Inspection_Report_Sedimentation_Basin_2_WTP_.pdf
PDF 5 MB Posted
- Solicitation number
- 26-027NT
- Issued by
- Manatee County, Florida
About this file
Inspection Report Summary
This is an Inspection Report prepared by the City of Bradenton Public Works & Utilities for Sedimentation Basin and Flocculator No. 2 at the Bradenton Water Treatment Plant (5600 Natalie Way E, Bradenton, FL 34203). The inspection, conducted on October 8, 2025, evaluated the condition of steel-reinforced concrete structures originally constructed in 1988 to determine required repairs and maintenance. The report documents comprehensive visual inspections of exterior sidewalls, internal basin conditions, equipment functionality, and auxiliary connections. Key findings reveal exterior stucco spalling with evidence of through-wall cracks and seeping, interior sidewall cracking with significant deterioration, corrosion in mechanical systems including motors and gearboxes exposed to ferric sulfate chemicals, damaged equipment supports at launder troughs, and minor piping leaks beneath the sedimentation basin wall. All flocculation and sedimentation mixer equipment was found operational but showing signs of aging and heavy corrosion from exposure to ferric sulfate treatment chemicals used in the water treatment process.
The report recommends that for continued service, all concrete cracking and interior deterioration be neutralized and prevented through repair and coating systems to arrest ongoing deterioration. The inspection findings and recommendations formed the basis for the subsequent rehabilitation project solicitation (IFB #26-027NT), which calls for removal and reapplication of protective coatings, epoxy injection repair of concrete cracks, cured-in-place pipe lining of drains, and replacement of mixer systems and flocculator components with new equipment. The preliminary scope evaluation document serves as a technical justification for the comprehensive rehabilitation work outlined in the formal invitation to bid issued by the City of Bradenton in March 2026.
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City of Bradenton
Public Works & Utilities I 888 13th Ave E Bradenton, Florida 34208
941.708.6300 I www.cityofbradenton.com
Gene Brown Jayne Kocher Marianne Barnebey Kemp Schuessler Lisa Gonzalez Moore Pam Coachman Mayor Ward 1 Ward 2 Ward 3 Ward 4 Ward 5
INSPECTION REPORT
Preliminary Scope Evaluation for
City of Bradenton WTP
Unit:
Flocculation/Sedimentation Basin No. 2
Component:
Full System
Report Date:
October 8, 2025
Prepared By: Reviewed By:
Kristofer Eccles, P.E. Kim Clayback, P.E.
http://www.cityofbradenton.com/
Page 2 WTP –Sedimentation Basin No. 2
TABLE OF CONTENTS
1.0 OVERVIEW………………………………………………………...….…………………. Page 3
2.0 INSPECTION SUMMARY…………………………………………….…………….……Page 4
2.1 Executive Summary………………………………………..………………….. Page 4
2.2 Inspection Overview…………………………………………..………………. Page 4
2.3 Photos of Inspection Findings………………………………….…………… Page 5
3.0 EQUIPMENT DRAWINGS / NOMENCLATURE…………………………………..…Page 14
3.1 Site Plan, Basin no 4 location…………………….…………………………Page 14
3.2 Flocculator Construction Details………………..…..…………...………...Page 15
3.3 Flocculator Construction Details………………..…..………...…………...Page 16
3.4 Sedimentation Basin Construction Details..…..……………….………...Page 17
3.5 Sedimentation Basin Construction Details..…..……………….………...Page 18
Page 3 WTP –Sedimentation Basin No. 2
1.0 OVERVIEW
On October 8, 2025, the City of Bradenton self-performed performed the preliminary inspection on flocculator and sedimentation basin no. 2 at the water treatment plant, located at 5600 Natalie Way E, Bradenton, FL 34203.
The following operations and/or visual inspections were performed to evaluate the repairs required / recommended:
Visually inspect and record:
-Exterior basin condition -Internal basin condition -Equipment condition -Connections to auxiliary equipment
Page 4 WTP –Sedimentation Basin No. 2
2.0 INSPECTION SUMMARY
2.1 Executive Summary
Flocculator and sedimentation basin No. 2, steel-reinforced concrete structures, constructed in 1988, were taken out of service for routine inspection, cleaning, and maintenance.
The City of Bradenton WTP utilizes ferric sulfate at a pH around 4-5 for flocculation and settling of sludge from the raw water. Use of this chemical contributes to the staining/discoloration seen throughout the inspection.
The exterior of the basins showed signs of sidewall cracking and seeping, with stucco damaged in many areas. Upon inspection of the interior of the basin, similar cracking was found confirming through-wall cracks.
Overall, all piping and equipment were found in working, but aged condition.
Corrosion seen through the mechanical systems (motors, gearboxes, paddles) will continue to deteriorate will exposure to ferric sulfate.
For continued service, any concrete cracking and interior deterioration should be neutralized and prevented in the future through repair and coating.
2.2 Inspection Overview
Visual Inspection:
Exterior Sidewalls Exterior stucco coating was spalling in many areas.
Evidence of through cracks with seeping stains.
Upper Walkways Overall good condition with typical cracking throughout
Piping systems Staining from minor leak under the sedimentation basin wall sleeve from flocculator no. 2. Obsolete piping to be removed from the rapid mixing chamber.
Equipment
All flocculation/sedimentation mixer motors/gearboxes were found in operational but aging condition. All mixing paddles were intact but showed signs of heavy corrosion.
Interior
Evidence of previous coating system. Sidewall cracking with significant deterioration, corresponding with exterior seeping. Broken supports at one launder trough support pipe.
Page 5 WTP –Sedimentation Basin No. 2
2.3 Photos of Inspection Findings
Exterior Sidewalls:
Cracks in stucco with evidence of seeping
Cracks in sedimentation basin stucco with evidence of seeping
Page 6 WTP –Sedimentation Basin No. 2
Damaged sedimentation basin stucco near existing crack repairs
Exterior Piping:
Staining from minor leak under the sedimentation basin wall sleeve from flocculator no. 2
Page 7 WTP –Sedimentation Basin No. 2
Upper walkways:
Concrete cracking, typ
Upper walkways:
Upper walkways/handrails in overall good condition
Page 8 WTP –Sedimentation Basin No. 2
Equipment:
Rapid mixer in working order, extra feed pipe from previous project to be removed
Flocculator mixers intact
Page 9 WTP –Sedimentation Basin No. 2
Sedimentation mixer drive units in working order, aging condition – corrosion, broken conduit
Sedimentation mixer drive units in working order, aging condition – corrosion, broken conduit
Page 10 WTP –Sedimentation Basin No. 2
Interior sidewalls:
Cracking throughout sedimentation basin walls
Cracking throughout sedimentation basin walls
Page 11 WTP –Sedimentation Basin No. 2
Cracking and erosion throughout sedimentation basin walls
Heavy corrosion through mixers, rubber squeegee blades in good condition
Page 12 WTP –Sedimentation Basin No. 2
Heavy corrosion through mixers, rubber squeegee blades in good condition
Effluent launder system:
Missing bolt at support pipe
Page 13 WTP –Sedimentation Basin No. 2
Effluent launder system:
Broken u-bracket at support pipe
Page 14 WTP –Sedimentation Basin No. 2
3.0 EQUIPMENT DRAWINGS / NOMENCLATURE
3.1 Site Plan, Basin no 4 location
Page 15 WTP –Sedimentation Basin No. 2
3.2 Flocculator Construction Details
Page 16 WTP –Sedimentation Basin No. 2
3.3 Flocculator Construction Details
Page 17 WTP –Sedimentation Basin No. 2
3.4 Sedimentation Basin Construction Details
Page 18 WTP –Sedimentation Basin No. 2
3.5 Sedimentation Basin construction details
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