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5.9.4.3.1.11 Seepage through the embankment, abutments, and foundation shall <br />be controlled to prevent internal erosion and external sloughing. <br />5.9.4.3.2 Compaction Requirements - Material compaction requirements shall meet <br />the minimum requirements: <br />5.9.4.3.2.1 Minimum compacted density for embankment materials shall be 95 <br />percent of maximum dry density for ASTM D698 (Standard Proctor) or 90 <br />percent for ASTM D1557 (Modified Proctor), as found in the 2006 "Annual Book <br />of ASTM Standards", Section 04.08, Soil and Rock; 100 Barr Harbor Drive, West <br />Conshohocken, PA 19428, (later amendments, editions or subsequent publications <br />not included). Impervious zones with clay fines shall be controlled using <br />Standard Proctor criteria to maintain the plastic nature of the material; and <br />5.9.4.3.2.2 The minimum density for cohesionless materials shall be 65 to 75 <br />percent relative density as determined by ASTM D4253 and D4254 as found in <br />the 2006 "Annual Book of ASTM Standards," Section 04.08, Soil and Rock; I OC <br />Barr Harbor Drive, West Conshohocken, PA 19428, (later amendments, editions <br />or subsequent publications not included). <br />5.9.4.3.3 Rock Riprap - Rock Riprap shall be well graded, durable and sized to <br />withstand design wave action or channel velocities, and shall be placed on a well- <br />graded pervious sand and gravel bedding or geotextile fabric. Soil cement for erosion <br />protection may be used in lieu of rock riprap, but shall be designed and constructed in <br />accordance with standards acceptable to the State Engineer. Slope protection for <br />wave action is required to be provided on the entire upstream face of the dam, unless <br />lesser coverage is justified based on engineering analysis and reservoir operational <br />criteria and approved by the State Engineer. <br />5.9.4.3.4 Filters and Drains - The design of all drains, filter blankets, and toe drains <br />shall be performed in accordance with Rule 5.9.4.2 and must be acceptable to the <br />State Engineer. <br />5.9.4.3.5 Internal Drain Pipes - Pipes to collect and distribute seepage flows from <br />internal filters and drains shall: <br />5.9.4.3.5.1 Be comprised of material that is non-corrodible and non-collapsible <br />for the estimated overlying earth pressures and anticipated settlement or ground <br />movement associated with dam construction. <br />5.9.4.3.5.2 Be surrounded with free-draining material that is filter compatible <br />with the surrounding earth material in accordance with current filter criteria of <br />such organizations as the Natural Resources Conservation Service, the U.S. <br />Bureau of Reclamation, and the U.S. Army Corps of Engineers. <br />29