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• moist to wet and light brown to gray in color. Samples of the fill materials generally classified as CL to <br />CL-CH soils in accordance with the Unified Soil Classification System. <br />A layer of natural clays was encountered below the fill materials in four of the test holes. The clay layer <br />generally ranged from 5 to 18 feet in thickness. The clays were slightly sandy to very sandy with <br />sandstone fragments, low to moderately plastic, stiff to very stiff, moist to very moist and brown to black to <br />gray in color. Samples of the clays generally classified as CL soils in accordance with the Unified Soil <br />Classification System. <br />A layer of weathered claystone materials was encountered below the existing fill materials or natural clays <br />in six .of the test holes. The layers of weathered claystone materials ranged from 5 to 12 feet in thickness. <br />The weathered claystone materials were nil to slightly sandy, moderately to highly plastic, blocky, highly <br />fractured, moist and brown to gray in color. Samples of the weathered claystone materials generally <br />classified as a CL to CH soils in accordance with the Unified Soil Classification System. <br />claystone-shale bedrock was encountered below the clays and/or weathered claystone materials at depths <br />ranging from 20 to 37 feet beneath the existing ground surface. The claystone-shale bedrock was nil to <br />slightly sandy, moderately to highly plastic, hard to very hard, slightly moist to moist and gray in color. <br />The claystone-shale bedrock materials generally classified as CH, CL and CL-CH soils in accordance with <br />the Unified Soil Classification System. <br />The unconfined-compressive strength test results indicate that the existing fill materials exhibited <br />unconfined-compressive strength values ranging from 880 to 2,450 psf; whereas a sample obtained from <br />the existing fill materials that were compacted to 97 percent of the maximum standard Proctor density and <br />approximately 2 percent over the optimum moisture content exhibited an unconfined-compressive strength <br />of 4,850 psf. The natural clays exhibited strength values ranging from 1,950 to 3,450 psf. The weathered <br />claystone materials exhibited unconfined-compressive strength values ranging from 3,050 to 5,920 psf and <br />the claystone-shale bedrock materials exhibited unconfined-compressive strength values ranging from <br />5,210 psf to 9,910 psf. The laboratory test results, including the unconfined-compressive strength test <br />values, are shown in Table 1. <br />Free groundwater was encountered in all of the test holes at the time of drilling and in one of the test pits at <br />the time of excavation. The groundwater was encountered in the test holes at depths ranging from 6 to 37 <br />~/z feet beneath the existing ground surface at the time of drilling. However, when measured 1 to 73 days <br />after the drilling was completed, the groundwater was encountered anywhere from 1 to 21 feet beneath the <br />existing ground surface in the test holes that were cased. In test hole 3, the groundwater was flowing out <br />of the top of the PVC pipe that was situated approximately 2 'h feet above the existing ground surface <br />Job Number: 07-7600 NWCC, Inc. Page 5 <br />