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Merila and Associates STS Project 93492 December 19, 1984 -11- Retaining Wall Design The retaining wall supporting the north drive adjacent to the proposed counterfort wall. The structure should be designed as a cantilever or base of th is wall could be considered a shallow foundation, subject to ined load. The foundation must be large enough to an eccentrically incl reduce the bearing stress to within the limits of the bearing capacity of the underlying soil, resist sliding along the foundation base and resist overturning or rotation around the toe of the wall. The retain- - in`9 wall foundation should be based at least 4 ft below the proposed e side to prevent frost penetration. Based final grade on the down -slop _ on the borings performed closest to the location of this proposed retaining wall, there is to be.an excavation of unsuitable subbase soils which could result in the retaining wall being placed primarily on structural fill. Structural fill used beneath this retaining wall foundation should be placed and compacted in a manner similar to that for building foundations as discussed previously. The retaining wall should be provided with a drain tile system and with weep holes through the wall to allow drainage of the backfill material in order to prevent the buildup of hydrostatic pressures. Granular soil should be used behind retaining walls and should be placed on a suitable non -organic subbase soil in lifts not to exceed approximately 9 inches in loose thickness and be compacted to within 95% of the maximum dry density as determined by the Modified Proctor method.