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1206 & 1206 1%2 S Newhope St - Soils Report
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1206 & 1206 1%2 S Newhope St - Soils Report
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6/28/2021 8:33:36 AM
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6/28/2021 8:31:36 AM
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Soils Report
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1206 S Newhope St
1206 1/2 S Newhope St
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New building slabs-on-grade should be minimum 5 inches thick. reinforced with #4 re-bars at <br />I 2-inches on-centers both ways. or equivalent. placed at mid-height of the slab. <br />New slabs should be underlain by a 4 inch thick layer of clean sand. For moisture sensitive floor <br />areas. the slabs should be underlain by minimum l0-mil polyethylene moisture barrier (such as <br />Visqueen). Note: our recommendations are only minimum. The capillary break-/vapor barrier in <br />accordance with the city requirements and or applicable Califomia Building code / Cal Creen <br />Code will govem and should be followed. ln addition. the entire slab system including the <br />capillary break/vapor barrier must be properly designed by the civil / structural design engineer <br />of record (but not the geotechnical engineer) and be reviewed and approved by the city prior to <br />construction- <br />To reduce the potential for excessive cracking. new exterior concrete slabs-on-grade. if any. <br />should be minimum 4 inches thick. provided with construction or weakened plane joints at <br />frequent intervals (e. g.. every 6 feet or less). Provision of a 2-inch thick layer of crushed rock. <br />gravel. or clean sand to be placed beneath the slabs and/or reinforcement. such as #3 rebars at l8 <br />inches on-centers, or equivalent, placed at the mid-height of the slab should be considered. The <br />subgrade soils lor the exterior slabs should be properly recompacted. <br />Slab Subgrade Pre-Saturation <br />Due to the low expansion polential of the on-site soils. presaturation of the slab subgrade earth <br />materials is not considered necessary. However. sprinkling with water the slab subgrade earth <br />materials, prior to concrete pour/placement of moisture barrier membrane should be considered. <br />Other Recommendations fbr R educins Slab Crackins <br />While not a geotechnical issue. the potential lbr slab cracking may also be reduced by caret'ul <br />control of water/cement ratio and slump of concrete. The contractor should take appropriate <br />curing precautions during the pouring of concrete in hot weather to reduce cracking of slabs. <br />A slip sheet (or equivalent) can be utilized if grouted tile, marble tile. or other crack-sensitive <br />floor covering is planned directly on concrete slabs. <br />Scttlement <br />The total settlement of I inch and a differential settlement of l/2 inch over a horizontal distance <br />of 40 feet which are considered tolerable for residential buildings are anticipated and would <br />occur during the construction stage. <br />New Driveway <br />The minimum section required by the govemmental agency can be used for a new driveway. if <br />any. If there is no minimum requirement by the governmental agency. a 6-inch thick concrete <br />slab. reinforced with #3 rebars at l8 inches on-centers, 6 in. thick asphalt concrete, or equivalent <br />placed at mid-height ofslabs, over a 4-inch thick layer of aggregate base (AB) can be used. The <br />Page 6 <br />Nerv Exterior S labs-on-Grade
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