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ST. BARBARA CATHOLIC SCHOOL TASK 2 75-24272-01 <br />DIOCESE OF ORANGE SEPTEMBER 12TH, 2024 <br />SANTA ANA, CA BID & PERMIT SET <br /> <br />EARTHWORK 312000 - 7 <br />immediately in writing where it becomes necessary to remove hard, soft, weak, or wet material <br />to a depth greater than indicated. Unless otherwise indicated, concrete placed below grade will <br />be formed and excavations shall allow for placement and removal of forms. Side cuts shall be <br />cribbed and shored as required. <br />B. Unclassified Excavation: Excavation is unclassified and includes excavation to required <br />subgrade elevations regardless of the character of surface and subsurface conditions <br />encountered. Unclassified excavated materials may include rock, soil materials, and <br />obstructions as described in the referenced Geotechnical Investigations Report. <br />1. If excavated materials intended for fill and backfill include unsatisfactory soil materials, <br />replace with satisfactory soil materials. <br />2. Earth excavation includes excavating pavements and obstructions visible on surface; <br />underground structures, utilities, and other items indicated to be removed; together with <br />soil, boulders, and rocks. <br />3. <br />4. Rock fragments greater than 3 inches in diameter shall be taken off-site or placed in <br />accordance with the recommendations of the Geotechnical Engineer in areas designated <br />as suitable for rock disposal. <br />3.5 STABILITY OF EXCAVATIONS <br />A. Comply with local codes, ordinances, and requirements of authorities having jurisdiction to <br />maintain stable excavations. <br />B. Unshored Temporary Excavations: <br />1. Unshored temporary excavations may be sloped back at 1 to 1 (horizontal to vertical) or <br />flatter up to 5 feet in height. Where sloped embankments are used, the tops of the slopes <br />should be barricaded to prevent vehicles and storage loads within seven feet of the tops of <br />the slopes. If the temporary construction slopes will be maintained during the rainy <br />season, construct berms along the tops of the slopes where necessary to prevent run-off <br />water from entering the excavation and eroding the slope faces. <br />3.6 EXCAVATION FOR STRUCTURES <br />A. Excavation Limits: Shall be to a tolerance of plus-or-minus 0.10 foot and shall extend five (5) <br />feet laterally beyond the building limits at the excavation level and five (5) feet below existing <br />grade, or deeper to excavate existing fill. The excavation side slopes shall not exceed a slope <br />ratio of 1.5 to 1, horizontal to vertical, up to 5 feet in height, unless they are positively retained <br />by shoring or other approved methods. Over-excavation side slopes may be vertical, as long as <br />they are no higher than allowed by the State of California Construction Safety Orders, in which <br />case they shall be no steeper than 1.5 to 1. If cut below depths indicated, excavations shall be <br />filled with concrete when the foundations or footings are placed. Revise first subparagraph <br />below if footings and foundations are placed on engineered fill.