3431 NASSAU ST 2018-01-02 MF Import

04/14/04 07:18 FAX 4253476588 COnA EVERF,IT 40018/032 enloeic Inve.0 Intion and C7enteclviirnl lneinecrins IJx rr 00-02-20 qNE Corner 35 St. and Nassau St. Everett. washington presented as equivalent fluid pressures and are based on the assumption of a uniform, level, granular backfill without buildup of hydrostatic pressures behind walls. To minimize earth pressures and prevent the buildup of hydrostatic pressures, wall backfill should consist only of free draining granular materials with drainage provisions as described in section 4.7, Drainage Controls, of this report. If the backfilled walls arc structurally restrained from lateral movement. at the top, we recommend that the walls be designed for an equivalent weight of 60 pounds per cubic foot (pen to represent at rest pressures. If the tops of the walls are free to move laterally by an amount equal to at least 0. I percent of the wall height, they may he designed for active conditions using an equivalent fluid pressure of 38 pef Passive resistance is 400 per Surcharges due to sloping ground, adjacent footings or structures within 10 feet of the wall, vehicles, construction equipment, etc. must be added to these values. For modeling under seismic conditions, we recommend that a dynamic rectangular pressure increment be added to the static equivalent fluid pressure in the form of 1211 psi*. 4.7 Drainage Controls Settlement potentials will also be influenced by drainage around the exterior of the buildings. We recommend that all exterior tootings be drained by a minimum 4" diameter perforated PVC drain line laid alongside the base of the footing so as to positively drain toward an appropriate point of discharge. We recommend that the placement of footing and foundation drains be inspected and approved by GES, Inc. prior to backfiIIing the foundation elements. The footing drains should be backfrllcd with a minimum 18" of 5/8" minus washed pea gravel. Downspouts and yard drains should be tied into their own minimum 6" diameter ADS drain line placed in such a manner as to allow for positive flow of water through the drain line toward an appropriate point of discharge. Cleanouts should be provided along all drain lines in locations that allow case of maintenance and operations. 14 GES, Inc.