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Griffin Realty SA. Inc.-Geotechnical Investigation <br />Law/Crandall Project 70131-7-0261.0001 <br />July 8, 1997 <br />I f vinyl or other moisture-sensitive floor covering is planned, we recommend that the floor slab in <br />those areas be underlain by a capillary break consisting of a vapor-retarding membrane over <br />a 4-inch-thick layer of gravel. Two-inch-thick layers of sand should be placed above and below the <br />membrane to decrease the possibility of damage to the membrane and reduce slab curling. We <br />suggest the following gradation for the gravel: <br />Sieve Size Percent Passing <br />%4"90-100 <br />No. 4 0-10 <br />No. 100 0-3 <br />A low-slump concrete should also be used to minimize possible curling of the slab. Care should be <br />taken during the placement of the concrete to prevent displacement of the sand. The concrete slab <br />should be allowed to cure properly before placing vinyl or other moisture-sensitive floor covering. <br />6.7 PAVING <br />An R-value of 20 was assumed for design of asphalt paving based on our observations and <br />experience with similar soil conditions. The R-value should be confirmed during grading. <br />Assuming that the paving subgrade will consist of the on-site or comparable soils compacted to at <br />least 90% as recommended in the following section on grading, the minimum recommended <br />paving thicknesses are presented in the following tables. The asphalt paving sections were <br />determined using the flexible pavement design procedure used by the Orange County <br />Environmental Management Agency. The Portland Cement Concrete (PCC) paving sections were <br />determined using the Portland Cement Association design method; base course beneath the PCC <br />paving is not required. <br />15