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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 15 <br />C.4.a. Drainage Control <br />We recommend installing drain tile to remove water behind the below -grade walls, at the location shown <br />in Figure 2. The below -grade wall drainage system should also incorporate free -draining, engineered fill <br />or a drainage board placed against the wall and connected to the drain tile. <br />Even with the use of free -draining, engineered fill, we recommend general waterproofing of below -grade <br />walls that surround occupied or potentially occupied areas because of the potential cost impacts related <br />to seepage after construction is complete. <br />Figure 2. Generalized Illustration of Wall Engineered Fill <br />SLOPED AWAY FROM THE BUILDING <br />�TO MAINTAIN LONG TERM DRAINAGE <br />3 <br />O O <br />EXISTING <br />SOIL <br />1. 2-foot wide area of Free - <br />Draining Engineered Fill or <br />Drainage Board. <br />2. Retained Engineered Fill. <br />3. 1-foot of Low -Permeability <br />Soil or Pavement. <br />DRAINTILE <br />WALL BACKFILL SKETCH <br />NOT TO SCALE <br />The materials listed in the sketch should meet the definitions in Section C.2.e. Low -permeability material <br />is capable of directing water away from the wall, like clay, topsoil or pavement. The project documents <br />should indicate if the contractor should brace the walls prior to filling and allowable unbalanced fill <br />heights. <br />4 :74 11, <br />INTEKTEC <br />