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2 City Council Regular Meeting Minutes May 14, 2013 Page 2 1 V. REPORTS FROM COMMISSION AND STAFF - NONE. 2 3 VI. GENERAL 13USINESS OF COUNCIL. 4 5 A. Resolution 13-040• a Resolution Accepting Salo Pond Water Quality Improvement 6 Project Plans and Specifications and Orderingy Advertising for Bids. Todd Ilubmer, WSB 7 & Associates, presenting. 9 City Engineer Hubmer explained that Silver Lake has been listed as impaired by the Minnesota 10 Pollution Control Agency (MPGA) for excess nutrients and the MPGA, in conjunction with the 11 Rice Creek Watershed District, completed a TMDL study that indicates phosphorus needs to be 12 reduced by 38.2 pounds per year. He indicated the State's water quality standard for total 13 phosphorus is 60 parts per billion and the planned water quality treatment system at Silver Lake 14 will improve water quality. He advised the State's standard for Chlorophyll A is 20 micrograms 15 per million and Silver Lake has exceeded this standard in almost every year and needs to reduce 16 algae production in the lake. He stated the State's goal for average water clarity is 17 approximately one meter and over the last three years the City has achieved its water quality goal 18 during the summer months but there were five years during which the City did not meet this 19 goal. Ile explained the City is proposing to construct a chemical treatment system similar to the 20 system used for treating drinking water where chemicals will be added to the lake that attach to 21 phosphorus and the water is then filtered out with clean water coming into the south pond of Salo 22 Park that gets flushed through to Silver Lake. He stated this treatment will achieve 90% of the 23 TMDL goal of reducing 29 pounds of phosphorus per year. He indicated the project will be 24 funded up to $150,000 by the MPCA as well as $50,000 by Rice Creek Watershed District and 25 the remaining $100,000 being paid by the City. Ile stated the project will have ongoing 26 maintenance costs of $15,000-$20,000 per year and will require first year operation costs for 27 calibration and monitoring. He noted the City's obligation of $100,000 will come from the 28 annual street reconstruction project because the project will meet permitting requirements and 29 will allow the City to bank credits for future projects. IIe advised the City is working on final 30 plans and specifications and bids will be awarded on June 25°i with submission of bid plans and 31 specifications to the MPCA for certification on June 26"i. He stated most utility contractors are 32 able to handle this type of project because it involves a system similar to a water treatment plant. 33 He indicated construction is not going to start until October or November this year and the 34 project will take five to six weeks. 35 36 Councilmember Stille asked if there would be noticeable improvements after installation of the 37 treatment system. 38 39 City Engineer Hubmer replied that the City will see significant improvements in a five or six 40 year time period after installation of the treatment system and as a result of the City's carp 41 management program. 42 43 Mayor Faust pointed out that these improvements are mandatory to meet State standards and the 44 requirements of the Rice Creek Watershed District. 45