05-17-94 CCM - Laserfiche WebLink

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Elevation 956. At Elevation 963, the additional storage meant more alum would be needed, increasing the cost to $8,000. Results of the sampling taken on May 4 were then presented. The pond phosphorus levels ranged from 0.125 mg/L near the surface to 0.139 mg/L at 5.6 meters depth. These compared with Olsen Lake total phosphorus of 0,020 to 0.022 mg/L for a similar depth range. Total dissolved phosphorus for Olsen Lake Estates Pond was between .054 and .058 mg/L as against 0.009 mg/L for Olsen Lake. The effect of not treating the water and discharging to Lake Olsen had been discussed (Hal Lunke?) There was a strong possibility of a green algae bloom occurring now in Lake Olsen or a blue green bloom in late summer. Based on a mass balance between the pond and the lake, the phosphorus concentration in Lake Olsen would increase from .020 mg/L to .026. With treatment it would increase from .020 to .021 mg/L. Comparing Secchi disc readings, at 20 mg/L water clarity would be 3.4 meters, at 26 it would be 1.8 meters. There would be no noticeable difference between 20 and 21 mg/L. President Zetterberg then proposed a motion: 1. To go ahead and treat the pond on May 7, and 2. To outlet the pond to Lake Olsen, but at no specific time - sometime during the week of May 9, by which time they hoped to get the temporary easement across Mr. Winkel's property. This was subject of some discussion - on the gain for $8,000 expenditure, the time for which the treatment would be effective, and the precedent to the need for treating other bodies of water as the need arose. The motion was passed 4/1 on a rollcall vote, Mr Moosebruegger voting Against. 4 Questions were raised by local residents, as well as comments to the effect that when the level of 952 was reached, they would expect that the City of Oakdale would correct the erosion and plant the vegetative mitigation. Mayor Bearth indicated that Oakdale's position was that the pond was a VBWD matter, to be resolved by them, as they had agreed to it. Oakdale would comply with whatever they (VBWD) resolved to solve the technical problem.