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<br />• The culvert excavation will be backfilled and compacted in <br />lifts not exceeding 2 feet in thickness to the extent possible <br />wfth the excavation equipment; <br />• A trapezoidal channel with bottom width and depth greater <br />than or equal to the culvert diameter, following riprap <br />placement, will be maintained or reestablished at the same <br />location and general orientation of the culvert; <br />• The ends of the trapezoidal channel will be graded to <br />blend with both upstream and downstream drainage <br />channels and channel sideslopes will be graded to provide <br />for effective vehicular access; and <br />• Minimum 3-inch riprap material will be placed in the <br />vehicular crossing areas, and remaining disturbance areas <br />will be revegetated consistent with Rockcastle's approved <br />Reclamation Plan. <br />PIT 4 <br />• Responses to outstanding concerns for the Pit 4 area were previously <br />addressed in a separate submittal. <br />7 <br />IggD <br />PENDING ISSUES FROM THE OCTOBER 23. 1991 LETTER <br />1) Please respond to issue !!l.1. <br />Response: Question 111.1 requests the following changes in previously <br />submitted information or submittals of supplemental information: <br />• Rerun sediment loss comparison for Pit 3 area to <br />incorporate revised input parameters (Division's 4/24/91 <br />fetter, Comment VII.22). <br />• Provide permanentimpoundmentdocumentationforPonds <br />2 and 5/6 per the Division's 10/23/90 adequacy letter. <br />• Provide permanent impoundment documentation for Pond <br />4 consistent with applicable regulatory requirements. <br />-14- <br />