5109 SOUND AVE 2017-08-02 - Laserfiche WebLink

July 21, 2014 Two Single-Family residences L&A Job No. 14-065 Page 19 We recommend that a layer of compacted, 7/8-inch crushed rock base (CKB), be placed for the driveways. This crushed rock base should be at least 6 inches thick. The crushed rock base should be overlain with a 3-inch asphalt treated base (ATB) topped by a 2-inch- thick Class B asphalt concrete (AC) surficial course or 5-inch reinforeed concrete pavement for the driveways. DRAINAGE CONTROL Building Footprint Excavation Building footprint eYcavatian for proposed residences, if encountering groundwater seepage, should have the bottom of excavation sloped slightly and ditches excavated along bases of the cut banks to direct collected groundwater into sump pits from which water can be pumped out. A layer of 2-inch crushed rock should be placed over footing bearing subgrade soils, as required, to protect the soils from disturbanee by construction traffic. This crushed rock base should be built to a few inches above groundwater level, but not less than 6 inches thick. The crush rock base should be compacted in 12-inch ]ifts to a non-yielding state with a vibratory mechanical compactor. Runoff over Impervious Surfaces Storm runoff over impervious surfaces, such as roofs and paved driveways, should be collected by underground drain line systems connected to do��vnspouts and by catch basins installed in paved drive��ays. Stormwater thus collected should be tightlined to discharge into a storm sewer or suitable stormwater disposal facilities such as infiltration trenches. LIU & ASSOCIATES, INC.