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� <br />LuJ <br />�, <br />� <br />� <br />� <br />� <br />� <br />�' <br />�. <br />� <br />DAVID L. NELSON AND ASSOCIATES, INC. <br />Consulting Engineering Geology <br />October 27, 1988 <br />Project No. 13288 <br />Page 6 <br />Adequate drainage should be provided around the site area. We suggest the use <br />of foundation and roof drain systems, lndependently directed into a storm <br />drainage system. A possible drainage system could be developed from the area <br />of deeper excavation within the old drainage swale (northeast) portion of the <br />structure, where overexca�ation is recommended. A drainage system could be <br />placed ►+ithin a trench running from this area drnvn the old sWa1e area to the <br />north and outfalling within the existing swale to the north. We suggest this <br />system be designed to be sufficiently large enough to freely transmit all <br />accumulated surface, foundation, roof and subsurface pool area drainage out <br />of the area. using a PVC type tight-line. The drain could then be backfilled <br />using on-site excavated soils. The outfall area of the drain line should be <br />adequately constructed using a system which would minimize any potential <br />erosion from waters flowing from the drain pipe. This could be performed <br />using a sufficiently large rip-rap dispersion blanket, dispersion catch basin <br />or manhole, or other approved means. A survey of the existing drainage swale <br />which trends tavard the west should be perfornied to determine if additionat <br />erosion protection should be placed within the swale drainage thread. <br />Development within the proposed s+imming pool area should include an <br />appropriately prepared subgrade and structural fill as required (discussed <br />below), and adequate subgrade drainage. To reduce the potential for uplift <br />when the poot is drained, Me suggest that a free draining, Nashed a9gregate <br />blanket be placed at teast 12 inches thick Delow the pool area, and be <br />connected to a basal perforated pipe system, Mhich directs any accumulated <br />waters into the drainage system. <br />� Pavement areas, such as the proposed access driveway and turn-around, were <br />found to occur primarily within areas of non-uniform artiPicial fi11. Two <br />� general alternative approaches to stabilizing the pavement areas are <br />available. These consist of 1) removal and replacemrnt of the artificial <br />� fi11, and 2) compaction of the existing fitl materials. To achieve the most <br />stable pavement areas, removal and replacement of the artificial fi11 with <br />Ls� <br />u <br />.� <br />