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• • • WS — Item 4b. WORK SESSION STAFF REPORT Work Session Item 4b. Date: August 6, 2007 To: City Council From: Bernie Bullert, TKDA Re: Water Treatment Plant Feasibility Study Background Lino Lakes water supply is provided by the Jordon sandstone aquifer. This source is considered abundant and meets all health requirements. The City does not treat its water for iron and/or manganese removal, softening, or any other conventional treatment processes. The City does provide chemical additions including disinfection and fluoridation at the wellheads. Blending of raw well water with treated water on peak days has been evaluated to reduce treatment plant size. Blending is accomplished on peak days by sending 75 to 80 percent of the raw water supply through the treatment plant and using a bypass line to allow 20 to 25 percent of the raw water to go directly to the water storage for blending. The proposed water treatment plant is an ideal candidate for blending because the raw water supplied to the treatment plant from the wells does not carry contaminants which cause health related issues. During recent years several metro communities have begun to use blending to reduce water treatment plant capacity. By using the blending of raw well water with treated water, the City can be served by a single treatment plant. The treatment feasibility study utilizes two types of treatment technology and proposes two different plant layouts, based on the space needs that each technology requires. The acreage needed at the two proposed site locations was determined based on those plant layouts. At this time health requirements and resident complaints do not warrant treatment. However, due to the complexities of a water treatment facility and efficient integration of a facility into the City's system of pipes, wells and storage, advanced planning is necessary. The study addresses water quality, future water demands, site selection, plant floor plan options, future infrastructure needs, and financing / funding alternatives. Attached is the Draft Water Treatment Plant Feasibility Study, dated August 1, 2007. 1