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Control of gradation will be by visual inspection. However in the event the <br /> ENGINEER determines the riprap to be unacceptable, the ENGINEER will <br /> pick 2 random truck loads to be dumped and checked for gradation. <br /> Mechanical equipment and labor needed to assist in checking gradation shall <br /> be provided by the CONTRACTOR at no additional cost. <br /> B. Bedding: <br /> 1. Gradation for Granular Bedding <br /> U.S. Standard Percent by Weight Passing Square Mesh Sieves <br /> Sieve Size Type I Type II <br /> 3 Inch 90- 100 <br /> 1-%2 Inch <br /> 3/Inch 20- 90 <br /> 3/8 Inch 100 <br /> No.4 95— 100 0- 20 <br /> No. 16 45 - 80 <br /> No. 50 10- 30 <br /> No. 100 2- 10 <br /> No.200 0- 2 0- 3 <br /> Granular bedding designation and total thickness of bedding shall be as shown on the <br /> Drawings. Granular bedding shall meet the same requirements for specific gravity, <br /> absorption, abrasion, sodium sulfate soundness, and freeze-thaw durability as <br /> required for riprap and specified above. <br /> C. Geotextile Fabric: <br /> Where soil conditions dictate, geotextile fabric shall be placed directly on excavated <br /> slopes,channel beds, etc.prior to the placement of any riprap bedding or riprap. The <br /> extent and location of geotextile placement will be shown on the Drawings. <br /> Geotextile fabric shall be Trevira S 1120 or approved equivalent under all riprap. <br /> PART 3 EXECUTION <br /> 3.01 CONSTRUCTION REQUIREMENTS <br /> A. Channel slopes, bottoms, or other areas that are to be protected with riprap shall be <br /> free of brush, trees, stumps, and other objectionable material and be graded to a <br /> smooth compacted surface. The CONTRACTOR shall excavate areas to receive <br /> Boyd Freeman Ditch Improvements 02375-3 Riprap <br /> August 2005 <br />