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[7 <br />0 <br />KLEINFELDER <br />6.2.4 Final Grading Plan <br />Drawing 4 shows the final grading plan. Note that over many of the WMUs, additional fill <br />and excavation is required to form an even grade. This means that in many areas, the soil cap <br />thickness will exceed the minimum 1 -foot thickness specified. In other areas, especially <br />drainage swales, waste may be temporarily exposed. If this happens, the waste will be over <br />excavated and removed to the surface impoundments. The excavated area will then be <br />backfilled with at least one foot of clean soil. <br />6.2.4.1 Fill' Activities <br />One area that does not have a soil cap is WMU-A, which contains the surface impoundments. <br />The cap will be formed by pushing in the berms surrounding the impoundments after <br />placement of material excavated from other units, and then backfilling with additional soil to <br />reach final grade. WMU-F has elevated mounds of clean soil surrounding the pits filled with <br />asbestos waste. These mounds of soil will be pushed into the pit as part of the grading <br />r STI <br />Soil balance calculations for the site show that additional soil will be needed to reach closure <br />grades. 7-M Mfg. has decided to use clean imported soil for this purpose. Import soil <br />requirements for the individual WMUs are as follows: <br />6.2.4.2 Grade <br />Since the landfills are being closed as unclassified WMUs, grades selected for the caps are <br />approximately I%. One percent was selected as sufficient to promote drainage but not too <br />steep for paved areas that may be used for parking or equipment and material storage. <br />CR14-92-12 Page 29 of 39 24-220109409 <br />l Copyright 1992 Kteinfelder, Inc. <br />