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NOV 21 '97 16:22 FR BARR ENGINEERING 612 832 2601 TO 94725663 P.03/04 <br /> Saga Hill Preservation Society <br /> Page 2 <br /> November 21,2997 <br /> Alternative Water QualiPond Lo tions li and discussed above that <br /> It appears that there may be alternative locations for the water quality P <br /> would meet the water management goals of the city while reducing the capital costs required to <br /> construct and maintain the pond. We have identified the following alternatives: <br /> 1. Upstream End of South Ravine (Location 1): As shown on Figure 1, there is adequate <br /> area and volume at the head of the south ravine to provide a water quality pond to treat runoff <br /> from the 16 acres tributary to this pond location. Location 1 lies entirely on undeveloped property <br /> and no valuable shoreline is encumbered. Maintenance access could be obtained from the existing <br /> Garden Trail easement so no additional properties would be affected. <br /> 2. Upstream of Wildhurst Trail (Location 2):This pond location is shown on Figure 1 on <br /> the upstream side of Wildhurst Trail. This area is an existing low point for drainage of a portion <br /> of the FL-19 Subwatershed upstream of Wildhurst Trail. One <br /> tlocation <br /> os propertywobe affected <br /> easily <br /> by <br /> this <br /> alternative and no shoreline would be encumbered. pond <br /> ataccessed from Wildhurst Trail without affecting additional properties. An outlet from a pond in <br /> this location should be piped to Forest Lake (Figure 1)to prevent erosion of the steep slope <br /> between the pipe outlet and the lake. Sediment from the erosion of the slope would have an <br /> adverse impact on the water quality of Forest Lake. <br /> 3. Combination of Locations 1 &2:A third alternative may include water quality ponds in <br /> both locations described above. If a combination of ponds were considered,it may be prudent to <br /> route the discharge from Location 1 through the ravine to Wildhurst Trail,then through a pipe to <br /> the outlet from Location 2 as shown in Figure 1. <br /> Conclusion <br /> Water quality pond FL-Q15 shown in the"Stormwater Management Plan Orono,Minnesota, 1st <br /> Draft," could potentially be relocated upstream in one or two areas that would greatly reduce the <br /> uate the feasibility of <br /> cost of property and easement acquisition. The thatould minimize theof Orono should lerpenditure of public <br /> these alternatives in future drafts of their Plan <br /> funds and encumbrance of private property. <br /> Respectfully yours, <br /> Mark Jacobson <br /> Water Resources Scientist <br /> MAJIy m}i <br /> Enclosures <br /> NEWPROJ\55266-1 <br />