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C~ <br />• <br />Claystones and clays make up the remaining 10 to 15 percent of <br />the overburden in the drill cores. This material occurs in thin <br />beds and is occasionally laminated. The clay will readily dis- <br />integrate when exposed to weathering. Its physical properties <br />include an approximate weight of 2,800 pounds per bank cubic <br />yard and a swell factor of 33 percent. <br />Chemical analysis with accompaning lithologic logs will be sup- <br />plied and may be found in the "confidential" book under separate <br />cover. This information has been nominated as sensitive to the <br />project and, therefore, not available for public viewing. <br /> <br />