Submitted By: Jimmy Lopez
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Presentation By: Sean Lanier
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Department: Engineering
FORMAL TITLE:
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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
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OCALA'S RELEVANT STRATEGIC GOALS:
Operational Excellence
PROOF OF PUBLICATION:
N/A
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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 t...
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