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f 1 J FML, Inc. STS Project 93589 August 28, 1985 -13- We recommend that no foundation concrete be placed in standing water or on soils loosened or softened by construction traffic. Rather, ground water seepage or rainwater accumulation as well as any softened soils should be removed prior to foundation placement. Total settlement of the foundations placed as above should be 3/4 inch or less with differential settlement on the order of one half of this amount. 3. Drainage Recommendations If the existing fi11, or imported silty or clayey fill soils are used in the berm areas surrounding the lower level walls, we recimmend that a perimeter drain system be provided to minimize the collection of seepage water of garage walls. The perimeter drain should be placed around the outside of the structure and above footing level and should consist of $ perforated or slotte 4 plastic pipe connected to a sump pit or drain into an area of lower eleva- tion. The plastic pipe should be surrounded by a free -draining granular soil and wrapped with a non -woven filter fabric to minimize migration of fines into the drain which could clog the system. All garage walls should be dampproofed. The final 12 to 18 inches of fill at grade should be a clayey soil properly com- pacted and slopedw away from the basement walls to promote drainage away from the structure. In areas where the naturally -occurring relatively clean sandy soils are to be used for berming against foundation walls, and below foundations, a perimeter drain system would not be necessary: however, the walls should be dam roofs p,P d , 4:Floor Slab Design Floor slabs based on properly placed and compacted fill can be laced �zs - - p previously discussed. The floor slabs should be isolated from foundation walls to allow for any minor differential movement between the two. We recommend that a minimum 4-inch thick granular layer be placed beneath the floor slab as a leveling course and to provide a capillary moisture break between the floor slab and underlying soil.