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5.9.4.3.5.3 Have slots or perforations that are filter compatible with the <br />surrounding free-draining 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 />5.9.4.3.5.4 Be installed in such a manner to be accessible for internal camera <br />inspection and repair. <br />5.9.4.3.5.5 Be designed to flow with a water depth no greater than'/ of the <br />diameter of the pipe for the estimated seepage flows. <br />5.9.4.3.5.6 Be no smaller than 6 inches in diameter. <br />5.9.4.3.5.7 Discharge into locations where discharge flows can be evaluated and <br />monitored, such as galleries, manholes, or daylight (ground surface) areas. <br />5.9.4.3.5.8 Be inspected after a maximum of 3 to 5 feet of fill placed over pipe, <br />and again after remaining fill has been placed. <br />5.9.4.3.5.9 Be equipped with rodent screens in locations where the discharge <br />ends of the pipes are accessible to animals. <br />5.9.4.3.5.10 Be designed with multiple discharge points in order to isolate <br />seepage to various sections of the dam and foundation. <br />5.9.4.3.6 Geosynthetics - The use of geosynthetics shall be evaluated by the State <br />Engineer on a case-by-case basis for each dam. Geosynthetics materials shall be used <br />in accordance with the manufacturers' recommendations and intended use for each <br />product. Use of geosynthetics shall comply with the following general design <br />considerations: <br />5.9.4.3.6.1 Geosynthetics will not be accepted where the geosynthetic is the sole <br />element employed to perform a function that is an element of the dam were failure <br />of the geosynthetic, could result in a catastrophic release of the reservoir. <br />Redundant design features are required whenever geosynthetics are used for these <br />functions. <br />5.9.4.3.6.2 The use of a geotextile as a filter layer may be allowed if the <br />geotextile is placed such that it does not jeopardize the stability or safety of the <br />dam or appurtenant structures due to failure of the geotextile (such as clogging), <br />and the geotextile can be repaired or replaced without jeopardizing the stability or <br />safety of the dam. <br />30