3333 NASSAU ST 2024-08-07 - Laserfiche WebLink

October 3, 2016 Single-Family Residence L&A Job No. 16-124 Page 18 compacted in accordance with the recommendations provided in the S 1RUCTURAL FILL section of this report. We recommend that a layer of compacted, 7/8-inch crushed rock base (CRB), be placed for the driveway. This crushed rock base should be at least 4 inches thick. This crushed rock base should be topped by a 3-inch-thick 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 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 disturbance 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 lifts to a non-yielding state with a vibratory mechanical compactor. Runoff over Impervious Surfaces Storm runoff over impervious surfaces, such as roofs and paved driveway, should be collected by underground drain line systems connected to roof downspouts and by catch basins installed in paved driveway. Stormwater thus collected should be tightlined to discharge onto a energy-dissipating rock spall pad constructed at the gully bottom. LW & ASSOCIATES, INC. '2:3