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MIIMiMEHAHA <br />WATERSHED <br />CREEK <br />DISTRECT <br />P.O. Box 387. Minnesota 55391 <br />MAiO or MANA6EIIS: <br />Uwrmt C. Mllty. Prtt • N Dalt Palmttttr • Robtrt B. Carroll • David H. Cochran • Jamas S Ru&sall <br />f <br />% <br />utMor <br />/ ; <br />SPECIFICATIONS FOR RIPRAP ANDy*^' <br />% *f <br />i.' <br />FILTER BLANKET*t!•sjw C- ^ <br />Scope <br />This Specification covers stone and filter blanket material <br />for use in random, grouted, or hand-placed riprap. <br />Requirements <br />Kind and Quality ~ The stone shall be durable field or quarry <br />stone of approved quality, sound, hard and free from seams, <br />cracks and other structural defects. <br />Size - The approximate average diameters (based on round <br />stones) of the various weights of stones listed below are as <br />follows; <br />WEIGHT <br />(lbs.) <br />AV. DIAM. <br />(Inches) <br />WEIGHT <br />(lbs.) <br />AV. DIAM. <br />(Inches) <br />10 <br />30 <br />50 <br />80 <br />110 <br />6 <br />9 <br />10 <br />12 <br />14 <br />150 <br />180 <br />250 <br />300 <br />400 <br />15 <br />16 <br />18 <br />19 <br />21 <br />For Random Riprap <br />Stones shall conform to the size requirements for the Class <br />specified below. <br />Class A <br />The maximum .size of stone shall have a weight of not more than <br />approximately 150 pounds. Not less than 75 percent (by weight) <br />shall be within the range of 10 pounds to 110 pounds, with an <br />average weight of 30 pounds to 50 pounds. Not less than 90 <br />percent (by weight) shall weigh over 10 pounds. <br />♦l <br />•I <br />»<*■ <br />'M: <br />11 <br />J