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<br />0027J1 <br /> <br />3. Eliminating the Type A Riprap wedge that separates the rooting medium from the Riprap <br />Type B. <br /> <br />4. Extending the rock soil matrix over the top of the bedding wedge and up to the Type B <br />Riprap. <br /> <br />5. Top slope tolerance increased to 1.50 - 2.00 percent. <br /> <br /> <br />(Class 11 PIO 03-5-37 revised the thickness to 2'-6" for rooting medium/frost protection), <br /> <br />PIO No. 03-5-30, (initiallv issued as Class 11 chanoe, approved as Class I bv DOE in June. 1994). <br /> <br />The original design assumes that outlet Toe Trench No. 1 would extend down to keep a <br /> <br /> <br />minimum of 2 feet into bedrock. Investigations showed the bedrock to be 20 to 30 feet below <br /> <br /> <br />the design bottom of outlet Toe Trench. Calculations allowed a new design depth of 15 feet, <br /> <br /> <br />Jased on the worse case erosion depth predicted. <br /> <br />PIO No. 03-5-36 (Aoproved bv DOE in Julv, 1990) <br /> <br />The specification for rock-soil matrix was evaluated as difficult from a constructibility standpoint. <br /> <br /> <br />Mixing three different materials and meeting a stringent gradation for in-place product was <br /> <br /> <br />expensive and difficult to achieve. <br /> <br />The specification Section 02937, Subsection 2.3 was revised to read as follows: <br /> <br />"The material for the rock-soil matrix placed on the top slope shall be obtained by <br /> <br />thoroughly mixing the following materials at the prescribed ratios: <br /> <br />DLlRA.NGO COMP fl.EP-8/tl.04 E:J:EC SVMMAAV "000 Ii 11,... <br /> <br />4 <br />