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CITY OF SANTA ANA <br />Planning and Building Agency <br />Approved <br />FOR PERMIT ISSUANCE <br />The subject site is a previously graded lot where a house exists. The un erlying soils <br />were previously properly treated, as necessary, and previously evaluated to bpuitabJ6 for <br />structural support prior to approval for construction of the existing house. ess too:the <br />existing house due to settlement (and/or any other geotechnical issues) was oa� -served / <br />reported. Therefore, deep-seated settlement of the soils underlying th;7 site is ni <br />considered to be a concern for the proposed new structures. <br />In general, based on our experience, the conventional total settlement of 1/2 inch and a <br />differential settlement of 1/4 inch over a horizontal distance of 30 feet are anticipated for <br />the proposed new structure and would occur during the construction stage <br />New (Interior) BuildinlZ Slabs -on -Grade <br />New interior building slabs -on -grade should be minimum 4 inches thick, reinforced with <br />#4 re -bars at 18 inches on centers, or equivalent, placed at mid -height of the slab. <br />New slabs should be underlain by a 2-inch-thick layer of clean sand. For moisture <br />sensitive floor areas, the new slabs should be underlain by a 10-mil polyethylene <br />moisture barrier membrane (such as Visqueen). The moisture barrier membrane should <br />be properly lapped and sealed at joints and around any breaks such as openings for utility <br />conduits. <br />Note: CAL Green Code, and/or other applicable codes/City's requirements should govern <br />and be followed. The entire slab -on -grade system including the capillary break / <br />vapor/moisture retarder should be properly designed by the project civil /structural design <br />engineer of record (but not by the geotechnical engineer) and reviewed and approved by <br />the City prior to construction. <br />New Exterior Slabs -on -Grade <br />To reduce the potential for excessive cracking, new exterior concrete slabs -on -grade, if <br />any, should be minimum 4 inches thick, provided with construction or weakened plane <br />joints at frequent intervals (e. g., every 6 feet or less). Provision of a 2-inch thick layer of <br />crushed rock, gravel, or clean sand to be placed beneath the slabs and/or reinforcement, <br />such as #3 re -bars at 24 inches on -centers, or equivalent, placed at the mid -height of the <br />slab should be considered. The subgrade soils for the exterior slabs should be properly re - <br />compacted. <br />Page 7 <br />