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f <br /> GENERAL SPECIFICATIONS - RIPRAP CATEGORY • � <br /> DETAIL OF STANDARD RIPRAP CONSTRUCTION <br /> HENNEPIN COUNTY ENVIRONMENTAL SERVICES <br /> Replenish Existing Riprap per Details <br /> Listed Below. Existing amount of riprap <br /> will vary. <br /> .............................................................................................................................................................................................................................. <br /> �. ]00 yr floodplain elevation 931.5 <br /> . <br /> �� <br /> , <br /> � .� ...................................................2........o,>........................................................................................................................................... <br /> � • Ordinary High Water Level 929.4 <br /> Bury filter cloth lead at least 12" •..�� <br /> . <br /> as shown in any exposed soil areas. � <br /> .� <br /> • Riprap shall be mixed Class 3/4 granite riprap. <br /> • Toe boulders will not be touched. Existing slope will not be <br /> graded or changed and should maintain a 3:1. Riprap is only to be <br /> replenished by setting on existing toe boulders to the top of bank. <br /> • Riprap shall not extend higher than the top of bank, above the l 00 <br /> year floodplain elevatio�l, and/or will be installed at a lower Depicts existing riprap and <br /> elevation to match an existing shoreline contour as directed by toe-boulders. <br /> County personnel. <br /> • Riprap to be replenished at a ininimum of 1'-0"thick above 929.4 Depicts granite riprap <br /> and a maximum of 1'-6"thick below elevation 929.4. replenishing. <br /> • No riprap to extend more than 5 ft waterward of OHW or down <br /> slope into the navigational area of the channel. lf any falls into <br /> channel, it must be removed. <br />