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terrain model created from the test boring data. They are not from average depths or <br />thicknesses applied to generalized areas as is commonly done. Hence, the reserves <br />reported in Exhibit D for each mining phase reflect variable overburden thickness and <br />depth to bedrock for that phase based on the digital terrain model that was developed <br />from the test boring data included herein. <br />In addition to collecting the test boring information, limited geotechnical <br />laboratory testing was performed on selected overburden samples to collect geotechnical <br />information for possible use in future earthwork backfill activities for reclaiming the <br />upland areas above the 100-year floodplain. A total of eight composite overburden <br />samples from eight of the 34 test borings were submitted for 4200 wash sieves and <br />Atterberg Limits tests to determine their sand content and plasticity characteristics. <br />Standard moisture/density relationship (Proctor) tests (ASTM D698) were run on two of <br />the eight overburden samples submitted to the lab. A summary of the lab test <br />assignments and lab testing results are included at the end of this exhibit. Overburden <br />soils at the site varied from fat and lean clay with sand (CH) to sandy lean clay (CL) and <br />clayey sand (SC). The two standard proctor tests indicated maximum dry unit weights of <br />approximately 98 and 111 pcf, at approximately 23 percent and 16 percent moisture <br />contents, respectively. <br />46