump Sludge 15 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 4 24 Medium
NBR 11 - Washwater Recovery NBR-Pump-65 Mechanical Systems 2008 P-004 P-004 WWR SLUDGE PUMP Pump Sludge 15 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 4 24 Medium
NBR 11 - Washwater Recovery NBR-Pump-66 Mechanical Systems 1988 P-006 P-006 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 11 - Washwater Recovery NBR-Pump-67 Mechanical Systems 1988 P-007 P-007 VERTICAL TURVINE PUMP Pump Vertical Turbine -5 Rehabilitation Reduced Efficiency 4 7 42 Med-High NBR 11 - Washwater Recovery NBR-Pump-68 Mechanical Systems 1988 P-008 P-008 VERTICAL TURBINE PUMP Pump Vertical Turbine -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 12 - Drying Beds / Pump Stations NBR-Pump-69 Mechanical Systems 2021 P-009 P-009 SLUDGE PUMP Pump Sludge 28 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 4 24 Medium
NBR 03 - Pre-Ozone NBR-Pump-7 Mechanical Systems 2015 22 SAMPLE PUMP, PRE-OZONE INFLUENT Pump Sample 7 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 12 - Drying Beds / Pump Stations NBR-Pump-70 Mechanical Systems 2021 P-010 P-010 SLUDGE PUMP Pump Sludge 28 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 4 24 Medium
NBR 12 - Drying Beds / Pump Stations NBR-Pump-71 Mechanical Systems 1988 P-001 PUMP, DECANT LAGOON Pump Other (Pump) -5 Replace or Run to
Failure Reduced Capacity/Pressure 6 5 40 Med-High
NBR 12 - Drying Beds / Pump Stations NBR-Pump-72 Mechanical Systems 1988 P-002 PUMP, DECANT LAGOON Pump Other (Pump) -5 Replace or Run to
Failure Reduced Capacity/Pressure 6 5 40 Med-High
NBR 00-Misc Systems NBR-Pump-73 Mechanical Systems 2018 1159 SUMP PUMP, SLUDGE DENSITY PIT Pump Sump 25 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 00-Misc Systems NBR-Pump-74 Mechanical Systems 2018 P-719 VV METER VAULT SUMP PUMP Pump Sump 25 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 00-Misc Systems NBR-Pump-75 Mechanical Systems 2018 NBR-Z SUMP PUMP NEAR STAIRS GOING TO POST OZONE Pump Sump 25 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 03 - Pre-Ozone NBR-Pump-8 Mechanical Systems 2015 P-302 PRE-OZONE BASIN SUMP PUMP Pump Sump 22 Rehabilitation Process/Facility Operates Normally
Without 2 2 12 Low
NBR 03 - Pre-Ozone NBR-Pump-9 Mechanical Systems 2012 P-212 SAMPLE PUMP, PRE-OZONE EFFLUENT Pump Sample 4 Replace or Run to
Failure Reduced Efficiency 2 4 28 Med-Low
NBR 01 - Operations Bldg NBR-SCADA/Telemetry-1
Instrumentation and
Controls 2018 SCADA-NORTH SCADA, NORTH SCADA/Telemetry SCADA/Telemetry 15 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 01 - Operations Bldg NBR-SCADA/Telemetry-2
Instrumentation and
Controls 2018 SCADA-SOUTH SCADA, SOUTH SCADA/Telemetry SCADA/Telemetry 15 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 00-Misc Systems NBR-Security-1 Other 2023 1195 Security camera system Security Alarm System 15 No Action Required Reduced Efficiency 2 6 18 Med-High NBR 00-Misc Systems NBR-Security-2 Other 2018 Text -Alarms Text Alarm System Security Alarm System 10 Rehabilitation Reduced Efficiency 2 5 30 Medium NBR 07 - TWPS NBR-Tanks-1 Building and Grounds 1988 T-717 FAIRFIELD SURGE TANK Tanks Surge -5 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 10 - Chemicals NBR-Tank-10 Building and Grounds 1988 T-002 T-002 EAST ALUM TANK Tanks Chemical -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 10 - Chemicals NBR-Tank-11 Building and Grounds 1988 T-003 T-003 FLUORIDE TANK Tanks Chemical -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 10 - Chemicals NBR-Tank-12 Building and Grounds 1988 T-004 T-004 WEST CAUSTIC SODA TANK Tanks Chemical -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 10 - Chemicals NBR-Tank-13 Building and Grounds 1988 T-005 T-005 EAST CAUSTIC SODA TANK Tanks Chemical -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 10 - Chemicals NBR-Tank-14 Building and Grounds 2012 T-007 HYDROGEN PEROXIDE TANK Tanks Chemical 19 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 10 - Chemicals NBR-Tank-15 Building and Grounds 2011 T-008 T-008 WEST SODIUM HYPOCHLORITE TANK Tanks Chemical 18 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 5 20 Medium
NBR 10 - Chemicals NBR-Tank-16 Building and Grounds 2011 T-009 T-009 EAST SODIUM HYPOCHLORITE TANK Tanks Chemical 18 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 3 5 20 Medium
NBR 07 - TWPS NBR-Tank-2 Building and Grounds 1988 T-718 VACAVILLE SURGE TANK Tanks Surge -5 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 08 - Ozone Gen / LOX NBR-Tank-3 Building and Grounds 2011 ME-840 LOX Tower Tanks Chemical 18 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 08 - Ozone Gen / LOX NBR-Tank-4 Building and Grounds 2011 ME-850 LOX Tower Tanks Chemical 18 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 08 - Ozone Gen / LOX NBR-Tank-5 Building and Grounds 2011 ME-860 LOX Tower Tanks Chemical 18 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 08 - Ozone Gen / LOX NBR-Tank-6 Building and Grounds 2011 T-810 15,000 Gallon LOX Tank Tanks Chemical 18 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 08 - Ozone Gen / LOX NBR-Tank-7 Building and Grounds 2011 T-820 22,500 Gallon LOX Tank Tanks Chemical 18 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 4 5 25 Med-High
NBR 10 - Chemicals NBR-Tank-8 Building and Grounds 2011 T-112 DAY TANK, SODIUM HYPOCHLORITE Tanks Chemical 18 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 4 5 30 Med-High
NBR 10 - Chemicals NBR-Tank-9 Building and Grounds 1988 T-001 T-001 WEST ALUM TANK Tanks Chemical -5 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 5 35 Med-High
NBR 02A - Raw Water - PSC NBR-Valves-1 Mechanical Systems 1988 FV-202A 30" PSC VALVE Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 03 - Pre-Ozone NBR-Valves-10 Mechanical Systems 1988 FV-303 EFFLUENT VALVE, NORTH PRE-OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 6 42 Med-High
NBR 05 - Filters NBR-Valves-100 Mechanical Systems 2010 FV-524 WASTE WATER VALVE FILTER #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-101 Mechanical Systems 2011 FV-544 WASTE WATER VALVE FILTER #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-102 Mechanical Systems 2010 FV-564 WASTE WATER VALVE FILTER #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-103 Mechanical Systems 2010 FV-584 WASTE WATER VALVE FILTER #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 06 - Post-Ozone NBR-Valves-104 Mechanical Systems 1988 HV-601/602 72" Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 06 - Post-Ozone NBR-Valves-105 Mechanical Systems 1988 FV-601 INFLUENT VALVE, NORTH POST OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure Reduced Efficiency 5 7 49 Med-High
NBR 06 - Post-Ozone NBR-Valves-106 Mechanical Systems 1988 FV-602 INFLUENT VALVE, SOUTH POST OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure Reduced Efficiency 5 7 49 Med-High
NBR 06 - Post-Ozone NBR-Valves-107 Mechanical Systems 1988 FV-603 EFFLUENT VALVE, NORTH POST OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure Reduced Efficiency 5 7 49 Med-High
NBR 06 - Post-Ozone NBR-Valves-108 Mechanical Systems 1988 FV-604 EFFLUENT VALVE, SOUTH POST OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure Reduced Efficiency 5 7 49 Med-High
NBR 07 - TWPS NBR-Valves-109 Mechanical Systems 2021 PRV-701 VALVE, PRES REDUCING Valves Other (Valves) 23 No Action Required Reduced Efficiency 1 4 8 Med-Low NBR 03 - Pre-Ozone NBR-Valves-11 Mechanical Systems 1988 FV-304 EFFLUENT VALVE, SOUTH PRE-OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 6 42 Med-High
NBR 07 - TWPS NBR-Valves-110 Mechanical Systems 1988 HV-701 12" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-111 Mechanical Systems 1988 HV-702 16" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-112 Mechanical Systems 1988 HV-703 16" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-113 Mechanical Systems 1988 HV-704 20" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-114 Mechanical Systems 1988 HV-705 20" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-115 Mechanical Systems 1988 HV-706 20" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-116 Mechanical Systems 1988 FV-709 12" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-117 Mechanical Systems 1988 FV-710 12" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-118 Mechanical Systems 1988 FV-711 16" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-119 Mechanical Systems 1988 FV-712 16" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 04 - Pretreatment NBR-Valves-12 Mechanical Systems 1988 HV 412 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 07 - TWPS NBR-Valves-120 Mechanical Systems 1988 FV-713 16" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-121 Mechanical Systems 1988 FV-715 30" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 07 - TWPS NBR-Valves-122 Mechanical Systems 1988 FV-716 30" Control Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 07 - TWPS NBR-Valves-123 Mechanical Systems 1988 Vacaville ARV Vacaville ARV 1 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-124 Mechanical Systems 1988 Vacaville ARV Vacaville ARV 2 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-125 Mechanical Systems 1988 Vacaville ARV Vacaville ARV 3 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-126 Mechanical Systems 1988 Vacaville ARV Vacaville ARV 4 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-127 Mechanical Systems 1988 Vacaville ARV Vacaville ARV 5 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-128 Mechanical Systems 1988 Fairfield ARV Fairfield ARV 1 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-129 Mechanical Systems 1988 Fairfield ARV Fairfield ARV 2 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 04 - Pretreatment NBR-Valves-13 Mechanical Systems 1988 HV 413 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 07 - TWPS NBR-Valves-130 Mechanical Systems 1988 Fairfield ARV Fairfield ARV 3 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-131 Mechanical Systems 1988 Fairfield ARV Fairfield ARV 4 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-132 Mechanical Systems 1988 Fairfield ARV Fairfield ARV 5 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-133 Mechanical Systems 1988
Backwash
Pumps ARV Backwash Pumps ARV 1 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-134 Mechanical Systems 1988
Backwash
Pumps ARV Backwash Pumps ARV 2 Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-135 Mechanical Systems 2018
HV-715 -
Fairfield
Isolation 42" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 3 9 36 High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 07 - TWPS NBR-Valves-136 Mechanical Systems 2018
HV-716 Vacaville
Isolation 30" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 3 9 36 High NBR 07 - TWPS NBR-Valves-137 Mechanical Systems 1988
HV-717 Fairfield
Surge Tank 14" Valve Valves Other (Valves) -10
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 5 35 Medium
NBR 07 - TWPS NBR-Valves-138 Mechanical Systems 1988
HV-718 Vacaville
Surge Tank 14" Valve Valves Other (Valves) -10
Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 5 35 Medium
NBR 07 - TWPS NBR-Valves-139 Mechanical Systems 2015 HV-719 Valves Valves Other (Valves) 17 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 04 - Pretreatment NBR-Valves-14 Mechanical Systems 1988 HV 414 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 07 - TWPS NBR-Valves-140 Mechanical Systems 2015 HV-720 Valves Valves Other (Valves) 17 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-141 Mechanical Systems 2015 HV-721 Valves Valves Other (Valves) 17 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-142 Mechanical Systems 1988 HV-722 72" Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 07 - TWPS NBR-Valves-143 Mechanical Systems 1988 HV-725 Valves Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 07 - TWPS NBR-Valves-144 Mechanical Systems 1988 HV-726 Valves Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 07 - TWPS NBR-Valves-145 Mechanical Systems 1988 HV-727 Valves Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 3 21 Low
NBR 07 - TWPS NBR-Valves-146 Mechanical Systems 2015 HV-728 Valves Valves Other (Valves) 17 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 3 18 Low
NBR 07 - TWPS NBR-Valves-147 Mechanical Systems 2011 CV-701 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-148 Mechanical Systems 2011 CV-702 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-149 Mechanical Systems 2011 CV-703 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 04 - Pretreatment NBR-Valves-15 Mechanical Systems 1988 HV 415 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 07 - TWPS NBR-Valves-150 Mechanical Systems 2011 CV-704 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-151 Mechanical Systems 2011 CV-705 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-152 Mechanical Systems 2011 CV-706 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-153 Mechanical Systems 2011 CV-709 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-154 Mechanical Systems 2011 CV-710 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-155 Mechanical Systems 2011 CV-711 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-156 Mechanical Systems 2011 CV-712 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 07 - TWPS NBR-Valves-157 Mechanical Systems 2011 CV-713 Valves Valves Other (Valves) 13 Increased
Maintenance
Lack of Redundancy/Potential Reduced
Efficiency 2 5 25 Medium
NBR 08 - Ozone Gen / LOX NBR-Valves-158 Mechanical Systems 2011 MV-880 LOX Isolation Valve Valves Other (Valves) 13 Increased
Maintenance Reduced Efficiency 2 6 30 Med-High
NBR 09 - Blower Bldg NBR-Valves-159 Mechanical Systems 1988 CV-901/902 12" Valves Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 04 - Pretreatment NBR-Valves-16 Mechanical Systems 1988 HV 416 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 10 - Chemicals NBR-Valves-160 Mechanical Systems 1988 HV-020/021 6" Valves Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 11 - Washwater Recovery NBR-Valves-161 Mechanical Systems 2020 CV-001 Valves Valves Other (Valves) 22 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Valves-162 Mechanical Systems 2020 CV-002 Valves Valves Other (Valves) 22 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Valves-163 Mechanical Systems 2020 CV-003 Valves Valves Other (Valves) 22 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Valves-164 Mechanical Systems 2020 CV-004 Valves Valves Other (Valves) 22 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Valves-165 Mechanical Systems 2020 CV-005 Valves Valves Other (Valves) 22 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 12 Low
NBR 11 - Washwater Recovery NBR-Valves-167 Mechanical Systems 2022 HV-009 Valves Valves Other (Valves) 24 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 11 - Washwater Recovery NBR-Valves-168 Mechanical Systems 2022 HV-010 Valves Valves Other (Valves) 24 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 11 - Washwater Recovery NBR-Valves-169 Mechanical Systems 2022 HV-011 Valves Valves Other (Valves) 24 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 3 9 Low
NBR 04 - Pretreatment NBR-Valves-17 Mechanical Systems 1988 HV 417 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 11 - Washwater Recovery NBR-Valves-170 Mechanical Systems 2022 HV-012 Valves Valves Other (Valves) 24 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 4 12 Med-Low
NBR 11 - Washwater Recovery NBR-Valves-171 Mechanical Systems 2022 HV-013 Valves Valves Other (Valves) 24 No Action Required Lack of Redundancy/Potential Reduced
Efficiency 1 4 12 Med-Low

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 11 - Washwater Recovery NBR-Valves-172 Mechanical Systems 1988 HV-014 Valves Valves Other (Valves) -10 Rehabilitation Process/Facility Cannot Operate Without 2 9 54 High NBR 11 - Washwater Recovery NBR-Valves-173 Mechanical Systems 1988 HV-015 Valves Valves Other (Valves) -10 Rehabilitation Process/Facility Cannot Operate Without 2 9 54 High NBR 11 - Washwater Recovery NBR-Valves-174 Mechanical Systems 1988 HV-016 Valves Valves Other (Valves) -10 Rehabilitation Process/Facility Cannot Operate Without 2 9 54 High NBR 12 - Drying Beds / Pump Stations NBR-Valves-175 Mechanical Systems 1988 HV-001 INFLUENT VALVE #1 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-176 Mechanical Systems 1988 HV-001A EFFLUENT VALVE #1 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-177 Mechanical Systems 1988 HV-002 INFLUENT VALVE #2 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-178 Mechanical Systems 1988 HV-002A EFFLUENT VALVE #2 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-179 Mechanical Systems 1988 HV-003A EFFLUENT VALVE #3 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 04 - Pretreatment NBR-Valves-18 Mechanical Systems 1988 HV 418 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 12 - Drying Beds / Pump Stations NBR-Valves-180 Mechanical Systems 1988 HV-003 INFLUENT VALVE #3 Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-181 Mechanical Systems 2011 HV-004 INFLUENT VALVE #4 Valves Other (Valves) 13 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-182 Mechanical Systems 2011 HV-004A EFFLUENT VALVE #4 Valves Other (Valves) 13 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-183 Mechanical Systems 1988 HV-005A 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-184 Mechanical Systems 1988 HV-006A 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-185 Mechanical Systems 1988 HV-007A 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-186 Mechanical Systems 1988 HV-008A 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-187 Mechanical Systems 1988 HV-005 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-188 Mechanical Systems 1988 HV-006 6" Valves Valves Other (Valves) -10 Rehabilitation Lack of Redundancy/Potential Reduced
Efficiency 2 4 24 Med-Low
NBR 12 - Drying Beds / Pump Stations NBR-Valves-189 Mechanical Systems 1988 HV-17/18 6" Valves Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 4 28 Med-Low
NBR 04 - Pretreatment NBR-Valves-19 Mechanical Systems 1988 HV 419 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 02A - Raw Water - PSC NBR-Valves-2 Mechanical Systems 1988 FV-202B 54" PSC VALVE Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 04 - Pretreatment NBR-Valves-20 Mechanical Systems 1988 HV 420 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-21 Mechanical Systems 1988 HV 421 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-22 Mechanical Systems 1988 HV 422 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-23 Mechanical Systems 1988 HV 423 10" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-24 Mechanical Systems 1988 HV 434 16" Valve Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 2 5 35 Medium
NBR 04 - Pretreatment NBR-Valves-25 Mechanical Systems 1988 HV 403 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-26 Mechanical Systems 1988 HV 404 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-27 Mechanical Systems 1988 HV 405 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-28 Mechanical Systems 1988 HV 406 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-29 Mechanical Systems 1988 HV 407 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 02B - Raw Water - NBA NBR-Valves-3 Mechanical Systems 2020 FV-203A 24" FLOW VALVE, NBA Valves Flow Control 17 No Action Required Process/Facility Cannot Operate Without 2 9 27 High NBR 04 - Pretreatment NBR-Valves-30 Mechanical Systems 1988 HV 408 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-31 Mechanical Systems 1988 HV 409 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-32 Mechanical Systems 1988 HV 410 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-33 Mechanical Systems 1988 HV 411 30" Valves Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 5 8 56 High
NBR 04 - Pretreatment NBR-Valves-34 Mechanical Systems 1988 HV-424 8" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-35 Mechanical Systems 1988 HV-425 8" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-36 Mechanical Systems 1988 HV-426 8" Valve Valves Other (Valves) -10 Replace or Run to
Failure Reduced Capacity/Pressure 2 8 56 High
NBR 04 - Pretreatment NBR-Valves-37 Mechanical Systems 2018 HV-427 8" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 1 9 36 High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 04 - Pretreatment NBR-Valves-38 Mechanical Systems 2018 HV-428 8" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 1 9 36 High NBR 04 - Pretreatment NBR-Valves-39 Mechanical Systems 2018 HV-429 8" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 1 9 36 High NBR 02B - Raw Water - NBA NBR-Valves-4 Mechanical Systems 2020 FV-203B 42" FLOW VALVE, NBA Valves Flow Control 17 No Action Required Process/Facility Cannot Operate Without 2 9 27 High NBR 04 - Pretreatment NBR-Valves-40 Mechanical Systems 2018 HV-430 8" Valve Valves Other (Valves) 20 No Action Required Process/Facility Cannot Operate Without 1 9 36 High NBR 04 - Pretreatment NBR-Valves-41 Mechanical Systems 1988 FV-401 SED BASIN #1 TELESCOPING VALVE Valves Other (Valves) -10 Increased
Maintenance Reduced Efficiency 2 7 35 Med-High
NBR 04 - Pretreatment NBR-Valves-42 Mechanical Systems 1988 FV-402 SED BASIN #2 TELESCOPING VALVE Valves Other (Valves) -10 Increased
Maintenance Reduced Efficiency 2 7 35 Med-High
NBR 04 - Pretreatment NBR-Valves-43 Mechanical Systems 1988 FV-403 SED BASIN #3 TELESCOPING VALVE Valves Other (Valves) -10 Increased
Maintenance Reduced Efficiency 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-44 Mechanical Systems 2011 FV- 503 16" Valve Valves Other (Valves) 13 Increased
Maintenance Reduced Efficiency 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-45 Mechanical Systems 2011 FV- 504 16" Valve Valves Other (Valves) 13 Increased
Maintenance Reduced Efficiency 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-46 Mechanical Systems 2011 FV- 505 30" Valves Other (Valves) 13 Increased
Maintenance Process/Facility Cannot Operate Without 4 9 45 High NBR 05 - Filters NBR-Valves-47 Mechanical Systems 1988 HV-501 54" Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 05 - Filters NBR-Valves-48 Mechanical Systems 1988 HV-502 54" Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 5 9 63 High NBR 05 - Filters NBR-Valves-49 Mechanical Systems 2012 FV-515 AIR SCOUR VALVE FILTER #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 02B - Raw Water - NBA NBR-Valves-5 Mechanical Systems 2023 FV-207 54" GUARD VALVE Valves Other (Valves) 25 No Action Required Process/Facility Cannot Operate Without 2 9 27 High NBR 05 - Filters NBR-Valves-50 Mechanical Systems 2010 FV-525 AIR SCOUR VALVE FILTER #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-51 Mechanical Systems 2010 FV-535 AIR SCOUR VALVE FILTER #3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-52 Mechanical Systems 2011 FV-545 AIR SCOUR VALVE FILTER #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-53 Mechanical Systems 2014 FV-555 AIR SCOUR VALVE FILTER #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 1 7 28 Med-High NBR 05 - Filters NBR-Valves-54 Mechanical Systems 2010 FV-565 AIR SCOUR VALVE FILTER #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-55 Mechanical Systems 2013 FV-575 AIR SCOUR VALVE FILTER #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-56 Mechanical Systems 2010 FV-585 AIR SCOUR VALVE FILTER #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 2 7 35 Med-High
NBR 05 - Filters NBR-Valves-57 Mechanical Systems 2011 FV-543 B/W VALVE #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-58 Mechanical Systems 2010 FV-563 B/W VALVE #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-59 Mechanical Systems 2012 FV-513 B/WASH VALVE #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 03 - Pre-Ozone NBR-Valves-6 Mechanical Systems 2020 HV- 205 54" Valve Valves Other (Valves) 22 No Action Required Process/Facility Cannot Operate Without 3 9 36 High NBR 05 - Filters NBR-Valves-60 Mechanical Systems 2010 FV-523 B/WASH VALVE #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-61 Mechanical Systems 2010 FV-533 B/WASH VALVE #3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-62 Mechanical Systems 2014 FV-553 B/WASH VALVE #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 05 - Filters NBR-Valves-63 Mechanical Systems 2013 FV-573 B/WASH VALVE #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-64 Mechanical Systems 2010 FV-583 B/WASH VALVE #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-65 Mechanical Systems 2010 FV-532 EEFLUENT VALVE FILTER # 3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-66 Mechanical Systems 2012 FV-512 EFFLUENT VALVE #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-67 Mechanical Systems 2010 FV-522 EFFLUENT VALVE #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-68 Mechanical Systems 2011 FV-542 EFFLUENT VALVE #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-69 Mechanical Systems 2014 FV-552 EFFLUENT VALVE #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 03 - Pre-Ozone NBR-Valves-7 Mechanical Systems 2020 HV- 206 54" Valve Valves Other (Valves) 22 No Action Required Process/Facility Cannot Operate Without 3 9 36 High NBR 05 - Filters NBR-Valves-70 Mechanical Systems 2010 FV-562 EFFLUENT VALVE #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-71 Mechanical Systems 2013 FV-572 EFFLUENT VALVE #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-72 Mechanical Systems 2010 FV-582 EFFLUENT VALVE #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-73 Mechanical Systems 2012 FV-516 FTW VALVE #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-74 Mechanical Systems 2010 FV-526 FTW VALVE #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-75 Mechanical Systems 2010 FV-536 FTW VALVE #3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23

NBRWTP ASSET RISK ASSESSMENT RESULTS
FacilityCode Process Area Asset Name Discipline Install Year City Asset ID Asset Description Class Subclass Remaining Useful
Life (Years) Action Plan Consequence on Operating Ability LOF COF Risk Score Risk Level NBR 05 - Filters NBR-Valves-76 Mechanical Systems 2011 FV-546 FTW VALVE #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-77 Mechanical Systems 2014 FV-556 FTW VALVE #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 05 - Filters NBR-Valves-78 Mechanical Systems 2010 FV-566 FTW VALVE #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-79 Mechanical Systems 2013 FV-576 FTW VALVE #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 03 - Pre-Ozone NBR-Valves-8 Mechanical Systems 1988 FV-301 INFLUENT VALVE, NORTH PRE-OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 6 42 Med-High
NBR 05 - Filters NBR-Valves-80 Mechanical Systems 2010 FV-586 FTW VALVE #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-81 Mechanical Systems 2012 FV-517 INFLUENT VALVE #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-82 Mechanical Systems 2010 FV-537 INFLUENT VALVE #3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-83 Mechanical Systems 2011 FV-547 INFLUENT VALVE #4 Valves Other (Valves) 13 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-84 Mechanical Systems 2014 FV-557 INFLUENT VALVE #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 05 - Filters NBR-Valves-85 Mechanical Systems 2010 FV-567 INFLUENT VALVE #6 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-86 Mechanical Systems 2013 FV-577 INFLUENT VALVE #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-87 Mechanical Systems 2010 FV-587 INFLUENT VALVE #8 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-88 Mechanical Systems 2010 FV-527 INFLUENT VALVE FILTER #2 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-89 Mechanical Systems 1988 HV-510 Settle Water Conduit Flushing Valve Valves Other (Valves) -10 Replace or Run to
Failure
Process/Facility Operates Normally
Without 2 3 21 Low
NBR 03 - Pre-Ozone NBR-Valves-9 Mechanical Systems 1988 FV-302 INFLUENT VALVE, SOUTH PRE-OZONE CONTACTOR Valves Other (Valves) -10 Replace or Run to
Failure
Lack of Redundancy/Potential Reduced
Efficiency 5 6 42 Med-High
NBR 05 - Filters NBR-Valves-90 Mechanical Systems 1998 508 A Valve Valves Other (Valves) 0 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-91 Mechanical Systems 1998 508 B Valve Valves Other (Valves) 0 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-92 Mechanical Systems 1998 508 C Valve Valves Other (Valves) 0 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-93 Mechanical Systems 1988 HV-507 A Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-94 Mechanical Systems 1988 HV-507 B Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-95 Mechanical Systems 1988 HV-507 C Valve Valves Other (Valves) -10 Replace or Run to
Failure Process/Facility Cannot Operate Without 2 9 63 High NBR 05 - Filters NBR-Valves-96 Mechanical Systems 2014 FV-554 WASATE WATER VALVE FILTER #5 Valves Other (Valves) 16 No Action Required Reduced Capacity/Pressure 3 7 28 Med-High NBR 05 - Filters NBR-Valves-97 Mechanical Systems 2012 FV-514 Waste Water Valve for Filter #1 Valves Other (Valves) 14 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-98 Mechanical Systems 2010 FV-534 Waste Water Va;ve fpr Filter #3 Valves Other (Valves) 12 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High
NBR 05 - Filters NBR-Valves-99 Mechanical Systems 2013 FV-574 WASTE WATER VALVE FILTER #7 Valves Other (Valves) 15 Increased
Maintenance Reduced Capacity/Pressure 4 7 35 Med-High

Clity of Fairfield
Utility Master Plan
Last Revised: 08-28-23
Waterman WTP Condition Assessment, Performance
Evaluation, and Expansion Analysis
Appendix D
C
2020 Research Park Drive
Suite 100
Davis CA 95618
530.756.5905 phone
530.756.5991 fax
westyost.com
TECHNICAL MEMORANDUM – TM2
DATE: May 24, 2024 Project No.: 268-60-22-20
SENT VIA: EMAIL
TO: Mike Hether
CC: Brandan Hiltman
Stuart Hamilton
FROM: Andy Smith, PE, RCE #74673
Whitney Sandelin, PE, RCE #86703
Craig Thompson, PE, RCE #44224
REVIEWED BY: Tim Banyai, PE, RCE #60715
Elizabeth Drayer, PE, RCE #46872
SUBJECT: Waterman WTP Condition Assessment, Performance Evaluation, and Expansion Analysis The purpose of this technical memorandum (TM) is to present the results of a detailed assessment of the Waterman Water Treatment Plant (WTP). The Waterman WTP is owned and operated by the City of Fairfield (Fairfield) and is located within City limits at 2900 Vista Grande. The facility was originally constructed in 1974 and has been renovated several times, with the latest expansion/modernization project completed in 2010.

This document is being prepared as part of the City of Fairfield Public Utility Master Plan (Master Plan) currently in progress. The major topics addressed in this TM include:
• Summary of Existing Facilities
• Fairfield Demand Projections
• Water Quality Characterization and Performance Assessment • Emerging Regulations
• On-Site Condition Assessment
• Risk Assessment
• Capacity Rehabilitation Recommendations
• Plant Expansion Elements
• Hydraulic Capacity Evaluation
• Recommended Capital Improvements
TM – City of Fairfield
May 24, 2024

N-C-268-60-22-20-WP-R-WMP-TM2
Considering its age, the Waterman WTP is in good condition and many elements have been replaced or upgraded. Considering the overall good condition of the facility, this TM focuses primarily on the elements of the Waterman WTP that may require attention.

SUMMARY OF EXISTING FACILITIES
The nominal treatment capacity of Waterman WTP is 30 million gallons per day (mgd); however, a TM issued by Coastland DCCM in October 2023 titled “Revised Recommendations or Firm Capacity for Water Treatment Plants for 2023 Fairfield Water System Master Plan” (Coastland TM) concluded that due to the age and other factors, the current maximum reliable treatment capacity of the NBRWTP is approximately 25 mgd. Subsequently, Fairfield staff have agreed that efforts are necessary to rehabilitate or replace existing facilities, as appropriate, to bring the current maximum reliable treatment capacity of the Waterman WTP back up to 30 mgd. These efforts are described in detail below in the section titled Capacity Rehabilitation Recommendations.

The Waterman WTP treats Solano Project water from the Putah South Canal (PSC), which originates from Lake Berryessa via Lake Solano. The PSC water is then treated through a combination of chemical addition, coagulation/flocculation/sedimentation, intermediate ozonation, filtration, and final disinfection.

Treatment residuals generated by the process are thickened in clarifiers and dewatered in sludge lagoons.

A schematic of the Waterman WTP is shown on Figures 1 and 2.

The major facilities at the Waterman WTP include the following:
• Treatment and Conveyance Facilities
— PSC Intake Structure and Low Lift Pump Station (LLPS) — Pretreatment (Flash Mixing and Actiflo)
— Intermediate Ozone Contactors and Intermediate Chemical Addition (ICA) — Filters
— High Lift Pump Station (HLPS)
— Washwater Equalization Basins
— Recycle Pump Station
— Sludge Clarifiers
— Sludge Lagoons
• Other Structures
— Bulk Chemical Storage Area and Chemical Metering Facility — Operations Building (includes LOX and CO2 Storage, Ozone Generation, Maintenance Basement, and Flash Mixing facilities)
— Blower Building and Zone 3 Pump Station
— Electrical Buildings

CANAL TURN-OUT
TURB
pH
TURB
pH
CL2
SCD
pH
TURB
CL2F
pH
TURB
CL2F TURB SCD pH TURB PC
OZRTURB pH
pH TURB
SHC
SHC
HF
CS
SC
OZ
OZ
CTS
SHC
CS
HF
SC
PEC
PEN
PEC
CS
LA
LA
SCH

SC DRUM SCREENS LOW-LIFT PS CHEMICAL FLASH MIX INFLUENT FLOW METER COAGULATION/SEDIMENTATION

PEA/PEN
CS
LA OZONE CONTACT BASIN INTERMEDIATE CHEMICAL ADDITION VAULT FILTER INFLUENT CHANNEL FILTERS FILTER AIR WASH BLOWER CLEARWELL AND HIGH LIFT PS ZONE 3 PUMP STATION EFFLUENT FLOW METER RESERVOIR M M M M RW SA RW SA SA SLR PO SW SLR SA SA SA SA FI AW FTW SA FWFW PW PWPW PW POST FILTRATION CHEMICAL ADDITION FLASH MIX TREATED WATER TO LAB BACKWASH TO EQ BASINS FILTER TO WASTE TO EQ BASINS FI BACKWASH TO EQ BASINS APPLIED WATER CHANNEL OVERFLOW TO EQ BASINS FILTER INFLUENT WATER TO LAB BACKWASH SUPPLY FROM RESERVOIR TO PLANT UTILITY WATER TODISTRIBUTION SYSTEM BACKWASH SUPPLY TO FILTERS TO DISTRIBUTION SYSTEM TO DISTRIBUTION SYSTEM ACTIFLO WATER TRAIN 2 TO LAB ACTIFLO WATER TRAIN 1 TO LAB ACTIFLO AND OZONE PO TO LOW LIFT PS COAGULATED WATER TO LAB TO SLUDGE CLARIFIERS INFLUENT WATER TO LAB ACTIFLO AND OZONE OVERFLOW/ EQ BASIN DECANT SLUDGE CLARIFIER EFFLUENT CANAL WATER TO LAB N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\26860-2220-FigG-12 - FigG-13.dwg 9/28/2023 11:35 AMovegvary City of Fairfield Waterman WTP Schematic Process Flow Diagram 1 of 2 Figure 1 Water Master Plan CS Caustic Soda CTS Calcium Thiosulfate HF Hydrofluosilicic Acid LA Liquid Alum OZ Ozone PEA Anionic Polymer PEC Cationic Polymer PEN Nonionic Polymer SC Spare Chemical SHC Sodium Hypochlorite LEGEND Chemical Additions AW Filter Air Wash FW Filtered Water FTW Filter-To-Waste PO Plant Overflow PW Potable Water RE Plant Recycled Water RW Raw Water SA Sample SL Sludge SLR Sludge Recirculation SSL Sand Slurry Process Lines CL2 Chlorine Residual F Fluoride ORP Oxidation Reduction Potential OZR Ozone Residual PC Particle Counter pH Hydrogen Ion Concentration SCD Streaming Current Detector TEMP Temperature TURB Turbidity Instrument Legend

M WASHWATER OVERFLOW STRUCTURE

PEC OVERFLOW TO STORM DRAIN FILTER WASTE WASHWATER EQUALIZATION BASINS WASHWATER RECYCLE PUMP STATION SLUDGE CLARIFIER SLUDGE LAGOON BATCH MODE DISCHARGE TO SLUDGE LAGOONS DECANT SLUDGE OVERFLOW DECANT TO LOW LIFT PUMP STATION VIA ACTIFLO OVERFLOW CHANNEL ACTIFLO SLUDGE PO PO RE SL RE RE RE RE SL RE REPO SL SL SL RE RE N:\Clients\268 Fairfield\60-22-20 Water Master Plan\CAD\Figures\26860-2220-FigG-12 - FigG-13.dwg 9/28/2023 11:35 AMovegvary City of Fairfield Waterman WTP Schematic Process Flow Diagram 2 of 2 Figure 2 Water Master Plan CS Caustic Soda CTS Calcium Thiosulfate HF Hydrofluosilicic Acid LA Liquid Alum OZ Ozone PEA Anionic Polymer PEC Cationic Polymer PEN Nonionic Polymer SC Spare Chemical SHC Sodium Hypochlorite LEGEND Chemical Additions AW Filter Air Wash FW Filtered Water FTW Filter-To-Waste PO Plant Overflow PW Potable Water RE Plant Recycled Water RW Raw Water SA Sample SL Sludge SLR Sludge Recirculation SSL Sand Slurry Process Lines CL2 Chlorine Residual F Fluoride ORP Oxidation Reduction Potential OZR Ozone Residual PC Particle Counter pH Hydrogen Ion Concentration SCD Streaming Current Detector TEMP Temperature TURB Turbidity Instrument Legend TM – City of Fairfield
May 24, 2024