200,000 gallon litchfield tank assessment report...the litchfield elevated water tank is a 200,000...

111618Georgetowncountyfullreport.docx

200,000 Gallon Litchfield Tank

Assessment Report

Assessment Date November 16, 2018

Prepared for: Georgetown County Water and

Sewer District 4145 Highmarket St

Georgetown, SC 29440

Prepared by: AECOM

425 South Cashua Drive Florence, SC 29501

Certified By: Brad Poston

NACE Certified Coating Inspector Level 1


Contents

1.0 General Information ........................................................................................................ 3

2.0 Summary of Field Observations .................................................................................... 4 2.1 Exterior ..................................................................................................................................... 4 2.2 Interior ...................................................................................................................................... 6

3.0 Recommendations .......................................................................................................... 8 3.1 Exterior ..................................................................................................................................... 8 3.2 Interior ...................................................................................................................................... 9

4.0 Probable Cost of Construction ................................................................................................ 11

Appendices

Appendix A Inspection Photos

Appendix B Laboratory Report


1.0 General Information

The Litchfield Elevated Water Tank is a 200,000 gallon welded steel tank, located on Blackgum

Rd near Hwy 17 in Pawley’s Island. It was constructed in 1975*.

AECOM assessed the condition of the tank at the request of the Georgetown County Water and

Sewer District on November 16, 2018. The primary purpose of this assessment was to inspect

the coating and overall condition of the tank. Recommendations for noted deficiencies will also

be included in this report.

The assessment consisted of a visual observation of the coating system as well as the interior

and exterior components of the tank. Assessment data was documented using digital still

photographs.

Date: November 16, 2018

AECOM Project No.: 60592576

Water System: Georgetown County Water and Sewer District (GCWSD)

Tank Name: Litchfield Elevated Water Tank

Tank Location: Blackgum Road, Pawley’s Island, SC

Nearest Intersection: Blackgum Road and Hwy 17

Latitude/Longitude: 33.4811876, -79.1035831

Capacity: 200,000*

Erection Date: 1975*

Manufacturer: Taylor Iron Works*

Design Type: Double Ellipsoidal

Number of Columns: 6

Column Diameter: 36”

Riser Diameter: 36”

Riser Manhole Size: 16”x12”

Height to Overflow: 149’-0”*

Construction Type (welded or riveted): Welded

Security: 6’-0” Chain Link Fence

Notes: *Values listed are from the Name Plate located on the tank riser.


2.0 Summary of Field Observations

Assessment personnel met with staff from GCWSD on November 16, 2018. Conditions noted

during the field assessment are documented below and are supplemented with color

photographs at the end of the report.

In general, the assessment showed that most areas of the tank exterior and interior surfaces are

in poor condition. The exterior coating has significant corrosion, delamination, “mud cracking”,

and poor adhesion. The interior coating also has significant corrosion.

There is also unused conduit/electrical service on the tank and areas of deteriorated metal on

the bases, bolts, ladder rungs, ladder brackets, and other areas.

2.1 Exterior

2.1.1 Concrete Base, Anchor Bolts, and Base Plate

The coating on the concrete base, anchor bolts, and base plates is in poor condition.

There is significant corrosion and delamination to the point to where there is bare metal

showing.

There appears to be minor metal loss on the base plates.

There are several anchor nuts/bolts that have corroded to the point of becoming

deteriorated with a significant amount of metal loss.

2.1.2 Columns, Struts, and X-Rods

The coating on columns is in poor condition.

There is significant corrosion, “mud cracking”, and delamination present.

There is mildew present.

There appears to be no metal loss on the columns.

The coating on the struts and x-rods have significant corrosion, “mud cracking”, and

delamination.

There appears to be minor metal loss on the turnbuckle nuts and bolts where the x-rod

and struts connect.

2.1.3 Riser

The coating on the riser is in poor condition.

There is significant corrosion, “mud cracking”, and delamination present.

There is a 16”x20” manway in the riser.

There is a sample port installed on the riser.

The name plate is installed on the riser.


2.1.4 Catwalk, Handrails, and Vertical Shell Plates

The coating on the catwalk, handrails, and vertical shell plates is in poor condition.

There are significant areas of corrosion, “mud cracking”, and delamination.

There are areas on the catwalk floor that appear to have moderate metal loss.

There are ten to fifteen low lying areas on the catwalk floor where water cannot drain

properly.

There does not appear to be any metal loss on the vertical shell plates.

The level indicator appears to be out of service.

There is what appears to be a corral installed at the top of the vertical shell plates. The

coating on it matches the condition of the rest of the tank.

2.1.5 Roof

The coating on the roof of the tank is in poor condition.

There are significant areas of corrosion, “mud cracking”, and delamination.

There is a 24”x24” hatch with curb.

There are no cellular antennas mounted to the roof of the tank.

2.1.5 Vent

There is an 18” diameter vent.

The coating is in poor condition.

There is a screen installed.

There is an aviation light mounted to the top of the vent.

2.1.6 Ladders and Safety Devices

The coating on the exterior ladders is fair.

There moderate corrosion on the rungs and brackets.

It was indicated by GCWSD that some repairs had been made to the ladder, however

there is still moderate metal loss on the column ladder and the dome ladder.

Galvanized cable safety climbs are installed on both exterior ladders.

2.1.7 Aviation Light

There is an aviation light mounted to the top of the vent.

At the time of the inspection the light was not on.

2.1.8 Logos

There is a logo on the tank.

2.1.9 RF Antennas

There are no antennas mounted on the tank.

2.1.10 Security

The site has a 6’-0” chain link fence with a gate locked by a combination padlock.


The ladder gate is locked with a Master Lock Key # 2402.

The access hatch is locked with a Master Lock Key # 2402.

2.2.11 Coating

The finish coat on the exterior of the tank appears to be an epoxy.

The adhesion is poor. There is severe delamination of the existing coating system.

Exterior paint samples were taken at the inspection. The results are attached in

Appendix B.

2.2.12 Site Considerations

The tank is located on a wooded lot with a few houses somewhat close by.

2.2 Interior

Assessment of the tank interior (via the upper access hatch) revealed the following:

2.2.1 Riser

Due to the amount of water in the tank during the time of the inspection, the interior of

the riser of the tank could not be inspected thoroughly.

2.2.2 Bowl

Due to the amount of water in the tank during the time of the inspection, the bowl of the

tank could not be inspected thoroughly.

There is a minor amount of sediment present in the belly of the tank.

2.2.3 Vertical Shell Plates and Braces

The coating on the vertical shell plates and braces is fair.

There is minor corrosion on the vertical shell plates around where the braces attach.

There is moderate corrosion on the braces.

2.2.4 Roof

The coating on the roof is fair.

There is minor corrosion on the roof.

2.2.5 Ladders and Safety Devices

The coating on the interior ladder is poor.

There is significant corrosion on the rungs and brackets.

There is significant metal loss on the rungs and brackets.

2.2.6 Overflow

The overflow is a 6-inch diameter pipe that starts on the interior and exits the tank to run

down a column leg on the exterior.

The coating is poor.


The pipe connects to a pipe that leads underground.

2.2.7 Coating

The interior coating is an epoxy system.

The coating system is in poor to fair condition.


3.0 Recommendations

3.1 Exterior

Overall, the exterior coating of this tank is in poor condition. AECOM recommends that the

exterior of this tank receive a full renovation immediately.

3.1.1 Coating Recommendations

Exterior Steel:

Surface Prep- Pressure wash with the chemical Chlor*Wash to remove all mildew, dirt,

salt and any surface containments with a 5,000+ pound-per-square-inch (PSI) pressure

washer before blasting to remove all the old existing coating. The surface should be

washed daily with Chlor*wash prior to any prep work or coatings being applied.

o Blast all exterior steel to SSPC SP6 Commercial Blast Cleaning standards,

minimum 2.5 surface profile.

Prime Coat - Apply one (1) full coat of aromatic urethane, zinc rich (performance equal

to Tnemec Series 91 H2O or 94 H2O HYDRO-ZINC) at 2.5-3.0 dry mils.

Stripe Coat – Apply one (1) stripe coat of polyamidoamine epoxy (performance equal to

Tnemec Series 66) at 3.0-5.0 dry mils to all handrails, hard edges, roof laps, weld

seams, and deep pits.

Full Prime Coat - Apply one (1) full coat of polyamide epoxy (performance equal to

Tnemec Series 161HS) at 3.0-5.0 dry mils.

Intermediate Coat - Apply one (1) full coat of aliphatic acrylic polyurethane

(performance equal to Tnemec Series73 ENDURA-SHIELD) at 2.5-3.0 dry mils.

Finish Coat - Apply one (1) full coat of advanced thermoset solution fluoropolymer

(performance equal to Tnemec Series 700 HYDROFLON) at 2.5-3.0dry mils.

Concrete Base:

Surface Prep -Wash the mildew, dirt, and surface containments off of the tank with

5,000+ PSI pressure washer with a rotating nozzle. Hand/Power tool loose coating and

corroded areas to a specification of SSPC SP2/3.

Prime Coat - Apply one (1) full coat of polyamidoamine epoxy (performance equal to

Tnemec 161HS) at 4.0-8.0 dry mils.

Finish Coat - Apply one (1) full coat of polyamidoamine epoxy (performance equal to

Tnemec 161HS) at 4.0-8.0 dry mils.

Additional Coat - Apply one (1) two inch layer of modified aliphatic polyaspartic

(performance equal to Tnemec 265 Elastoshield TG) at 50.0-100.0 dry mils between

concrete base and metal plate.


3.1.2 Exterior Repairs

1. Remove galvanized safety cable climb from column and dome ladder.

2. Install stainless steel safety climb on column leg ladders. Install neoprene gasket

between safety climb device and ladder rungs.

3. Drill (10-15) ¾” holes in the catwalk floor to allow adequate drainage.

4. Install new sample port on riser.

5. Install pressure gauge on riser.

6. Install multiple 2”x8”x1/4” flat bar standoffs adjacent to exterior leg and dome ladders

with spacing no greater than 10’ on center.

7. Remove unused conduit.

8. Repair or remove level indicator.

9. Repair areas with metal loss as required on structural steel.

10. Replace anchor bolts.

11. Replace riser manway with 24” diameter manway.

12. Install new 24” diameter frost free vent.

13. Remove corral.

3.2 Interior

The interior coating is in fair condition with areas of corrosion. AECOM recommends that the

interior of this tank receive a full renovation at the same time as the tank exterior.

3.2.1 Coating Recommendations

Interior Steel:

Surface Prep-Blast all interior steel to SSPC SP10 Near-White Blast standard, minimum

2.5 surface profile.

Prime Coat - Apply one (1) full coat of aromatic urethane, (performance equal to

Tnemec Series 91 H2O or 94 H2O HYDRO-ZINC) at 2.5-3.0 dry mils.

Stripe Coat- Apply one (1) stripe coat of polyamidoamine epoxy (performance equal to

Tnemec series N140 POTA-POX) at 4.0-6.0 dry mils to all hard edges, roof laps, weld

seams, ladders, handrails, deep pits, and clips.

Intermediate Coat - Apply one (1) full coat of polyamidoamine epoxy (performance

equal to Tnemec Series N140 POTA-POX) at 4.0-6.0 dry mils.

Finish Coat - Apply one (1) full coat of polyamidoamine epoxy (performance equal to

Tnemec Series N140 POTA-POX) at 4.0-6.0 dry mils.


3.2.2 Interior Repairs

1. Install stainless steel safety climb to interior ladder. Install a neoprene gasket between

safety climb device and ladder rungs.

2. Remove and replace interior bowl ladder.

3. Repair or remove the interior components of the old float system.


4.0 Probable Costs of Construction

Cost estimates are provided for the recommendations identified in Section 3. Any opinions of

probable construction costs provided by AECOM represent AECOM's good faith professional

judgment in light of its experience, knowledge and the information reasonably available to

AECOM at the time of preparation of the opinion. However, since AECOM has no control over

the market, economic conditions or the bidding procedures, AECOM does not make any

guarantees or warranties with respect to such opinions.

The table below represents budget level cost estimates based upon current market conditions

and do not incorporate any considerations for impacts of future inflation. Table 4.1 presents the

estimated costs for rehabilitation.

Table 4-1. Estimated Costs for Rehabilitation

Treatment Location Surface

Prep

Coating System Expected

life cycle

Cost

Full

renovation Wet Interior SSPC SP10 Zinc, Epoxy, Epoxy 15+ years $80,000

Full

renovation Exterior SSPC SP6

Zinc, Epoxy,

Polyurethane,

Fluoropolymer

15+ years $180,000

Repair Items $50,000

Containment $100,000

Contingency (~15%) $40,000

Total Estimated Costs $450,000


APPENDIX A

INSPECTION PHOTOS

Name Plate Hatch on Riser

Corrosion of Riser Corrosion of Column and Base

Corrosion of X-Rod Corrosion of Anchor Bolt

Corrosion of Anchor Bolt Nut Corrosion of Overflow Pipe

Corrosion of Anchor Bolt Corrosion of Column Base

Tank Belly Corrosion on Column

Column Coating Adhesion Test 1

Coating Adhesion Test 2 Ladder/ Ladder Gate

Corrosion of Ladder Bracket Corrosion of Ladder Rung

Corrosion of Strut and X-Rod Connection Strut

Corrosion of Ladder and Bracket Corrosion of Ladder and Bracket

Corrosion of Column and Moss on X-Rods Corrosion of Column

Corrosion of Column X-Rod

Unused Conduit and Wire Strut

Corrosion of Ladder Strut

Rust on Safety Climb Cable Corrosion of Ladder Bolt

X-Rods Corrosion of X-Rod

Delamination on Tank Belly X-Rods and Braces

Corrosion under Balcony Floor Corrosion under Balcony Floor

Underneath Balcony Floor Tank

Corrosion of Balcony Floor at Ladder Corrosion of Balcony Floor at Ladder

Corrosion of Balcony Floor at Ladder Column Connection

Tank Wall Dome Ladder and Level Board Indicator

Delamination of Coating on Tank Wall Corrosion of Balcony Floor

Corrosion of Balcony Floor Delamination of Coating on Tank Wall

Tank Wall and Corral Corrosion of Balcony Floor

Corrosion of Balcony Floor Corrosion of Balcony Floor

Corrosion of Handrail on Balcony Corrosion on Overflow Pipe

Dome Ladder Dome Ladder at Knuckle

Dome Hatch Knuckle of Tank

Knuckle of Tank Corrosion of Level Indicator

Vent Corrosion of Tank Roof

Corrosion of Hatch Curb Corrosion of Interior Ladder

Corrosion of Interior Ladder Corrosion of Interior Brace Rods

Interior Brace Rods Interior Brace Rods

Interior Tank Roof Interior Ladder Rung

Dome Hatch Corral

Gap Between Tank and Corral Brace Rod

Brace Rod Brace Rod

Tank Belly Ladder Gate Secured upon leaving

Gate Secured upon leaving Gate Secured upon leaving


APPENDIX B

LABORATORY REPORT

SHEALY ENVIRONMENTAL SERVICES, INC.

The electronic signature above is the equivalent of a handwritten signature.This report shall not be reproduced, except in its entirety, without the written approval of Shealy Environmental Services, Inc.

Shealy Environmental Services, Inc.106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.shealylab.com

Report of Analysis

AECOM101 Research DriveColumbia, SC 29203Attention: Nathan Ward

Project Name: Georgetown Co W&S - Litchfield Tank

Project Number: 60592576, Task 1

Lot Number:TK29036

Date Completed:12/05/2018

12/11/2018 3:22 PMApproved and released by:

Project Manager: Kelly M. Nance

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SHEALY ENVIRONMENTAL SERVICES, INC.SC DHEC No: 32010001 NELAC No: E87653 NC DENR No: 329 NC Field Parameters No: 5639

Shealy Environmental Services, Inc.106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.shealylab.com

Case NarrativeAECOM

Lot Number: TK29036

This Report of Analysis contains the analytical result(s) for the sample(s) listed on the Sample Summaryfollowing this Case Narrative. The sample receiving date is documented in the header informationassociated with each sample.

All results listed in this report relate only to the samples that are contained within this report.

Sample receipt, sample analysis, and data review have been performed in accordance with the mostcurrent approved NELAC standards, the Shealy Environmental Services, Inc. ("Shealy") QualityAssurance Management Plan (QAMP), standard operating procedures (SOPs), and Shealy policies. Anyexceptions to the NELAC standards, the QAMP, SOPs or policies are qualified on the results page ordiscussed below.

Where applicable, all soil sample analysis are reported on a dry weight basis unless flagged with a "W"qualifier

If you have any questions regarding this report please contact the Shealy Project Manager listed on thecover page.

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SHEALY ENVIRONMENTAL SERVICES, INC.Sample SummaryAECOMLot Number: TK29036

Sample Number Sample ID Matrix Date Sampled Date Received001 11/27/2018Paint Chips - Litchfield Tank Solid 11/29/2018

(1 sample)

106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.shealylab.comShealy Environmental Services, Inc.

Page 3 of 8

SHEALY ENVIRONMENTAL SERVICES, INC.Detection SummaryAECOM

Lot Number: TK29036

Sample Sample ID Matrix Parameter Method Result Q Units Page001 Paint Chips - Litchfield Tank Solid Barium 6010D 5900 W mg/kg 5001 Paint Chips - Litchfield Tank Solid Chromium 6010D 59 W mg/kg 5001 Paint Chips - Litchfield Tank Solid Lead 6010D 190 W mg/kg 5(3 detections)


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RCRA MetalsDescription: Matrix:

Date Received:

Client: Laboratory ID:Date Sampled:

AECOMPaint Chips - Litchfield Tank

TK29036-00111/27/201811/29/2018

Solid

Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch1 3050B 6010D 10 12/05/2018 0409 CJZ 12/04/2018 0922 911731 7471B 7471B 1 12/02/2018 2126 JCF 12/02/2018 1318 91116

AnalyticalCASParameter Number Method Result Q LOQ Units RunArsenic 7440-38-2 6010D ND W 1mg/kg6.3Barium 7440-39-3 6010D 5900 W 1mg/kg11Cadmium 7440-43-9 6010D ND W 1mg/kg2.1Chromium 7440-47-3 6010D 59 W 1mg/kg4.2Lead 7439-92-1 6010D 190 W 1mg/kg4.2Mercury 7439-97-6 7471B ND W 1mg/kg0.076Selenium 7782-49-2 6010D ND W 1mg/kg8.4Silver 7440-22-4 6010D ND W 1mg/kg4.2

LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration rangeP = The RPD between two GC columns exceeds 40%ND = Not detected at or above the LOQ N = Recovery is out of criteria

H = Out of holding time W = Reported on wet weight basis


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Chain of Custodyand

Miscellaneous Documents


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