1231 MADRONA AVE 2016-01-01 MF Import

' � � Grnlo�ic Ltresfitatior� and Clentechr�ica! En�ineeri�i� Hepnrt 97-01-20 l? �J Alndrnna �i re - Lnl 3 lirere((, fl'n.sltington bearing pressures may be increased by up to 1/3 to accommodate shoR temy transient and seismic loads. Foundation areas should be excavated a minimum 12" into the appropriate bearing soil in order to acl»eve the maximum bearing support as specified above. The suitability of the exposed soil for foundation support sliould be conSrmed by GES, Inc. upon the completion of excavation and prior to tl�e placement of any foundation forms. If non-suitable soil is encountered at the designed footing deptli, overexcavation of die footing area may be required to develop the necessary bearing capacity. Overexcavated areas may be backfilled up to the desigued footing depth as directed by GES, Inc. with 2" to 4" cruslied rock. Foundation setdements will be closely related to the quality ofthe site earthwork and the degree that the native soil Uas been disturbed during construction. We estimate tliat total settlement of the foundation Ieleroents placed as recommended above will not exceed 3!4 of an inch, with differential settlements appraximately 1/2 of that total. It should be noted that actual settlement could 'vicrease if care is not Ieaercised during site development and foundation construction. !_ 4.6 Draina�e Controls l_. I Settlement potentials will also be influenced by drainage around the exterior of the building foundations. We recommend d�at all exterior footiugs be drained by a minimum 4" diameter perForated PVC drain � line laid almigside tl�e base of the footings so as to positively drain toward an appropriate point of discliarge. The footing drain sliould be back6lled with a minimum 18" oF 5/S" minus washed pea gravel. I If excessive seepage and wet soils are encowitered at tlie basement slab elevation, a subslTb drainage system may be necessary on this site. GES, Inc. cau provide recommendations for the design and � placement oftl�is system, based on observed site conditions, upon request. Tlie subslab drainage system ivay possibly be tied into tlie e�2erior footing drain system. Downspouts and yard drains sLould be tied Iiuto thcir own mininwm 4" diaroeter ADS drain line placed 'ui such a manner as to allow positive flow of watcr tlu�ough the drain line toward an appropriate point of discharge. Cleanouts sliould be provided f along all drain lines in bcations that allow ease of maintenance and operations. I I 1 GES, Inc. / y