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1 <br />EkHIBIT D (Cont'd.) <br />1 <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br />1 <br />The clay to be mined is overlaid by a medium- to course-grained <br />sand with an occasional interbedded stringer of pebbly courser <br />material. The sand varies in thickness from two to twenty-two <br />feet. It is very permeable and poorly consolidated. In a year <br />where there is an average or above average amount of snow and <br />rainfall, the lower parts of the sand will retain small amounts <br />of water. The contact between the unconsolidated sand and the <br />clay is the bottom of the water because o.f the relatively imper- <br />meable nature of the clay. This interface between the clay and <br />the sand tends to act as a conduit for the small amounts of water <br />in the sand. In a completely irregular and unpredictable pattern, <br />depending on lateral facies changes within the sand, there may be <br />no water in the overburden, or water may exist as much as five <br />feet above the sand-clay contact. As the mining proceeds and a <br />face is exposed, sometimes water will seep from the contact zone. <br />The amount of water is so small that there is no problem in <br />draining it away from the working face and holding it in a tiny <br />pond for evaporation. When final grading is in progress, these <br />seep line areas will be backfilled, resoiled and seeded. It has <br />been our experience that this method stops this kind of seepage. <br />All of these small areas will be tied to existing drainage as <br />they are under existing• conditions. <br />As operations begin on each stage, the soils and overburden <br />will be removed and segregated. Some soils will be stored on <br />pit perimeter areas as shown on ?Sap Exhibit D-1. The remainder <br />10 <br /> <br />