Atch 10 2021.05.07_GRCA230561_DVTankRehab_Amendment002_0002.pdf

GRAND CANYON NATIONAL PARK

GRAND CANYON, ARIZONA

Desert View Tank Rehabilitation

PMIS 230561

Amendment 002

NATIONAL PARK SERVICE

INTERMOUNTAIN REGION

May 5, 2021

1) Other Attachments – Posted via Amendment 001 are the Pre-Bid Sign-in Sheet, GRCA

Pruning Guidelines, and project Submittal Register.

2) Attachments included in this amendment –

i. 2021 Desert View Tank Report w/ Pictures

ii. Texas-Aquastore Exterior Platform Kit

3) Contractor Representative – Contractor may elect to have one representative onsite to cover multiple roles (safety, superintendent, quality control, environmental manager/coordinator).

4) Tank Information

a. Tank Manufacturer Contact Information:

i. Wick Baker, 602-620-2206, wick@bordermarketing.com

ii. John Pappalardo, 817-832-9794, jp@texas-aquastore.com

iii. Chad Callahan (technical), 903-870-5000 / 903-624-2805, chad@texas-aquastore.com

b. Tank was installed in 2000s. There is no lead-based paint.

c. Tank is typically one-half to three-quarters full.

d. Tank is required to remain in service during the work.

e. There are two existing sacrificial anodes inside the tank, believed to be magnesium. Refer to page 104 of the specifications, line 62 of the “Tank Parts

List” (bill of materials).

f. Tank access is through the top of the tank via the roof hatch.

5) Construction Water

a. Non-potable water is available at Grand Canyon Village.

b. Potable water is available at the Desert View location.

6) Vegetation Removal – Some tree pruning may be necessary when relocating the ladder.

Reference photo on Drawing C3. Follow the attached GRCA Pruning Guidelines. Tree removal is not permitted.

7) Sediment Removal –

a. When vacuuming the sediment out of the tank: properly store, remove, and dispose offsite at an approved landfill location. Contractor is not permitted to dispose sediment at the Park.

b. Estimated sediment depth less than one (1) inch. Refer to inspection report.

Volume can be determined using a tank diameter of forty (40) feet.

c. It is unknown if sediment removal has been done prior to this scope.

8) Exterior Seams Re-Sealing

a. Sealant Product Manus Sealer No. 98 may be discontinued; the newer product is

Manus 75 A-M. An equal single component urethane sealer product may be submitted for approval, or as recommended by the Manufacturer.

mailto:wick@bordermarketing.com mailto:jp@texas-aquastore.com mailto:chad@texas-aquastore.com mailto:chad@texas-aquastore.com

b. For estimated seam lengths, dimensions shown on drawing C2 are taken from the original shop drawings (see specification PDF pages 87-140). Roof panel seams can be estimated from the original shop drawings, p 112, 116, and 135 show the roof panel layout

9) Specifications Not Applicable to This Project

a. Specification 01 50 00 3.2.A.2 – Temporary water system.

b. Specification 01 50 00 3.2.B – Effluent Removal.

c. Specification 33 13 02 1.1.A – Installing a new interior ladder and re-sealing interior tank seams.

d. Page 141 of Specification Package, “Glass-Fused-to-Steel Bolted Water Tank, Tank Maintenance Repair”

i. This is a specification from the manufacturer is intended to show materials used for repair and maintenance. DISREGARD 1.1 “Scope of Work” on this document. However, Contractor is responsible for replacing bolt caps

(nuts) as necessary because of improvements shown on the drawings, such as ladder relocation, platform fastening, railing attachments, etc.

10) Fastening Accessories to the Tank

a. Texas-Aquastore has a standard manway platform kit that can be used in conjunction with the drawing in this project (reference attachment). It is recommended that personnel do not step on or over the roof access hatch. GRCA would be amenable to this smaller platform footprint as long as the intent of the project is met, and OSHA guidelines are followed.

b. Manufacturer recommends replacing existing tank bolts with correct length bolts on the brackets that attached to the tank wall and with the appropriate seals for mounting ladders, platform, and railings. Drilling new holes on panels is not permitted.

11) Permits – ADEQ permitting is not required for the scope of this project.

Grand Canyon National Park

Water Storage Facility 2021 ROV Inspection February 2021

US UNDERWATER

123 Sentry Drive • Mansfield, TX 76063 800.860.2178 www.usunderwaterservices.com http://www.usunderwaterservices.com/

CONSOR Engineers, LLC dba U.S. Underwater | 123 Sentry Drive, Mansfield, TX 76063 P: 817-447-7321, F: 817-447-0021, Toll: 800-860-2178

Statement of Certification

Grand Canyon National Park

Location: Grand Canyon Village, AZ

February 2021

This form certifies the inspections were completed on the above date for the facilities listed below:

[1] 153,000 Gallon Ground

U.S. Underwater certifies the work was completed in accordance with the American Water Works Association’s [AWWA] current standards [ANSI/AWWA c652-92] regarding disinfection procedures when conducting underwater activities in potable water storage facilities. All equipment used is designated for potable water use only.

Rachel Potter Director of Sales & Marketing CONSOR Engineers LLC, dba U.S. Underwater

Report Proposal March 10, 2021

Grand Canyon National Park P.O. Box 2168 Brenna White Mansfield, TX 76063 S Entrance Rd 1 800-860-2178 Grand Canyon Village, AZ 86023 P 817-447-7321 928-638-7906 F 817-447-0021 brenna_white@nps.gov aspinks@consoreng.com

U.S. Underwater Representative

Project

Ashleigh Spinks

The below recommendations are based on the results of the inspection and to comply with OSHA and/or AWWA standards. Please contact your U.S. Underwater Account Manager for a customized proposal.

Inspection Capacity Type Name Measurements

#1 153,000 Ground Desert View H: 15.5’ D: 42’

Label manway access hatch as a ‘confined space entry’ area Label water access hatch as a ‘confined space entry’ area Remove the 1/16”-1/4”, 100% coverage, of sandy silt sediment and metal tubing from the floor plates

Rust

Grades A

Description

Graphical Representation

No rusting or less than 0.01% of surface rusted

Unnecessary

Minute rusting less than 0.03% of

8B

Few isolated rust spots less than

0.1% of surface rusted

Less than 0.3% of surface rusted

6C

Extensive rust spots but less than

Rusting to the extent of 3% of

4D

Rusting to the extent of 10% of

3E

Approximately on sixth of the surface rusted 16%

Approximately one third of the surface rusted 33%

Approximately one half of the surface rusted 50%

References

Standard Method of Evaluating Degree of Rusting on

Painted Steel Surfaces – SSPC-Vis 2-82 & ASTM D 610-85 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:

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

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

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

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

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.

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.

1% of surface rusted

Ground Tank/Standpipe/Clearwell Inspection Grand Canyon National Park Inspection #1 / Desert View Complete

Failed items 3

Inspection Title Grand Canyon National Park Inspection #1

Client Specific Tank Name Desert View

Client Grand Canyon National Park

Job Number 206237.00

Prepared by Rov Two

Conducted on 9th Feb 2021 10:41 AM CST

Recommended Maintenance 3 failed

External Inspection

Was Manway Access Hatch Labeled 'Confined Space?' No

Recommend a 'confined space entry' placard be installed

External Inspection

Was Water Access Hatch Labeled 'Confined Space?' No

Recommend a 'confined space entry' placard be installed

Internal Inspection

Is Facility Free of Sediment/Debris? No

Recommend the 1/16"-1/4", 100% coverage, of sandy silt sediment and metal tubing be removed from the floor

External Inspection 2 failed

Reference Photo of Facility

Photo 1

Facility Type Ground

Facility Construction Metal- Bolted

Capacity 153K

Height 15.5’

Diameter 42’

Does Facility Extend Underground? No

Tank ID Plate? Yes

Tank ID Plate Photo

Photo 2

Tank Builder AquaStore

Year Built N/A

Lower Level

Condition of Intruder Protection Fence Good

Condition of Foundation Good

Photo of Foundation

Photo 3 Photo 4 Photo 5 Photo 6 Photo 7 Photo 8

Water Level Indicator Type(s) Manual/Visual

Electronic

SCADA

Condition of Water Level Indicator(s) Good

Photo of Water Level Indicator

Photo 9 Photo 10 Photo 11

Condition of Overflow Good

Does Overflow Extend to Ground/Accessible? Compliant

Does Overflow Flapper Seal? Compliant

Photo of Flapper

Photo 12 Photo 13 Photo 14

Overflow Diameter 8”

Condition of External Plumbing N/A

Condition of Sidewall Plates Good

Photo 15 Photo 16

Condition of Sidewall Protective Coating (SSPC Rating) 9

Condition of Side Manway Access Hatch Good

Photo of Side Manway Access Hatch

Photo 17

Size of Manway Access Hatch 30”

Was Manway Access Hatch Labeled 'Confined Space?' No

Recommend a 'confined space entry' placard be installed

Condition of External Ladder Good

Photo of External Ladder

Photo 18 Photo 19 Photo 20 Photo 21 Photo 22

Width of External Ladder 16”

Diameter of Rung 1 1/4”

Length of External Ladder 10’

Length of Standoff 9 1/2”

Condition of Intruder Protection Door Good

Photo of Intruder Protection Door

Photo 23

Condition of Fall Protection System Good

Photo of Fall Protection System

Photo 24

Upper Level U Photo of Roof Plates

Photo 25 Photo 26 Photo 27

Condition of Roof Plates Good

Condition of Roof Coating (SSPC Rating) 9

Condition of Anode Plates N/A

Photo of Water Access Hatch

Photo 28 Photo 29 Photo 30

Condition of Water Access Hatch Good

Size of Water Access Hatch 30”

Was Water Access Hatch Labeled 'Confined Space?' No

Recommend a 'confined space entry' placard be installed

Was Water Access Hatch Locked? Yes, Lock in Good Condition

Type of Roof Vent Mushroom Shape

Photo of Roof Vent

Photo 31 Photo 32 Photo 33

Condition of Roof Vent Good

Vent Circumference 24” square

Condition of Vent Screen Compliant

Internal Inspection 2 failed

Condition of Water Access Ladder No Ladder

Recommend a water access ladder be installed

Condition of Roof Supports Good

Condition of Water Level Indicator System Good

Condition of Overflow Good

Condition of Roof Plates Good

Condition of Roof Plates (SSPC Rating) 10

Condition of Cathodic Protection N/A

Condition of Sidewall Plates Good

Condition of Sidewall Plates (SSPC Rating) 8

Condition of Side Manway Access Good

Condition of Internal Plumbing Good

Condition of Floor Plates N/A

Condition of Floor Plates (SSPC Rating) N/A

Does Tank Have Baffles? No

Is Facility Free of Sediment/Debris? No

Recommend the 1/16"-1/4", 100% coverage, of sandy silt sediment and metal tubing be removed from the floor

Photo 34 Photo 35 Photo 36

Sediment/Debris Type Sandy Silt

Other Debris

Description of Debris Piece of square tubing

Sediment Depth 1/16”-1/4”

Percentage of Sediment Coverage 100%

Level of Staining Inside Facility Light

Clarity of Water Good

Quality of Water Good

Water Temperature Cool

Water Depth (Maximum) 15.5’

Water Depth (Actual) 14’

Additional Notes The overall condition of the seams are in good condition and no repairs are recommended

Inspector

Josh Boatright 9th Feb 2021 8:21 PM CST

UT Readings for Sidewall Plates in Inches:

1) .125

2) .125 3) .125 4) .125 5) .125 6) .125 7) .125 8) .125

9) .125

10) .125 11) .125 12) .125 13) .125 14) .125 15) .125 16) .125

Northside

Southside

Appendix Appendix

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