1632 46TH ST SE 2020-06-18 - Laserfiche WebLink

July 3, 2017 Single-Family Residence L&A Job No. 17-079 Page 17 pressure, drainage provision, and wall backfill should be in compliance with the recommendations for proposed building foundations in this report. PAVED DRIVEWAY Performance of driveway pavement is critically related to the conditions of underlying subgrade soils. We recommend that the subgrade soils under the driveway be treated and prepared as described in the SITE PREPARATION AND GENERAL EARTHWORK section of this report Prior to placing base material, the subgrade soils should be compacted to a non-yielding state with a vibratory roller compactor and proof-rolled with a piece of heavy construction equipment, such as a fully-loaded dump truck. Any areas with excessive flexing or pumping should be over-excavated and re-compacted or replaced with a structural fill or crushed rock placed and compacted in accordance with the recommendations provided in the STRUCTURAL FILL section of this report We recommend that a layer of compacted, 7/8-inch crushed rock base (CRB), be constructed for the driveway. This crushed rock base should be at least 6 inches thick. The crushed rock base should be topped with a minimum 3-inch layer of Class B asphalt concrete(AC) surficial course. DRAINAGE CONTROL Building Footprint Excavation Footprint excavation for the proposed residence, if encountering groundwater seepage, should have bottom of excavation sloped slightly and ditches excavated along the base of cut banks to direct collected groundwater into sump pits from which water can be pumped LIU & ASSOCIATES, INC.