AgdaPkt 2018-05-21 Joint SA PFA - Laserfiche WebLink

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353 Main Street Apartments Redwood City, California May 1, 2018 (Original Report Doted November 78,2016) 2.lf disturbed soil, soft soil, loose fill, or debris are encountered after the removal of the upper 24 inches, additional over-excavation should be performed until identified loose undocumented fill, soft soil, or debris are removed. Once the over-excavation has been approved by the Earth Systems representative, the bottom of the excavation should be scarified, moisture conditioned, and re-compacted as described later in this section. 3.Fire lanes, flatwork, and driveways constructed close to the creek bank may need to be protected by erosion control measures on the bank such as sheet pile or retaining walls. Compaction Recommendations 1. ln general, the underlying native soil should be scarified at least 8 inches, moisture conditioned and recompacted to the recommended relative compaction presented below, unless noted otherwise. This scarification operat¡on should be performed at locations designated for proposed structural fill, concrete slabs-on-grade, foundations, and asphalt pavement areas. Recompacted native soils and fill soils should be compacted to a minimum relative compaction of 90 percent of maximum dry density at a moisture content at least 2 percentage point above optimum. Low and non-expansive soil should also be compacted to a minimum 90 percent of maximum dry density at a moisture content above optimum. ln areas to be paved, the upper 8 inches of subgrade soil should be compacted to a minimum 92 percent of maximum dry density. The aggregate base courses should be compacted to a minimum 95 percent of maximum dry density. The subgrade and base should be firm and unyielding when proof-rolled with heavy, rubber-tired equipment prior to paving. The pavement subgrade soils should be periodically moistened as necessary prior to placement of the aggregate base to maintain the soil moisture content near optimum. Fill Recommendations Structural fill is defined herein as a native or import fill material which, when properly compacted, will support foundations, building slabs, pavements, and other fills. The on- site native fill soils that are free of debris, organics and other deleterious material, may be used as structuralfill. The Bay Mud should not be used as structuralfill unless it is lime treated. lmport fill is not anticipated at the site. Should import fill be required, the soil should meet the following criteria: 2. 3 L 2 301842-001 t7 1610-038.SER.REV2 7.B. - Page 75