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The stabilization of lateral berms should be accomplished when mining <br />reaches the berm location. When the lateral berm is proposed imme- <br />diately upstream or downstream of an existing gravel pit, the stabili- <br />zation proposed in this section must be implemented prior to the <br />initiation of mining operations adjacent to the berm. When no mining <br />has occurred downstream or upstream, the berm may be stabilized when <br />mining reaches the berm location. <br />2.5.1 Type A Lateral Berms <br />Type A lateral berms are berms between adjacent gravel pits. <br />Spacing between Type A lateral berms shall not exceed ll1 mile <br />as measured longitudinally along a river or a stream channel. <br />These berms must be protected against headcutting to withstand <br />overtopping during the 100-year flood. Erosive forces on the <br />upstream face of lateral berms will be minimal with the excep- <br />tion of wave action caused by winds across the gravel pit's <br />water surface. The means for stabilizing the downstream face <br />of the lateral berms are similar to those required to stabilize <br />the pitside face of riverside berms and are as described in <br />Section 2.5.3 - Protection of Lateral Berms. <br />2.5.2 Type B Lateral Berms <br />Type B lateral berms also are berms between adjacent gravel <br />pits. These berms differ from Type A lateral berms in their <br />spacing. Type B lateral berms are located at major arterial <br />road crossings as opposed to every half mile. These berms are <br />intended to provide a greater level of protection than the Type <br />A lateral berms. This will be accomplished in part by the <br />arterial road itself. The means for stabilizing the downstream <br />face of Type B lateral berms are similar to those for Type A <br />UDSFCD GRAVEL GUIDELINES 12/17/87 <br />2-26 <br />