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� <br />� � <br />o�x <br />syxv <br />HZ� <br />�e � <br />��� <br />U1 H <br />C�1 O � <br />OM <br />��8/� <br />�Y ,+ <br />t" y � <br />HH <br />g �' <br />�d� <br />��� <br />o� <br />Auqust 15, 1991 <br />Mr. Bob Norliny <br />l^� <br />Abplication <br />Beneath footings, on-grade slabs <br />and walkways <br />Retaining or basement wall backfill <br />81ab-on-arade Floors <br />G-0126 <br />Page 9 <br />� of Maximum <br />Drv Densitv <br />eF" <br />95 for top 12 inches <br />and 90 below <br />Slab-on-grade floors should be placed on firm, non-yielding <br />subgrade. In preparing the subgrade, all soil deposits containing <br />organic or other deleterious substances should be removed. <br />Subgrade soils disturbed by construction activities should either <br />be re-compacted or excavated and replaced with compacted structural <br />fill or crushed rock. Disturbed areas beneath slab-on-grade <br />floors, parking pavement and driveway should be compacted to the <br />dry density specified in the etructural Fill section above. <br />We recommend that the subqrade be proof-rolled with a piece of <br />iR heavy construction equipment, such as a fully loaded dump truck. <br />Any soft spots or disturbed areas thus detected should be re- <br />compacted or over-excavated and backfilled as described above. <br />ia <br />�� <br />r! <br />�y <br />e <br />rq <br />,R <br />To avoid moisture build-up on the subgrade, slab-on-grade floors <br />should be placed on a capillary break which is in turn placed on <br />the undisturbed subgrade. The capillary break should consist of a <br />minimum of four-inch-thick layer of free-draining gravel containing <br />no more than five (5) percent finer than the No. 4 sieve. A vapor <br />barrier, such as a 6-mil plastic membrane, placed over the <br />capillary break beneath the slab is recommended to reduce water <br />6eo Consultanta Inc. <br />a <br />�i <br />: �...� <br />