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BPART SIXAppendix BNCMA 2ND EDITION - COULOMB METHODOLOGY LEVEL SURCHARGE - 250 PSF11) Maximum Grid TensionThe calculated grid tensions (plf) are tabulated below:q = 250 psfσh1 = (0+q)(k a )ZAreaMidpointLoad = ( σh1+ σh2)/2 x areaσh2 = (z γ+q)(k a )GRID DEPTH z σah σqh σtot Ave Area LoadTOP4) SG200 2.00’106 3.33 353MID3) SG200 4.67’190 2.67 507MID2) SG200 7.33’261 2.33 608MID1) SG200 9.33’316 1.67 528BOTTOMStrata SG200 has an allowable design capacity of 1280 plf from the first page which is greater than thecalculated value at each level. Therefore, Strata SG200 is OK for all four levels in tension.B.6