Title
Approving a Work Authorization Number 2019-1 as a supplement to the professional services agreement for the Water Treatment Plant Engineering Services with DCS Engineering, LLC. in the amount of $77,760.00 for professional services associated with the Zebra Mussel Chemical Control System.
Summary
City Staff approved and executed a five year professional services agreement with DCS Engineering, LLC. on January 20, 2015 for consulting engineering services for the Water Treatment Plant. The agreement included a process for Work Authorization requests for City approval in five service areas:
A. Engineering Consultation on Plant Operations
B. Regulatory Permitting
C. Water Treatment Plant Planning Services and Capital Improvement Program (CIP) Development
D. Design Services
E. Construction Management Services
This Work Authorization is for Design and Construction Management services. The professional services agreement for the Water Treatment Plant will terminate on January 19, 2020.
In 2017, zebra mussels were detected in Lake Travis and the Highland Lakes. In September 2018, routine cleaning and inspection by divers at the City's Colorado River Intake Pumping Station (downstream of Austin) found significant growth of zebra mussels inside the facility. Based on the size of the mussels, their presence at the Colorado River Intake Pumping Station has been about one year. In January 2019, inspection by divers found intermittent zebra mussel growth on the inside of the Lake Intake Tower at Lake Pflugerville and significant growth of zebra mussels inside the 48-inch pipe spanning to the Lake Pumping Station, which feeds water from Lake Pflugerville to the Water Treatment Plant.
DCS and City Staff met on September 19, 2018 to discuss zebra mussel background information and to develop an outline for the proposed plan to combat the pending infestation of the City's water supply facilities and/or Lake Pflugerville. Three phases of the control strateg...
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