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MEMORANDUM <br />DATE: April 23, 2007 <br />TO: Lisa Tilman, FOR <br />FROM: Adam Parker, P.E. <br />SUBJECT: Grading Pond Evaluation <br />Lamotte Property Grading <br />Lino Lakes, MN <br />MFRA #16379 <br />This memo will summarize and evaluate the anticipated effects of excavating three ponds in <br />previous upland areas for the Lamotte Property in Lino Lakes, MN. These ponds are located <br />within the vicinity of Anoka County Ditch 25. <br />ALTERATIONS TO EXISTING DRAINAGE AREAS <br />The attached sketch delineates the drainage area to each of the ponds. As shown in the sketch, <br />each pond's drainage area is relatively isolated to immediate upstream areas. The construction <br />of the ponds will not greatly alter existing drainage patterns. The outlet of Pond C would be the <br />wetland located to the south. That wetland is not directly connected to ACD 25 and appears to <br />drain to Cedar Lake Watershed before reaching ACD 25. <br />PONDS AFFECT ON NEARBY WETLANDS <br />The attached soil borings show the underlying soil types are shown to have the greatest effect on <br />groundwater elevations. Soil Boring #2 (located in Area of Pond B) shows the groundwater <br />elevation is most likely the result of artesian pressure. For the other ponds, the groundwater <br />elevations tend to be located slightly above clay lens layers. <br />• <br />