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<br />5. Minimum compacted densities for e~ankment materials <br />- shall be. 95 percent of maximum dry density for ASTM 0-698 (Standard <br />Proctor) or 90 percent for ASTM 01557 (Modified Proctor), as found in <br />the 1986 'Annual Book of ASTM Standards', Section 04.08, Soil and <br />Rock; Building Stones, 1916 Race Street, Philadelphia,' Pennsylvania, <br />19103, which is hereby Incorporated by reference into this rule, and <br />does not-include later amendments to, or editions of, the incorporated <br />material. Impervious zones with clay fines shall be controlled using <br />.. Standard Proctor criteria to maintain the plastic nature of the <br />mater.el; and <br /> <br />6. The minimum density for cohesionless materials shall be <br />70 percent relative density as determined by ASTM 0-4253 and 4254 as <br />found in the 1986 'Annual Book of ASTM Standards', Section 04.08, Soil <br />and Rock; Building Stones, 1916 Race Street, Phlhdelphla, <br />Pennsylvania, 19103, which is hereby incorporated by reference into <br />this rule, and does not include later amendments to, or editions of, <br />the incorporated ..terial. ' <br /> <br />5.A. (6)(h) The methods and procedures for determining <br />slopes outlined in the 'oeslgn of Small Dams', United States <br />Department of the Interior, 8ureau of Reclamation, Second Edition, <br />1973, 1977 revhed reprint, U.S. Government Printing Office, <br />Washington, D.C.., 20402, which is hereby Incorporated by reference <br />into thh rule, and doe.s not incl ude 1 ateramendlll8nts to, or editions <br />of, the incorporated material, are acceptable for dams up' to 50 feet <br />high. For dams over 50 feet, stability analyses shall be conducted. <br /> <br />5.A.(6)(i) For earth dams, the minimum static stability <br />factor of safety (FS) under steady state conditions 15 1.5, the <br />minimum FS for rapid drawdown is 1.2, and the minimum FS for dams <br />requiring residual soil strength analysis shall be determined by the <br />State Eng ineer. <br /> <br />5.A.(6)(j) For earth dams the seismic stability criteria <br />shall be as follows: <br /> <br />5.A.(6)(j)(I) All Class I dams and Large and <br />Intermediate size Class II dams shall be designed to at least with- <br />stand the predicted earthquake loads, based upon an analysis of the <br />potentially active faults, unless sufficient investigations indicate <br />the faults are not active. Accelerations shall be determined by <br />methods acceptable to the State Engineer. <br /> <br />5.A.(6)(j)(ll) For all Class I dams, and Large and <br />intermediate size Class II dams, the minimum seismic stability <br />analysis required shall be a pseudo. static analysis which utilizes an <br /> <br />. 21 - <br />