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JOSEPH A. CESARE AND ASSOCIATES, INC., GEOTECHNICAL ENGINEERING CONSULTANTS <br />Pincomb (2003). To determine the average aggregate thickness across each lot the volume of <br />aggregate was divided by the area of the lot. This same method was used to determine the <br />average overburden thickness on the lot. Aggregate thickness contour maps and overburden <br />thickness contour maps for the parcel are presented in Appendix A. The aggregate thickness <br />contour maps are shown with and without setbacks from the boundary of the parcel. The <br />setback distance around the parcel was determined to be two times the average gravel <br />thickness of 45 feet for a set back of 90 feet around the perimeter of the parcel. The mined <br />slope was assumed to be at 1 horizontal to 1 vertical (1:1). <br />Based on our investigation and analysis, it is estimated that the portion of the West Farm <br />property considered in our investigation contains a total indicated mineral resource of 26.4 <br />million short tons of aggregates. When a setback of 90 feet is applied to the perimeter of the <br />parcel the total indicated mineral resource drops to 23.9 million short tons of aggregate. In our <br />calculations of aggregate volume the sloping gravel pit walls were also taken into consideration <br />as a loss of material. Assuming a slope of 1:1 and using the average gravel thickness along the <br />pit walls, it was determined that the loss of material due to sloping pit walls is approximately <br />450,000 cubic yards or 0.675 million short tons. The total amount of aggregate available for <br />mining, after consideration of the losses from setbacks and sloping pit walls, is 23.2 million short <br />tons of aggregate. The estimated volumes and tonnages of aggregate resource are presented <br />in Table 2. Our aggregate resource estimate does not include loss of material due to mining <br />dilution, or loss of fines during washing and processing. Samples were not tested for aggregate <br />characteristics such as hardness, durability, soundness, chemical reactivity, and specific gravity. <br />However, according to the CGS open-fire report 01-19, Koeing, 2001, deposits in the Arkansas <br />River valley have a history of producing well-sired products for construction aggregate and <br />roadbase materials. <br />TABLE 2 <br />Aggregate Volume and Tonnage <br /> <br />tti E f J •k <br /> <br />Parc <br />_ 11 ? <br />-`a,Aq <br />=Gross <br /> <br /> <br />Acreage Wrr <br />l? 7 ?G <br /> <br />Qggreate Overburdens <br /> <br />>Tfalck e ?4 ? Iilck ss eft) <br />? Q V Y <br /> <br />Matepal <br /> <br />?(NIIIIIOr CY) <br />.M.R 1 7".?IY?"'4 :v <br />Rav.Mafen <br /> <br />fi'• <br />( i©r Tons <br />Parcel1 240 45 12 17.6 26.4 <br />Parcel 1 (Setbacks) 215 45 12 15.9 23.9 <br />Parcel1 215 45 12 15.4 23.2 <br />(Setbacks & Slopes) <br />Project No. D07.090 - 06/13/07 5 <br />709OtKt