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2717 Huckleberry Rd, Unit #2 Santa Ana, CA 92706 <br /> <br /> <br />In general, temporary excavations should be performed in accordance with OSHA requirements. Care should be <br />taken during excavation near an existing (on-site or offsite) structural object, if any, to ensure no damage is <br />done to the existing object. <br />In general, temporary cut near an existing (on-site or off-site) structural object, if any, should not be performed <br />below a 1:1 imaginary plane projected from the outside bottom edge of the footing of the existing object unless <br />proper shoring is provided. <br /> <br />In general, a near vertical cut can be performed for temporary cuts 5 ft. or less in height. For the temporary cuts <br />higher than 5 ft., the portion above 5 ft. should be flattened to 1H:1V, otherwise shoring should be provided. <br /> <br />For this project, temporary excavation is not anticipated to impact the existing footings. However, this will be <br />verified by the geotechnical engineer based on the soil conditions to be exposed during the excavation. It is also <br />not anticipated, however, if needed construction in sections, about 10 -15 ft. long can be performed. Again, this <br />will be determined based on the conditions of the soils to be exposed during excavation. <br /> <br />The above temporary-cut recommendations can be changed by the geotechnical consultant based on conditions <br />exposed in the field during excavations. <br /> <br />BUILDING FOUNDATION DESIGN GUIDELINES <br /> <br />Geotechnical Parameters For Structural Design <br /> <br />For conservative purposes, the following “lowest” code values should be used for structural design, as needed. <br /> <br />a. Allowable vertical bearing earth pressure: 1,500 psf. <br />An increase of one-third is permitted when using the alternative load combinations that include wind or <br />earthquake loads. <br />b. Lateral bearing passive earth pressure: 100 psf. per foot into competent materials below the finished <br /> ground surface. <br /> <br /> An increase of one third is permitted when using the alternative load combinations that include wind <br /> or earthquake loads. <br /> <br />c. Lateral Sliding Resistance: cohesion = 130 psf. <br /> <br /> The cohesion value is to be multiplied by the contact area. <br /> <br /> In no case shall the lateral sliding resistance exceed one-half the dead load. <br /> <br />d. Soil unit weight: 120 pcf. <br /> <br />Page 7 of 22