To: MAYOR AND CITY COUNCIL
From: ANDREW WINJE, PUBLIC WORKS DIRECTOR
TITLE
title
AUTHORIZE THE PURCHASE OF PORTABLE FLOOD CONTROL BARRIERS FROM GARRISON SYSTEMS, LLC TO HELP MITIGATE THE IMPACTS OF EXTREME HIGH TIDES IN AN AMOUNT NOT TO EXCEED $100,000 SUBJECT TO SUCCESSFUL DEMONSTRATION AND REVIEW OF THE PRODUCT
end
EXECUTIVE SUMMARY
Recent record high tides attributed to El Niño and a recent Kelvin Wave have impacted waterfront facilities throughout Southern California, including the Redondo Beach Waterfront and King Harbor. Of particular concern is the impact to the storefronts along the International Boardwalk, which have experienced water up to their doorways and, in some cases, into the establishments despite being protected by sandbags.
Staff is researching a short-term mitigation solution that will perform better than the current sand bag method of protection and is ready to recommend a portable, modular flood barricade system for purchase to protect the area against compound high tide events predicted to come later in the year. The Mayim Barrier flood protection system is available using a Sourcewell cooperative purchasing agreement, and staff is requesting authorization to purchase a system promptly to provide for the earliest possible delivery date.
In anticipation of this historic tide phenomenon, staff researched enhanced mitigation measures and identified the Mayim system as a possible solution. Before committing to the purchase of the new system staff is performing live testing with demo Mayim materials and conferring with references to ensure the product will provide sufficient protection for property and life safety. The intent is to provide approximately 1,300 linear feet of a 30-inch high barrier around Basin 3, including International Boardwalk.
Using the published, and competitively bid, Sourcewell unit pricing, staff has a good faith estimate of $92,543.35 from Garrison Systems, LLC to fully encircle Basin 3. Staff is requesting authorization up to $100,000 for the purchase, in case minor adjustments to the order are required due to the continuing research of the product and its most efficient deployment. If the system demo proves satisfactory, an order will be made following Council approval, and delivery of the system materials is expected to occur prior to the next King Tide, which is predicted during the week of Thanksgiving.
BACKGROUND
The International Boardwalk seawall is no longer sufficiently high enough to hold back typical king tides, which typically reach approximately 7.1 feet above the Mean Lower Low Water Datum (MLLW). In most years these tidal flows are kept out of the store fronts through the placement of sandbags around the top of the seawall. When king tides are compounded by storm surge and wind events, remediation efforts become more difficult. A recent Kelvin Wave has led to historically high sea levels in recent days without the additional effect of storm surge.
The City is already experiencing the impacts of the “Super El Niño” predicted by the weather services this year. In addition to high tides this week, predicted at around 6.5 MLLW in tide charts for King Harbor, the water elevation has increased by 1.5 to 2 feet due to warm water expansion, a Kelvin Wave and other mercurial environmental factors. The total levels, estimated at about 8 MLLW early last week, have overwhelmed the regular sandbag barrier around Basin 3.
In anticipation of the historic weather year, staff has been searching for an affordable and more robust system to serve as an intermediate solution for flood protection (the long-term solution requires the execution of a significant and costly sea wall improvement project). The identified system appears to provide superior protection to sand bags and is portable enough to be used at other locations when tidal concerns are not a factor. Beyond the flood retention capability, staff considered price, availability, portability, storage, reuse, deployment and aesthetic concerns. When considering these factors, the Mayim Barrier flood protection wall system emerged as the favored solution. Staff is still testing and reviewing the system’s effectiveness at similar coastal locations, but with Council authorization, anticipates satisfying due diligence efforts in time to make an order and receive delivery of the product by the next projected King Tide expected to arrive the week of Thanksgiving.
Using Sourcewell pricing under Contract #040825-GAR, staff can satisfy the City’s procurement requirements while still being able to take delivery prior to Thanksgiving week. The estimate for the purchase of 1,300 linear feet of the system is $92,543.35, but staff is requesting authorization of $100,000 from Council in order to allow for modifications to the final order if additional product accessories or changes are needed to ensure a successful deployment in Basin 3.
COORDINATION
The Public Works Department has coordinated this item with the Fire Department’s Harbormaster.
FISCAL IMPACT
Funding for the purchase of flood control panels at a total cost of $100,000 is available in the completed Pier Parking Structure Repairs Project #70610, which currently has $297,769 of remaining funds. Funding in this project account is discretionary and may be utilized for the recommended purchase with approval of the City Council. The proposed purchase would utilize a Sourcewell cooperative purchasing agreement, as allowed per resolution CC-1005-317.
APPROVED BY:
Mike Witzansky, City Manager
ATTACHMENTS
• Quote - Garrison Systems, LLC.
• Brochure - Mayim Modular Flood Barrier
• Agmt - Sourcewell Contract #040825-GAR