1505 112TH ST SW 2018-01-02 MF Import

GEOTMINICAL ENGM-EKING STUDY Wells Development Corporation E-5813 July 27, IM Page 6 Slab -on -grade Doors may be supported no at least one foot of recumpacted native soil subg-.ade or on structural fill. Any disturbed native soils must either be recompacted or replaced with structural fill. The slab should be provided with a minimum of four inches of free -draining sand or gravel. In areas where slab moisture is undesirable, a vapor barrier such as a 6-mil plastic membrane may h' placed beneath the slab. Two inches of damp sand may be placed over the membrane for protection during construction and to aid in curing of the concrete. F.7CCYMUQDS You should be aware that in no use should excavation slopes be greater than the limits specified in local, state and federal safety regulations. According to the new OSHA regulations, the native soils would be classified as a type 'B' soil. Therefore, temporary cuts greater term four feet in height (i.e. miscellaneous demolition excavations) should be sloped at an inclination no stager than 1 H:1 V for type 'B' soils. If slopes of this inclination, or flatter, cannot be constructed, or if excavations greater than twenty (20) fat in depth are required, temporary shoring may be necessary. This shoring would help protect against slope or excavation collapse, and would provide protection to workmen in the excavation. If temporary shoring is required, we will be available to provide shoring design criteria, if requested. The above information has been provided solely as a ser6ce to our client. Under no circumstances should the above information be interpreted to mean that this office is a!suming responsibility for construction site safety or the contractor's activities; such responsibility is not being implied and should not be inferred. If seepage is encountered in foundation excavations during construction, we recommend your contractor slope the bottom of the excavation to one or more shallow sump pits. The collated water can then be purl* from these pits to a positive and permanent discharge, such as a nearby storm d in. Depending on the magnitude of such seepage, it may also be necessary to interconnect the sump pits by a system of connector trenches. It is recommended that the appropriate locations of subsurface drains, if needed, be established during grading operations by this office, at which time the seepage arras, if present, may be more clearly defined. Earth Consallanls, Inc.