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JD -7 Mine — Drainage Design Plan 16 <br />At the JD -7 Mine, all riprap will be installed with a granular bedding to protect underlying soils per the <br />attached Urban Drainage and Flood Control District specification for gradation and thickness (UDFCD, <br />2008) in Attachment 3. <br />If gravel mulch is required at the JD -7 Mine based on the results of the scour and velocity analysis, the <br />gravel mulch will be "composed of coarse to very coarse gravel, 16 mm to 64 mm (0.6 to 2.5 inch), similar <br />to an AASHTO No. 3 coarse aggregate" (FHWA, 2005). No bedding will be placed between the gravel <br />mulch and bare soil. <br />4149A.130926 Whetstone Associates <br />