Title
Resolution to Approve the Professional Services Agreement with LG Design, Inc., for Professional Engineering Services for the Water Treatment Plant Interim UV Disinfection System Project ($145,060.00)
Memorandum
This memorandum and resolution requests approval of a professional services agreement for professional engineering services with LG Design, Inc. (formerly known as CH2M and a wholly owned subsidiary of Jacobs Engineering, Inc.) for the Water Treatment Plant (WTP) Ultraviolet (UV) Disinfection System Project for a total of $145,060.00.
In June 2017 the Michigan Department of Environmental Quality (MDEQ) notified the City of Ann Arbor that their drinking water supply contained levels of Cryptosporidium (a waterborne parasite) that exceeded an annual average limit. MDEQ stated that compliance for treatment was required by June 2020. Subsequently, in 2017, the City hired CH2M to perform a study to evaluate alternatives for compliance. The study concluded that the City is able to meet the new disinfection requirements some of the time, but not all of the time. When the City is performing annual maintenance on some of its treatment basins, which can take 4 to 8 weeks each year, the City is unable to meet the new disinfection requirements. CH2M's study recommended adding an interim ultraviolet light (UV) disinfection process that will enable the City to comply with the new disinfection requirements during this 4 to 8 week maintenance window. In the long term, the study recommended adding a permanent UV disinfection facility as part of the large plant improvement project scheduled in the City's Capital Improvement Plan.
The interim UV system will have hydraulic limitations, therefore it would not meet the requirements of a long term permanent UV disinfection system. However, interim UV system will allow the City to meet the MDEQ deadline, and provide additional time for the City to implement a long-term solution that best fits into the future ...
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