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� altinay a Associates Inc. <br /> September 20, 1988 David N. James, AIA <br /> page 3 <br /> Subgrade for slabs should be overexcavated 6" and <br /> pea gravel installed to stop the caui�].laFy rise of <br /> seasonal qround water. <br /> If fill is necessary behind the rockery, fill and rock <br /> should be placed monolithically. ' <br /> Under tt:e structures, when and if necessary, off-sight <br /> and on-siaht fill material should be compacted to 958 <br /> of its maximum dry density as indicated in A.S.T.M. D 1557, <br /> method A. <br /> 4. An allowable foundation pressure of 1500 psf may be used <br /> when the footing is 16" wide o:�d placed on top of suitable <br /> strata, it may be increased by 208 for each additional <br /> foot of width or depth to a maximum of 2000 psf. <br /> 5. The expected total aettlement is 3/4", while the exF:ected <br /> differential settlement is 1/2". <br /> 6• Soils are moisture sensitive, therefore, roof runoff <br /> should definitely be controlled and discharqed at a point <br /> at least 15 feet away from any foundations. <br /> ROCKERIES: The attached rockery section should be used <br /> for rockeries higher than 6 ' . <br />