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<br />UIRTER & EI1VIIiOf1MEf1THl lYITEMI TECHf10LOGY, IfIC. <br />Catherine Kraegar-Rovey, Ph.D., P.E., C.C.E. <br />(303) 480-1579 <br />TECHNICA7 <br />TO: Peter Matthies, NCIG <br />FROM: Ed Rovey, W&EST <br />DATE: December 5, 1994 <br />RE: NCIG, Coal Ridge #1: <br />BACKGROUND <br />on <br />During April, 1994, I prepared Exhibit 4.7 - 1, "Hydrology of <br />Portal #1 Reclamation Channel", (text portion in the Appendix) <br />which addressed the flow conditions around the portal. In <br />November, 1994 you requested that i evaluate the "as-built" <br />conditions related to runoff around the portal. <br />On November 16th, I conducted a site visit to the reclaimed <br />portal #1 site. I completed the following: <br />1. Evaluated the final reclamation grading in the <br />vicinity of the reclaimed portal. Also, I <br />observed the reclamation of the access road to the <br />portal. <br />2. Verified cross sections A-A' and B-B' (copy <br />attached in the Appendix) that are across the <br />primary reclaimed flow path in the vicinity of the <br />portal. <br />3. Measured the "natural", undisturbed cross section <br />of the runoff channel just ABOVE the reclaimed <br />portal area; Figure 1 is this cross section and is <br />located about 50 feet uphill from cross section B- <br />B'. <br />4. Observed several small berms that are <br />RECEIVED <br />ut~ U g 1994 <br />iiiiuiiiiiniiiiii <br />Ed Rovay, P.E. <br />Division of Minerals & C~®Ob~93-912s <br />2914 W.29th Ave. P.O.Box 11216 Denver, Colorado 80211-0216 Fax (303) 480-1915 <br />