08-20-1984 Planning Packet - Laserfiche WebLink

Home Browse Search

:ing two property on. This on 28, Town lorize the bwo subject any guide- Dnds, Leek- to conduct (5 ponds. The de by the ~ 111,.mm. ... . . 984 revealed :res each ;s driveway jure 2)• Both T\arily of to the soil wo subject |her eleva- ive high avail- i moderate to the surface moisture nternal drain- ng wet seasons. »rs and wetlands for Hennepin County, released in July 1984, indicates this area is not within any protected water or wetland areas (see Figure 3), this< DNR authoriaztion to excavate or fill this site is not required. on Wednesday, August 1, 1984, soil borings were taken in the vicinity of the proposed pond locations as shown in Figure 2, These borings confirmed the existence of Glencoe soils in the low areas of both Lots 2 and 3. The water table was determined to be approximately at elevation 1030.5. This elevation is about 1.5 feet below the existing grade in the vicinity of the proposed pond on Lot 2, and 2.5 feet below the existing grade in the vicinity of the pro posed pond on Lot 3. RECOMMENDATIONS It has been proposed that one pond be excavated on each lot (see the pond location plan Figure 2). The ponds will enhance the aesthetic value of the property; however the benefits for wxldlife habitat is somewhat limited. Among the reasons for this is the close proximity of the ponds to the single family dwellings as well as the absence of proper vegetative cover for wildlife nesting and brooding areas surrounding the ponds. The ponds themselves should not exceed 8000 square feet in area at the t-r p* ^ meandering shaped pond of approximately 50 to 60 feet wide and 100 to 120 feet in length is recommended. The min imum excavated depth should be approximately 3-1/2 feet and the max imum excavated depth should not exceed 5 feet. Assuming an average excavated area of 5000 square feet and an average depth of 4.5 feet amounts to nearly 835 cubic yard*: per pond. If the excavated soil is not utilized as fill material elsewhere, it should be leveled adjacent to the pond to a maximum depth of 2 feet. . As discussed earlier, the excavated soil consists of silty clay. The characteristics of this soil is that it is very sticky and soft when wet, hard and difficult to mold when dry. It is a most difficult soil to handle by mechanical means, especially hand tools and small scale equipment. Due to the wet soil conditions and