Water Tank 2020 inspection.pdf

USDA-ARS JWDSRC

P.O. Box 225

Stoneville, MS 38776

RE: Stoneville, MS

200,000 Gallon EWT

July 16, 2020

Mr. Roger Bright

Engineer

(662) 686-3072

Job No. 320350

July 16, 2020

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank is secured with fencing. There is no signage on the fence. We recommend posting a Warning, Tampering With This Facility is a Federal Offense (US code title 42, section 300i-1) sign and a No Trespassing sign.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank foundations are properly graded and in compliance with AWWA D100-11; 12.7.1 Height aboveground.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show two (2) examples of the five (5) foundations, which appear to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank is electrically grounded for lightning protection as required by OSH Act of 1970 Section 5 and appears to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of one (1) of the twelve (12) anchor bolts. The struc-tural integrity of the anchor bolts should be maintained to withstand 100 mph winds blowing from any direction as required by AWWA D100-11; 3.8: Anchor-age. We recommend cleaning the area around the anchor bolts, tightening the anchor nuts to specifications, then tack welding on the circumference of the nut-to-base plate connections and the bolt-to-nut connections to eliminate loosen-ing.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the existing riser drain valve, which appears to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the 18” X 24” elliptical riser manway, which is in compliance with AWWA D100-11; 5.4.4: Steel riser manhole and OSHA 1910.146(c)(2) Confined spaces.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show the 6” overflow pipe system, which is equipped with a flapper valve as required by AWWA D100-11; 5.3: Overflow. We recommend installing a new screen on the existing overflow pipe elbow.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Tower access ladder in above photos is 16” wide in compliance with OSHA

1910.23 Ladders and AWWA D100-11; 5.4.2: Ladders. Notice the safety cable appears to be defective. We recommend installing a new cable type ladder safety device and posting a Fall Protection Required sign at the base of the ladder.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the windage rods, which are in tune and appear to be properly adjusted.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the strut end connections. We recommend rein-forcing the strut ends by welding.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the riser pipe and bowl connection, which appears to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank balcony is equipped with a 42” high compliant handrail system for fall protection as required by OSHA 1910.28(b)(1). The handrail sys-tem is equipped with an intermediate rail, toeboard and a swing gate at the opening in the handrail at the junction of the tower access ladder and structural girder.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows where water is ponding on the balcony floor, causing deterioration of the paint and steel. We recommend drilling additional weep holes in the bal-cony floor to prevent ponding of water.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the 24” primary shell manway, which is in compli-ance with OSHA 1910.146(c)(2) Confined spaces.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Primary interior bowl access ladder is 16” wide in compliance with OSHA

1910.23 Ladders and AWWA D100-11; 5.4.2 Ladders.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the 30” secondary shell manway, which is in com-pliance with OSHA 1910.146(c)(2) Confined spaces.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Secondary interior bowl access ladder is 16” wide in compliance with OSHA

1910.23 Ladders and AWWA D100-11; 5.4.2 Ladders.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the posthead connections. The postheads secure the column legs to the tank shell and support the tank's live and dead load. The postheads have been welded around the circumference of the posthead-to-shell connections for reinforcement and appear to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank is not equipped with a liquid level indicator. We recom-mend installing a float-type liquid level indicator.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Shell-to-knuckle roof access ladder in above photo is 16” wide in compliance with OSHA 1910.23 Ladders and AWWA D100-11; 5.4.2 Ladders. Notice the safety cable is not properly adjusted. We recommend readjusting the cable type ladder safety device.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank roof edge is not equipped with a required handrail system for fall protection. OSHA 1910.28(b)(1)(i) states, “...the employer must ensure that each employee on a walking-working surface with an unprotected side or edge that is 4 feet (1.2 m) or more above a lower level is protected from falling by one or more of the following: 1910.28(b)(1)(i)(A) Guardrail systems.” We rec-ommend installing an OSHA compliant 42” high handrail system around the cir-cumference of the tank roof, complete with intermediate rail, toeboard and a swing gate at the junction of the shell-to-knuckle roof access ladder and tank roof.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the 24” primary roof hatch, which is in compliance with AWWA D100-11; 7.4.3 Roof openings and OSHA 1910.146(c)(2) Confined spaces.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Primary interior access ladder in above photo is 16” wide in compliance with OSHA 1910.23 Ladders and AWWA D100-11; 5.4.2 Ladders.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the condition of the 30” secondary roof hatch. Roof openings on this tank require the following to be in compliance with AWWA D100-11; 5.4.3 Roof openings and OSHA 1910.146(c)(2) Confined spaces.

We recommend:

Post Confined Space Entry sign

We further recommend installing an OSHA compliant interior access ladder complete with standoffs every 10' on center, and a cable type ladder safety de-vice at the secondary roof hatch.

*In cold climates it’s up to the owner’s discretion on placement of internal ladders.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show the existing 18” roof vent, which appears to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show the tank exterior coating system. The overall exterior coating sys-tem appears to be in good condition. We recommend pressure washing the tank exterior with biodegradable detergent injection (minimum 3,500 psi at 3.0 gpm), then re-evaluating the tank exterior at next inspection cycle.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the tank interior. A temperature difference between the water in the top and bottom of a tank, even as little as 1-2 degrees Fahrenheit, is an indi-cation of thermal stratification and the tank water not being completely mixed.

Incomplete mixing would result in short-circuiting, and localized increase in wa-ter age would develop inside the tank. This typically leads to water quality prob-lems, such as loss of residual, DBP spikes, HPC spikes, bacteria regrowth, for-mation of bio-film, changes in pH and dissolved oxygen. We recommend in-stalling a mixing system. Electrical work to be done by others if required.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show sediment in the tank. We recommend performing a dry interior cleanout in order to prevent contamination issues associated with excessive sediment buildup.

This work should be performed on an emergency basis.

*Please note price for interior cleanout is based on removing 1” – 3” of sediment. Any additional accumulation discovered will be removed in the amount of $300 per hour. In the event the tank has to be drained, tank will need to be drained by the owner, prior to our arrival.

We further recommend installing a passive cathodic protection system.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photo shows the riser pipe opening, which is equipped with a safety grill as re-quired by AWWA D100-11; 5.1.1: Safety grill and OSHA 1910.28, and appears to be in good condition.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Interior riser access ladder in above photo is 16” wide in compliance with OSHA

1910.23 Ladders and AWWA D100-11; 5.4.2: Ladders.

USDA-ARS JWDSRC

RE: Stoneville, MS

200,000 Gallon EWT

Job No. 320350

Photos show the condition of the interior coating system. We recommend sand-blasting all rusted and abraded interior areas to SSPC-SP10 (near white), and brush blasting all remaining interior areas to SSPC-SP7; then applying one (1) spot coat of epoxy primer to all areas sandblasted to #10, stripe coating all weld seams, and applying epoxy to the entire tank, to achieve 8 to 10 mils of total dry film thickness. Total mil thickness will include a combination of the existing and new coating.

USDA-ARS JWDSRC

P.O. Box 225

Stoneville, MS 38776

July 16, 2020

Mr. Roger Bright

Engineer

(662) 686-3072

ELEVATED TANK INSPECTION REPORT

JOB NO: INSPECTOR: Jacob Groth (BD)

TANK OWNER: USDA-ARS JWDSRC

OWNER’S REPRESENTATIVE: Mr. Roger Bright

TITLE: Engineer

MAILING ADDRESS: P.O. Box 225 Stoneville, MS 38776

PHYSICAL ADDRESS: 141 Experiment Station Road Stoneville, MS 38776

CITY, STATE: ZIP: Stoneville, MS 38776 COUNTY: Washington County

TELEPHONE: (662) 686-3072 FAX: Not Provided

LOCATION OF TANK: 111 Experiment Station Road Stoneville, MS 38776

ORIGINAL CONTRACT NO: E5028 YEAR BUILT: 2001

ORIGINAL MANUFACTURER: Caldwell Tank Inc. CAPACITY: 200,000 Gallon

DATE OF LAST INSPECTION: August 28, 2013 TYPE: Potable

TYPE CONSTRUCTION: WELDED: X RIVETED: BOLTED:

ACCOUNT EXECUTIVE: Mark Moesner

320350

E-MAIL: roger.bright@usda.gov

DIAMETER: 34’-0”

HIGH WATER LEVEL: 149’-0”

HEAD RANGE: 28’-1”

LOW WATER LEVEL: 120’-9”

USDA-ARS JWDSRC 200,000 Gallon EWT

Mil Thickness Testing

Roof 7.6 7.9 10.7 10.0 9.2 9.0 8.7

9.8 9.3 8.1

Bowl 11.2 13.4 10.6 10.1 11.4 13.2 10.7

10.0 11.5 12.0

Leg 1 2 3 4

9.8 6.8 8.4 12.2

8.7 7.3 8.2 9.3

8.4 6.9 8.9 8.8

9.2 9.0 6.7 8.0

Riser 11.0 7.8 10.7 9.9

Ultrasonic Thickness Testing

Roof 0.260 0.277 0.269 0.274 0.272 0.276 0.269

0.273 0.266 0.268

Bowl 0.269 0.274 0.272 0.264 0.262 0.278 0.261

0.277 0.271 0.270

Leg 1 2 3 4

0.428 0.437 0.419 0.430

0.417 0.429 0.429 0.424

0.437 0.416 0.416 0.424

0.435 0.441 0.446 0.425

Riser 0.433 0.432 0.436 0.440

Page # Work Proposed

C ri ti ca l D e fi ci e n cy

N O

N -C ri ti ca l

D e fi ci e n cy

O S

H A

S tr u ct u ra l

P re v e n ti v e

M a in te n a n ce

Post a Warning, Tampering With This Facility is a Federal Offense

(US code ti tle 42, section 300i -1) s ign.

X

Post a No Trespassing s ign. X

Clean the area around the anchor bolts , tighten the anchor nuts to speci fications , then tack weld on the ci rcumference of the nut-to-base plate connections and bolt-to-nut connections .

X

9 Insta l l a new screen on the overflow pipe elbow. X

Readjust cable type ladder safety device on exterior tower access ladder.

X

12 Reinforce the s trut ends by welding. X

15 Dri l l additional weep holes in the balcony floor. X

21 Insta l l a float-type l iquid level indicator. X

Readjust cable type ladder safety device on the shel l -to-knuckle roof access ladder.

X

Insta l l a compl iant 42" high handrai l system around the ci rcumference of the tank roof, complete with intermediate ra i l , toeboard and a swing gate at the junction of the shel l -to-knuckle roof access ladder and tank roof.

X

Post Confined Space Entry s ign on secondary roof hatch. X

Insta l l a compl iant interior access ladder complete with s tandoffs every 10' on center at the secondary roof hatch. In cold climates it's up to the owner's discretion on placement of internal ladders.

X

Insta l l a cable type ladder safety device on secondary interior access ladder.

X

Pressure wash the tank exterior with biodegradable detergent injection (minimum 3,500 ps i at 3.0 gpm), then re-evaluate the tank exterior at next inspection cycle.

X

Insta l l a mixing system. Electrica l work to be done by others i f required.

X

Page # Work Proposed

C ri ti ca l D e fi ci e n cy

N O

N -C ri ti ca l

D e fi ci e n cy

O S

H A

S tr u ct u ra l

P re v e n ti v e

M a in te n a n ce

Perform a dry interior cleanout, up to 3" of sediment. This work should be performed on an emergency basis. Additional accumulation wi l l be $300 per hour to remove. In the event the tank has to be dra ined, i t should be dra ined by the owner prior to our arriva l .

X

Insta l l a pass ive cathodic protection system. X

Sandblast a l l rusted and abraded interior areas to SSPC-SP10

(near white), and brush blast a l l remaining interior areas to

SSPC-SP7; then apply one (1) spot coat of epoxy primer to a l l areas sandblasted to #10, s tripe coat a l l weld seams, and apply epoxy to the entire tank, to achieve 8 to 10 mi ls of tota l dry fi lm thickness . Total mi l thickness wi l l include a combination of the exis ting and new coating.

X