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$40 <br /> <br />6. (5) <br /> <br />Lateral Earth Pressures: <br /> <br />The following measures are recommended during the design and placement of retaining walls: <br /> <br />Retaining walls used in this project shall be designed to res, ist the earth pressure <br />exerted by the retained compacted backfill plus any additional lateral forces that <br />will be applied to the walls due to surface loads placed at or near the wall. <br /> <br />Timine of lmolementation/Verification <br /> <br />Prior to grading permit issuance; <br />during construction <br /> <br />Method of Verification <br /> <br />Grading plan check and field <br />inspection <br /> <br />Responsible Parties <br /> <br />Senior Plan Check Engineer, <br />Building Division; Inspection <br />Services Manager, Building <br />Division <br /> <br />7. (6) Floor Slabs: <br /> <br />The following measures are recommended to mitigate expansive soils: <br /> <br />Prior to placing floor slabs, subgrade soils should be scarified to a depth of 6 <br />inches, moisture conditioned, and recompacted to at least 95 percent of the <br />maximum dry density as determined by ASTM D1557. <br /> <br />A moisture barrier is recommended under all floor slabs. A plastic or vinyl <br />membrane may be used for this purpose and should be placed between two layers <br />of moist sand, each at least 2 inches thick, to promote uniform concrete curing <br />and to protect the membrane during construction. <br /> <br />Timing of Implementation/Verification <br /> <br />Prior to grading permit issuance; <br />during construction <br /> <br />Method of Verification <br /> <br />Grading plan check and field <br />inspection <br /> <br />Responsible Parties <br /> <br />Senior Plan Check Engineer, <br />Building Division; Inspection <br />Services Manager, Building <br />Division <br /> <br />JB3/S:11340001 .MM A-4 <br /> <br /> <br />