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<br />002G39 <br /> <br />The Final Remedial Action Plan (RAP), which is to be approved by the Department of Energy, and <br /> <br /> <br />concurred upon by the Nuclear Regulatory Commission (NRCI and the State of Colorado <br />, <br /> <br />contains the conceptual design, which was used to develop the final approved design. During <br /> <br />remedial action construction operations, there were conditions encountered which required <br /> <br />design features which were not in the conceptua~ design. These conditions and the associated <br /> <br /> <br />design changes are noted as Class I Project Interface Documents WID's), which have been <br /> <br /> <br />incorporated into the as-built design specifications. The Class I P/D's for the Durango site were <br /> <br /> <br />as follows: <br /> <br />PID No. 03-5-09. Rev, 1 !Desion criteria not chanoedl <br /> <br />From excavating field test pits in the Bodo Canyon Embankment toe area, the depth to bedrock <br /> <br /> <br />for the toe key was found to be greater than anticipated. The erosion protection toe key location <br /> <br /> <br />Nas revised accordingly and additional permanent ditches were provided. <br /> <br />PID No. 03-5-13. Rev. 1 (Aooroved bv DOE in October, 1989) <br /> <br />The Department of Energy, (DOE), verbally directed that the Durango disposal cell be redesigned <br /> <br /> <br />to a reduced capacity of two million cubic yards of contaminated material and to eliminate the <br /> <br /> <br />extensive riprap requirements along the western side of the original embankment. Additionally, <br /> <br /> <br />infiltration requirements dictated a new cover design in order to limit the contamination plume <br /> <br /> <br />emanating from the base of the disposal cell ("Recommended Cover Design for Bodo Canyon <br /> <br />Disposal Site: TAC, July 26,1988"). <br /> <br />The disposal embankment capacity with a side slope elevation at 7140 feet was roughly 2.1 <br /> <br /> <br />million cubic yards. The southwestern section of the cell was rotated northward to eliminate the <br /> <br />DlJRAHGO COMP REP.eli. EXEC S!JMMAAY 11000 H1/j", <br /> <br />2 <br />