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subgrade soils and providing foundation recommendations due to the added vertical and lateral loads from the <br />proposed second story addition. Excepted projects as described above item 1 through 4 shall follow the <br />alternate method as outlined below in lieu of geotechnical investigation report provided minimum foundation <br />clearance from slope is maintained based on Section 1808.7 or R403.1.7 or County of Orange Grading Code, <br />whichever is more restrictive: <br />A.For slab on grade construction <br />•Scarify top 12" or recompact 4' overexcavation prior to trenching for the utility <br />and/or foundation. 90% compaction report is required at the time of foundation <br />inspection. Damp proofing, base course and pre-saturation are required. <br />•Provide 5" slab on grade reinforced with #4 at 18" on centers each way over 4" <br />base of ½" or larger clean aggregate with 10 mil vapor retarder in direct contact <br />with concrete. Slab shall be tied-in to continuous 12" wide X 24" (minimum <br />embedment into firm soil) foundation. <br />•Continuous foundation must be reinforced with 2 #5 (or 3 #4) top and bottom. <br />See attached slab on grade foundation detail 'A' for additional information. <br />8.For raised foundation construction: <br />•Provide continuous foundation with 12" wide X 24" (minimum embedment Into <br />firm soll) around the perimeter of the addition. <br />•Continuous foundation must be reinforced with 2 #5 (or 3 #4) top and bottom. <br />•Provide 18" (minimum embedment) for all interior pier footing. <br />See attached raised floor foundation detail 'B' for additional information. <br />Note: All concrete shall be fc'=4,500 psi (minimum) with type V cement maximum water cement ratio of <br />0.45. No special Inspection required if concrete truck mix ticket is provided. <br />This policy does not apply to projects that require grading plans and permit per County Grading Code. <br />Approved by: <br />Rya[se,f� <br />Engineering Geologist <br />Hadl Tabatabaee, P.E., CBO, CASp <br />County Building Official 6-15-2020 <br />Foundation Requirements for Residential Projects <br />and Accessory Structures <br />Page 19 of 108 <br />1011 W Second St <br />5/1/2025