2824 GRAND AVE NAUTICA CONDOMINIUMS 2018-01-02 MF Import

GEOTECHNICAL ENGINEERING STUDY E-8602 Cascasia Pacific Properties, Ltd. Page 14 July 15, 1999 Slab -on -Grade Floors Slab -on -grade floors can be supported on competent native soils or structural fill. Loose or unstable subgrade soils should be stabilized prior to construction of the slab. The use of a geotextile and rock ballast, or cement kiln dust treatment can be considered for stabilizing the subgrade soils, if necessary. A four -inch capillary break consisting of a free draining poorly graded sand or gravel with less than five ^ rcent fines (percent passing the #200 sieve, based on the minus 3/4-inch fraction) should br . -.ed below the slab. In areas where slab moisture is undesirable, a vapor barrier such as a 6-mil plastic membrane can be placed beneath the free -draining sand or gravel. Site Drainage The site must be graded such that surface water is directed away from the building. Water must not be allowed to stand in construction areas. During construction, loose surfaces should be sealed by compacting the surface to reduce the potential for moisture infiltration into the soils. Interceptor trenches should be provided along the perimeter of excavation, where necessary, to intercept groundwater seepage before it enters the construction area. Groundwater seepage may be encountered in the excavation. If heavy groundwater seepage conditions are encountered, the use of sumps may be necessary to collect and discharge groundwater from the excavations. Seepage forces along temporary slopes for the excavation may cause piping and erosion of the slopes. Rock ballast can be placed in these areas to control piping and slope erosion, if necessary. A perimeter footing drain should be installed around the proposed structure to help reduce the potential for water infiltration during periods of high groundwater seepage. A typical footing drain detail is provided on Plate 4. In areas where temporary shoring is present, a tightline collector pipe will need to be installed along the inside perimeter of the foundation wall to collect water that passes through the weep holes. Under no circumstances should roof downspout drain lines be connected to the footing drain system. All roof downspouts must be separately tightlined to discharge. Earth ConauhaMv. tM.