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wcathering and it shall be suitable in all respects far thc purposc <br />intendcd. <br />• Rubble .oncrete mny be used provided it has a density of at least I50 <br />pounds per cubic foot, and othenvisc meels the requirement of this <br />standard and specification. <br />• A lining of cngineering filter fabric (geotextilc) shall be placed <br />bcnvicen thc riprap and the undcrlying soil surface to prcvent soil <br />movemcnt imo or through thc riprap. Thc geotestile should be kcycd <br />in at thc top of the bank. <br />• Filicr fabric shall not bc uscd on slopcs grcatcr than I-12:1 as slippage <br />may occur. It should bc uscd in conj�nction with a I:�ycr of coarsc <br />aggreg�tc (granular filtcr hlankct) whcn thc riprap to be placcd is 12 <br />inchcs and I;irgcr. <br />4-64 Volume 11— Consfrucfion Slormwafer Pollution Prevenfion February 2005 <br />