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<br /> SCE Santa Ana <br /> October 25,2019 <br />Project No. 3.31634 <br /> Page 13 <br /> <br /> <br /> Approved fill soils should be placed in thin lifts (≤ 8-inches loose thickness) <br />and moisture conditioned to at least optimum moisture content. All fill should <br />be compacted to a minimum of 90-percent relative compaction. <br /> <br /> Any import soils shall be tested for suitability in advance by the project <br />Geotechnical Engineer. Earth fill material shall not contain more than 1- <br />percent of organic materials (by volume). Imported fill shall have a maximum <br />plasticity index of ≤ 12, and a liquid limit less than 40 when measured in <br />accordance with ASTM D 4318. <br /> <br />15.6 Foundation Setback <br /> <br />Utility trenches that parallel or nearly parallel structure footings should not encroach <br />within a 1:1 plane extending downward and outward from the outside edge of the <br />footing. <br /> <br />15.7 Concrete Slab‐on‐Grade Floors <br /> <br />Interior: Building slabs shall be supported by compacted fill. Subgrade soils should <br />have a very low expansion potential (EI < 20). Slabs should be designed for anticipated <br />loading. For design of slabs and estimating their deflections, a modulus of subgrade <br />reaction (Ks) of 100 pci may be used for compacted materials. <br /> <br />Slab thickness shall be a minimum of 4-inches. In areas where heavy equipment or <br />loading will stress the slab, the thickness will meet the requirements of the Structural <br />Engineer of record. Likewise, control joints and reinforcement should be designed by <br />the Structural Engineer. <br /> <br />Concrete slabs should be underlain by a vapor barrier/retarder (Stego Wrap or <br />equivalent - 10 mil minimum thickness), which is in turn, underlain by a single layer of <br />filter fabric (Mirafi) over a 4-inch layer of ¾” crushed stone. The filter fabric will help <br />protect the vapor barrier from puncture. All penetrations and laps in the moisture <br />barrier should be appropriately sealed. The membrane should have a high puncture <br />resistance and should be installed so that there are no openings or holes. All seams <br />should be overlapped and sealed at the laps per the manufacturer’s recommendations. <br />Where pipes extend through the membrane, the barrier should be sealed to the pipes. <br /> <br />Moisture retarders can reduce, but not eliminate moisture vapor movement from the <br />underlying soils up through the slab. We recommend that the floor coverings installer <br />58 of 100 <br />1327 S Grand Ave <br />12/12/2024