1212 GRAND AVE 2016-01-01 MF Import

March 31, 2008 Mr. Paul Tessicr L&A Job No. 8A027 Page 13 Oexing or pumping should be overvexcavated and rc-compacted or replaced with a strucWral fill or crushed rock placcd and compucted in accordance with the recommendations provided in the Structural Fill scction oCthis report. We recommend that a layer of 4-inch-thick minimum, compacted, crushed rock base (CRB) of 7/8-inch-minus crushcd rock, be used for the driveway area. 7'he crushed rock base should be topped with 3-inch-thick Class E3 asphalt concretc (AC) or 4-inch concretc pavement reinforccd with a laycr of welded wire fabric at the mid-depth of thc pavement. Catch basins should be installed in thc driveway to capture anJ drain away storm runoff over the paved driveway. DRAINAGE CON'TROL Building Footprint Excavation Exca�ation of building footprints of'thc additions and ncw g;uagc, if encountcring groundwatcr, should havc thc bottom of excavation sloped and ditches excavated along the bases of cut banks to direct groundwatcr seepage to Ilow into a sump pit from which watcr can be pumped out of the pit into a ncarby storni inlet. A layer of 2-inch crushed rocks should bc placed over firm subgrade soils undcr footings, as mquircd, to protect the soils from disturbance by construction equipment and foot traftic. 1'his crushed rock basc should be built to a few inches above groundwater Icvcl, but not Icss than 4 inches thick. "I'hc ctvsh rock base should be compacted in 12-inch lifis to u non-yiclding statc with a vibratory mechanical compactor. Runoff ovcr Impervinus Surfactw Storm runoff over impervious surlaces, such as roofs anJ pavcd azeas, should be collected by underground drain linc systems connected to downspouts and by catch basins installed in paved arcas. Stormwatcr thus cullccted should be tighUined to dischargc into a nearby storm sewer. LIU & ASSOCIATi ES, INC. � ' '�