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<br />comprising the filter blanket shall be composed of tough, durable <br />particles, reasonably free frcm thin}t1at,and e10nsated pieees, and <br />shall contain no organic matter nor soft, friable particles in quanti- <br />ti ties in excess of those approved by the engineer. <br /> <br />10-3 - Construction Details <br /> <br />Slopes to be protected by riprap shall be free of brush, trees, <br />stumps, and other objectionable material and be dressed to a smooth sur- <br />tace. All soft or spongy material shall be removed to the depth shown <br />on the plans or as directed by the engineer and replaced with approved <br />material. Filled areas will be compacted as specified for Embankmellts, <br />section . A toe trench as shown on the plans shall be dug and main- <br />tained until the riprap is placed. <br /> <br />Protection for structure foundations shall be provided as early as <br />the foundation construction permits. The area to be protected shall be <br />cleaned of waste materials and the surfaces to be protected prepared as <br />shown on the plans. The type at riprap specified will be placed in <br />accordance with these specificatioDB as modified by the special provisions. <br /> <br />When shown on the plans, a filter blanket shall be placed on the <br />prepared slope or area to be provided with fOUDdation pro'tecticm as <br />speCified in seetion 10-3.6 before the stone is placed. <br /> <br />10- 3.1 - Dumped Riprap -- Stone tor riprap shall be placed on the <br />prepared slope or area in a manner whieh will produce a reasonably <br />well-graded mass at stone with the minimum practicable percentage at <br />voids. The entire mass of stone shall be placed so as to be in eOlltorm- <br />ance with the lines, grades, and thicknesses shown on the plans. Riprap <br />shall be placed to its full course thiekness at one operation and in such <br />a lIl8IIIIer as to avoid displacing the under1yill8 materia1. Placing ot riprap <br />in layers, or by dumping into chutes, or by similar methods likely to cause <br />segregaticm will not be permitted. <br /> <br />The larger stones shall be well distributed and the entire mass <br />of stone shall cantorm to the gradation specified in sectiOll 10-2.1. <br />All material going into riprap protection shall be so placed and dis- <br />tributed that there will be no large accumulations of either the larger <br />or smaller sizes of stone. <br /> <br />It is the intent of these specifications to produce a fairly compact <br />riprap protection in which all sizes of material are placed in their <br />proper proportions. Hand placing or rearranging of individual stones by <br />mechanical equipment may be required to the extent necessary to secure <br />the results specified. <br /> <br />11-40 <br /> <br />. <br /> <br />.. <br /> <br />. <br /> <br />$ <br /> <br />. <br /> <br />. <br />