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-z- <br /> <br />• <br />On the basis of our test resulfi and experience, we hclievc the sandstone <br />submitted should perform reasonably :yell as u dumped riprap for surface ditches. <br />The compratively hard sandstone may weather during freeze-thu:•~ cycles. but our <br />opinion is foss of material z•I11 be very lo~v. \'le recommend the riprap thic=mess <br />be increased slightly (5 inches) to allow for this loss. <br />If you would like further assistance in evaluation of this material, or in the <br />design of the riprap gradation, thickness or bedding requirements, please call. <br />Very truly yours, <br />_~::: <br />CTL/THOP.iP50N, INC. r''.`~`;•`t Fi's~t <br />4~~<]C <br />1 1 l <br />Ronald Jvi. ;AcOmber, P.E. ~ ti~ 202~~ <br />$eni.or Engineer •'~'°" <br />`1;'. e <br />Revie:ved By: /f/ ~` ~; F""' <br />~' <br />Robert '.:'. Thompson, P.E <br />President <br />P, i~1f~1:P,cNT:gl <br />(3 copies seat) <br /> <br />