Service Report
INVOICE #:
WORK DATE:
34367958
11/09/2023
DEVICE INSPECTION EXCEPTIONS
INSPECTION DETAIL
None Noted.
PRODUCTS APPLIED
None Noted.
Printed: 12/06/2023 Page: 2/2
Agenda Item #13.1.
Service Report
INVOICE #:
WORK DATE:
34367961
11/09/2023
CA - FR43382
CA - QAL120991
License #:
Ronald Vale
Time In:
Time Out:
11/9/2023 7:04:00 AM
11/9/2023 8:43:09 AM
Technician Signature
Customer Signature
Customer is unavailable to sign
LOCATION 3484243
707-339-1053
City of St. Helena Flood Wall
Flood Wall Zone B
1572 Railroad Ave
Saint Helena, CA 94574-1169
Phone:
BILL-TO 3484243
707-339-1053
City of St. Helena Flood Wall
Flood Wall Zone B
1088 College Ave
Saint Helena, CA 94574-1169
Phone:
Purchase Order Terms Service Description Quantity Amount None DUE UPON RECEIPT Burrowing Pest Control 1.00 640.00 Subtotal
Tax
640.00
0.00 Total 640.00
Prior Balance: 0.00
Total Due: 635.00
Payment Date Method Reference Payment Amount Applied Amount 10/27/2023 Check Scanned Payment $645.00 $5.00
GENERAL COMMENTS / INSTRUCTIONS
Inspected this whole area on foot found no activity in this area at this time. Thank you have a wonderful day.
CONDITIONS / OBSERVATIONS Reported Severity Responsibility Reviewed None Noted.
PRODUCTS APPLICATION SUMMARY
None Noted.
PEST ACTIVITY # Areas # Devices Pest Totals
None Noted.
DEVICE INSPECTION SUMMARY
AREA COMMENTS
None Noted.
Printed: 12/06/2023 Page: 1/2
Agenda Item #13.1.
Service Report
INVOICE #:
WORK DATE:
34367961
11/09/2023
DEVICE INSPECTION EXCEPTIONS
None Noted.
INSPECTION DETAIL
None Noted.
PRODUCTS APPLIED
None Noted.
Printed: 12/06/2023 Page: 2/2
Agenda Item #13.1.
Service Report
INVOICE #:
WORK DATE:
34367959
11/09/2023
CA - FR43382
CA - QAL120991
License #:
Ronald Vale
Time In:
Time Out:
11/9/2023 7:04:00 AM
11/9/2023 8:41:45 AM
Technician Signature
Customer Signature
Customer is unavailable to sign
LOCATION 3484258
707-339-1053
City of St. Helena Flood Wall
Flood Wall Zone C
1572 Railroad Ave
Saint Helena, CA 94574-1169
Phone:
BILL-TO 3484258
707-339-1053
City of St. Helena Flood Wall
Flood Wall Zone C
1088 College Ave
Saint Helena, CA 94574-1366
Phone:
Purchase Order Terms Service Description Quantity Amount None DUE UPON RECEIPT Burrowing Pest Control 1.00 960.00 Subtotal
Tax
960.00
0.00 Total 960.00
Prior Balance: 1934.40
Total Due: 2894.40
GENERAL COMMENTS / INSTRUCTIONS
Walked entire length of floodwall found minor go for activity at and treated with Percmachine. Thank you have a wonderful day.
CONDITIONS / OBSERVATIONS Reported Severity Responsibility Reviewed None Noted.
PRODUCTS APPLICATION SUMMARY
None Noted.
PEST ACTIVITY # Areas # Devices Pest Totals
None Noted.
DEVICE INSPECTION SUMMARY
AREA COMMENTS
None Noted.
DEVICE INSPECTION EXCEPTIONS
None Noted.
Printed: 12/06/2023 Page: 1/2
Agenda Item #13.1.
Service Report
INVOICE #:
WORK DATE:
34367959
11/09/2023
DEVICE INSPECTION EXCEPTIONS
INSPECTION DETAIL
None Noted.
PRODUCTS APPLIED
None Noted.
Printed: 12/06/2023 Page: 2/2
Agenda Item #13.1.
Agenda Item #13.1.
Agenda Item #13.1.
Agenda Item #13.1.
Agenda Item #13.1.
Agenda Item #13.1.
Agenda Item #13.1.
Flood Protection Project System Assessment
City of St. Helena
May 2024
Agenda Item #13.1.
Assessment Report Overview
Introduction & History
Process to Evaluate
Assessment Ratings & Recommendations
Agenda Item #13.1.
Introduction
Agenda Item #13.1.
Project Team
Jeff Kashiwada, PE
Design Engineer
Steve Sullivan, PE
Project Manager
Todd Petrik, PE
Structural Design
Agenda Item #13.1.
History of the Project
Agenda Item #13.1.
Project History
• In October 1998, the City kicked off a flood study in collaboration with Napa County.
• This study culminated in the “2001 Minimum Plan.”
• The City approved the Final EIR in Feb 2004, later amended (adopted July 2006).
• The “2006 Plan” was permitted in 2007.
• The permitting culminated with FEMA issuance of a Conditional Letter of Map Revision (CLOMR) on November 30, 2007.
• Project Bid and Construction Contract was awarded on April 14, 2009. • Notice of Completion adopted by City April 12, 2011.
• LOMR requested by the City on December 11, 2011.
• LOMR adopted on June 19, 2012, effective November 5, 2012.
Agenda Item #13.1.
Process to Evaluate
Agenda Item #13.1.
Project Assessment
Pre-Inspection Review of:
• Record Drawings
• Operations and Maintenance Manual
• City’s Periodic Inspection Reports (10/30/2015 – 10/31/2023) • Conservation Easement Monitoring Report (dated 11/12/2023) • Pest Control Inspection and Treatment Reports
Field Inspection:
• November 13, 2023
• M&H team and City Operations Staff
Agenda Item #13.1.
Flood Protection Project Systems
United States Army Corps of Engineers (USACE) Guidance for Periodic Inspection Procedures
• Levee Embankment Systems
• Floodwall Systems
• Interior Drainage Systems
• Pump Station Systems
• Flood Damage Reduction Channels Systems
Agenda Item #13.1.
Sample System Inspection Checklist
Agenda Item #13.1.
System Ratings
Acceptable System Minimally Acceptable
System
Unacceptable System
All items or components are
rated as Acceptable.
One or more items are rated as
Minimally Acceptable, or one or
more items are rated as
Unacceptable and an
engineering determination
concludes that the Unacceptable
items would not prevent the
system from performing as
intended during the next flood
event.
One of more items are rated as
Unacceptable and would prevent
the system from performing as
intended, or a serious deficiency
noted in past inspections (which
had previously resulted in a
minimally acceptable system
rating) has not been corrected
within the established timeframe,
not to exceed two years.
Agenda Item #13.1.
Assessment Ratings
and Recommendations
Agenda Item #13.1.
Levee Embankments System - Acceptable
Agenda Item #13.1.
Levee Embankment Photos
• Levee Vegetation, Sod Cover, and
Encroachments (Acceptable)
Field Inspection
November 13, 2023 Agenda Item #13.1.
Levee Embankment Photos
• Cracking (Acceptable)
Field Inspection
November 13, 2023 Agenda Item #13.1.
Levee Embankment Photos
• Rodent Control (Acceptable) − Less than 2 inches diameter − Less than 6 inches deep Field Inspection
November 13, 2023
Field Inspection
November 13, 2023
Agenda Item #13.1.
Floodwalls System – Minimally Acceptable
Agenda Item #13.1.
Floodwall Photos
• Tilting, Sliding or Settlement
(Minimally Acceptable)
Field Inspection
November 13, 2023 Agenda Item #13.1.
Floodwall Photos
• Tilting, Sliding or Settlement (Minimally Acceptable) Field Inspection
November 13, 2023
Field Inspection
November 13, 2023 Agenda Item #13.1.
Floodwall Photos
• Monolith Joint (Minimally Acceptable)
Field Inspection
November 13, 2023
Field Inspection
November 13, 2023
Agenda Item #13.1.
Interior Drainage System – Minimally Acceptable
Agenda Item #13.1.
Pump Station System – Minimally Acceptable
Agenda Item #13.1.
Pump Station Photos
• Fences and Gates – Minimally Acceptable
Field Inspection
November 13, 2023
Field Inspection
November 13, 2023
Agenda Item #13.1.
Flood Damage Reduction Channels System
– Acceptable
Agenda Item #13.1.
Recommendations
Agenda Item #13.1.
Floodwall System – Component Item 1
Unwanted Vegetation Growth – Minimally Acceptable
Minimal vegetation growth was observed on the waterside of the floodwall, within fifteen feet of the floodwall.
Recommendation: Remove waterside vegetation within
fifteen feet of the waterside face of the floodwall.
Agenda Item #13.1.
Floodwall System – Component Item 5
Tilting, Sliding or Settlement of Concrete Structures – Minimally Acceptable
The tilting, sliding, and settlement of the “T” wall section at the interface with the “I” wall section just upstream of STA 37+23.50 was observed to be Minimally Acceptable. The tilting, sliding, and settlement of this “T” wall section is evidence that this section of wall has rotated towards Sulphur Creek in relation to the adjacent “I” wall section.
Recommendation: It is recommended that City staff closely monitor this area during and directly after a highwater event and document conditions. It is further recommended that a detailed study of this area be initiated in the nearterm to evaluate the need and extent of bank stabilization required.
Agenda Item #13.1.
Floodwall System – Component Item 7
Monolith Joints – Minimally Acceptable
Over half of the floodwall joints showed a slight widening of the joint and had some type of repair or addition of the sealant at the surface of the joint. Many of these sealant repairs were completed in a way that did not result in the joint sealant being put back to its original condition. In addition, a single location was identified where the top handrail anchors of the baseplate were installed close to a joint in the concrete wall, causing the concrete to pop and spall off the top corner of the joint.
Recommendation: It is recommended that City staff put in place a repair/replacement program for the monolith joints in the floodwall. Further, City staff should regularly inspect the joints for continued deterioration. At the location where the handrail anchors were installed close to a floodwall joint, it is recommended to remove the spalled concrete, coat any exposed reinforcement to prevent reinforcement corrosion, patch the concrete, and resecure the handrail.
Agenda Item #13.1.
Interior Drainage System – Component Item 9
Culverts/Discharge Pipes – Unacceptable
The interior of the drainage culvert that passes through the levee embankment has not been visually inspected or
inspected by video recording equipment within the past five years.
Recommendation: Perform a visual inspection and
provide the report to the inspector for review.
Agenda Item #13.1.
Pump Station System – Component Item 6
Fencing and Gates – Minimally Acceptable
The Concrete Masonry Unit (CMU) perimeter wall (fence) is a Proto II wall system. The CMU Proto II walls on the south side of the pump station were tilting away from the interior of the compound and resulted in a crack at the top of the wall at each of the southeast and southwest corners.
Recommendation: The City staff should monitor the walls on the south side of the pump station on an annual basis for further tilting of the walls towards the inlet. If the cracks at the southeast and southwest corners continue to open further, a more detailed study is recommended.
Agenda Item #13.1.
Questions?
Agenda Item #13.1.