8-Attachment F - Oliver Tank Inspection Report.pdf

Oliver Reservoir Eastern Municipal WD

Report of Findings From the

Diving Operations

Conducted on

December 8, 2021 by

711 Market Street, Klamath Falls, OR 97601, (800) 229-6959 www.divingservices.com

Technology

DIVING SERVICES

LiquiVision http://www.divingservices.com/

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December 8, 2021

John Dotinga Eastern Municipal WD 2270 Trumble Rd.

Perris, CA 92572

Following is the report of findings during the underwater work conducted on your reservoir.

It will focus on issues of concern or areas that need attention. In order to see a complete and detailed inspection, please view each video.

Color images of all plumbing fixtures, components and areas of concern were taken via underwater digital camera. The images should give you a clear view of the conditions described.

The video may give you another view and a clearer understanding of any area that you may wish to look at more closely.

METHODOLOGY:

Disinfection of All Equipment With 200ppm+ Chlorine Solution Immediately Prior to Entering System: This process prevents contamination of the water supply. All LVT equipment was properly disinfected prior to entering the potable water system.

Full-Time Voice Communication between surface and Diver: The system allowed for constant communication between the diver, and all surface personnel. In addition, customers were able to communicate with the diver at any time. For purposes of a more efficient inspection, cleaning, and repair program, that enabled the diver to immediately discuss any observations he made inside the reservoir.

Full-Time Live High Resolution Color Video: Allowed for constant viewing of the diver's work and observations. This also enabled the district personnel to view what the diver in the reservoir was witnessing.

Underwater Inspection of

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TERMINOLOGY:

When describing the features or areas of interest inside the reservoir, an image number is placed next to the description that corresponds with the inspection findings. The diagram is shown in a view looking from the top down. The entry hatch is referred to as the 12:00 o’clock position.

Following the diagram are pictures of the pertinent areas of the reservoir and the locations where the pictures were taken. Each picture is descript and numbered.

The standards used to evaluate the condition of the reservoir include: Standard Method of Evaluating Degree of Rusting on Painted Steel Surfaces – SSPC-Vis 2-82 & ASTM D 610-85 NACE Standard RP0196-96 & RP0388-2001 or Condition of Concrete In-service – ACI 201.1R-92.

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OVERVIEW OF RESERVOIR INSPECTED:

Customer Name: Eastern Municipal WD Reservoir Name: Oliver Reservoir Reservoir

Manager: John Dotinga Construction: Welded Steel

Job Number: CA126521R28T0 Capacity (gal.): 6,300,000

Date of Inspection: December 8, 2021 Diameter or L x W: 180'

Report Writer: John Budden Height: 33'

Diver: Mark Budden Floor Square FT: 25446.2

Tender: Jacob Budden Date Built: unknown

N/A –not applicable Excellent (Ex.) –like new condition, no repairs needed. Good – Cosmetic only problems, repairs if wanted. Fair-Minor problems, repairs needed, not immediate. Poor –Major problems, structural or like, immediate repairs needed.

1. Rust Grades

Grades % of Surface Rusted Description

10 0% - 0.01% No rusting or less than 0.01% of surface rusted

9 0.01% - 0.03% Minute rusting, less than 0.03% of surface rusted

8 0.03% - 0.1% Few isolated rust spots, less than 0.1% of surface rusted

7 0.1%- 0.3% Less than 0.3% of surface rusted

6 0.3% - 1% Extensive rust spots, but less than 1% of surface rusted

5 1% - 3% Rusting to the extent of 3% of surface rusted

4 3% - 10% Rusting to the extent of 10% of surface rusted

3 10% - 16% Approximately one sixth of the surface rusted (16%)

2 16% - 33% Approximately one third of the surface rusted (33%)

1 33% - 50% Approximately one half of the surface rusted (50%)

0 50% - 100% Approximately 100% of the surface rusted

2. Concrete Deformities

Unable to Evaluate

Good Condition

Cracks Blistering Chalking De- Lamination

Pitting Popouts Scaling Spalling Warping

UE GC CK BL CH DL PT PO SC SP WA

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RECOMMENDATIONS:

Recommendation

Estimated Time - Hrs.

Repair coating failure on interior fixtures, floor and walls. Repairs below the water line can be accomplished utilizing divers, the proper tools and specially formulated two-part epoxy.

Please contact our sales office for an estimate.

Perform a regular cleaning, inspection and repair cycle every 2-3 years in order to ensure superior water quality and proper maintenance of coating condition and appurtenances is performed.

Please contact our sales office for an estimate.

Other

Total Estimated Hours

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Reservoir Diagram

20 1 2 19 3

21 36 30 33 32 22 34 25r 48 23r

51c

15,17 26,27,49,50 28,29

14 47 35 4 37f 38 45 52c 13 44f 5

12 53c

24r

10,11 42 40f

8 7 6

Drawing Not to Scale

Entry Hatch

Overflow

Telemetry

Common Inlet/Outlet

Man Entry

Water Tap

Drain/Scour

Cathodic Protection Anode

Air Vent

12:00

1:00

2:00

3:00

4:00

5:00

6:00

7:00

8:00

9:00

10:00

11:00

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Image #1

Exterior Base

Condition:

Concrete Deform3 GC.

Description:

Exterior Base appeared to be in good condition with no concrete problems.

Image #2

Exterior Wall

Rust Grade1 8.

Exterior Wall appeared to be in good condition with a minor amount of corrosion.

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Image #3

Rust Grade1 9.

Water Tap appeared to be in

Image #4

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Image #5

Image #6

Man Way

Man Way appeared to be in

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Image #7

Image #8

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Image #9

Water Tap appeared to be in

Image #10

Overflow appeared to be in good condition with a minor amount of corrosion.

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Image #11

Image #12

Drain

Drain appeared to be in good

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Image #13

Image #14

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Image #15

Telemetry Penetration

Telemetry Penetration appeared to be in good condition with a minor amount of corrosion.

Image #16

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Image #17

Telemetry

Image #18

Stairs

Stairs appeared to be in good

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Image #19

Image #20

Entry Hatch

Entry Hatch appeared to be in

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Image #21

Capped Off Penetration

Capped Off Penetration appeared to be in good condition with a minor amount of

Image #22

Telemetry Penetration

Telemetry Penetration appeared to be in good condition with a minor amount of corrosion.

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Image #23

Roof

Rust Grade1 7.

Roof appeared to be in good

Image #24

Roof 6:00

Roof appeared to be in fair

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Image #25

Roof 11:30

Roof appeared to be in fair

Image #26

Vent Center

Vent appeared to be in fair

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Image #27

Vent Center

Vent appeared to be in fair

Image #28

Vent

Rust Grade1 10.

Vent appeared to be in excellent condition with no signs of corrosion

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Image #29

Vent

Rust Grade1 10.

Vent appeared to be in excellent condition with no signs of

Image #30

Landing

Landing appeared to be in fair

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Image #31

Floor

Floor appeared to be in good

Image #32

Wall

Wall appeared to be in good

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Image #33

Reference Cell

Image #34

Cathodic Protection Anode

There was approximately 98% of the anode remaining.

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Image #35

Mixer

Image #36

Water Tap was in good condition. There was a minor amount of rust occurring at the penetration.

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Image #37

Image #38

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Image #39

Image #40

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Image #41

Image #42

Water Tap appeared to be in fair

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Image #43

Image #44

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Image #45

Image #46

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Image #47

Altitude Port

Altitude Port appeared to be in fair condition with a minor

Image #48

Inlet / Outlet

Inlet / Outlet appeared to be in

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Image #49

Column

Column appeared to be in good

Image #50

Column

Column appeared to be in good

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Image #51

Ceiling

Ceiling appeared to be in good

Image #52

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Image #53

Image #54

Sediment

There was approximately 1/16” of sediment removed from the floor.

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REFERENCES:

Standard Method of Evaluating Degree of Rusting on Painted Steel Surfaces

– SSPC-Vis 2-82 & ASTM D 610-85 (1989)

The graphical representations show examples of area percentages, which may be helpful in rust grading.

The use of photographical reference standards requires the following precautions:

1. Some finishes are stained by rust. This staining must not be confused with the actual rusting involved.

2. Accumulated dirt or other material may make accurate determination of the degree of rusting difficult.

3. Certain types of deposited dirt that contain iron or iron compounds may cause surface discoloration that should not be mistaken for corrosion.

4. It must be realized that failure may vary over a given area and discretion must therefore be used in applying these reference standards.

5. In evaluating surfaces, consideration shall be given to the color of the finish coating, since failures will be more apparent on a finish that shows color contrast with rust, such as white, than on a similar color, such as iron oxide finish.

6. The photographic reference standards are not required for use of the rust-grade scale since the scale is based upon the percent of the area rusted and any method of assessing area rusted may be used to determine the rust grade.

Rust Grades Description Graphical Representation

No rusting or less than 0.01% of surface rusted Unnecessary

Minute rusting, less than 0.03% of surface rusted

Few isolated rust spots, less than 0.1% of surface rusted

Less than 0.3% of surface rusted

Extensive rust spots, but less than 1% of surface rusted

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Rusting to the extent of 3% of surface rusted

Rusting to the extent of 10% of

Approximately one sixth of the surface rusted (16%)

Approximately one third of the surface rusted (33%)

Approximately one half of the surface rusted (50%)

Approximately 100% of the

Unnecessary