Agenda packet, special meeting — Santa Paula City Council, June 17, 2026 (part 3 of 4)

Name of Observer: Jon, Shayne
Pump Station Name: __Terracina No. 1 BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Safety Features:

Fencing and Gates
Alarms (buildings, gates, etc.)
Lighting (standards, wall packs, etc.)
Hatches
Fall Protections (if applicable)
Railing
Ladders
Eye wash (if applicable)
Chemical storage
Slippery surfaces
Cameras
Bollards
Signage
Labeling
Maintenance Issues
Spacing (access for personnel and tools)
Height of instruments
Pipe Supports (sufficiency, location, etc.)
Disassembly Points
Seals Issues (leaks, drains, etc.)
Isolation for each Pumping Unit
Hydro/Air Chamber
Hydro/Air Chamber (isolatable - locking)
Hydro/Air Chamber (compressor)
Backup Power:

Perm. Generator
Generator Plug Panel
Type of fuel
Automatic Transfer Switch
Manual Transfer Switch
Space for Temporary Gen.

Page 2 of 5 ends

Materials (reinforced concrete, metal, etc.)
Exposed Rebar
Lining (in pump well, etc.)
Lighting
HI improvements (fillets, splitters, etc.)
Pump Mounts (cans, sole plates, etc.)
Pump, Elec., Contr. Building (if applic.)
Roof (flat, a-frame, metal, comp.,etc.) Roof in good condition Walls (material)
Interior (ceiling or open, insulation)
Lighting
Doors (type, location, locks, emergency)
Ventilation (fans, AC, etc.)
Coatings:

Pipe coatings-exposed
Valve coatings-exposed
Pipe coatings-vault
Valve coatings-vault
Structure Coatings Coating on building is failing

Page 3 of 5 ends

Level controls (type, location)
Flow meter (make, model, location)
Gauges
Pressure switches
SCADA/Telemtry
Antennae
Alarms (List)
MCC Enclosure-style/condition
Shade structure (Elec.)
Shade structure (Instr.)
Intrusion Alarms
Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Access:

Vehicular
Maint. Equip. (i.e., chem., cranes, etc.)
Surfacing (paved, gravel)
Ponding / Mud
Site Features:

Potable water
On-site Equipment Storage
Restrooms
Lab

Page 4 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __Terracina No. 1 BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
NOTES:

Currently pumps from 400 to 600
May be considered to convert to PRV
Not been used in a while

Page 5 of 5 ends

Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

PUMP STATION VISIT NOTES
LOCATION: Terracina Pump Station 1
DATE: 7/9/2025
STRUCTURE Pump Station

DESCRIPTION
Small CMU building housing pump and electical equipment. Roof is comprised of a wood roof supported on block walls. The pumps are mounted to a concrete pads which sit above the slab on grade.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
SLAB ON GRADE Minor cracking in slab on grade. Generally in good condition.

CMU WALLS
CMU walls show some signs of deterioration. There are some gaps in the head joints particulary in the walls over openings at the gable ends. The walls are not anchored to the roof.

WOOD ROOF The rafters and collar ties appear to be in acceptable condition.

PUMP PADS
The concrete pads that are supporting the pumps are in poor condition exihbiting some spalling.
592
Name of Observer: Jon, Shayne
Pump Station Name: __Terracina No. 2 BPS___________________________________________ Date: 7/9/25 Location (Add Sketch Pg. 5):______________________________________________ Weather:___________________ Personnel:_____________________________________________________________ Surroundings (i.e., enclosure, lawn, street):_________________________________________________________________________ Year Built/Improved:___________________________________________________________________________________________ As-Builts Available: ___________________________________________________________________________________________ Design Capacity:______________________________________________________________________________________________ Pump Maintenance:___________________________________________________________________________________________ Model #:_______________________________________________________________________________________ Serial #:________________________________________________________________________________________ Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Configuration / Pumps:

Style (VT can, VT deck, Horiz., etc.) VT
Pumps (number, capacity, make, model) 3 pumps (1+1 + 1 FIRE) Motors (size hP, make, model) 60 HP x 2 and 200 HP x 1
Series or Parallel Installation Parallel
Pump Location - Outdoor / Indoor Indoor
Electrical & Controls Location
VFDs (1, 2, etc. or all) Fire pump yes
Suction Manifold - above/buried Buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Indiv. Pump Inlet - above/buried Buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Indiv. Pump Discharge - above/buried Above
Size & Material Steel
Height Above/Below Grade 3'
Isolation Valve
Metered
Pump Disch. Manifold - above/buried Above
Size & Material Steel
Height Above/Below Grade 3'
Isolation Valve
Metered
Pump Issues (heat, noise, leaks)
Pump Station Visual Inspection Checklist
2pumps: 425 GPM; 350 TDH; 160 psi observed, 1pump: 1500 GPM; 350 TDH

Page 1 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __Terracina No. 2 BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Safety Features:

Fencing and Gates Pump station is inside brick building Alarms (buildings, gates, etc.) Yes
Lighting (standards, wall packs, etc.) Yes
Hatches Roof hatches to remove pumps
Fall Protections (if applicable)
Railing
Ladders
Eye wash (if applicable)
Chemical storage
Slippery surfaces
Cameras Yes
Bollards
Signage Yes
Labeling Yes
Maintenance Issues
Spacing (access for personnel and tools) Yes
Height of instruments Yes
Pipe Supports (sufficiency, location, etc.) Yes
Disassembly Points
Seals Issues (leaks, drains, etc.)
Isolation for each Pumping Unit Yes
Hydro/Air Chamber
Hydro/Air Chamber (isolatable - locking)
Hydro/Air Chamber (compressor)
Backup Power:

Perm. Generator Yes
Generator Plug Panel
Type of fuel
Automatic Transfer Switch
Manual Transfer Switch
Space for Temporary Gen.

Page 2 of 5 ends

Materials (reinforced concrete, metal, etc.) Reinforced concrete Exposed Rebar
Lining (in pump well, etc.)
Lighting Good
HI improvements (fillets, splitters, etc.)
Pump Mounts (cans, sole plates, etc.)
Pump, Elec., Contr. Building (if applic.)
Roof (flat, a-frame, metal, comp.,etc.)
Walls (material) Brick with sound proofing
Interior (ceiling or open, insulation)
Lighting Good
Doors (type, location, locks, emergency) Good
Ventilation (fans, AC, etc.) Good
Coatings:

Pipe coatings-exposed Good
Valve coatings-exposed Good
Pipe coatings-vault
Valve coatings-vault
Structure Coatings

Page 3 of 5 ends

Vehicular Y
Maint. Equip. (i.e., chem., cranes, etc.)
Surfacing (paved, gravel)
Ponding / Mud
Site Features:

Potable water
On-site Equipment Storage
Restrooms
Lab

Page 4 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __Terracina No. 2 BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
NOTES:

Page 5 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __View Drive BPS___________________________________________ Date: 7/9/25 Location (Add Sketch Pg. 5):______________________________________________ Weather:___________________ Personnel:_____________________________________________________________ Surroundings (i.e., enclosure, lawn, street):_________________________________________________________________________ Year Built/Improved:___________________________________________________________________________________________ As-Builts Available: ___________________________________________________________________________________________ Design Capacity:______________________________________________________________________________________________ Pump Maintenance:___________________________________________________________________________________________ Model #:_______________________________________________________________________________________ Serial #:________________________________________________________________________________________ Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Configuration / Pumps:

Style (VT can, VT deck, Horiz., etc.) Submersible
Pumps (number, capacity, make, model) 1 pump
Motors (size hP, make, model)
Series or Parallel Installation
Pump Location - Outdoor / Indoor
Electrical & Controls Location
VFDs (1, 2, etc. or all)
Suction Manifold - above/buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Indiv. Pump Inlet - above/buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Indiv. Pump Discharge - above/buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Pump Disch. Manifold - above/buried
Size & Material
Height Above/Below Grade
Isolation Valve
Metered
Pump Issues (heat, noise, leaks)
Pump Station Visual Inspection Checklist
Not in use

Page 1 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __View Drive BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Safety Features:

Fencing and Gates Failing Brick walls no barbed wire
Alarms (buildings, gates, etc.) Poor security
Lighting (standards, wall packs, etc.)
Hatches
Fall Protections (if applicable)
Railing
Ladders
Eye wash (if applicable)
Chemical storage
Slippery surfaces
Cameras
Bollards
Signage
Labeling
Maintenance Issues
Spacing (access for personnel and tools)
Height of instruments
Pipe Supports (sufficiency, location, etc.) No pipe supports - Cinderblocks for pipe supports :( Disassembly Points
Seals Issues (leaks, drains, etc.)
Isolation for each Pumping Unit
Hydro/Air Chamber
Hydro/Air Chamber (isolatable - locking)
Hydro/Air Chamber (compressor)
Backup Power:

Perm. Generator Electrical equip was outside
Generator Plug Panel
Type of fuel
Automatic Transfer Switch
Manual Transfer Switch
Space for Temporary Gen.

Page 2 of 5 ends

Materials (reinforced concrete, metal, etc.)
Exposed Rebar
Lining (in pump well, etc.)
Lighting
HI improvements (fillets, splitters, etc.)
Pump Mounts (cans, sole plates, etc.)
Pump, Elec., Contr. Building (if applic.)
Roof (flat, a-frame, metal, comp.,etc.)
Walls (material)
Interior (ceiling or open, insulation)
Lighting
Doors (type, location, locks, emergency)
Ventilation (fans, AC, etc.)
Coatings:

Pipe coatings-exposed Some corrosion
Valve coatings-exposed
Pipe coatings-vault
Valve coatings-vault
Structure Coatings

Page 3 of 5 ends

Level controls (type, location)
Flow meter (make, model, location) 2 electric meters
Gauges
Pressure switches
SCADA/Telemtry
Antennae
Alarms (List)
MCC Enclosure-style/condition
Shade structure (Elec.)
Shade structure (Instr.)
Intrusion Alarms
Item
Exist.
(Y/N)
Oper.
(Y/N) Notes
Access:

Vehicular
Maint. Equip. (i.e., chem., cranes, etc.)
Surfacing (paved, gravel) No drainage
Ponding / Mud
Site Features:

Potable water
On-site Equipment Storage
Restrooms
Lab

Page 4 of 5 ends

Name of Observer: Jon, Shayne
Pump Station Name: __View Drive BPS___________________________________________ Date: 7/9/25 Pump Station Visual Inspection Checklist
NOTES:

Not in service
Francisco wants to convert to PRV
Backfeed for other zone
Neighbor might have used acting wall to mount meter
Pumps from Zone 200 to 400 - but Terracina 2 now pumps from 200 to 600 zones and eliminates need for Glade and View BPS Wants to turn it into a PRV

Page 5 of 5 ends

Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

PUMP STATION VISIT NOTES
LOCATION: View Booster Pump Station
DATE: 7/9/2025
STRUCTURE Pump Station

DESCRIPTION
CMU enclosure housing pump. Inside the enclosure is a slab on grade. The enclosure is accessed with a swinging gate.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
SLAB ON GRADE Minor cracking in slab on grade. Generally OK condition. Grass is growing in the joint between the CMU and slab on grade.

CMU WALLS
Some large cracks have formed in the south and east walls along the mortar joints. The walls are in poor condition and require remediation. A tree has started growing through the south-west corner of the block wall and requires removal.

ELECTRICAL EQUIPMENT

SUPPORT
The electrical equipment is mounted to the south wall which requires remediation.

PIPE SUPPORTS
The pipes are supported on CMU and wood blocks. It is recommended to get steel pipe supports and replace the temporary blocks.\
603

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
FACILITY AND REVIEWING INFORMATIONDate/Time of Assessment: 7/9/2025Site Name/ Facility ID: Well 1-BSite Address: Assessor Name: JH/SCGENERAL INFORMATION FIELD DATA REVIEWER COMMENTSDate Drilled Status Standby Well produces rocks and sand. Used on East side of town. New wells are planned. Well is not used much due to the rocks and sand and may not be needed in future.

As-builts available? Yes/NoWell Depth (ft)Casing Diameter (in)Casing MaterialScreen TypeScreen MaterialPermanent Standby Generator Yes/NoPortable Generator Power Receptacle Yes/NoSite Piping Steel Coating is ok, Bollards present. 10" diameter pipe.SECURITY FIELD DATA REVIEWER COMMENTSFencing Yes Fencing presentSecurity system, gate or intrusion alarm

GENERAL

Page 1 ends

604

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
SITE ACCESS/FEATURES FIELD DATA REVIEWER COMMENTSSite Grading GoodSite Access (Road, Gates, etc.) GoodSurface Improvements (landscape, bollards, etc.) GoodSTRUCTURAL EVALUATION FIELD DATA REVIEWER COMMENTSRoofExterior WallsInterior WallsFloor/SlabWindows/OpeningsDoorsPipe SupportsLarge Equipment Anchorage (Generators, Pumps, etc.)Platforms (if present)

PUMP CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Pump TypePump ManufacturerPump Model #Impeller CodePump Serial #Number of StagesIssues? Pump not bolted down

STRUCTURES

MECHANICAL

Page 2 ends

605

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
PUMP PERFORMANCE FLOW FIELD DATA REVIEWER COMMENTSDesign Flowrate (gpm) 1200 GPMObserved Flowrate (gpm)Discharge Pressure (PSI) 100psi+ (observed)MOTOR CHARACTERISTICS FIELD DATA REVIEWER COMMENTSMotor Type Model #Serial/Catalog #Total Horsepower (HP) 150Speed (rpm) 1780Phase/Voltage 3VFD? NoGENERAL FIELD DATA REVIEWER COMMENTSDisinfection/Treatment Chemicals stored in small wooden enclosure, double wall containment is present, eyewash is present. Sodium hypo injection tubing is not double contained and pressurized over 100 psi. Hypo line is exposed at injector. Aquadene is being used for iron manganese removal.

List remote alarmsList local annunciation alarmsManual or automatic transfer switchELECTRICAL SAFETY FIELD DATA REVIEWER COMMENTSArc-flash labeling?

ELECTRICAL/INSTRUMENTATION

Page 3 ends

606

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
ELECTRICAL EVALUATION FIELD DATA REVIEWER COMMENTSLighting YesGenerator (if applicable)Main Electrical Panel Electrical is old. Electrical enclosures are at end of life.CommunicationsPLC ControllerNOTES

Page 4 ends

607
Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

WELL SITE VISIT NOTES
LOCATION: Well 1-B
DATE: 7/9/2025
STRUCTURE Sodium Hypochlorite Shed
DESCRIPTION Wood framed walls and roof mounted to a concrete foundation.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION Existing slab has some spalling and damage. No large cracks were observed.

WALLS
Studs appear to be in good shape. Siding and trim is in need of paint and repair where there is some wood rot and termite damage.

ROOF Roof framing condition is fair.

STRUCTURE Electrical Cabinet

DESCRIPTION
The electrical cabinet is mounted to a 43-inch by 20-inch concrete pad. The cabinet is anchored with four 1/2-inch anchor bolts. Embedment is unknown. An additional cabinet was mounted to the back of the cabinet on the housekeeping pad and fitted with angles that bear on top of the concrete slab.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION The concrete has some spalling and cracking and generally is not in good condition.

STRUCTURE Pump
DESCRIPTION The pump is mounted to a 47-inch by 47-inch concrete pad.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION The concrete has some spalling and cracking and generally is in OK condition.

Anchors for the pump were not visible.
608

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
FACILITY AND REVIEWING INFORMATIONDate/Time of Assessment: 7/9/2025Site Name/ Facility ID: Well 11Site Address: Assessor Name: JH/SCGENERAL INFORMATION FIELD DATA REVIEWER COMMENTS Date Drilled Status ActiveAs-builts available? Yes/NoWell Depth (ft)Casing Diameter (in)Casing MaterialScreen TypeScreen MaterialPermanent Standby Generator Yes/NoPortable Generator Power Receptacle Yes/NoSite Piping Steel Minor corrosion, pipe supports not bolted/moderate corrosion. Pipe coatings mediocre/poor.SECURITY FIELD DATA REVIEWER COMMENTSFencing Poor Poor fencing. Roller gate is broken, barbed wire is broken.Security system, gate or intrusion alarm Need bollards to protect fence. Hypochlorite building not very secure - AC goes up side of wall and the roots are rotting. Weeds coming through AC.

GENERAL

Page 1 ends

609

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025

SITE ACCESS/FEATURES FIELD DATA REVIEWER COMMENTS
Site Grading Poor surface drainage, needs repaving.Site Access (Road, Gates, etc.)Surface Improvements (landscape, bollards, etc.)STRUCTURAL EVALUATION FIELD DATA REVIEWER COMMENTSRoofExterior WallsInterior WallsFloor/SlabWindows/OpeningsDoorsPipe Supports Not bolted or touching pipe.Large Equipment Anchorage (Generators, Pumps, etc.)Platforms (if present)

PUMP CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Pump Type Pump is oldPump ManufacturerPump Model #Impeller CodePump Serial #Number of StagesIssues? Motor not bolted down.

STRUCTURES

MECHANICAL

Page 2 ends

610

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025

PUMP PERFORMANCE FLOW FIELD DATA REVIEWER COMMENTS
Design Flowrate (gpm) 1200 GPMObserved Flowrate (gpm)Discharge Pressure (PSI) 444' TDH 105 psi observed

MOTOR CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Motor Type Model #Serial/Catalog #Total Horsepower (HP) 150Speed (rpm) 1775Phase/VoltageVFD?GENERAL FIELD DATA REVIEWER COMMENTSDisinfection/Treatment Exposed sodium hypochlorite tubing, containment conduit not secure. Surface drainage not adequate. List remote alarmsList local annunciation alarmsManual or automatic transfer switchELECTRICAL SAFETY FIELD DATA REVIEWER COMMENTSArc-flash labeling?

ELECTRICAL/INSTRUMENTATION

Page 3 ends

611

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025

ELECTRICAL EVALUATION FIELD DATA REVIEWER COMMENTS
LightingGenerator (if applicable) Generator connections could use replacementMain Electrical Panel Electrical appears to be outdated.CommunicationsPLC ControllerNOTES

Page 4 ends

612
Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

WELL SITE VISIT NOTES
LOCATION: Well 11
DATE: 7/9/2025
STRUCTURE Sodium Hypochlorite Shed
DESCRIPTION Prefabricated FRP
AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION Slab not visible as containment is covering the slab. Anchorage not visible. The chemical storage tank is not anchored.

WALLS The walls have some small cracks and deterioration. Condition is generally ROOF Roof has some deterioration.

STRUCTURE Electrical Cabinet

DESCRIPTION
The electrical equipment is mounted to a galvanized steel structure and concrete slab that is flush with the AC pavement.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION The concrete slab is in good condition. The larger cabinets are anchored to the slab with 1/2-inch anchor bolts.

STRUCTURE Pump

DESCRIPTION
The pump is mounted to a 60-inch by 60-inch concrete pad. The cabinet is anchored with four 1/2-inch anchor bolts. Embedment is unknown.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION The concrete is in good condition. The pump is not anchored to the concrete pad. Some corrosion in the pump mounting plate. Some corrosion in the pipe stands.

SITE ELEMENTS
CONDITION ASSESSMENT The rolling gate is not easily opened.

Weeds are growing in the cracks in the pavement and joints between concrete and AC pavement.

Tree outside of the site wall is overgrowing the fence.

Some security wire at the tops of the fences are missing.

The drain into the creek is eroding the creek bank.
613

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
FACILITY AND REVIEWING INFORMATIONDate/Time of Assessment: 7/9/2025Site Name/ Facility ID: Well 12Site Address: Assessor Name: JH/SCGENERAL INFORMATION FIELD DATA REVIEWER COMMENTSDate Drilled 1994Status Active/StandbyAs-builts available? Yes/NoWell Depth (ft)Casing Diameter (in)Casing MaterialScreen TypeScreen MaterialPermanent Standby Generator Yes/NoPortable Generator Power Receptacle Yes/No Portable generator onsiteSite Piping Some coating is poorSECURITY FIELD DATA REVIEWER COMMENTSFencing Brick walls present, no barbed wire.Security system, gate or intrusion alarm Poor live security, signs of grafiti/vandalism.

GENERAL

Page 1 ends

614

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
SITE ACCESS/FEATURES FIELD DATA REVIEWER COMMENTSSite Grading Fair asphaltSite Access (Road, Gates, etc.) Good accessSurface Improvements (landscape, bollards, etc.)STRUCTURAL EVALUATION FIELD DATA REVIEWER COMMENTSRoof Electrical building in poor conditionExterior WallsInterior WallsFloor/SlabWindows/OpeningsDoorsPipe SupportsLarge Equipment Anchorage (Generators, Pumps, etc.)Platforms (if present)

PUMP CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Pump Type VTPump ManufacturerPump Model #Impeller CodePump Serial #Number of StagesIssues?

STRUCTURES

MECHANICAL

Page 2 ends

615

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
PUMP PERFORMANCE FLOW FIELD DATA REVIEWER COMMENTSDesign Flowrate (gpm)Observed Flowrate (gpm) 1300Discharge Pressure (PSI) MOTOR CHARACTERISTICS FIELD DATA REVIEWER COMMENTSMotor Type Model #Serial/Catalog #Total Horsepower (HP) 150Speed (rpm) 1800Phase/Voltage 3VFD?GENERAL FIELD DATA REVIEWER COMMENTSDisinfection/Treatment Sodium Hypochlorite valve should be locked. Broken chemical containment tubing. Containment for hypo seems inadequate.List remote alarmsList local annunciation alarmsManual or automatic transfer switchELECTRICAL SAFETY FIELD DATA REVIEWER COMMENTSArc-flash labeling?

ELECTRICAL/INSTRUMENTATION

Page 3 ends

616

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
ELECTRICAL EVALUATION FIELD DATA REVIEWER COMMENTSLightingGenerator (if applicable) Portable GeneratorMain Electrical PanelCommunicationsPLC ControllerNOTESIron and Manganese ChemicalsElectrical building seems poorUnsecured ball valves on side of tankLevel gauge brokenTank anchoredPavement - fair3 filter + 1 surge - vessels

Page 4 ends

617
Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

WELL SITE VISIT NOTES
LOCATION: Well 12
DATE: 7/9/2025
STRUCTURE Backwash tank (bolted), Treatment plant, Chemical Shed, Site retaining wall

DESCRIPTION
AS-BUILTS AVAILABLE No
TANK
The backwash tank is an AWWA D103 bolted tank built in 1994 by Peabody TecTank. The capacity is 57,200-gallons and is 21-feet diameter and 22-feet tall.

The tank is anchored to the foundation. The foundation type (ring wall vs. mat slab) is unknown.

WELL HEAD AND COVER
The well head is covered by a prefab structure with a wood roof mounted to a concrete slab.

PIPE RACK
The piping is supported on four steel frames. The frames consist of wide flange columns with base plates bolted to the foundation. Connecting the wide flanges and directly supporting the piping is unistrut.

TRUSCO TANK
Beyond the pipe racks are three Trusco Tanks which are on unbraced leg supports. The legs are anchored to the foundation.

CHEMICAL SHED
The chemical shed floor is elevated above grade. Access is by a small stair and catwalk.

SITE
A CMU retaining wall is located on the north side of the site along the side of the highway. The wall is retaining roughly 5-feet of sloping soil. On the other sides of the site are cantilevered CMU site walls.

CONDITION ASSESSMENT
TANK Some cracking in the concrete foundation. Tank shell in good condition. The external ladder is galvanized and in good condition.

WELL HEAD AND COVER
Deterioration in the wood framing. Cracks in well head pedestal. No visible anchorage of the well pump to the pedetal.

PIPE RACK The steel, unistrut, and foundations appear in good condition.

TRUSCO TANK The tanks and anchorage are in good condition.

CHEMICAL SHED
The tanks inside the shed are sitting on grating and are unanchored. The exterior of the shed has some deterioration and corrosion on the fascia.

SITE The CMU retaining wall at the side of the site nearest the highway is in good condition.
618

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
FACILITY AND REVIEWING INFORMATIONDate/Time of Assessment: 7/9/2025Site Name/ Facility ID: Well 13Site Address: 250 Trinity LnAssessor Name: JH/SCGENERAL INFORMATION FIELD DATA REVIEWER COMMENTSDate Drilled Status Standby Alternative for Well 14. Pump only runs on manual, but it should be able to run automated to tank level, but not working. Motor faults after 1 hour.

As-builts available? Yes/NoWell Depth (ft)Casing Diameter (in)Casing MaterialScreen TypeScreen MaterialPermanent Standby Generator NoPortable Generator Power Receptacle NoSite Piping Pipe supports are corroded, piping has minor corrosion. Coating is fair.SECURITY FIELD DATA REVIEWER COMMENTSFencing Adequate fencing, pump stored in brick building. Security system, gate or intrusion alarm Poor/fair security - camera blocked by neighboring palm tree, lots of grafiti on building. Could use vandal proof locks. Vines covering the wall. Need barbed wire fencing.

GENERAL

Page 1 ends

619

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
SITE ACCESS/FEATURES FIELD DATA REVIEWER COMMENTSSite Grading OKSite Access (Road, Gates, etc.) OKSurface Improvements (landscape, bollards, etc.) OKSTRUCTURAL EVALUATION FIELD DATA REVIEWER COMMENTSRoofExterior WallsInterior WallsFloor/SlabWindows/OpeningsDoorsPipe SupportsLarge Equipment Anchorage (Generators, Pumps, etc.)Platforms (if present)

PUMP CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Pump TypePump ManufacturerPump Model #Impeller CodePump Serial #Number of StagesIssues?

STRUCTURES

MECHANICAL

Page 2 ends

620

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
PUMP PERFORMANCE FLOW FIELD DATA REVIEWER COMMENTSDesign Flowrate (gpm) 1800 GPMObserved Flowrate (gpm)Discharge Pressure (PSI) ~100 PSIMOTOR CHARACTERISTICS FIELD DATA REVIEWER COMMENTSMotor Type Model #Serial/Catalog #Total Horsepower (HP)Speed (rpm)Phase/VoltageVFD?GENERAL FIELD DATA REVIEWER COMMENTSDisinfection/Treatment Unprotected chem tubing, chem storage building grate is not rigid, exhaust fan in sodium hypo building appears to be broken. Coated walls in good condition. 200 gallon hypo tank. Exhaust fan not working.List remote alarmsList local annunciation alarmsManual or automatic transfer switchELECTRICAL SAFETY FIELD DATA REVIEWER COMMENTSArc-flash labeling?

ELECTRICAL/INSTRUMENTATION

Page 3 ends

621

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
ELECTRICAL EVALUATION FIELD DATA REVIEWER COMMENTSLighting OKGenerator (if applicable)Main Electrical PanelCommunicationsPLC ControllerNOTESTurn tremie tube elbow down

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622
Project: City of Santa Paula Water Master Plan
Project No.: 2025-0064
Engineer: MEP/JMK

WELL SITE VISIT NOTES
LOCATION: Well 13
DATE: 7/9/2025
STRUCTURE CMU Chemical Storage, Electrical Room, and Pump Room

DESCRIPTION
The structure housing the chemical storage, electrical equipment, and pump is a

12.67-feet building with exterior and interior CMU walls. The roof framing over the electrical and chemical storage rooms was not visible. The roof over the pump room has a steel framed roof that is removeable.

AS-BUILTS AVAILABLE No

CONDITION ASSESSMENT
FOUNDATION Generally the slab is in good condition. There are some small cracks.

WALLS
The CMU walls are in good condition. There are some minor cracks in the exterior wall near the large opening at the pump room. Some graffiti was sprayed on the large door into the pump room.

ROOF The roof framing was not visible.

CHEMICAL STORAGE ROOM
The chemical storage room smelled strongly of sodium hypochlorite. The exhaust fan did not appear to be functioning during the site visit.

ELECTRICAL ROOM The wall in the electrical room had some efflorescence.

PUMP ROOM
The 50-inch square pad supporting the pump has some large cracks. The pump was anchored. The fascia on the removeable roof has some rot and damage.

PIPING AND PIPE SUPPORTS The piping and supports have minor corrosion and coating failure.

SITE ELEMENTS
CONDITION ASSESSMENT The neighbor's ivy is growing over the CMU site wall 623

CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
FACILITY AND REVIEWING INFORMATIONDate/Time of Assessment: 7/9/2025Site Name/ Facility ID: Well 14/Treatment BuildingSite Address: 532 W Main StAssessor Name: JH/SCGENERAL INFORMATION FIELD DATA REVIEWER COMMENTSDate Drilled Status ActiveAs-builts available? Yes/NoWell Depth (ft)Casing Diameter (in)Casing MaterialScreen TypeScreen MaterialPermanent Standby Generator NoPortable Generator Power Receptacle YesSite Piping Steel Coating is worn for well, ok in the treatment buildingSECURITY FIELD DATA REVIEWER COMMENTSFencing Infrastructure is enclosed in building.Security system, gate or intrusion alarm Infrastructure is enclosed in building.

GENERAL

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CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
SITE ACCESS/FEATURES FIELD DATA REVIEWER COMMENTSSite GradingSite Access (Road, Gates, etc.)Surface Improvements (landscape, bollards, etc.)STRUCTURAL EVALUATION FIELD DATA REVIEWER COMMENTSRoofExterior Walls Hole in wall is for generator cable.Interior Walls Sound damping material on walls.Floor/SlabWindows/OpeningsDoorsPipe SupportsLarge Equipment Anchorage (Generators, Pumps, etc.) Pump is not bolted.Platforms (if present)

PUMP CHARACTERISTICS FIELD DATA REVIEWER COMMENTS
Pump TypePump ManufacturerPump Model #Impeller CodePump Serial #Number of Stages Pump appears to be worn. Operates at appropriate flow rate of 3,200 GPM, but significantly lower TDH than rated.Issues? Electrical is in the same room as water. Seal is leaking. Pump does not appear bolted.

STRUCTURES

MECHANICAL

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CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
PUMP PERFORMANCE FLOW FIELD DATA REVIEWER COMMENTSDesign Flowrate (gpm) 3200Observed Flowrate (gpm) 3200Discharge Pressure (PSI) 412' (~231' observed) - pump may be worn or trimmed impellersMOTOR CHARACTERISTICS FIELD DATA REVIEWER COMMENTSMotor Type VTModel #Serial/Catalog #Total Horsepower (HP) 500Speed (rpm) 1795Phase/Voltage 3/460VFD? YesGENERAL FIELD DATA REVIEWER COMMENTSDisinfection/TreatmentList remote alarmsList local annunciation alarmsManual or automatic transfer switchELECTRICAL SAFETY FIELD DATA REVIEWER COMMENTSArc-flash labeling?

ELECTRICAL/INSTRUMENTATION

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CITY OF SANTA PAULA

WELL CONDITION ASSESSMENT FORM
REV. Date 11/12/2025
ELECTRICAL EVALUATION FIELD DATA REVIEWER COMMENTSLightingGenerator (if applicable) Portable generator on-site, planned future permanent generator. Hole in walll for the generator cable.Main Electrical PanelCommunicationsPLC ControllerNOTESCorrosion and cracking on flex couplings in the treatment building, vessel coatings at hatches is poor, general clutter throughout treatment building, grating in treatment building needs to be fixed - tripping hazard. Backwash @ 50 hours to sumpGenerally good condition.AC was recently built.

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Appendix C
Tank Maintenance Matrix and Dive Inspection Reports
DRAFT 628
Tank Name Origin District
Last
Dive
Year
Next
Dive
Overall
Condition
Rank
Interior
Priority
Exterior
Priority
Interior
Scope
Exterior
Scope
Year
Built Capacity Dia. Height
Interior
Relining
Estimated
Cost
Exterior
Paint
Estimated
Cost*
Current Dive Report
1 Anderson Santa Paula 2025 2030 30 1 3 Reline R/R 1980's 0.62 MG 48 42 $200,868 $56,972 Anderson 2 Peck Santa Paula 2025 2030 40 1 5 Reline NW 1980's 0.50 MG 60 24 $217,206 $51,433 Peck3 Limoneria Santa Paula 2025 2030 40 2 2 Reline R/R 1950's 1MG 60 36 $257,901 $67,259 Limoneria4 Case Santa Paula 2025 2030 85 4 5 Reline S/OC 1968 0.50 MG 60 24 $217,206 $51,433 Case5 Cherry Hill Santa Paula 2025 2030 85 4 5 Reline S/OC 1954 0.53 MG 66 21 $242,676 $54,401 Cherry Hill6 Fuchsia Santa Paula 2025 2030 100 5 5 Reline S 1955 0.50 MG 60 24 $217,206 $15,000 Fuchsia Priority 1 – NWPriority 2 – SPriority 3 – OCPriority 4 – S/OCPriority 5 – R/L WarRep - Warranty Repairs Required R/R
Work required as soon as possible
Work required in 1-3 yearsWork required in 3-5 yearsWork required in 5-7 years No work required for 7-10+ years
Remove and Replace
Tank Maintenance Plan
City of Santa Paula
Prioritization Key Abbreviation Legend
No work required (Priority 5)Spot RepairOvercoatSpot Repair & OvercoatNext dive will be a warranty 629

P. O. Box 801357
Santa Clarita, CA 91380-2316 Phone: 877.274.2422
Fax: 661.775.7628
www.CSIServices.biz
Providing Quality Technical Services to the Coating Industry Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
October 21, 2025 Via Email: [email protected]
Luis Garcia Office: 805.266.8152
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Subject: Final Report - Maintenance Inspection

Re: Anderson Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
630
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Anderson Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

CSI Services, Inc.
_________________
N. Randy Gordon, PCS
Technical Services Manager October 21, 2025
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
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Final Report - Maintenance Inspection
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MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents
Introduction ..……………………………..………….………… Page 1
Summary….........……………………...………..…….…...…… Page 1
Background........……………………...………..…….…...…… Page 2
Field Evaluation ……………………...………..…….…...…… Page 2
Dive Inspection Video………………...………..…….…...…… Page 5
Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 9
Attachments
- Field Notes
- Exterior Photos
- Interior Photos
- CSI Chart 1 – General Description of Conditions
- CSI Chart 2 – Rust Grade Criteria
- CSI Chart 3 – Corrosion Grade Criteria
- CSI Chart 4 – Coating Chalking Criteria
- CSI Chart 5 – Coating Adhesion Criteria
- CSI Chart 6 – Coating Blistering Criteria
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October 21, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Anderson Reservoir located at 675 N Peck Rd, Santa Paula CA. This report documents the findings of the inspection and services performed.

Any recommendations have been made in accordance with the applicable requirements of American Water Works Association's Standard (AWWA) D102 "Coating Steel Water Storage Tanks," AWWA Standard M42 "Steel Water Storage Tanks," and CSI's experience with evaluating over a thousand water storage facilities. A photo summary and narrated video are also included to document the condition of the tank.

The field-work was completed on August 19, 2023 by a team primarily comprised of Josh Severa, Steven Metcalf and Steven Metcalf Jr. The exterior shell observations were made mostly from grade level, while the exterior of the roof was examined closeup. The interior inspection was carried out with the tank’s water level at approximately 16 feet using special underwater diving equipment and techniques. Steve Metcalf was the site supervisor and Anthony Jackson was the lead diver. Mr. Randy Gordon, Technical Services Manager, reviewed the results of the field data and prepared recommendations for maintenance work. Mr. Gordon has over 35 years of experience through the evaluation of thousands of storage tanks and other industrial structures. He is certified as an SSPC Protective Coating Specialist (PCS) and NACE/SSPC Level 3 Coating Inspector.

Summary
The ~40 year old paint system on the tank is in overall poor condition with widespread and pervasive corrosion at the roof. The exterior paint system is severely weathered and has poor adhesion, making overcoating strategies risky. The existing paint system is believed to be the original system applied and potentially has high concentrations of heavy metals (e.g. lead, chromium, etc.) that will require special precautions to protect the workers and environment when it is disturbed. The paint system should be tested to identify the concentrations of heavy metals before any work takes place.

The original coal tar epoxy and coal tar enamel lining within the tank is in an overall unsatisfactory condition with widespread rust and blistering. The majority of the corrosion is within the MWL elevations of the tank shell and includes dark rust, pitting, exfoliation and the beginning stages of structural loss. The existing conditions dictate that the interior lining system should be removed and replaced within the next year to prevent further metal loss, necessitating the repair or replacement of steel elements when a relining is all that is required at this time.
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Background
The Anderson Reservoir is a Welded Steel on grade structure that was constructed in the 1980’s. The tank is approximately 48 feet in diameter by 42 feet high providing a nominal capacity of 620,000 gallons and is located at 675 N Peck Rd, Santa Paula CA.

It is the only tank at this hillside site.

The tank shell has six courses that are connected to a roof with rafters, girders and one center column. The tank has six perimeter roof vents, one center stub vent, one roof hatch, and two shell manways. There is NO interior ladder and one exterior ladder. The exterior ladder has fall protection and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band. There is no internal or external cathodic protection (CP) system associated with this tank. The tank has a mechanical water level indicator.

It is believed that the interior linings are the original coatings applied. The interior steel surfaces, including the roof and roof support members are coated with a coal tar epoxy system while the tank shell, floor, and appurtenances are coated with a hot applied coal tar enamel. The exterior roof, shell, and appurtenances are painted with what appears to be an Alkyd system. The internal roof lap seams are not caulked.

Field Evaluation
The purpose of this survey was to assess the condition of the existing coatings and recommend maintenance coating work, where needed. The evaluation mainly involved visual observations, but also involved various testing procedures. Photographs and video were taken to document the field inspections, and a photo summary and narrated video is included within this report.

For survey purposes, the tank has been segmented into defined areas: exterior roof, exterior shell, interior roof, interior shell, and interior floor. The various appurtenances within each of these areas have also been evaluated. A rating system has been developed to quantify the condition of these various tank areas. Each of the rating criteria is found in the Attachments (Charts 1 through 6).

The condition of the coating systems was rated as being poor, fair, good, or excellent (Chart 1). The extent of any rust defects identified within each of the areas was generally determined using the guidelines set forth in ASTM D610 “Standard Test Method for Evaluating the Degree of Rusting of Painted Steel Surfaces” (Chart 2).

Where applicable, the characteristic or stage of corrosion was determined in 634
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accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Coating adhesion was assessed in accordance with ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test, modified Method A and/or a modified version of ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife” (Chart 5). The modified version of ASTM D6677 was used in areas where destructive testing was not found to be practical. Any blistering that may have been present was rated in accordance with ASTM D714 “Standard Test Method for Evaluating the Degree of Blistering in Paints” (Chart 6), and the paint dry film thickness was measured with a Positector 6000FN3 Type II gage in accordance with the applicable guidelines set forth SSPC PA2. The visual observations and data collected from the various areas of the tank are found in the charts below:

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in poor condition with moderate chalking (ASTM D4214, No. 8). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than ten percent of the overall surface area and rated a 4 in accordance with ASTM D610. At the shell, the exterior paint system is in good condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. The paint thicknesses were found to range from 9.0 to 10.0 mils on the roof and 14.0 to 15.0 mils on the shell. The paint system was estimated to exhibit poor adhesion (ASTM D6677, 3A).

Some of the specific data collected follows:

Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
2222
NE
9 Exterior
9 S
Good
W
9 Tank Support
Exterior Good
Overall Condition
9 Shell Quadrant
88 8 88 8 88 68 8
Paint Defects
Roof Quadrant
SW
Poor
4 Exterior
2 4
2 Exterior Paint
ES
2 E
44 N
2 Fair
22 99
W
99 N
22 8
Delamination
Spot peeling
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Interior
The roof area is defined as those surfaces above the highest water level (HWL). Closeup visual examinations were made to all areas below the waterline and all other areas were assessed from the water level. The coating on the underside of the roof plates and roof support structure is in poor condition with corrosion common to the edges of the support member flanges and roof plates. Spot peeling and cracking was observed throughout, leading to lamellar or exfoliation corrosion (CSI Corrosion Grades 2, 4). The total amount of corrosion on the roof was rated to be approximately 1 percent of the total surface area (ASTM D610, 6), and there was a moderate amount of rust staining present at the upper shell course from the roof, emanating from the faying surfaces at the roof structure.

The shell surfaces are covered with a dark sediment, but spot checking revealed the lining on the shell was found to be in poor condition with areas of dark rust, pitting and lamellar exfoliation (CSI Corrosion Grades 2, 3, 4), especially within the mean water level segment of the shell. The total amount of corrosion on the shell was rated to be one-third of the total surface (ASTM D610, 2) with rust nodules and pitting observed.

Widespread groupings of intact, medium dense blisters were observed (ASTM 714, 4/Dense).

The floor had a large amount of sediment upon it, but spot checks revealed a hot applied enamel system that was estimated to be in good condition, (ASTM D610, 9) with localized large blisters (ASTM 714, 4/Dense).

The data collected from the inspection follows:

Above Water Condition Below Water Condition Good
9 2
9 E
4/Dense
22 Yes
Moderate
4/Dense
2 2,3,4 2,3,4 2,3,4
Yes
2,3,4
6 Minor
2 6
Interior Paint
Interior
2 Moderate Moderate
2 4/Dense
2 Floor Quadrant
SW
Good
Shell Quadrant
Yes
4/Dense
S
Paint Defects/Overall Grade
22 9
Interior
WN
29 WN E N
Poor
E
Poor Interior
66 S
2,4 2,4
Yes
Minor
Roof Quadrant
Moderate
222
4/Dense 4/Dense 4/Dense 4/Dense
2,4
Yes Yes
Poor
2,4
Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
22 Rust areas (ASTM D610)
Rust spots (ASTM D610)
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Dive Inspection Video
Cut and paste the external link: https://photos.app.goo.gl/rADmiKBxCrXi5Xn4A Discussion
The paint system on the exterior was found to be relatively thin and in poor condition on the roof but in good condition on the shell. All surfaces of the roof have isolated spot rust and areas of peeling and the paint system was found to have significantly weathered from chalking. It was also noted that the underside of the vents have heavy corrosion up to and including some metal loss.

Peeling or delaminating coating is a symptom of an adhesion problem between the coating and substrate or from within layers of coating system. Adhesion is a function of a coating system's strength. Peeling is often a result of coated over contamination, incompatibility between coats, or from an undercoat being coated after its recoat window had closed. Catalyzed coatings, such as epoxies and urethanes continue to dry and then cure to a point to where they become too hard for topcoats to chemically adhere. Once the window for a chemical bond is closed, special procedures such as scarification are required to allow for a mechanical bond.

Chalking is the term for the powdery characteristic of an aged coating that may also have a faded finish. Chalking is a result of the natural breakdown of a paint system's binder when it is exposed to sunlight. The binder (or resin) degrades in ultraviolet light, which leaves behind the unbound pigment or chalk. Aside from a faded appearance, chalking can result in corrosion as the film weathers (thins) away through cycles of wind and rain. As the paint endures years of direct sunlight, it begins to weather away, which 637
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results in the paint no longer providing enough barrier protection from corrosion.

Cracking is the result of some form of stress within the coating system that extends through a complete layer of coating. The stress is often a result of some internal coating pressure or from some form of structural movement. The internal pressures can result from a shrinking film when it is applied too thick or if coating a coating does not have the elongation properties required to bridge existing breaks. Checking is related to cracking, but the coating breaks do not extend through the entire system.

Generally speaking, there are four possible approaches to maintenance coating work.

The coatings can be either completely removed and replaced (repainted), spot repaired, spot repaired and overcoated, or simply overcoated. In evaluating the condition of a coating to determine the best approach there are a number of different factors to consider. The first set of factors includes the determination of the coating's ability to withstand the added stress of an additional coat(s). Attributes impacting this decision include film thickness and adhesion. If a film is too thick or has poor adhesion, the tension from the curing stresses and/or the weight of the additional paint can cause the existing system to disbond. The second set of factors to consider when determining what maintenance coating approach to take is the amount of surface area requiring repair, the overall difficulty in providing access to the structure, and whether the coating system contains heavy metals. The final factor is the condition of the substrate.

When considering whether a spot repair approach is a viable option, a good rule of thumb is that up to 10 percent of the surface area requiring repair is the point at which making spot repairs with overcoat becomes a diminishing return. With 10 percent rusting, overcoating may be an option if the adhesion is better than fair. If there is more than 10 percent rusting and the substrate is free of mill scale, overcoating may be considered an option if the adhesion is satisfactory. Once the amount of surface area exceeds this range, the cost of cleaning and coating the individual rust spots approaches (or exceeds) the total cost of removal and replacement.

On this basis, it is recommended that the tank exterior roof paint system be removed and replaced within the next 3 to 5 years before any additional significant metal loss develops. The existing paint system at the shell appears to be a suitable candidate for overcoating strategies, therefore, a spot repair and overcoat could be performed there in conjunction with the work being performed at the roof.

At interior surfaces, the tank lining system was found to have widespread dark corrosion above the highest water level (HWL) with lamellar and/or exfoliation corrosion common to the areas of the shell within the MWL. Some rafter flanges exhibit some minor section loss due to corrosion. A significant amount of corrosion was found below HWL with pitting and medium dense patches of broken and unbroken blisters. 638
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Rust is a result of ferrous metal essentially converting itself back to its original state, iron ore. It takes a tremendous amount of energy to convert an ore into a usable metal.

These metals then try to naturally release this energy through the development of rust.

Corrosion is a more generic term for a condition that has resulted in a substrate that has reacted with its environment. With respect to the stages of the rust or corrosion of steel, the process initiates itself as light-colored orange surface rust. As the corrosion process continues, the rust becomes darker in color until it eventually results in advancing forms of metal loss. Metal loss can take the form of pitting, which is a localized corrosion cell that results in cavities or holes developing in the metal.

Exfoliation corrosion is a form of intergranular corrosion which involves selective attack of a metal at or adjacent to grain boundaries. In this process, corrosion products force metal to move away from the body of the material, giving rise to a layered, laminar appearance. Exfoliation corrosion is also known as layer corrosion or lamellar corrosion.

A tank roof, including its roof support structure has many open, unsealed areas by design. These open areas are primarily at the inaccessible crevices that are between the top of the roof beam flanges and the roof plate. The cost of properly sealing these areas becomes a diminishing return, notably when one considers that small crevice areas often develop into dead-air space. The minor amount of rust staining is simple a result some areas not being completely sealed by coatings.

Since all of the blisters were underwater and below the common water level, it is presumed that the blisters are a result of osmotic forces. Osmotic blistering is typically caused when coatings that are to be placed into immersion service are applied too thick, overcoated too soon, under colder weather conditions, and/or over contaminated surfaces. One form of osmotic blistering is solvent entrapment. Solvents are added to coatings to act as a vehicle during application. When coatings are applied too thick the coating solvents that were designed to be released during application are locked inplace when the catalyzed coating reaches a full chemical cure. Additionally, if coatings are applied under cold or cooler conditions, the solvents have a difficult time escaping from the film before it gets hard. Blisters that result from solvent entrapment tend to be localized to the coolest and lowest areas of a tank. Solvent vapors are typically heavier than air, and the lowest portion of a tank tends to become saturated with these gases without proper ventilation at the time of application. Coated over contamination creates a source for osmotic forces. This contamination attracts fluid that creates pressures that exceed the film's ability to bond, creating blisters.

Isolated corrosion pits can develop within a coating system that may have only a few small breaks that were not corrected through periodic maintenance repairs. If the 639
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remaining, adjacent coating has excellent adhesion, it will inhibit undercutting corrosion.

As a result, the corrosion forces will have a tendency to concentrate on the exposed bare metal, which results in pitting. Pitting can be critical in some instances. The maximum corrosion rate for steel in fresh water is typically no more than 30 mils per year (MPY). As a result, the pitting can develop into a perforation if not repaired. If a thru-hole develops within a tank bottom, the isolated issue can develop into a much larger corrosion problem. Corrosion requires oxygen to advance, and the underside of the tank bottoms are considered a dead-air space. As a result, the bottom of tank floors are typically not coated. A perforation or thru-hole with even a small trickle of water will reintroduce oxygen into the environment creating active corrosion that is difficult to identify until the steel floor plate requires replacement.

Industrial paint systems such as those applied to industrial facilities (i.e. piping, structural steel, storage tanks) typically have a life expectancy of 25 to 35 years before any spot maintenance coating repairs are required. The original coal tar epoxy and hot applied enamel system within the tank cannot be spot repaired and the characteristics of the coating defects indicates that the lining failed many years ago. It is recommended that the lining be removed and replaced within the next 1 to 2 years.

During an earthquake, there is the potential for the tank bottom to move at a different rate than the below grade piping. Past seismic events have resulted in piping connections being sheared or cracked, which resulted in a loss of water capacity during times when it was most needed during the emergency. Retrofitting tank piping to include flexible connections for inlet/outlets is a better design when considering this issue.

The tank ventilation was found to have screening installed with gaps or penetrations. 640
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Recommendations
The following activities are recommended for remedial work:

Exterior
Within the next three to five years, remove and replace the exterior coating. This work should include the following:
1) Remove and replace the exterior paint system. This work should include cleaning all surfaces in accordance with SSPC’s Surface Preparation Standard No. 6, “Commercial Blast Cleaning” (SSPC SP-6) followed by 4- 6 mils of an industrial epoxy primer and 3-5 mils of a polyurethane finish coat.
2) Test the paint system for heavy metals to determine if any special actions are required to protect workers and the environment during paint disturbance.

NOTICE: This report represents the opinion of CSI Services, Inc. This report is issued in conformance with generally acceptable industry practices. While customary precautions were taken to ensure that the information gathered and presented is accurate, complete, and technically correct, it is based on the information, data, time, and materials obtained and does not guarantee a leak proof tank. 641
© Copyright CSI Services 2023
Maintenance Inspection
One Column
Roof Vent Design
Lining Type/Original
Miscellaneous Notes
Round Hood
Construction Co. Unknown No
Yes
One
Roof Tie-Off Present
Polyurethane
Tank Type Potable
N/A
Yes
Gravel
Exterior Vandal Deterrent
At Hatch
Type of Manways
No. Shell Manways
Diameter of Manways
Manway Cover Design
Welded Steel One
Round
Cylinder
Yes
Roof Rail Satisfactory
Height (feet) Roof Rail System
Center Roof Vent Size
Tank Profile
48 42
Roof Vent Sealed
Unknown Rail Location
Data
Unknown (80's)
Item Data
on grade
Overflow Pipe Diameter
Flexible Pipe Coupling
Outlet Diameter
Inlet Diameter
Mixed
Inlet Interior Design
Overflow Design A Lower Funnel Barrier Walls
Capacity (gallons)
Exterior Structural Characteristics
620,000
Lining Type/Original
Item
Epoxy
No
Stub
Connections
Column Base Design
Bolted
Free Plate
Upper Center Column Dollar Plate CP System/Type
Perimeter Fencing
Site secured on arrival
Data
Antenna on Tank
N/A
Item Data
Roof Structure Rafters and Center Column
I Beam
Item
Column Design
No
No
N/A
No. Interior Ladder
Outlet Design
Item
GPS Coordinates
Cross Street
Tank Location
Surrounding Site Dirt
Nearest Structures
N Peck Rd
675 N Peck Rd, Santa Paula CA

34.35073, -119.09437
Water Depth
No
Tank Geometry
Pitched Roof with Drip Ring
No. of Columns
None
16 ft
Phone: 877.274.2422 (toll free)
Fax: 661.755.7628
www.CSIServices.biz
Field Water Tank Dive Inspection Report
Description
Interior Structural Characteristics
Roof Accessible
Overhead Power Lines
N/A
None
P.O. Box 801357, Santa Clarita, CA 91380
Water Agitator
No
Date
1 of
Completed By Metcalf
1 CSI Job No.

Page
240243
08/19/25 Tuesday
Date of Last Inspection
Ladder
20 in
N/A
No
Steven Metcalf
Dive Tender
Dive Leader:

Dive Supervisor:

Steven Metcalf Jr
Josh Servera
Stub
Yes
Yes
Yes
Item Notes
Client Contact:

Tank Owner/Client:

Tank Name:

City of Santa Paula
Andreson
Rob Lepore
Site Information
Diameter (feet) Yes
Number of Courses
Scope
Yes
Tank Type
Contract No.

Erection Year
Roof Design
Height of Each Course
No. Roof Hatches/Location
Size of Roof Hatch
Six
Center
12 in
The information reported was obtained using visual observations and testing believed to be accurate. The information reported represents the data obtained from the specific representative areas inspected, tested, and/or verified. This document shall only be produced in its entirety. 24 in
One
Hatch Design
No. Roof Vents/Location
Shell Inlet and Outlet
20 in 12 in
YEs
Overflow Exterior Design
Drain Location
Water Level Indicator
Tank Foundation
Two Screen Air Gap
N/A
Tank Piping
Ext Ladder Fall Prevent
Ext Ladder Satisfactory
Yes
Yes
No. & Type Roof Access
Yes
Unibolt No
Square Shoe Box
Near Edge
Shell
Caulking Roof No Columns
Two Shell Manways
12 in
642
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© Copyright CSI Services, Inc. 2004
Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected of the paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

General Description of Conditions Rating Maintenance Inspection Warranty Inspection Poor
This condition is usually prioritized for
rework in the short-term. Typically, these
surfaces have considerably more coating
defects and/or corrosion than what is
expected for the age of the system.

This condition identifies an area with
wholesale coating defects or corrosion
concerns that will typically require
significant removal and replacement of
the coatings in the area.

Fair
Typically, these surfaces have a level of
coating defects and/or corrosion that is
slightly worse than what should be
expected for the age of the system. This
condition is placed on a short-term
monitoring schedule.

This condition identifies an area with
partial coating defects or corrosion
concerns that will require significant
rework.

Good
This condition is rated for areas without
any considerable coating defects or
corrosion. These surfaces are in a
condition that is typical for the age of the
coating system.

This condition identifies areas with
coating defects or corrosion that is
typically seen in one-year warranty
inspections. Typically, only minor spot
repairs are required.

Excellent
This condition is for areas without any
considerable coating defects or corrosion.

Typically, these surfaces are in a
condition that is better than expected for
the age of the system.

This condition identified areas that
typically are in perfect condition and
require no repair work.
687
Copyright CSI Services, Inc. 2004
Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust.

Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1 Rust Grade 0
Rust Grade Description
10 No rusting or less than 0.01% of surface rusted
9 Minute rusting, less than 0.03% of surface rusted
8 Few isolated rust spots, less than 0.1% of surface rusted 7 Less than 0.3% of surface rusted
6 Excessive rust spots, but less than1% of surface rusted 5 Rusting to the extent of 3% of surface rusted
4 Rusting to the extent of 10% of surface rusted
3 Approximately one-sixth of the surface rusted
2 Approximately one-third of the surface rusted
1 Approximately one-half of the surface rusted
0 Approximately 100% of the surface rusted
688
© Copyright CSI Services, Inc. 2004
Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

Grade Description Photo Examples
1 Light Rust - This
condition involves
relatively light colored
rust that does not
have any significant
metal loss.
2 Dark Rust -This
condition involves
relatively dark
colored, thicker rust
that is progressing
towards the next
phase, significant
metal loss.
3 Pitting - This
condition involves
isolated or
widespread deep
spot corrosion
(pitting).
4 Scale - Also known
as lamellar or
exfoliation corrosion.

The edges of the
affected area are leaf
like and resemble the
separated pages of a
wetted book.
5 Structural Loss - This
condition involves
metal loss or failure
where components
will require structural
consideration
The photos depicted are examples and were not taken on this project. 689
© Copyright CSI Services, Inc. 2004
Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints
No .8 No. 6 No .4 No. 2

Dark Colored Paints
No .8 No. 6 No .4 No. 2
690
© Copyright CSI Services 2004
Chart 5 - Adhesion Rating The figures below depict the photographic standards and criteria referenced in ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test” and ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife.” Both Standards are used to assess the condition of a paint system for life-cycle projections. It is also used to evaluate an existing paint system’s ability to withstand the added stress that any overcoating strategies can create. Depending upon the thickness of the paint system, ASTM D3359 has two different test methods. The rating criteria for both standards follow:

ASTM D3359
Method A Method B
Rating Observation
Surface of X-cut from
which flaking/peeling has
occurred
Rating Percent Area
Removed
Surface of cross-cut area from
which flaking has occurred for
six parallel cuts and adhesion
range by percent
5A
No peeling or
removal None 5B 0% none
4A
Trace peeling or
removal along
incisions or their
intersection
4B Less than
5%
3A
Jagged Removal
along incisions up
to 1/16” on either
side
3B 5 – 15%
2A
Jagged removal
along most of
incisions up to 1/8”
on either side
2B 15 – 35%
1A
Removal from most
of the area of the X
under the tape 1B 35-65%
0A
Removal beyond
the area of the X 0B Greater than
65%
ASTM D6677
Rating Description
10 Fragments no larger than ” x ” can be removed with difficulty 8 Chips up to ” x ” can be removed with difficulty
6 Chips up to ” x ” can be removed with slight difficulty 4 Chips larger than ” x ” can be removed with slight pressure 2 Once coating removal is initiated by knife, it can be peeled at least ” 0 Coating can be peeled easily to length greater than ” 691
© Copyright CSI Services, Inc. 2004
Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8).

Few Medium Medium Dense Dense
Blister
Size No. 2
Blister
Size No. 4
Blister
Size No. 6
Blister
Size No. 8
692

Re: Case Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
693
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Case Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

Consulting Evaluations Tank Diving Inspection
694
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents

Introduction ..……………………………..………….………… Page 1

Summary….........……………………...………..…….…...…… Page 1
Background........……………………...………..…….…...…… Page 2
Field Evaluation ……………………...………..…….…...…… Page 2
Dive Inspection Video………………...………..…….…...…… Page 5

Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 8

Attachments

- Field Notes
- Exterior Photos
- Interior Photos
- CSI Chart 1 – General Description of Conditions
- CSI Chart 2 – Rust Grade Criteria
- CSI Chart 3 – Corrosion Grade Criteria
- CSI Chart 4 – Coating Chalking Criteria
- CSI Chart 5 – Coating Adhesion Criteria
- CSI Chart 6 – Coating Blistering Criteria

695
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

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October 21, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Case Reservoir located near 8200 Pine Grove Rd, Santa Paula CA. This report documents the findings of the inspection and services performed.

Summary
The paint system on the exterior was found to be relatively thin and in fair condition overall. The exterior surfaces have only isolated spot rust and the paint was found to have significantly weathered from chalking. However, the overall film thickness of the paint system and its general satisfactory adhesion makes it an ideal candidate for future overcoating strategies. Currently, it is recommended that the existing paint system be spot repaired and overcoated within the next 5 to 7 years to prevent further degradation and corrosion.

The 2nd generation aromatic polyurethane hybrid (Likely Polibrid 705) lining within the tank is in an overall fair condition with widespread rust and delaminations, however, the sacrificial anode CP system is preventing more advanced forms of corrosion from developing below the HWL and while the existing lining is nearing the end of its lifespan, the eventual relining project can be postponed for perhaps 4 to 6 years. 696
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

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October 21, 2025
Background
The Case Reservoir is a welded steel on grade structure that was constructed in 1968.

The tank is approximately 60 feet in diameter by 24 feet high providing a nominal capacity of 620,000 gallons and is located at 8200 Pine Grove Rd, Santa Paula CA. It is the only tank at this hillside site.

The tank shell has four courses that are connected to a roof with rafters and one center column. The tank has numerous perimeter roof vents, one center stub vent, one roof hatch, and two shell manways. There is an interior ladder and one exterior ladder. The exterior ladder has fall a protection device and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band. There is an internal sacrificial anode cathodic protection (CP) system associated with this tank. The tank has a mechanical, half-travel, water level indicator and there is a painter’s rail both inside an out, just below the elevation of the roof/shell intersection.

It is believed that the interior lining is a 2nd generation system. The interior steel surfaces, including the roof and roof support members, are coated with a high-build aromatic hybrid polyurethane. The exterior roof, shell, and appurtenances are painted with what appears to be a polyurethane system. The internal roof lap seams are not caulked.

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October 21, 2025
Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
2222
NE
9 Exterior
9 S
Fair
W
9 Tank Support
Exterior Fair
Overall Condition
9 Shell Quadrant
66 6 66 6 66 66 6
Paint Defects
Roof Quadrant
SW
Fair
9 Exterior
2 9
2 Exterior Paint
ES
2 E
99 N
2 Fair
22 99
W
99 N
22 6
Delamination
Spot peeling
Where applicable, the characteristic or stage of corrosion was determined in accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in fair condition with moderate chalking (ASTM D4214, No. 6). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than 0.03 percent of the overall surface area and rated a 9 in accordance with ASTM D610. At the shell, the exterior paint system is in fair condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. The paint thicknesses were found to range from 7.0 to 9.0 mils on the roof and 5.0 to 6.0 mils on the shell. The paint system was estimated to exhibit moderate adhesion (ASTM D6677, 3A) at the shell and satisfactory adhesion (ASTM D6677, 5A) at the roof.

Some of the specific data collected follows:
698
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

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October 21, 2025
Interior
The roof area is defined as those surfaces above the highest water level (HWL). Closeup visual examinations were made to all areas below the waterline and all other areas were assessed from the water level. The coating on the underside of the roof plates and roof support structure is in good condition with corrosion common to the edges of the support member flanges and edges of roof plates. Minor instances of spot peeling and cracking was observed throughout with dark corrosion (CSI Corrosion Grades 2) appearing from undercutting. The total amount of corrosion on the roof was rated to be approximately 0.03 percent of the total surface area (ASTM D610, 9), and there was a minor amount of rust staining present at the upper shell course from the roof, emanating from the faying surfaces at the roof structure.

The shell surfaces are covered with a dark sediment, but spot checking revealed the lining on the shell was found to be in fair condition with areas of dark rust (CSI Corrosion Grades 2), especially within tank accessories and edges. The total amount of corrosion on the shell was rated to be 0.03 percent of the total surface (ASTM D610, 9) with rust nodules and pitting observed. The most prominent defect were areas of full lining release from the substrate. These areas were in close proximity to the upper shell vents and the defects exist in almost all locations, just below these vents. At this juncture, these defects do not appear to expose the substrate to corrosion and are merely very large blisters with intact caps.

The floor had a large amount of sediment upon it, but spot checks revealed the lining at the tank bottom was in good condition, (ASTM D610, 9) with no notable defects.

The data collected from the inspection follows:

Rust areas (ASTM D610)
Rust spots (ASTM D610)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
Moderate
Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Fair
22 Yes Yes
Yes Yes
Roof Quadrant
Yes
99 S
22 Yes
WN E
Fair
E
Good Interior
N
99 Interior
WN
99 Paint Defects/Overall Grade
9 Yes
S
9 Floor Quadrant
SW
Good
Shell Quadrant
Moderate
Interior Paint
Interior
99 2
Yes
2 Yes
Moderate
Yes
Moderate
E
99 Above Water Condition Below Water Condition Good
699
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

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October 21, 2025
Dive Inspection Video
Cut and paste the external link: https://photos.app.goo.gl/e9LSzP2i1tJ5f8PT7 Discussion
In general, the exterior paint system on the tank is aged, relatively thin, and exhibits moderate chalking with satisfactory adhesion between the finish coat and the primer in all areas tested. There are few areas of pinpoint and spot rusting within the paint system upon the roof, primarily at plate depressions where water tends to pond and immerse the paint system for long periods of time. Although the shell surfaces have some isolated spot rust, the paint system was providing general corrosion protection, at this time. The paint will likely continue to provide protection of the steel for a few more years, but it will continue to oxidize and degrade.

Chalking is the term for the powdery characteristic of an aged coating that may also have a faded finish. Chalking is a result of the natural breakdown of a paint system's binder when it is exposed to sunlight. The binder (or resin) degrades in ultraviolet light, which leaves behind the unbound pigment or chalk. Aside from a faded appearance, chalking can result in corrosion as the film weathers (thins) away through cycles of wind and rain. As the paint endures years of direct sunlight, it begins to weather away, which results in the paint no longer providing enough barrier protection from corrosion.

Rust is a result of ferrous metal essentially converting itself back to its original state, iron ore. It takes a tremendous amount of energy to convert an ore into a usable metal.

These metals then try to naturally release this energy through the development of rust.

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October 21, 2025
the process initiates itself as light colored orange surface rust. As the corrosion process continues, the rust becomes darker in color until it eventually results in advancing forms of metal loss. Metal loss can take the form of pitting, which is a localized corrosion cell that results in cavities or holes developing in the metal.

The tank roof has localized areas where atmospheric water tends to collect to develop ponds at plate depressions. The paint applied to the exterior of the tank was not designed for immersion service. As a result, the paint in many of these areas has degraded to form flaking and corrosion.

Generally speaking, there are four possible approaches to maintenance painting. The coatings can be either completely removed and replaced (repainted), spot repaired, spot repaired and overcoated, or simply overcoated. In evaluating the condition of a coating to determine the best painting approach there are a number of different factors to consider. The first set of factors includes the determination of the coating's ability to withstand the added stress of an additional coat(s). Attributes impacting this decision include film thickness and adhesion. If the paint film is too thick or has poor adhesion, the tension from the curing stresses and/or weight of the additional paint can cause the existing system to disbond. The second set of factors to consider when determining what painting approach to take is the amount of surface area requiring repair, the overall difficulty in providing access to the structure, and whether the coating system contains heavy metals (i.e. lead, cadmium, and chromium). The final factor is the condition of the substrate.

When considering whether a spot repair approach is a viable option, a good rule of thumb is that spot repair, with or without overcoat, makes sense with up to 10 percent of the surface area requiring repairs. With more than 10% in disrepair, making spot repairs and overcoating becomes a diminishing return. With 10 percent rusting, overcoating may be an option if the adhesion is better than fair. If there is more than 10 percent rusting and the substrate is free of mill scale, overcoating may be considered an option if the adhesion is excellent. Once the amount of surface area in need of repair exceeds this range, the cost of cleaning and coating the individual rust spots approaches (or exceeds) the total cost of removal and replacement.

On this basis, and due to the satisfactory adhesion observed at the roof and shell, the tank exterior paint should be spot repaired and overcoated within the next 5 to 7 years.

Overall, the tank interior coatings are in good condition in the area above the highest water level (HWL), and in fair condition below the HWL. The lining on the underwater areas of the tank is mostly free of widespread corrosion, but there are localized areas of spot rust, including the beginning stages of exfoliation at irregular surfaces such as the ladder, dollar plate, rafter flanges, shell penetrations for accessories, and rough welds. 701
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

Page 7 ends

October 21, 2025
A tank roof, including its roof support structure has many open, unsealed areas by design. These open areas are primarily at the inaccessible crevices that are between the top of the roof beam flanges and the roof plate. The cost of properly sealing these areas becomes a diminishing return, notably when one considers that small crevice areas often develop into dead-air space. The minor amount of rust staining is simply a result of some areas not being completely sealed by coatings.

The design and fabrication of a water storage tank is critical relative to the performance of the lining. For instance, tank and vessel internal surfaces to be lined should not be marred by gouges, handling marks, deep scratches, metal stamp marks, slivered steel, or other surface flaws. All rough welds should be ground to remove sharp edges and weld spatter removed. Flaws should be repaired by welding or grinding, as appropriate.

The corrosion at edges is likely simply a result of the coating not having enough barrier protection at the edges. All coatings tend to thin at edges, which often results in these locations showing signs of rust years before the barrier protection breaks down on flat surfaces. Surface tension results in coatings separating away from edges as they are applied. It is not clear if the installation of the coating system involved special brush work at the roof edges (i.e. strip coat), but strip coating would have helped prevent this type of defect.

The tank ventilation was found to have screening installed without gaps or penetrations. 702
Final Report - Maintenance Inspection
City of Santa Paula – Case Reservoir
MKN Associates

Page 8 ends

October 21, 2025
Recommendations
The following activities are recommended for remedial work:

Exterior:
1) No coatings work is required at this time. Plan on a future spot repair and overcoat of the paint system in conjunction with the future relining to best amortize costs.

Interior:
2) Within the next 4 to 6 years, remove and replace the lining system. a) This work should include abrasive blast cleaning all surfaces to SSPC SP10, “Near White Blast Cleaning” followed by three coats of an ANSI/NSF certified epoxy at 4 to 6 mils per coat.
b) Consider removal of the interior painter’s rail for a more monolithic lining application.
3) Engage the services of a cathodic protection systems professional to evaluate the operation of the impressed current CP system.

Erection Year
Roof Design
Height of Each Course
No. Roof Hatches/Location
Size of Roof Hatch
Four
Center
Scope
No
Number of Courses
Site Information
Diameter (feet) Yes
Client Contact:

Tank Owner/Client:

Tank Name:

City of Santa Paula
Case
Rob Lepore
Dive Supervisor:

Steven Metcalf Jr
Josh Servera
Stub
Yes
Yes
Yes
Item Notes
Date of Last Inspection
Ladder
30 in
Sacraficial Annode
No
Steven Metcalf
Dive Tender
Dive Leader:
1 of
Completed By Metcalf
1 CSI Job No.

Page
240243
08/20/25 Wednesday
N/A
None
P.O. Box 801357, Santa Clarita, CA 91380
Water Agitator
Yes
Phone: 877.274.2422 (toll free) Date
Fax: 661.755.7628
www.CSIServices.biz
Field Water Tank Dive Inspection Report
Description
Interior Structural Characteristics
Roof Accessible
Overhead Power Lines
Water Depth
No
Tank Geometry
Pitched Roof with Drip Ring
No. of Columns
None
16 ft
Item
GPS Coordinates
Cross Street
Tank Location
Surrounding Site Dirt
Nearest Structures
Pine Grove Rd
8200 Pine Grove Rd, Santa Paula CA

34.40955, -119.07742
Roof Structure Rafters and Center Column
Pipe
Item
Column Design
No
Yes
N/A
No. Interior Ladder
Outlet Design
Perimeter Fencing
Site secured on arrival
Data
Antenna on Tank
One
Item Data
No
Stub
Connections
Column Base Design
Bolted
Free Plate with Clips
Upper Center Column Dollar Plate CP System/Type
Inlet Interior Design
Overflow Design An Upper Funnel Barrier Walls
Capacity (gallons)
Exterior Structural Characteristics
500,000
Lining Type/Original
Item
Epoxy
Data
1968
Item Data
on grade
Overflow Pipe Diameter
Flexible Pipe Coupling
Outlet Diameter
Inlet Diameter
Multipule
Roof Rail Satisfactory
Height (feet) Roof Rail System
Center Roof Vent Size
Tank Profile
60 24
Roof Vent Sealed
36702-03 At Hatch Rail Location
Type of Manways
No. Shell Manways
Diameter of Manways
Manway Cover Design
Welded Steel One
Round
Cylinder
Yes
Yes
One
Roof Tie-Off Present
Polyurethane
Tank Type Potable
N/A
Yes
Gravel
Exterior Vandal Deterrent
Miscellaneous Notes
Round Hood
Construction Co. Pitt Des Moines No
Maintenance Inspection
One Column
Roof Vent Design
Lining Type/Original
704
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© Copyright CSI Services, Inc. 2004
Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected of the paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

This condition identifies an area with
wholesale coating defects or corrosion
concerns that will typically require
significant removal and replacement of
the coatings in the area.

This condition identifies an area with
partial coating defects or corrosion
concerns that will require significant
rework.

Good
This condition is rated for areas without
any considerable coating defects or
corrosion. These surfaces are in a
condition that is typical for the age of the
coating system.

This condition identifies areas with
coating defects or corrosion that is
typically seen in one-year warranty
inspections. Typically, only minor spot
repairs are required.

Excellent
This condition is for areas without any
considerable coating defects or corrosion.

Typically, these surfaces are in a
condition that is better than expected for
the age of the system.

This condition identified areas that
typically are in perfect condition and
require no repair work.
753
Copyright CSI Services, Inc. 2004
Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust.

Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1 Rust Grade 0
Rust Grade Description
10 No rusting or less than 0.01% of surface rusted
9 Minute rusting, less than 0.03% of surface rusted
8 Few isolated rust spots, less than 0.1% of surface rusted 7 Less than 0.3% of surface rusted
6 Excessive rust spots, but less than1% of surface rusted 5 Rusting to the extent of 3% of surface rusted
4 Rusting to the extent of 10% of surface rusted
3 Approximately one-sixth of the surface rusted
2 Approximately one-third of the surface rusted
1 Approximately one-half of the surface rusted
0 Approximately 100% of the surface rusted
754
© Copyright CSI Services, Inc. 2004
Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

The edges of the
affected area are leaf
like and resemble the
separated pages of a
wetted book.
5 Structural Loss - This
condition involves
metal loss or failure
where components
will require structural
consideration
The photos depicted are examples and were not taken on this project. 755
© Copyright CSI Services, Inc. 2004
Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints
No .8 No. 6 No .4 No. 2

Dark Colored Paints
No .8 No. 6 No .4 No. 2
756
© Copyright CSI Services 2004
Chart 5 - Adhesion Rating The figures below depict the photographic standards and criteria referenced in ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test” and ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife.” Both Standards are used to assess the condition of a paint system for life-cycle projections. It is also used to evaluate an existing paint system’s ability to withstand the added stress that any overcoating strategies can create. Depending upon the thickness of the paint system, ASTM D3359 has two different test methods. The rating criteria for both standards follow:

ASTM D3359
Method A Method B
Rating Observation
Surface of X-cut from
which flaking/peeling has
occurred
Rating Percent Area
Removed
Surface of cross-cut area from
which flaking has occurred for
six parallel cuts and adhesion
range by percent
5A
No peeling or
removal None 5B 0% none
4A
Trace peeling or
removal along
incisions or their
intersection
4B Less than
5%
3A
Jagged Removal
along incisions up
to 1/16” on either
side
3B 5 – 15%
2A
Jagged removal
along most of
incisions up to 1/8”
on either side
2B 15 – 35%
1A
Removal from most
of the area of the X
under the tape 1B 35-65%
0A
Removal beyond
the area of the X 0B Greater than
65%
ASTM D6677
Rating Description
10 Fragments no larger than ” x ” can be removed with difficulty 8 Chips up to ” x ” can be removed with difficulty
6 Chips up to ” x ” can be removed with slight difficulty 4 Chips larger than ” x ” can be removed with slight pressure 2 Once coating removal is initiated by knife, it can be peeled at least ” 0 Coating can be peeled easily to length greater than ” 757
© Copyright CSI Services, Inc. 2004
Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8).

Few Medium Medium Dense Dense
Blister
Size No. 2
Blister
Size No. 4
Blister
Size No. 6
Blister
Size No. 8
758

Consulting Evaluations Tank Diving Inspection
October 31, 2025 Via Email: [email protected]
Luis Garcia Office: 805.266.8152
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Subject: Final Report - Maintenance Inspection

Re: Cherry Hill Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
759
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Cherry Hill Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

CSI Services, Inc.
_________________
N. Randy Gordon, PCS
Technical Services Manager October 31, 2025
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
760
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents

Introduction ..……………………………..………….………… Page 1

Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 8

Attachments

761
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

Page 1 ends

October 31, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Cherry Hill Reservoir located near 6461-6339 Pine Grove Rd, Santa Paula, CA 93060. This report documents the findings of the inspection and services performed.

The field-work was completed on August 20, 2025 by a team primarily comprised of Josh Severa, Steven Metcalf and Steven Metcalf Jr. The exterior shell observations were made mostly from grade level, while the exterior of the roof was examined closeup. The interior inspection was carried out with the tank’s water level at approximately 16 feet using special underwater diving equipment and techniques. Steve Metcalf was the site supervisor and Anthony Jackson was the lead diver. Mr. Randy Gordon, Technical Services Manager, reviewed the results of the field data and prepared recommendations for maintenance work. Mr. Gordon has over 35 years of experience through the evaluation of thousands of storage tanks and other industrial structures. He is certified as an SSPC Protective Coating Specialist (PCS) and NACE/SSPC Level 3 Coating Inspector.

Summary
The paint system on the exterior was found to be relatively thin and in good condition overall. The exterior surfaces have only isolated spot rust and the paint was found to have weathered from chalking, however, the overall film thickness of the paint system and its general satisfactory adhesion makes it an ideal candidate for future overcoating strategies. Currently, it is recommended that the existing paint system be spot repaired at the next maintenance interval to prevent further degradation of the system and suspend any active corrosion.

The interior lining appears to be a thick-film aromatic polyurethane hybrid (Likely Polibrid 705) in an overall fair condition with widespread rust, delaminations, and numerous application defects including very large sags and runs. However, the sacrificial anode CP system is preventing more advanced forms of corrosion from developing below the HWL and while the existing lining is nearing the end of its lifespan, the eventual relining project can be likely be postponed perhaps beyond 2030. 762
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
Background
The Cherry Hill Reservoir is a welded steel on grade structure that was constructed in 1954. The tank is approximately 66 feet in diameter by 21 feet high providing a nominal capacity of 535,164 gallons and is located near 6461-6339 Pine Grove Rd, Santa Paula, CA 93060. It is the only tank at this hillside site.

The tank shell has four courses that are connected to a conical roof with rafters and one center column. The tank has one center vent, one roof hatch, and two monobolt shell manways. There is an interior ladder and one exterior ladder. The exterior ladder has fall a protection device and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band. There is an internal sacrificial anode cathodic protection (CP) system associated with this tank. The tank has a mechanical, halftravel, water level indicator that improperly gauges the tank’s height at 24 feet.

It is believed that the interior lining is a 3rd generation system. The interior steel surfaces, including the roof and roof support members, are coated with a high-build aromatic hybrid polyurethane and a multicoat thin-film epoxy. The exterior roof, shell, and appurtenances are painted with what appears to be a polyurethane system. The internal roof lap seams are not caulked.

Field Evaluation
The purpose of this survey was to assess the condition of the existing coatings and recommend maintenance coating work, where needed. The evaluation mainly involved visual observations but also involved various testing procedures. Photographs and video were taken to document the field inspections, and a photo summary and narrated video are included within this report.

Where applicable, the characteristic or stage of corrosion was determined in 763
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in good condition with minimal chalking (ASTM D4214, No. 8). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than 0.03 percent of the overall surface area and rated a 9 in accordance with ASTM D610. At the shell, the exterior paint system is in good condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. The paint thicknesses were found to range from 12 to 15 mils on the roof and 12 to 14 mils on the shell. The paint system was estimated to exhibit moderate adhesion (ASTM D6677) at the shell and satisfactory adhesion (ASTM D6677, 5A) at the roof.

Some of the specific data collected follows:

Delamination
Spot peeling
8 22
99 N
2 99
W
22 Good
9 N
9 ES E
2 9
2 Exterior Paint
Paint Defects
Roof Quadrant
SW
Good
9 Exterior
2 8 88 88 8 8 8 88 8
9 Shell Quadrant
Exterior Good
Overall Condition
Tank Support
Exterior
9 S
Good
W
9 2222
NE
9 Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
764
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
Above Water Condition Below Water Condition Fair
99 E
2/Few
Yes
Moderate
2/Few
Yes
Moderate
2 Yes
2 9 9
Interior Paint
Interior
Moderate
2/Few
9 Floor Quadrant
SW
Fair
Shell Quadrant
Yes
2/Few
S
Paint Defects/Overall Grade
99 9
Interior
WN
99 WN E N
Fair
E
Good Interior
Yes
99 S
22 Yes
Yes Yes
Roof Quadrant
2/Few 2/Few 2/Few 2/Few
2 Yes Yes
Fair
2 Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
Moderate
Rust areas (ASTM D610)
Rust spots (ASTM D610)
Interior
The roof area is defined as those surfaces above the highest water level (HWL). Closeup visual examinations were made to all areas below the waterline and all other areas were assessed from the water level. The coating on the underside of the roof plates and roof support structure is in good condition with corrosion common to the edges of the support member flanges and edges of roof plates. Minor instances of spot peeling and cracking were observed throughout with dark corrosion (CSI Corrosion Grades 2) appearing from undercutting. The total amount of corrosion on the roof was rated to be approximately 0.03 percent of the total surface area (ASTM D610, 9), and there was a minor amount of rust staining present at the upper shell course from the roof, emanating from the faying surfaces at the roof structure. The most prominent defect observed at the roof where the gross application defects associated with some recent plural component spray application of an unknown material.

The floor had a large amount of sediment upon it, but spot checks revealed the lining at the tank bottom was in good condition, (ASTM D610, 9) with the same patterning of blisters observed at the shell (2/Few). The vast majority of the blisters retain their blister caps.

The data collected from the inspection follows:
765
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
Dive Inspection Video
Cut and paste the external link: https://photos.app.goo.gl/vo2AV9Ku2yugo5tK6 Discussion
In general, the exterior paint system on the tank is aged, relatively thin, and exhibits moderate chalking with satisfactory adhesion between the finish coat and the primer in all areas tested. There are few areas of pinpoint and spot rusting within the paint system upon the roof, primarily at plate depressions where water tends to pond and immerse the paint system for long periods of time. Although the shell surfaces have some isolated spot rust, the paint system was providing general corrosion protection, at this time. The paint will likely continue to provide protection of the steel for a few more years, but it will continue to oxidize and degrade.

Chalking is the term for the powdery characteristic of an aged coating that may also have a faded finish. Chalking is a result of the natural breakdown of a paint system's binder when it is exposed to sunlight. The binder (or resin) degrades in ultraviolet light, which leaves behind the unbound pigment or chalk. Aside from a faded appearance, chalking can result in corrosion as the film weathers (thins) away through cycles of wind and rain. As the paint endures years of direct sunlight, it begins to weather away, which results in the paint no longer providing enough barrier protection from corrosion.

Rust is a result of ferrous metal essentially converting itself back to its original state, iron ore. It takes a tremendous amount of energy to convert an ore into a usable metal.

These metals then try to naturally release this energy through the development of rust.

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October 31, 2025
the process initiates itself as light colored orange surface rust. As the corrosion process continues, the rust becomes darker in color until it eventually results in advancing forms of metal loss. Metal loss can take the form of pitting, which is a localized corrosion cell that results in cavities or holes developing in the metal.

On this basis, and due to the satisfactory adhesion observed at the roof and shell, the tank exterior paint should be spot repaired at the next maintenance interval.

Overall, the tank interior coatings are in a fair condition in the area above the highest water level (HWL), and in fair condition below the HWL. The lining on the underwater areas of the tank is mostly free of widespread corrosion, but there are localized areas of spot rust, including the beginning stages of exfoliation at irregular surfaces such as the ladder, dollar plate, rafter flanges, shell penetrations for accessories, and rough welds. 767
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
A tank roof, including its roof support structure has many open, unsealed areas by design. These open areas are primarily at the inaccessible crevices that are between the top of the roof beam flanges and the roof plate. The cost of properly sealing these areas becomes a diminishing return, notably when one considers that small crevice areas often develop into dead-air space. The minor amount of rust staining is simply a result of some areas not being completely sealed by coatings.

It is not clear what caused the blisters to develop, but their locations and pattern is similar to coating symptoms that would be seen from with an improperly functioning cathodic protection (CP) system. The tell-tale sign of an over energized CP system are circular patches of blisters in areas adjacent to the CP anodes. This indicates that the CP system may not be properly operating and may be damaging the coating. This defect from cathodic disbondment can result in blistering as the over-energized CP generates hydrogen under the coating, creating blisters. No significant corrosion is associated with the condition. As a result, the only recommendation with respect to the blistering issue is to evaluate the proper operation of the CP system to avoid the continued damage to the coating.

The tank ventilation was found to have screening installed without gaps or penetrations. 768
Final Report - Maintenance Inspection
City of Santa Paula – Cherry Hill Reservoir
MKN Associates

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October 31, 2025
Recommendations
The following activities are recommended for remedial work:

Exterior:
1) No coatings work is required at this time. Plan on a future spot repair and overcoat of the paint system in conjunction with the future relining to best amortize costs.

Interior:
2) Within the next 5 to 7 years, remove and replace the lining system. a) This work should include abrasive blast cleaning all surfaces to SSPC SP10, “Near White Blast Cleaning” followed by three coats of an ANSI/NSF certified epoxy at 4 to 6 mils per coat.
3) Engage the services of a cathodic protection systems professional to evaluate the operation of the sacrificial anode CP system.

NOTICE: This report represents the opinion of CSI Services, Inc. This report is issued in conformance with generally acceptable industry practices. While customary precautions were taken to ensure that the information gathered and presented is accurate, complete, and technically correct, it is based on the information, data, time, and materials obtained and does not guarantee a leak proof tank. 769
© Copyright CSI Services 2023
Maintenance Inspection
One Column
Roof Vent Design
Lining Type/Original
Miscellaneous Notes
Round Hood
Construction Co. ARL Standard Tank No
Yes
One
Roof Tie-Off Present
Polyurethane
Tank Type Potable
Corral
Yes
Gravel
Exterior Vandal Deterrent
At Hatch
Type of Manways
No. Shell Manways
Diameter of Manways
Manway Cover Design
Welded Steel One
Round
Cylinder
Yes
Roof Rail Satisfactory
Height (feet) Roof Rail System
Center Roof Vent Size
Tank Profile
66 21
Roof Vent Sealed
FC44976 Rail Location
Data
1954
Item Data
on grade
Overflow Pipe Diameter
Flexible Pipe Coupling
Outlet Diameter
Inlet Diameter
Multipule
Inlet Interior Design
Overflow Design Capped Stub Barrier Walls
Capacity (gallons)
Exterior Structural Characteristics
535,164
Lining Type/Original
Item
Epoxy
No
Stub
Connections
Column Base Design
Bolted
Free Plate with Clips
Upper Center Column Dollar Plate CP System/Type
Perimeter Fencing
Site secured on arrival
Data
Antenna on Tank
One
Item Data
Roof Structure Rafters and Center Column
Pipe
Item
Column Design
No
Yes
N/A
No. Interior Ladder
Outlet Design
Item
GPS Coordinates
Cross Street
Tank Location
Surrounding Site Dirt
Nearest Structures
Pine Grove Rd
8200 Pine Grove Rd, Santa Paula CA

34.40955, -119.07742
Water Depth
No
Tank Geometry
Pitched Roof with Drip Ring
No. of Columns
None
16 ft
Phone: 877.274.2422 (toll free)
Fax: 661.755.7628
www.CSIServices.biz
Field Water Tank Dive Inspection Report
Description
Interior Structural Characteristics
Roof Accessible
Overhead Power Lines
Satisfactory
None
P.O. Box 801357, Santa Clarita, CA 91380
Water Agitator
Yes
Date
1 of
Completed By Metcalf
1 CSI Job No.

Page
240243
08/20/25 Wednesday
Date of Last Inspection
Ladder
12 in
Sacraficial Annode
No
Steven Metcalf
Dive Tender
Dive Leader:

Dive Supervisor:

Steven Metcalf Jr
Josh Servera
Stub
Yes
Yes
Yes
Item Notes
Client Contact:

Tank Owner/Client:

Tank Name:

City of Santa Paula
Cherry Hill
Rob Lepore
Site Information
Diameter (feet) Yes
Number of Courses
Scope
No
Tank Type
Contract No.

Erection Year
Roof Design
Height of Each Course
No. Roof Hatches/Location
Size of Roof Hatch
Four
On Hatch
12 in
The information reported was obtained using visual observations and testing believed to be accurate. The information reported represents the data obtained from the specific representative areas inspected, tested, and/or verified. This document shall only be produced in its entirety. 24 in
One
Hatch Design
No. Roof Vents/Location
Shell Inlet and Outlet
20 in 12 in
YEs
Overflow Exterior Design
Drain Location
Water Level Indicator
Tank Foundation
Two Screen Air Gap
N/A
Tank Piping
Ext Ladder Fall Prevent
Ext Ladder Satisfactory
Yes
Yes
No. & Type Roof Access
Yes
Unibolt No
Square Shoe Box
Near Edge
Shell
Caulking Roof No Columns
Two Shell Manways
12 in
770
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© Copyright CSI Services, Inc. 2004
Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected of the paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

This condition identifies an area with
wholesale coating defects or corrosion
concerns that will typically require
significant removal and replacement of
the coatings in the area.

This condition identifies an area with
partial coating defects or corrosion
concerns that will require significant
rework.

Good
This condition is rated for areas without
any considerable coating defects or
corrosion. These surfaces are in a
condition that is typical for the age of the
coating system.

This condition identifies areas with
coating defects or corrosion that is
typically seen in one-year warranty
inspections. Typically, only minor spot
repairs are required.

Excellent
This condition is for areas without any
considerable coating defects or corrosion.

Typically, these surfaces are in a
condition that is better than expected for
the age of the system.

This condition identified areas that
typically are in perfect condition and
require no repair work.
824
Copyright CSI Services, Inc. 2004
Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust.

Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1 Rust Grade 0
Rust Grade Description
10 No rusting or less than 0.01% of surface rusted
9 Minute rusting, less than 0.03% of surface rusted
8 Few isolated rust spots, less than 0.1% of surface rusted 7 Less than 0.3% of surface rusted
6 Excessive rust spots, but less than1% of surface rusted 5 Rusting to the extent of 3% of surface rusted
4 Rusting to the extent of 10% of surface rusted
3 Approximately one-sixth of the surface rusted
2 Approximately one-third of the surface rusted
1 Approximately one-half of the surface rusted
0 Approximately 100% of the surface rusted
825
© Copyright CSI Services, Inc. 2004
Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

The edges of the
affected area are leaf
like and resemble the
separated pages of a
wetted book.
5 Structural Loss - This
condition involves
metal loss or failure
where components
will require structural
consideration
The photos depicted are examples and were not taken on this project. 826
© Copyright CSI Services, Inc. 2004
Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints
No .8 No. 6 No .4 No. 2

Dark Colored Paints
No .8 No. 6 No .4 No. 2
827
© Copyright CSI Services 2004
Chart 5 - Adhesion Rating The figures below depict the photographic standards and criteria referenced in ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test” and ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife.” Both Standards are used to assess the condition of a paint system for life-cycle projections. It is also used to evaluate an existing paint system’s ability to withstand the added stress that any overcoating strategies can create. Depending upon the thickness of the paint system, ASTM D3359 has two different test methods. The rating criteria for both standards follow:

ASTM D3359
Method A Method B
Rating Observation
Surface of X-cut from
which flaking/peeling has
occurred
Rating Percent Area
Removed
Surface of cross-cut area from
which flaking has occurred for
six parallel cuts and adhesion
range by percent
5A
No peeling or
removal None 5B 0% none
4A
Trace peeling or
removal along
incisions or their
intersection
4B Less than
5%
3A
Jagged Removal
along incisions up
to 1/16” on either
side
3B 5 – 15%
2A
Jagged removal
along most of
incisions up to 1/8”
on either side
2B 15 – 35%
1A
Removal from most
of the area of the X
under the tape 1B 35-65%
0A
Removal beyond
the area of the X 0B Greater than
65%
ASTM D6677
Rating Description
10 Fragments no larger than ” x ” can be removed with difficulty 8 Chips up to ” x ” can be removed with difficulty
6 Chips up to ” x ” can be removed with slight difficulty 4 Chips larger than ” x ” can be removed with slight pressure 2 Once coating removal is initiated by knife, it can be peeled at least ” 0 Coating can be peeled easily to length greater than ” 828
© Copyright CSI Services, Inc. 2004
Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8).

Few Medium Medium Dense Dense
Blister
Size No. 2
Blister
Size No. 4
Blister
Size No. 6
Blister
Size No. 8
829

Re: Fuchsia Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
830
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Fuchsia Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

Consulting Evaluations Tank Diving Inspection
831
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents

Introduction ..……………………………..………….………… Page 1

Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 8

Attachments

832
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

Page 1 ends

October 31, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Fuchsia Reservoir located near 893 Coronado Cir, Santa Paula CA. This report documents the findings of the inspection and services performed.

The field-work was completed on August 20, 2025 by a team primarily comprised of Josh Severa, Steven Metcalf and Steven Metcalf Jr. The exterior shell observations were made mostly from grade level, while the exterior of the roof was examined closeup. The interior inspection was carried out with the tank’s water level at approximately 16 feet using special underwater diving equipment and techniques. Steve Metcalf was the site supervisor and the lead diver. Mr. Randy Gordon, Technical Services Manager, reviewed the results of the field data and prepared recommendations for maintenance work. Mr. Gordon has over 35 years of experience through the evaluation of thousands of storage tanks and other industrial structures. He is certified as an SSPC Protective Coating Specialist (PCS) and NACE/SSPC Level 3 Coating Inspector.

The interior lining appears to be a somewhat recent multicoat, thin-film epoxy system that is in an overall good condition with no wholesale defects. The sacrificial anode CP system is preventing more advanced forms of corrosion from developing below the HWL. This tank should be placed back on a 3 to 5 year maintenance inspection schedule in accordance with AWWA and continue to perform patch repairs which will extend the overall lifespan of this lining.
833
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

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October 31, 2025
Background
The Fuchsia Reservoir is a welded steel on grade structure that was constructed in 1955. The tank is approximately 60 feet in diameter by 24 feet high providing a nominal capacity of 500,000 gallons and is located near 893 Coronado Cir, Santa Paula CA. It is the only tank at this hillside site and is bordered by homes to the west.

The tank shell has three courses that are connected to a conical roof with rafters and one center column. The tank has one center vent, one roof hatch, and two multibolt shell manways. There is an interior ladder and one exterior ladder. The exterior ladder has fall a protection device and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band. There is an internal sacrificial anode cathodic protection (CP) system associated with this tank. The tank has a mechanical, halftravel, water level indicator that improperly gauges the tank’s height at 24 feet.

It is believed that the interior lining is a 3rd generation system. The interior steel surfaces, including the roof and roof support members, are coated with a multicoat thin film epoxy. The exterior roof, shell, and appurtenances are painted with what appears to be a polyurethane system. The internal roof lap seams are not caulked.

Field Evaluation
The purpose of this survey was to assess the condition of the existing coatings and recommend maintenance coating work, where needed. The evaluation mainly involved visual observations but also involved various testing procedures. Photographs and video were taken to document the field inspections, and a photo summary and narrated video are included within this report.

Where applicable, the characteristic or stage of corrosion was determined in accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking 834
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

Page 3 ends

October 31, 2025
was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in excellent condition with minimal chalking (ASTM D4214, No. 8). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than 0.03 percent of the overall surface area and rated a 9 in accordance with ASTM D610. At the shell, the exterior paint system is in excellent condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. The paint thicknesses were found to range from 9 to 10 mils on the roof and 14 to 15 mils on the shell. The paint system was estimated to exhibit moderate adhesion (ASTM D6677) at the shell and satisfactory adhesion (ASTM D6677, 5A) at the roof.

Some of the specific data collected follows:

Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
NE
9 Exterior
9 S
Excellent
W
9 Tank Support
Exterior Excellent
Overall Condition
9 Shell Quadrant
88 8 88 8 88 88 8
Paint Defects
Roof Quadrant
SW
Excellent
9 Exterior
9 Exterior Paint
ES E
99 N
Excellent
99 W
99 N
8 Delamination
Spot peeling
835
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

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October 31, 2025
Interior
The roof area is defined as those surfaces above the highest water level (HWL). Closeup visual examinations were made to all areas below the waterline and all other areas were assessed from the water level. The coating on the underside of the roof plates and roof support structure is in good condition with corrosion common to the edges of the support member flanges and edges of roof plates. Minor instances of spot peeling and cracking were observed throughout with dark corrosion (CSI Corrosion Grades 2) appearing from undercutting. The total amount of corrosion on the roof was rated to be approximately 0.03 percent of the total surface area (ASTM D610, 9), and there was a minor amount of rust staining present at the upper shell course from the roof, emanating from the faying surfaces at the roof structure.

The data collected from the inspection follows:

Rust areas (ASTM D610)
Rust spots (ASTM D610)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Good
22 Yes Yes
Yes Yes
Roof Quadrant
Yes
99 S
22 Yes
WN E
Good
E
Good Interior
N
99 Interior
WN
99 Paint Defects/Overall Grade
9 Yes
S
9 Floor Quadrant
SW
Good
Shell Quadrant
Interior Paint
Interior
99 2
Yes
2 Yes
Yes
E
99 Above Water Condition Below Water Condition Good
836
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

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October 31, 2025
Dive Inspection Video
Cut and paste the external link: https://photos.app.goo.gl/vo2AV9Ku2yugo5tK6 Discussion
In general, the exterior paint system on the tank is relatively thin, and exhibits negligible chalking with satisfactory adhesion between the finish coat and the primer in all areas tested. There are few areas of pinpoint and spot rusting within the paint system upon the roof, primarily at plate depressions where water tends to pond and immerse the paint system for long periods of time. Although the shell surfaces have some isolated spot rust, the paint system was providing general corrosion protection, at this time. The paint will likely continue to provide protection of the steel for a few more years, but it will continue to oxidize and degrade.

Chalking is the term for the powdery characteristic of an aged coating that may also have a faded finish. Chalking is a result of the natural breakdown of a paint system's binder when it is exposed to sunlight. The binder (or resin) degrades in ultraviolet light, which leaves behind the unbound pigment or chalk. Aside from a faded appearance, chalking can result in corrosion as the film weathers (thins) away through cycles of wind and rain. As the paint endures years of direct sunlight, it begins to weather away, which results in the paint no longer providing enough barrier protection from corrosion.

Rust is a result of ferrous metal essentially converting itself back to its original state, iron ore. It takes a tremendous amount of energy to convert an ore into a usable metal.

These metals then try to naturally release this energy through the development of rust.

Page 6 ends

On this basis, and due to the satisfactory adhesion observed at the roof and shell, the tank exterior paint should be spot repaired at the next maintenance interval.

Overall, the tank interior coatings are in a fair condition in the area above the highest water level (HWL), and in fair condition below the HWL. The lining on the underwater areas of the tank is mostly free of widespread corrosion, but there are localized areas of spot rust, including the beginning stages of exfoliation at irregular surfaces such as the ladder, dollar plate, rafter flanges, shell penetrations for accessories, and rough welds. 838
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

Page 7 ends

The tank ventilation was found to have screening installed without gaps or penetrations. 839
Final Report - Maintenance Inspection
City of Santa Paula – Fuchsia Reservoir
MKN Associates

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October 31, 2025
Recommendations
The following activities are recommended for remedial work:

Exterior:
1) No coatings work is required at this time. Spot repair the paint system at the next maintenance interval.

Interior:
2) No coatings work is required at this time. Place the tank back on a 3-to-5-year maintenance inspection schedule as recommended by AWWA and continue to make patch repairs which will extend the overall lifespan of the lining. 3) Engage the services of a cathodic protection systems professional to evaluate the operation of the sacrificial anode CP system.

Erection Year
Roof Design
Height of Each Course
No. Roof Hatches/Location
Size of Roof Hatch
Three
Edge
Scope
No
Number of Courses
Site Information
Diameter (feet) Yes
Client Contact:

Tank Owner/Client:

Tank Name:

City of Santa Paula
Fuchsia
Rob Lepore
Dive Supervisor:

Steven Metcalf Jr
Josh Servera
Stub
Yes
Yes
Yes
Item Notes
Date of Last Inspection
Ladder
12x18 in
Sacraficial Annode
No
Steven Metcalf
Dive Tender
Dive Leader:
1 of
Completed By Metcalf
1 CSI Job No.

Page
240243
08/20/25 Wednesday
N/A
P.O. Box 801357, Santa Clarita, CA 91380
Water Agitator
Yes
Phone: 877.274.2422 (toll free) Date
Fax: 661.755.7628
www.CSIServices.biz
Field Water Tank Dive Inspection Report
Description
Interior Structural Characteristics
Roof Accessible
Overhead Power Lines
Water Depth
No
Tank Geometry
Pitched Roof with Drip Ring
No. of Columns
None
16 ft
Item
GPS Coordinates
Cross Street
Tank Location
Surrounding Site Dirt
Nearest Structures
Fuchsia Ln
893 Coronado Cir, Santa Paula CA

34.36879, -119.06714
Roof Structure Rafters and Center Column
I Beams
Item
Column Design
No
Yes
N/A
No. Interior Ladder
Outlet Design
Perimeter Fencing
Site secured on arrival
Data
Antenna on Tank
One
Item Data
No
T Pipe with Duckbill
Connections
Column Base Design
Bolted
Crows Foot
Upper Center Column Dollar Plate CP System/Type
Inlet Interior Design
Overflow Design A Lower Funnel Barrier Walls
Capacity (gallons)
Exterior Structural Characteristics
1,000,000
Lining Type/Original
Item
Epoxy
Data
1955
Item Data
on grade
Overflow Pipe Diameter
Flexible Pipe Coupling
Outlet Diameter
Inlet Diameter
8 Ft
Roof Rail Satisfactory
Height (feet) Roof Rail System
Center Roof Vent Size
Tank Profile
60 24
Roof Vent Sealed
59312 At Hatch Rail Location
Type of Manways
No. Shell Manways
Diameter of Manways
Manway Cover Design
Welded Steel One
Round
Cylinder
Yes
Yes
One
Roof Tie-Off Present
Polyurethane
Tank Type Potable
N/A
Yes
Gravel
Exterior Vandal Deterrent
Miscellaneous Notes
Round Hood and Slanted
Construction Co. Consolidated Western No
Maintenance Inspection
One Column
Roof Vent Design
Lining Type/Original
841
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© Copyright CSI Services, Inc. 2004
Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected of the paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

This condition identifies an area with
wholesale coating defects or corrosion
concerns that will typically require
significant removal and replacement of
the coatings in the area.

This condition identifies an area with
partial coating defects or corrosion
concerns that will require significant
rework.

Good
This condition is rated for areas without
any considerable coating defects or
corrosion. These surfaces are in a
condition that is typical for the age of the
coating system.

This condition identifies areas with
coating defects or corrosion that is
typically seen in one-year warranty
inspections. Typically, only minor spot
repairs are required.

Excellent
This condition is for areas without any
considerable coating defects or corrosion.

Typically, these surfaces are in a
condition that is better than expected for
the age of the system.

This condition identified areas that
typically are in perfect condition and
require no repair work.
896
Copyright CSI Services, Inc. 2004
Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust.

Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1 Rust Grade 0
Rust Grade Description
10 No rusting or less than 0.01% of surface rusted
9 Minute rusting, less than 0.03% of surface rusted
8 Few isolated rust spots, less than 0.1% of surface rusted 7 Less than 0.3% of surface rusted
6 Excessive rust spots, but less than1% of surface rusted 5 Rusting to the extent of 3% of surface rusted
4 Rusting to the extent of 10% of surface rusted
3 Approximately one-sixth of the surface rusted
2 Approximately one-third of the surface rusted
1 Approximately one-half of the surface rusted
0 Approximately 100% of the surface rusted
897
© Copyright CSI Services, Inc. 2004
Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

The edges of the
affected area are leaf
like and resemble the
separated pages of a
wetted book.
5 Structural Loss - This
condition involves
metal loss or failure
where components
will require structural
consideration
The photos depicted are examples and were not taken on this project. 898
© Copyright CSI Services, Inc. 2004
Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints
No .8 No. 6 No .4 No. 2

Dark Colored Paints
No .8 No. 6 No .4 No. 2
899
© Copyright CSI Services 2004
Chart 5 - Adhesion Rating The figures below depict the photographic standards and criteria referenced in ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test” and ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife.” Both Standards are used to assess the condition of a paint system for life-cycle projections. It is also used to evaluate an existing paint system’s ability to withstand the added stress that any overcoating strategies can create. Depending upon the thickness of the paint system, ASTM D3359 has two different test methods. The rating criteria for both standards follow:

ASTM D3359
Method A Method B
Rating Observation
Surface of X-cut from
which flaking/peeling has
occurred
Rating Percent Area
Removed
Surface of cross-cut area from
which flaking has occurred for
six parallel cuts and adhesion
range by percent
5A
No peeling or
removal None 5B 0% none
4A
Trace peeling or
removal along
incisions or their
intersection
4B Less than
5%
3A
Jagged Removal
along incisions up
to 1/16” on either
side
3B 5 – 15%
2A
Jagged removal
along most of
incisions up to 1/8”
on either side
2B 15 – 35%
1A
Removal from most
of the area of the X
under the tape 1B 35-65%
0A
Removal beyond
the area of the X 0B Greater than
65%
ASTM D6677
Rating Description
10 Fragments no larger than ” x ” can be removed with difficulty 8 Chips up to ” x ” can be removed with difficulty
6 Chips up to ” x ” can be removed with slight difficulty 4 Chips larger than ” x ” can be removed with slight pressure 2 Once coating removal is initiated by knife, it can be peeled at least ” 0 Coating can be peeled easily to length greater than ” 900
© Copyright CSI Services, Inc. 2004
Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8).

Few Medium Medium Dense Dense
Blister
Size No. 2
Blister
Size No. 4
Blister
Size No. 6
Blister
Size No. 8
901

Re: Limoneria Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
902
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Limoneria Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

Consulting Evaluations Tank Diving Inspection
903
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents

Introduction ..……………………………..………….………… Page 1

Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 7

Attachments

904
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

Page 1 ends

October 21, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Limoneria Reservoir located near 13459-12899 Foothill Rd, Santa Paula, CA 93060. This report documents the findings of the inspection and services performed.

The field-work was completed on August 19, 2025 by a team primarily comprised of Josh Severa, Steven Metcalf and Steven Metcalf Jr. The exterior shell observations were made mostly from grade level, while the exterior of the roof was examined closeup. The interior inspection was carried out with the tank’s water level at approximately 34 feet, but the diver was unable to physically enter the tank, however, the camera was lowered into the water and some information was obtained. Steve Metcalf was the site supervisor and the lead diver. Mr. Randy Gordon, Technical Services Manager, reviewed the results of the field data and prepared recommendations for maintenance work. Mr. Gordon has over 35 years of experience through the evaluation of thousands of storage tanks and other industrial structures. He is certified as an SSPC Protective Coating Specialist (PCS) and NACE/SSPC Level 3 Coating Inspector.

Summary
The ~60 year old paint system on the tank is in overall poor condition with widespread and pervasive corrosion at the roof. The exterior paint system is severely weathered and has poor adhesion, making overcoating strategies risky. The existing paint system is believed to be the original system applied and potentially has high concentrations of heavy metals (e.g. lead, chromium, etc.) that will require special precautions to protect the workers and environment when it is disturbed. The paint system should be tested to identify the concentrations of heavy metals before any work takes place.

The original coal tar epoxy and coal tar enamel lining within the tank is in an overall unsatisfactory condition with widespread rust and blistering. The majority of the corrosion is within the MWL elevations of the tank shell and includes dark rust, pitting, exfoliation and the beginning stages of structural loss. The existing conditions dictate that the interior lining system should be removed and replaced within the next year to prevent further metal loss, necessitating the repair or replacement of steel elements when a relining is all that is required at this time.
905
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
Background
The Limoneria Reservoir is a Welded Steel on grade structure that was constructed in the 1950’s. The tank is approximately 60 feet in diameter by 36 feet high providing a nominal capacity of 1,000,000 gallons and is located at near 13459-12899 Foothill Rd, Santa Paula, CA 93060. It is the only tank at this hillside site.

The tank shell has six courses that are connected to a conical roof with rafters, girders and one center column. The tank has one roof vent, one roof hatch, and two shell multibolt manways. There is NO interior ladder and one exterior ladder. The exterior ladder has fall protection and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band and is not seismically anchored. There is no internal or external cathodic protection (CP) system associated with this tank. The tank has a mechanical water level indicator.

It is believed that the interior linings are the original coatings applied. The interior steel surfaces, including the roof and roof support members are coated with a coal tar epoxy system while the tank shell, floor, and appurtenances are coated with a hot applied coal tar enamel. The exterior roof, shell, and appurtenances are painted with what appears to be the original Type IV, lead based, alkyd paint system. The internal roof lap seams are not caulked.

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October 21, 2025
Where applicable, the characteristic or stage of corrosion was determined in accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in poor condition with moderate chalking (ASTM D4214, No. 8). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than ten percent of the overall surface area and rated a 4 in accordance with ASTM D610. At the shell, the exterior paint system is in good condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. Chalking at the shell was heavy and rated a 6 (ASTM D4214, 6). The paint thicknesses were found to range from 3 to 5 mils on the roof and 3 to 4 mils on the shell. The paint system was estimated to exhibit poor adhesion (ASTM D6677, 3A).

Some of the specific data collected follows:

Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
2222
NE
9 Exterior
9 S
Good
W
9 Tank Support
Exterior Good
Overall Condition
9 Shell Quadrant
86 8 86 8 66 68 8
Paint Defects
Roof Quadrant
SW
Poor
4 Exterior
2 4
2 Exterior Paint
ES
2 E
44 N
2 Fair
22 99
W
99 N
22 8
Delamination
Spot peeling
907
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

Page 4 ends

The total amount of corrosion on the roof was rated to be approximately 1 percent of the total surface area (ASTM D610, 6), and there was a moderate amount of rust staining present at the upper shell course from the roof, emanating from the faying surfaces at the roof structure.

The shell surfaces are covered with a heavy sediment and the lining was found to be in poor condition with areas of dark rust, pitting and lamellar exfoliation (CSI Corrosion Grades 2, 3, 4), especially within the mean water level segment of the shell. The total amount of corrosion on the shell was rated to be less than 10 percent of the total surface (ASTM D610, 4) with rust nodules and pitting observed. Widespread groupings of intact, medium dense blisters were observed (ASTM 714, 4/Dense).

The data collected from the inspection follows:

Rust areas (ASTM D610)
Rust spots (ASTM D610)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
22 Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Poor
2,3,4 2,3,4
Yes Yes
4/Dense 4/Dense 4/Dense 4/Dense
Roof Quadrant
66 S
2,3,4 2,3,4
Yes
WN E
Poor
E
Poor Interior
N
69 Interior
WN
69 Paint Defects/Overall Grade
6 Yes
4/Dense
S
6 Floor Quadrant
SW
Good
Shell Quadrant
2 4/Dense
2 Interior Paint
Interior
66 2
2,3 2,3 2,3
Yes
2,3
4/Dense
22 Yes
4/Dense
2 E
99 Above Water Condition Below Water Condition Good
908
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
Dive Inspection Video
Cut and paste the external link: https://photos.app.goo.gl/3QV1ETJaRjGvsaJD6 Discussion
The paint system on the exterior was found to be relatively thin, very weathered and in poor condition on the roof but in good condition on the shell. All surfaces of the roof have isolated spot rust and areas of peeling and the paint system was found to have significantly weathered from chalking. It was also noted that the underside of the vents have heavy corrosion up to and including some metal loss.

Chalking is the term for the powdery characteristic of an aged coating that may also have a faded finish. Chalking is a result of the natural breakdown of a paint system's binder when it is exposed to sunlight. The binder (or resin) degrades in ultraviolet light, which leaves behind the unbound pigment or chalk. Aside from a faded appearance, chalking can result in corrosion as the film weathers (thins) away through cycles of wind and rain. As the paint endures years of direct sunlight, it begins to weather away, which results in the paint no longer providing enough barrier protection from corrosion. 909
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
Cracking is the result of some form of stress within the coating system that extends through a complete layer of coating. The stress is often a result of some internal coating pressure or from some form of structural movement. The internal pressures can result from a shrinking film when it is applied too thick or if coating a coating does not have the elongation properties required to bridge existing breaks. Checking is related to cracking, but the coating breaks do not extend through the entire system.

Generally speaking, there are four possible approaches to maintenance coating work.

On this basis, it is recommended that the tank exterior roof paint system be removed and replaced within the next 1 to 2 years before any additional significant metal loss develops. The existing paint system at the shell appears to NOT be a suitable candidate for overcoating strategies, therefore, a full removal and replacement of the paint system is in order.

At interior surfaces, the tank lining system was found to have widespread dark corrosion above the highest water level (HWL) with lamellar and/or exfoliation corrosion common to the areas of the shell within the MWL. Some rafter flanges exhibit some minor section loss due to corrosion. A significant amount of corrosion was found below HWL with pitting and medium dense patches of broken and unbroken blisters. 910
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
Rust is a result of ferrous metal essentially converting itself back to its original state, iron ore. It takes a tremendous amount of energy to convert an ore into a usable metal.

These metals then try to naturally release this energy through the development of rust.

Isolated corrosion pits can develop within a coating system that may have only a few small breaks that were not corrected through periodic maintenance repairs. If the remaining, adjacent coating has excellent adhesion, it will inhibit undercutting corrosion. 911
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
As a result, the corrosion forces will have a tendency to concentrate on the exposed bare metal, which results in pitting. Pitting can be critical in some instances. The maximum corrosion rate for steel in fresh water is typically no more than 30 mils per year (MPY). As a result, the pitting can develop into a perforation if not repaired. If a thru-hole develops within a tank bottom, the isolated issue can develop into a much larger corrosion problem. Corrosion requires oxygen to advance, and the underside of the tank bottoms are considered a dead-air space. As a result, the bottom of tank floors are typically not coated. A perforation or thru-hole with even a small trickle of water will reintroduce oxygen into the environment creating active corrosion that is difficult to identify until the steel floor plate requires replacement.

The tank ventilation was found to have screening installed with gaps or penetrations. 912
Final Report - Maintenance Inspection
City of Santa Paula – Limoneria Reservoir
MKN Associates

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October 21, 2025
Recommendations
The following activities are recommended for remedial work:

Exterior
Within the next one to two years, remove and replace the exterior paint system. 1) This work should include cleaning all surfaces in accordance with SSPC’s Surface Preparation Standard No. 6, “Commercial Blast Cleaning” (SSPC SP-6) followed by 4-6 mils of an industrial epoxy primer and 3-5 mils of a polyurethane finish coat.
2) Test the paint system for heavy metals to determine if any special actions are required to protect workers and the environment during paint disturbance.

Interior
As soon as possible, remove and replace the interior lining. This work should include the following:
3) Remove and replace the lining system at all interior surfaces. This work should include cleaning all surfaces in accordance with SSPC's Surface Preparation Standard No. 10 "Near-White Metal Blast Cleaning" (SSPCSP10) followed by three 4 to 6 mil coats of an NSF Certified epoxy lining. 4) Caulk all crevices in the tank such as roof lap seams. 5) Anticipate the need for structural repairs (welding, grinding, etc.) NOTICE: This report represents the opinion of CSI Services, Inc. This report is issued in conformance with generally acceptable industry practices. While customary precautions were taken to ensure that the information gathered and presented is accurate, complete, and technically correct, it is based on the information, data, time, and materials obtained and does not guarantee a leak proof tank. 913
© Copyright CSI Services 2023
12 in
Shell
Caulking Roof No Columns
Two Shell Manways
Bolted Circles
Vent
Near Edge
No. & Type Roof Access
Yes
No
Tank Foundation
Two Screen Air Gap
N/A
Tank Piping
Ext Ladder Fall Prevent
Ext Ladder Satisfactory
Yes
Yes
One
Hatch Design
No. Roof Vents/Location
Shell Inlet and Outlet
20 in 12 in
YEs
Overflow Exterior Design
Drain Location
Water Level Indicator
12 in
The information reported was obtained using visual observations and testing believed to be accurate. The information reported represents the data obtained from the specific representative areas inspected, tested, and/or verified. This document shall only be produced in its entirety. 17 in
Tank Type
Contract No.

Erection Year
Roof Design
Height of Each Course
No. Roof Hatches/Location
Size of Roof Hatch
Six
Hatch
Scope
Yes
Number of Courses
Site Information
Diameter (feet) Yes
Client Contact:

Tank Owner/Client:

Tank Name:

City of Santa Paula
Limoneria
Rob Lepore
Dive Supervisor:

Steven Metcalf Jr
Josh Servera
Stub
Yes
Yes
Yes
Item Notes
Date of Last Inspection
Ladder
N/A
N/A
No
Steven Metcalf
Dive Tender
Dive Leader:
1 of
Completed By Metcalf
1 CSI Job No.

Page
240243
08/19/25 Tuesday
N/A
P.O. Box 801357, Santa Clarita, CA 91380
Water Agitator
No
Phone: 877.274.2422 (toll free) Date
Fax: 661.755.7628
www.CSIServices.biz
Field Water Tank Dive Inspection Report
Description
Interior Structural Characteristics
Roof Accessible
Overhead Power Lines
Water Depth
No
Tank Geometry
Pitched Roof
No. of Columns
None
34 Item
GPS Coordinates
Cross Street
Tank Location
Surrounding Site Dirt
Nearest Structures
Foothill Rd
Santa Paula CA

34.33722, -119.13180
Roof Structure Rafters and Center Column
I Beam
Item
Column Design
No
No
N/A
No. Interior Ladder
Outlet Design
Perimeter Fencing
Site secured on arrival
Data
Antenna on Tank
N/A
Item Data
No
Stub
Connections
Column Base Design
Bolted
Free Plate
Upper Center Column Dollar Plate CP System/Type
Inlet Interior Design
Overflow Design Stubs Barrier Walls
Capacity (gallons)
Exterior Structural Characteristics
1,000,000
Lining Type/Original
Item
Epoxy
Data
Unknown - Suspect 1950's
Item Data
on grade
Overflow Pipe Diameter
Flexible Pipe Coupling
Outlet Diameter
Inlet Diameter
6 Roof Rail Satisfactory
Height (feet) Roof Rail System
Center Roof Vent Size
Tank Profile
60 36
Roof Vent Sealed
Unknown Top of Ladder Rail Location
Type of Manways
No. Shell Manways
Diameter of Manways
Manway Cover Design
Welded Steel One
Round
Cylinder
Yes
Yes
One
Roof Tie-Off Present
Polyurethane
Tank Type Potable
N/A
Yes
Gravel
Exterior Vandal Deterrent
Miscellaneous Notes
Hatch
Construction Co. Unknown No
Maintenance Inspection
One Column
Roof Vent Design
Lining Type/Original
914
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© Copyright CSI Services, Inc. 2004
Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected of the paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

This condition identifies an area with
wholesale coating defects or corrosion
concerns that will typically require
significant removal and replacement of
the coatings in the area.

This condition identifies an area with
partial coating defects or corrosion
concerns that will require significant
rework.

Good
This condition is rated for areas without
any considerable coating defects or
corrosion. These surfaces are in a
condition that is typical for the age of the
coating system.

This condition identifies areas with
coating defects or corrosion that is
typically seen in one-year warranty
inspections. Typically, only minor spot
repairs are required.

Excellent
This condition is for areas without any
considerable coating defects or corrosion.

Typically, these surfaces are in a
condition that is better than expected for
the age of the system.

This condition identified areas that
typically are in perfect condition and
require no repair work.
942
Copyright CSI Services, Inc. 2004
Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust.

Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1 Rust Grade 0
Rust Grade Description
10 No rusting or less than 0.01% of surface rusted
9 Minute rusting, less than 0.03% of surface rusted
8 Few isolated rust spots, less than 0.1% of surface rusted 7 Less than 0.3% of surface rusted
6 Excessive rust spots, but less than1% of surface rusted 5 Rusting to the extent of 3% of surface rusted
4 Rusting to the extent of 10% of surface rusted
3 Approximately one-sixth of the surface rusted
2 Approximately one-third of the surface rusted
1 Approximately one-half of the surface rusted
0 Approximately 100% of the surface rusted
943
© Copyright CSI Services, Inc. 2004
Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

The edges of the
affected area are leaf
like and resemble the
separated pages of a
wetted book.
5 Structural Loss - This
condition involves
metal loss or failure
where components
will require structural
consideration
The photos depicted are examples and were not taken on this project. 944
© Copyright CSI Services, Inc. 2004
Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints
No .8 No. 6 No .4 No. 2

Dark Colored Paints
No .8 No. 6 No .4 No. 2
945
© Copyright CSI Services 2004
Chart 5 - Adhesion Rating The figures below depict the photographic standards and criteria referenced in ASTM D3359 “Standard Test Method for Evaluating Adhesion by Tape Test” and ASTM D6677 “Standard Test Method for Evaluating Adhesion by Knife.” Both Standards are used to assess the condition of a paint system for life-cycle projections. It is also used to evaluate an existing paint system’s ability to withstand the added stress that any overcoating strategies can create. Depending upon the thickness of the paint system, ASTM D3359 has two different test methods. The rating criteria for both standards follow:

ASTM D3359
Method A Method B
Rating Observation
Surface of X-cut from
which flaking/peeling has
occurred
Rating Percent Area
Removed
Surface of cross-cut area from
which flaking has occurred for
six parallel cuts and adhesion
range by percent
5A
No peeling or
removal None 5B 0% none
4A
Trace peeling or
removal along
incisions or their
intersection
4B Less than
5%
3A
Jagged Removal
along incisions up
to 1/16” on either
side
3B 5 – 15%
2A
Jagged removal
along most of
incisions up to 1/8”
on either side
2B 15 – 35%
1A
Removal from most
of the area of the X
under the tape 1B 35-65%
0A
Removal beyond
the area of the X 0B Greater than
65%
ASTM D6677
Rating Description
10 Fragments no larger than ” x ” can be removed with difficulty 8 Chips up to ” x ” can be removed with difficulty
6 Chips up to ” x ” can be removed with slight difficulty 4 Chips larger than ” x ” can be removed with slight pressure 2 Once coating removal is initiated by knife, it can be peeled at least ” 0 Coating can be peeled easily to length greater than ” 946
© Copyright CSI Services, Inc. 2004
Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8).

Few Medium Medium Dense Dense
Blister
Size No. 2
Blister
Size No. 4
Blister
Size No. 6
Blister
Size No. 8
947

Re: Peck Reservoir, City of Santa Paula
Dear Luis:

Please find attached the final report for the evaluation that was completed on the above referenced tank. Also attached is our invoice.

Thank you for your business and please let me know if you have any questions or comments about our findings. I can always be reached by cell at 951.609.6991 or by email at [email protected].

Sincerely,
CSI Services, Inc.

N. Randy Gordon, PCS
Technical Services Manager
948
P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422
Final Report
Maintenance Inspection
Peck Reservoir
City of Santa Paula
Prepared for:

Luis Garcia
MKN Associates
121 N. Fir Street, Unit G
Ventura, CA 93001
Prepared by:

Consulting Evaluations Tank Diving Inspection
949
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates
Page i
Hawaiian Office: P.O. Box 671, Aiea, HI 96701
Northern California Office: P.O. Box 371, Sonoma, CA 95476 Coating Specialists and Inspection Services, Inc.

Consulting Evaluations Tank Diving Inspection
Table of Contents

Introduction ..……………………………..………….………… Page 1

Discussion…..…………………………………………..……… Page 5
Recommendations………………………….....….……...…… Page 8

Attachments

950
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates

Page 1 ends

October 31, 2025
Introduction
MKN Associates authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on the City of Santa Paula’s Peck Reservoir located near 601-699 N Peck Rd, Santa Paula, CA 93060. This report documents the findings of the inspection and services performed.

The field-work was completed on August 19, 2025 by a team primarily comprised of Josh Severa, Steven Metcalf and Steven Metcalf Jr. The exterior shell observations were made mostly from grade level, while the exterior of the roof was examined closeup. The interior inspection was carried out with the tank’s water level at approximately 16 feet using special underwater diving equipment and techniques. Steve Metcalf was the site supervisor and the lead diver. Mr. Randy Gordon, Technical Services Manager, reviewed the results of the field data and prepared recommendations for maintenance work. Mr. Gordon has over 35 years of experience through the evaluation of thousands of storage tanks and other industrial structures. He is certified as an SSPC Protective Coating Specialist (PCS) and NACE/SSPC Level 3 Coating Inspector.

The interior lining is in good overall condition with no wholesale defects. The sacrificial anode CP system is preventing more advanced forms of corrosion from developing below the HWL. At this juncture, it is recommended that the tank be placed back on a 3 to 5 year maintenance inspection schedule as recommended by AWWA and continue to make patch repairs to the lining which will extend the overall lifespan if the system. 951
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates

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October 31, 2025
Background
The Peck Reservoir is a welded steel on grade structure that was constructed in 1954.

The tank is approximately 60 feet in diameter by 24 feet high providing a nominal capacity of 500,000 gallons and is located near 601-699 N Peck Rd, Santa Paula, CA 93060. It is the only tank at this hillside site.

The tank shell has three courses that are connected to a conical roof with rafters and one center column. The tank has one center vent, one roof hatch, and two monobolt shell manways. There is an interior ladder and one exterior ladder. The exterior ladder has fall a protection device and a vandal deterrent screen. The tank rests on an oilsand foundation with a gravel grade band and is not seismically anchored. There is an internal sacrificial anode cathodic protection (CP) system associated with this tank. The tank has a water level sensor but no mechanical water level indicator.

It is believed that the interior lining is a 2nd generation system. The interior steel surfaces, including the roof and roof support members, are coated with a multicoat thinfilm epoxy. The exterior roof, shell, and appurtenances are painted with what appears to be a polyurethane system. The internal roof lap seams are not caulked.

Field Evaluation
The purpose of this survey was to assess the condition of the existing coatings and recommend maintenance coating work, where needed. The evaluation mainly involved visual observations but also involved various testing procedures. Photographs and video were taken to document the field inspections, and a photo summary and narrated video are included within this report.

Where applicable, the characteristic or stage of corrosion was determined in accordance with CSI Corrosion Grade criteria (Chart 3). The degree of paint chalking 952
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates

Page 3 ends

October 31, 2025
was determined in accordance with ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Test Method D659, Method C (Chart 4).

Exterior
Close-up visual examination of the coating was limited to the first (lowest) shell course, upper shell areas adjacent to the ladder, and the roof. The exterior paint on the roof is in good condition with minimal chalking (ASTM D4214, No. 8). Dark rust (CSI Corrosion Grade 2) was present in areas that had been mechanically damaged from operations or vandalism and in areas where paint was peeling. The amount of rust on the roof was less than 0.03 percent of the overall surface area and rated a 9 in accordance with ASTM D610. At the shell, the exterior paint system is in good condition and was rated a 9 (ASTM D610) with less than 0.03 percent of the total surface area impacted by corrosion. The paint thicknesses were found to range from 5 to 6 mils on the roof and 7 to 8 mils on the shell. The paint system was estimated to exhibit satisfactory adhesion (ASTM D6677, 4A) at the shell and satisfactory adhesion (ASTM D6677, 5A) at the roof.

Some of the specific data collected follows:

Rusting at crevices
Corrosion Grade
Rust spots (ASTM D610)
Chemical staining
Checking (ASTM D660)
Cracking (ASTM D661)
Chalking
2222
NE
9 Exterior
9 S
Fair
W
9 Tank Support
Exterior Fair
Overall Condition
9 Shell Quadrant
88 8 88 8 88 68 8
Paint Defects
Roof Quadrant
SW
Fair
9 Exterior
2 9
2 Exterior Paint
ES
2 E
99 N
2 Fair
22 99
W
99 N
22 8
Delamination
Spot peeling
953
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates

Page 4 ends

The data collected from the inspection follows:

Rust areas (ASTM D610)
Rust spots (ASTM D610)
Delamination
Spot peeling
Rusting at crevices
Rust staining
Corrosion Grade
Pitting (Estimated Deepest Mils)
Pitting (Estimated Amount)
Blistering (ASTM 714) Size/Density
Cracking (ASTM D661)
Good
22 Yes Yes
Roof Quadrant
99 S
22 Yes
WN E
Good
E
Good Interior
N
99 Interior
WN
99 Paint Defects/Overall Grade
9 Yes
S
9 Floor Quadrant
SW
Good
Shell Quadrant
Interior Paint
Interior
99 2
Yes
2 Yes
E
99 Above Water Condition Below Water Condition Good
954
Final Report - Maintenance Inspection
City of Santa Paula – Peck Reservoir
MKN Associates

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Santa Paula City CouncilJune 17, 2026

Santa Paula City Council
June 17, 2026