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

GEOTECHNICAL ENGINEERING STUDY E-8602 Cascasia Pacific Properties, Ltd. Page 15 July 15, 1999 Excavations and Slones The following information is provided solely as a service to our client. Under no circumstances should this information be interpreted to mean that ECI is assuming responsibility for construction site safety or the contractor's activities; such responsibility is not being implied and should not be inferred. In no case should excavation slopes be greater than the limits specified in local, state and Federal safety regulations. Based on the information obtained from our field exploration, the existing fill and upper deposits of native soil would be classified as Type C by OSHA. As such, temporary cuts in these soils should be sloped at an inclination no steeper than 1.5H:1 V (Horizontal: Vertical). ECI should observe the excavations to observe soil and groundwater conditions, and verify the OSHA soil type. If temporary slopes cannot be constructed in accordance with OSHA guidelines, the use of shoring may be necessary. OSHA does allow the construction of slopes that exceed their guidelines, provided the geotechnical engineer approves the slope inclinations. When over -steepened slopes that exceed the OSHA guidelines are constructed, the geotechnical engineer must observe the slopes on a daily basis, or when weather conditions change. Permanent cut and fill slopes should be inclined no steeper than 2H:1 V. Cut slopes should be observed by ECI during excavation to verify that conditions are as anticipated. Supplementary recommendations can then be developed, if needed, to improve stability, including flattening of slopes or installation of surface or subsurface drains. In any case, water should not be allowed to flow uncontrolled over the top of slopes. Permanently exposed slopes should be seeded with an appropriate species of vegetation to reduce erosion and improve stability of the surficial layer of soil. Utility Trench Backfill Based on the soil conditions encountered at the time of our exploration, the native soils should provide adequate support for utilities. If remedial measures are necessary to provide adequate support for utilities, the unsuitable soils can be overexcavated and replaced with a rock ballast and pipe bedding material such as pea gravel. Eenh Con*ultnnu. Inc.