7920 EVERGREEN WAY 2018-01-01 MF Import

GEUT[CHNICAL ENGINEEI G S3UDY � McDonald's Corpo�ation E-8879 August 30, 1999 Page 5 Concrete slabs resting on soil ultimately cause the moisture content cf the underlying soils to rise. This results from continued capillary rise and the ending of normal evapotranspiration. As concrete is permeable, moisture will eventually penetrate the slab resulting in a condition commonly known as a"wet slab" and poor adhesion of floor coverings. 'Therefnre, the slab should be provided with a minimum of four inches �f free-draining sand or gravel. (n areas where slab moisture is undesirable, a vapor oarrier such as a 6-mil plastic membrane may be placed beneath the slab. Two inches of damp sand may be placed over the membrane fur protection during construction and to aid in curing of tne concrete. Excavations and Sloo�;i� The following inforrtiation is provided solely as a service to our client. Under no circumstances should the information provided below be interpreted to mean ECI is assuming respons;bility for construction site safety or the contractor's activities; such responsibility is not being implied and should not be inferred. We do not anticipate that major cuts will be needed to achieve the proposed building subgrade elevations. It appears that there is adequate room for any building or utility excavation slopes to be laid back at safe angles using an open cut method, provided the excavation slopes are no greater than tfie limits specified in local, state and federal safety regulations. Based on the conditions observed in our borings, the existing fill and the glacial till soils are classified Type B and Type A, respectively,by OSHA. Therefore, temporary cuts greater than four feet in height should be sloped at an inclination no steeper than 1 H:1 V(Horizontal:Vertical) for Type B soils and 0.75H:1 V for Type A soils. If slopes of this inclination, or flatter, cannot be constructed, temporary shoring �ray be necessary. This shoring will help protect against slope or excavation collapse, and will pro� �de protection to workmen in the excavation. If temporary shoring is required, we will be available to provide shoring design criteria, ifi requested. We also recommend that all cut slopes be examined by Earth Consultants, Inc. during excavation to verify that conditions are as anticipated. Although we do not anticipate any permanent slopes, all permanent cut ancl fill slopes should be inclined no steeper than 2H:1 V. Permanently-exposed slopes should be seeded with an appropriate species of vegetation to reduce erosion and improve stability of the surficial layer of soil. Eerth Con�ultmu, Inc.