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Rnckm.r Dulnil.S%�eci/ica�inns• 1a-11-I il <br /> .-' !lnuiouvnd%'err'acc Rur6trv <br /> :I�J�urn. II'n.ehin�;(ar <br /> 8. I�oids <br /> Rock selection and placement sl�all be such tliat diere will be minimum <br /> voids and, in the exposed face, no open voids over sia (6) wcLes across in <br /> any direction. After setting each course of rock, all voids between the <br /> rocks shall be chinked on the back witli quarcy rock to eliminate any void <br /> su�c��nt to pass a two-inch square proUe. <br /> 9. Drainage Lm�er <br /> A drainage layer shall be installed between the rear face o£the rockery uid <br /> tl�e solid face ofthe soil being protected. This drainage layer shall be at <br /> (east twelve (12) inches thick (18 inches tluck for walis greater than eight <br /> Feet in heiglu). It shall be wmposed of 4" - 6" crushed rock quarry spalls. <br /> Tlie material shall be placed in lifts to an elevation approximately six (6) <br /> inclies below tl�e top of each course of rock as tliey are being placed, wuil <br /> tl�e uppermost course is placed. Any material spilled onto tlie surface of <br /> the exposed rock course si�all bc removed before s�tting tl�e next course. <br /> If tlie exposed soil face contains materials witl> > 5% fines passing thed <br /> #200 sieve, a high strengtU, durable filter fabric shall be placed between tl�e <br /> drainage layer and tl�e protected soil face to limit tUe transfer of fines into <br /> d�e drainage layer. <br /> IV Gli.l, !n�•. <br />