625 S Cypress Ave - Plan - Laserfiche WebLink

Home Browse Search

625 Cypress Avenue Geotechnical Investigation Project No. W1895-88-01 - 27 - April 23, 2024 7.10 Temporary Excavations 7.10.1 Excavations up to 7 feet in height may be required for excavation and construction of the proposed improvements. The excavations are expected to expose artificial fill and alluvial soils, which are suitable for vertical excavations up to 5 feet in height where loose soils or caving sands are not present, and where not surcharged by adjacent traffic or structures. 7.10.2 Vertical excavations greater than 5 feet or where surcharged by existing structures will require sloping or shoring measures in order to provide a stable excavation. Where sufficient space is available, temporary unsurcharged embankments could be sloped back at a uniform 1:1 slope gradient or flatter up to a maximum of 8 feet in height. A uniform slope does not have a vertical portion. Where space is limited, special excavation measures will be required. 7.10.3 Continuous vertical excavations in close proximity to an adjacent structure could remove vertical and lateral support from the existing improvements and are not recommended. Special excavations measures such as trench shoring will be required where the proposed excavation will be deeper than an existing adjacent foundation or adjacent to a property line. Recommendations for trench shoring are provided in the following section. 7.10.4 Where temporary construction slopes are utilized, the top of the slope should be barricaded to prevent vehicles and storage loads at the top of the slope within a horizontal distance equal to the height of the slope. If the temporary construction slopes are to be maintained during the rainy season, berms are suggested along the tops of the slopes where necessary to prevent runoff water from entering the excavation and eroding the slope faces. The soils exposed in the cut slopes should be inspected during excavation by our personnel and the contractor’s competent person so that modifications of the slopes can be made if variations in the soil conditions occur. All excavations should be stabilized within 30 days of initial excavation. 7.11 Trench Shoring 7.11.1 To protect the existing footings, hydraulic trench shoring may be implemented where excavations will extend below existing foundations. 7.11.2 Excavation may be conducted adjacent to a foundation but should not extend below the foundation until the shoring is installed. Once shoring is installed the excavation can be completed. Once the concrete is placed to an elevation that is slightly above the bottom of