The City's water system consists of two surface water treatment plants with the Lake Mary Water Treatment Plant being the primary plant providing up to 8 MGD million gallons per day of water resources. An evaluation was conducted in 2015 to assess conditions of the facilities to estimate their useful remaining life. Facilities were prioritized for conditions which needed immediate attention. The top priority improvement project identified was the rehabilitation of the Lake Mary Water Treatment Plant sedimentation basins.
Severe deterioration, spalling and exposed aggregate along vertical concrete walls requires attention. Sludge collector rake mechanism, drive, bridge, and center well assemblies are deteriorated and at the end of their useful lives. Significant corrosion on all drives, exposed metal components, weirs and channels, no provision for draining the clarifiers needs to be addressed.
The Lake Mary Water Treatment Plant sedimentation basin improvement project will rehabilitate and resurface existing sedimentation basins. There are 4 basins that measure 70ft x 70ft x 12 ft each. The rehabilitation project will replace existing clarifier drive and collector units in each of the settling basins for process sludge removal. Deteriorated concrete structures and piers need to be rebuilt and resurfaced. The sludge collection mechanisms, drive, center well, and bridge needs to be replaced. The project will also provide a new drain pump and wet well for the drain pump
Total project cost is estimated at $3.28 million dollars and construction of improvements will be funded by water rates.
On December 21, 2017, the Purchasing Section posted a Request for Statements of Qualifications (RSOQ) solicitation for Engineering Design consulting services on the PlanetBids website, and advertised the RSOQ in the Arizona Daily Sun on December 26, 2017 and January 2, 2018 On January 17, 2018, the City received a total of five (5) Statements of Qualifications (SOQs) from Engineering Consultant firms. An evaluation committee was formed consisting of six (6) members, including one member outside of City employment, all having experience working in or with Water Treatment operations and these specialized professional services. Based upon the numerical scoring of the SOQs, the evaluation committee identified the most qualified firm to perform the engineering services for the project. Brown and Caldwell's SOQ demonstrated a clear expertise in their knowledge and experience to develop a complex water treatment design. The scores for each of the firm's SOQs are as followed:
- Brown and Caldwell - 535
- Carollo Engineers - 511
- Garver, LLC - 508
- NCS Engineers - 497
- Greeley and Hanson - 454
|