Submitted By: Jimmy Lopez
presenter
Presentation By: Sean Lanier
end
Department: Engineering
FORMAL TITLE:
title
Change order and additional expenditures under the contract with All Webbs Enterprises, Inc., for the construction of two Upper Floridan Aquifer Wells at Water Treatment Plant No. 2 in the amount of $382,225 plus a contingency of $50,000 for a total expenditure of $432,225
end
OCALA’S RELEVANT STRATEGIC GOALS:
Operational Excellence
PROOF OF PUBLICATION:
N/A
body
BACKGROUND:
On April 1, 2025, the City Council approved the award of the contract to All Webbs Enterprises, Inc. (AWE), for the construction of two 24-inch diameter Upper Floridan Aquifer Wells in the amount of $1,367,700. Well No. 11 and Well No. 12 are located at Water Treatment Plant No. 2 (WTP #2). WTP # 2 is located at 3744 South Pine Avenue.
On September 3, 2025, the City Council authorized a change order to AWE’s contract in the amount of $176,736 for the installation of a 30-inch-diameter casing at Well sites No. 11 and No. 12, extending to approximately 90 feet below land surface (bls). The primary objective of this modification was to isolate a subsurface void that had been causing circulation loss at both locations at approximately 70 to 83 feet bls.
During drilling at the Well No. 12 site, AWE made several efforts to stabilize unconsolidated material while advancing the drill bit to install the 24-inch diameter final casing string at a depth of between 140 and 145 feet bls. These efforts involved various drilling techniques, including mud, additives, foam drilling, and a 30-inch-diameter liner, in response to the development of multiple sinkholes and ongoing material cave-ins.
Due to the limited distance between the problematic zone and the final casing depth (145 to 175 feet bls), along with a high design flow rate of 3,500 gallons per minute, there is an extreme risk of the finished well “pumping sand”, therefore, AWE has recommended relocating Well No. 12 to a different site.
FINDINGS AND CONCLUSIONS:
At the City Engineer’s direction, AWE performed a geotechnical investigation on an alternative well location and recommended a revised well design for the geological formations encountered at the new location. This change to drill Well No. 12 at the new location will add approximately 32 calendar days extension to the contract schedule and require an additional $382,225 in funding to cover the additional work.
Staff recommends approval for the City Engineer to issue a change order to relocate Well No. 12 and to add $382,225 in funding, plus a contingency of $50,000, to allow the City Engineer to issue change orders to cover any unforeseen conditions or other conflicts that may arise during construction. This change order will be funded from the Water Resources Construction Fund.
FISCAL IMPACT:
Funding is available in the following account: 308-030-335-533-69-65010.
PROCUREMENT REVIEW:
These change orders are in compliance with the City’s Procurement Policy.
LEGAL REVIEW:
The underlying agreement was approved as to form and legality by City Attorney, William Sexton.
ALTERNATIVE:
• Approve with Changes
• Table
• Deny