Clear Lake Sanitary District News and Information Update

From the Administrator/Superintendent, Mitch Hanson

UV Disinfection Project

The District completed a $1.2 million UV disinfection project May 31, 2019 in response to regulatory requirements. The UV system is capable of treating 11.4 million gallons per day.


Nutrient Reduction
In response to regulatory requirements for reducing nutrients (total nitrogen and phosphorus) the District hired HDR engineering to prepare and submit to the DNR a Nutrient Reduction Strategy Report in June 2018. The report outlines different methods for reducing nutrients by March 2023. One method and probably the least cost option is to install an in-basin probe and control system intended to enhance the existing treatment system’s controls ability to remove nutrients biologically. The in-basin system was purchased in May 2019 and should be installed and operating within 3 to 4 months. Nutrient removal will then be monitored for the next couple of years. If needed, the report lists other options that will complement the in-basin probe and control system to further reduce nutrients.


SBR Inner Wall Project
Bids were received March 2019 for the SBR Inner Wall project but were rejected since they were over the engineer’s estimate. The scope of this project includes forming and pouring an eight thick inner wall around the of the four SBR treatment tanks. The objective of this project is to add 30 to 40 years of life to the deteriorating concrete walls. The project will re-bid later this year.