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Commission approves $138 million contract and engineering amendment for Williamson Creek interceptor
Summary
The commission approved a $125.58 million construction contract (plus $12.56 million contingency, total $138.138 million) and unanimously approved a roughly $7.45 million amendment to the design engineer's contract to provide construction-phase services for the 3.5-mile Williamson Creek wastewater interceptor; staff described tunneling, odor control, environmental restoration and parkland mitigation.
The Water and Wastewater Commission on Jan. 14 approved a construction contract and an engineering-services amendment to advance the Williamson Creek wastewater interceptor project, a roughly 3.5-mile, 72-inch-diameter gravity interceptor that Austin Water said will be installed primarily by tunneling to increase capacity and reduce the risk of sanitary sewer overflows.
Kane Wei, supervising engineer for Austin Water's pipeline CIP delivery group, told commissioners the existing interceptor dates to the 1960s and ranges from 36 to 48 inches in diameter; the new 72-inch fiberglass pipe will convey three to six times more flow, resist corrosion and include operation-and-maintenance shafts, new connection points and a biological…
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