BC19 • Presumptive Bearing: Refer to local building codes that sometimes limit bearing capacity. Chart below from ASCE reprint of COE manual quotation of Navy NAVFAC DM7.2: Table 4-8. Pre.umptlv8 Allowable Bearing Prellures for Spread Footing. (Data from Department af the Navy 1982, Table 1, Chapter4j Booring Mcterial Mr:mive cry~tallino igneous and metamorphic rock: granite, diorite, belOit, gnein, thoroughly cemented conglomerate [sound condilion allows mioor cracbl FoIioied metamorphic rod.: slote, Khi~l (sound condition allO'Ns minor crocb) Sedimentary rock; hard cemented sholel, siltstone, sandstone, limaslorus withoul cavitie~ Wl!Qtherod or broken bod rock of any kind BJolcepl highly orgiliGalOUsrock (sholel; Rock Quality Desigootion less than 25 Compaction shale or ather highly argillaceous rock in sound coAdiHon Wellllroded mbdure of liM and ccorse-groined wil: glacial till, hardpan, boulder doy IGWoGC, Ge, SCI Grovel, gravel·sand mixtures, boulder-grCJYtlI mixtvres
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