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r---�-�-. . <br /> � Seahorse Restaurant W-5583 <br /> 18 March 1988 Page 9 - <br />` Assuming the foundation elements are founded on the prescri6ed bearing strata or <br /> - a combination of bearing strata with the lower allowable bearing pressure used, <br /> we anticipate that total settlement should be less than 3/4 inch with differential <br /> settlments on the order of one-half of thzt total . If disturbed or soft materials <br /> are left in the footing area prior to concrete placeraent, future settlements may <br /> be greatly increased. For this reason, the condition of the footing subgrade <br /> should be evaluated by Rittenf�ouse-Zeman b Associates, Inc. prior to concrete <br /> placement to confirm that the condition of the bearing soils are consistent with <br /> those assumed during design. <br /> Slab-On-Grade , i <br /> The slab-on-grade floor subgrade should be prepared in accordance with the previous <br /> site preparation recommendations. The slab-on-grade should be founded on pre- <br /> rolled, compacted native soil or structural fill as per our recommendations outlined I <br /> previously. We recommend that floor slabs be underlain by a minimum of 4-inch <br /> thickness of clean, coarse sand and gravel , washed rock or pea gravel to serve as <br /> a capillary break. The capillary break should contain at least 40 percent (by <br /> weight) gravel-size particles larger than the U.S. No. 4 sieve. The fines content <br /> of the capillary break should be limited to 5 percent or. less. An impervious <br /> moisture barrier should also be placed beneath the slab. <br /> Drainagle Considerations <br /> The site soils rre silty and highly susceptible to disturbance when wet. Prior <br /> to construction, any site surface or ground water should be routed away from the I <br /> construction in the building areas as much as possible. Due to the perched ground <br /> water r,onditions and the close proximity of Silver Lake, we recommend that the <br /> building be provided with a perimeter footing drain system to collect available. <br /> A footing drain should consist of at least a 4-inch diameter perforated pipe fully <br /> enveloped in pea gravel or washed rock. The footing drain should discharge into <br /> a tight-line drain network away frcm the building via gravity to a storm sewer or <br /> other suitable discharge point. Site grades should be planned to provide a positive <br /> surface gradient away from the buildings and avoid ponding. Roof and surface <br />