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Home My WebLink About56i K L E I N F E L 0 E R Protection Measures. A laver of sand. approximately 2 inches thick, may be placed over the membrane to protect it from damage, to act as an aid in curing of the concrete slab, and also to help prevent cement paste from bleeding down into the underlying capillary break. 4.6 DRAINAGE 4.6.1 Short Term Because the majority of the surficial site soils are moisture sensitive and relatively impermeable, both short- and lone -term drainage control measures should be included in project design and a' _. construction.'' Over the short term, we believe site and construction drainage can be reasonably well controlled w.. by careful excavation practices. Typically. these include, but are not limited to, shallow upgrade perimeter ditches or low earthen berms, and temporary sumps in excavations to collect seepage s and prevent water from damaging exposed subgrades. Drains should be included at the bottom of all temporary slopes to collect surface water flow ' from the slope and prevent it from flowing onto exposed building subgrades. All collected water F Y should be conveved under control to a positive and permanent discharge system, such as a storm sewer. 4.6.2 Permanent Over the long term, more permanent measures such as installation of footing and wall drains should be included. All permanent drains should be conveyed to a positive and permanent _ discharge point well away from the structure. Roof downspouts should not be connected to _ footing and wall drains, but should be tight lined separately to discharge. This will avoid the potential for roof debris to be washed into footing and wall drains and possibly blocking them. Clean -outs should he provided for both footing and wall drains and the downspout tight lines. Specific site drainage details are provided below. Footing Excavation Drain. In event that groundwater seeps into footing excavations, it should be possible to remove it by gently sloping the base of excavation to one or more 6021 3601 601 1 P-057 Pzge 19 of 36 Copyr,ght_G00 K;c*, fcdi Inc