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<br />0327 JO <br /> <br />extensive riprap in this corner and the ditch along the southern side of cell was, extended to the <br /> <br /> <br />western edge. The cover design was based on the conceptual layout developed by the Technical <br /> <br />Assistance Contractor (TAC} to address infiltration requirements. <br /> <br />PID No. 03-5-22 (Aooroved bv DOE in November, 1989) <br /> <br />The developed seep along the eastern slope of the disposal embankment made the surface <br /> <br /> <br />unsuitable for placement of cover material. Re-occurrence of the seep may have developed after <br /> <br /> <br />the cover was installed. A toe drain was installed to allow the region to remain dry during <br /> <br /> <br />completion of the cover and to prevent a re-emergence of the seep along the eastern slope. <br /> <br />PIO No. 03-5-26 (Aoproved bv DOE in March, 1990) <br /> <br />Vith the overall objective of improving on the design and reducing construction costs, design <br /> <br /> <br />changes and modifications were required for the top embankment cover and tie-in on the top <br /> <br /> <br />cover to the northern swale. Additionally, the key trench side slopes were too steep for <br /> <br />placement of bedding and riprap. <br /> <br />The design changes and modifications of the top embankment cover and tie-in details were as <br />follows: <br /> <br />Too Embankment Cover <br /> <br />1. Gradation of the 6" drain and filter layer above the bentonite material. <br /> <br />.' 2. Thickness of 3'-0" rooting medium/frost protection layer. <br /> <br />--- ,_~", r'......u...Ay I ,l\ntl M1lin <br /> <br />3 <br />