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% • <br />n <br />Class B <br />The maximum size of stone shall have a weight of not more <br />than approximately 250 pounds. Not less than 75 percent (by <br />weight) shall be within the range of 10 pounds to 180 pounds, <br />with an average weight of 50 pounds to 80 pounds. Not less <br />than 90 percent (by weight) shall weigh over 10 pounds. <br />Class C <br />The maximum size of stone shall have a weight of not more than <br />approximately 400 pounds. Not less than 75 percent (by weight) <br />shall be within the range of 10 pounds to 300 pounds, with <br />an average weight of 80 to 150 pounds. Not less than 90 per­ <br />cent (by weight) shall weigh more than 10 pounds. <br />Hand Placed and Grouted Riprap <br />The individual stones, except those used for chinking, shall <br />weigh not less than 50 pounds each. <br />Filter Blanket Material <br />The filter blanket material shall be well graded gravel or <br />crushed stone and shall conform to the gradation requirements <br />for the type specified in the Plans. The gradation require­ <br />ments are as follows: <br />TOTAL & PASSING <br />Sieve Size <br />6" <br />Type 1 Type 2 <br />100 <br />3”100 75-100 <br />Ih”80-100 65-90 <br />1"75-95 55-85 <br />No. 4 50-80 35-65 <br />No. 10 35-65 25-50 <br />No. 40 5-30 5-25 <br />No. 100 0-12 0-12 <br />Sampling and Testing <br />The materials will be inspected for compliance with the fore <br />going requirements for quality, size and gradation. <br />♦Minnesota Department of Highways, St. Paul <br />• Supplemental Specifications for Highway Construction <br />January 1, 1974 <br />t. <br />f <br />t/! <br />* i <br />I <br />i <br />4, <br />i] <br />•• <br />*1 <br />C»i <br />t