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<br />in pod tion atter tilling. The told on burlap bags shall be placed <br />underneath the bag for headers and agaiD8t the previously placed sack . <br />for stretchers. When the protected slope is 1 1/2: 1 or steeper, a bed <br />consisting of two rOli'S of sacks placed as stretchers shall be followed <br />by a rov ot sacks placed as headers. Succeeding rOli'S at sacks shall be <br />placed as stretchers with joints between sacks staggered. Each sack <br />shall be hand placed and pushed into firm contact with adjacent sacks. <br />On slopes flatter tIIan 1 1/2:1 all rovs after the bed rov shall be placed <br />as headers. <br /> <br />Cutoffs and weep holes shall be placed as shown on the plans or as <br />directed by the engineer. The finished work shall present a neat appear- <br />ance with parallel rOli'S at sacks, and no sacks shall protrude more than e <br />3 inches trom the tinished surface. <br /> <br />The riprap shall be pl.aced only when .the temperature is above 3501'. ! <br />and rising. It will be protected from tree zing and cured as specified <br />in section . <br /> <br />Whenever placement ot cOllcrete riprap in bags is delayed sutticient1y <br />to affect the bond between succeeding courses, a smalJ. trench about halt <br />the depth of a sack shall be excavated back of the last row of sacks in <br />place and the trench filled with fresh concrete before the next layer ot <br />sacks is laid. At the start of each day's work or when a delay at over <br />2 hours occurs during the placing of successive layers ot sacks, the pre- <br />viously placed sacks shall. be moistened and dusted with cement to develop <br />bond. <br /> <br />. <br /> <br />10-3.5 - Concrete-Slab Riprap -- Slabs at the dimensions and type, <br />plain or reinforced, shown on the plans shall be poured in place with <br />class B concrete unless otherwise specified. AJ.temate slabs shall be <br />poured and the remainill8 panels shall be poured later. <br /> <br />Unless otherwise specitied, the slabs shall be laid in horizontal <br />courses and successive courses shall break joints with the preceding <br />ones. Horizontal joints shall be normal to the slope and shall be cold <br />joints without tiller. The joints extending up the slope shall be formed <br />with 3!4-inch lumber, which shall be removed and the joint left open. <br />The slabs shall be finished with a wood fioat. <br /> <br />The pouring and curing shall be carried out as specitied for class B <br />concrete in section . <br /> <br />" <br /> <br />10-3.6 - Filter Blanket -- When required, a filter blanket shall be <br />placed on the prepared slope or area to the full specified thickness of <br />each layer in one operation, using methods which will not cause segrega- <br />tion of particle sizes within the bedding. The surface at the finished <br />layer should be reasonably even and free trom mounds or windrovs. Addi- <br />tional layers of filter material, when required, shall be placed in the <br />same manner, using methods which will not cause mixture of the material <br />in the different layers. <br /> <br />. <br /> <br />11-42 <br /> <br />. <br /> <br />~ <br />