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Alliance Residence October 18,2016 J.N.: 2530.00 Page 11 Following removals/overexcavation, the exposed grade should first be scarified to a depth of 8 inches, brought to at least 110 percent of the optimum moisture content, and then compacted to at least 90 percent of the laboratory standard. 6.1.5 Fill Placement In general, materials excavated from the site may be used as fill provided they are free of deleterious materials and particles greater than 4 inches in maximum dimension. Fill materials should be placed in loose lifts no greater than approximately 8 inches in thickness. Each lift should be watered or air- dried as necessary to achieve 110 percent to 120 percent of the optimum moisture content, and then compacted in place to at least 90 percent of the laboratory standard. The laboratory standard for maximum dry density and optimum moisture content for each soil type should be determined in accordance with ASTM D 1557. Each lift should be treated in a similar manner. Subsequent lifts should not be placed until the project geotechnical consultant has tested the preceding lift. Lifts should be maintained relatively level and should not exceed a gradient of 20:1 (H:V). Excavations into site materials may expose soils with very differing characteristics. If such differing materials are created through excavation, they should be blended to create a relatively uniform soil mix when reused as fill below the structures. The blending of each lift should be observed and approved by the geotechnical consultant prior to placement of additional lifts of fill. 6.1.6 Import Materials If import materials are required to achieve the proposed finish grades, the proposed import soil should be free from deleterious materials, should have an Expansion Index (EI) less than 100 and be non-corrosive to concrete and ferrous metals. The geotechnical consultant should be informed of import sources prior to hauling the materials to the site so that appropriate testing and evaluation of the proposed import material can be performed in advance. 6.1.7 Temporary Excavations Temporary construction slopes in site materials that are not surcharged may be cut vertically up to a height of 5 feet. Temporary excavations greater than 5 feet but no greater than 10 feet in height that are not surcharged should be laid back at a maximum gradient of 1: 1 (H:V) or properly shored. Slopes that expose friable soils should be laid back to a maximum gradient of 1.5: 1 (H:V) or flatter i f deemed appropriate by the geotechnical consultant. Temporary excavations greater than 10 feet in height or any excavations that will be surcharged should be reviewed by the geotechnical consultant for specific recommendations. Excavations should not be left open for prolonged periods of time. The project geotechnical consultant should observe all temporary cuts to confirm anticipated conditions and to provide alternate recommendations if conditions dictate.All excavations should conform to the requirements of Cal/OSHA. Where insufficient room exists for recommended lay back cuts, shoring or slot cutting methods may be required. Additional recommendations for such conditions will be provided at that time. The grading contractor should take appropriate measures when excavating adjacent existing improvements to avoid disturbing or compromising support of existing structures. ALBUS-KEEFE & ASSOCIATES, INC.