3304.4.1 Support of excavation construction documents.
BC § 3304.4.1
Means of supporting excavations, including related or resulting embankments, rock faces, and soil slopes, shall be indicated on construction documents. Such means of supporting excavations shall be installed and maintained in accordance with the construction documents. The construction documents shall be prepared by a registered design professional who has demonstrated knowledge or experience in the design of retaining structures or bracing systems for the support of excavation. Where the excavation exceeds 20 feet (6096 mm) in depth, the registered design professional shall be a New York State licensed professional engineer. Exceptions: Construction documents indicating the means of supporting the excavation are not required if: 1. The excavation meets the conditions specified in Items 1.1 through 1.4: 1.1. Is less than 5 feet (1524 mm) in depth; 1.2. Occurs above the level of the water table; 1.3. Occurs more than 5 feet (1524 mm) from all streets, sidewalks, tunnels, railroad tracks, public right of ways, and retaining walls; and 1.4. Occurs either: 1.4.1. More than 5 feet (1524 mm) from all footings and foundations; or 1.4.2. When within 5 feet (1524 mm) or less from a footing or foundation, does not extend below the level of the footing or foundation.
2.The excavation meets the conditions specified in Items 2.1 through 2.3: 2.1. Occurs more than 5 feet (1524 mm) from all footings, foundations, streets, sidewalks, tunnels, railroad tracks, public right of ways, and retaining walls; 2.2. Does not exceed 20 feet (6096 mm) in depth; and 2.3. Either: 2.3.1. The slope of the excavation does not exceed 1.5 horizontal to 1 vertical (34 degrees measured from the horizontal), with no benching allowed; or 2.3.2. A registered design professional determines the soil type, and the excavation is properly sloped or benched for the soil type in accordance with the requirements of Section 3304.4.2. Determination of the soil type shall be based upon a site specific evaluation, and documentation of the determination, signed and sealed by the registered design professional, shall be kept at the site.
3.A trench box is utilized in accordance with the manufacturer's specifications, provided a physical copy of the manufacturer specifications are available onsite.
4.It is a trench that complies with Table 3304.4.1, including all notes to the table.
5.The excavation is performed in conjunction with the installation or removal of an exterior in-ground pool, provided such pool is an accessory to a one-or two-family home, is limited to 400 square feet (121.92 m 2 ) in area, and further provided that the distance from the edge of the pool to any building, structure, or lot line is greater than the depth of the deepest portion of the pool.
6.Where demolition drawings are required by Section 3306.5, separate support of excavation construction documents for the removal of the foundation are not required, provided the details required for a support of excavation drawing are instead shown on the demolition drawings. Table 3304.4.1Minimum Sizes of Timber Bracing and Timber Sheet Piling for Trenches Not Exceeding 10 Feet (3048 mm) in Depth and 15 Feet (4572 mm) in Width Depth of trenchWidth of trenchNominal size of cross bracing at 6 feet (1829 mm) horizontal spacingShoringUp to 10 ft (3048 mm)Up to 9 ft (2743 mm)6 in x 8 in (152 mm x 203 mm)Sheet Piling, 2 in x 6 in (51 mm x 152 mm), spaced tight, andWales, 12 in x 12 in (305 mm x 305 mm), with 5 ft (1524 mm) maximum vertical spacingUp to 15 ft (4572 mm)8 in x 8 in (203 mm x 203 mm) Notes to Table 3304.4.1: 1. All timber or equivalent substitute to have bending strength of 850 psi or above.
