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Mr. Burke Lokey -4- December 9, 1983 <br />Also, due to the extreme severity of this site, the Division <br />recommends the following seed mixture. The Division has taken the <br />seed mixture presented in this exhibit and added a number of <br />species to increase the potential for successful reclamation at <br />this site. The rate For seeding is based upon the Soil <br />Conservation Service recommend 40 seeds per square foot (seeds/sq. <br />ft.) drill rate and 80 seedslsq. ft. broadcast rate. <br /> Pounds Pure Live Seed <br /> Per Acre (lbs. PLS/AC) <br />S ecies Drill Broadcast <br /> <br />Crested Wheatgrass 1.0 2.0 <br />Siberian Wheatgrass 1.5 3.0 <br />Streambank Wheatgrass 1.5 3.0 <br />Thickspike Wheatgr<~ss 1.5 3.0 <br />Sand Dropseed 0.1 0.2 <br />Indian Ricegrass 1.5 3.0 <br />Russian Wildrye 1.0 2.0 <br />Fourwing Saitbush 1.5 3.0 <br />Rubber Rabbitbrush 0_5 1_0 <br />10.1 20.2 <br />2. Wright Draw Gravel Pit, File No. 83-215: To prevent headward <br />erosion and downstream sedimentation at this site, the County <br />should commit to sloping the drainageway at the inlet and outlet to <br />no steeper than lOh:ly. Also, the upstream part of this pit <br />(drainage) will have to be riprapped to prevent headward erosion. <br />For the downstream portion of this pit, no riprap is necessary if <br />no ponding structure is created in the drainage. However, if a <br />ponding structure is created, the area from the edge of the pit <br />downstream must be riprapped. This rlprap is needed to dissipate <br />the water's energy and to insure a breach in the ponding structure <br />does not occur. <br />3. Lumsden Canyon Gravel Pit, File No. 83-216: The text for <br />gravel pit No. 1 spe~cifles the existing slopes should not be <br />disturbed since they blend in with existing slopes and have some <br />vegetation growing on them. Latter on the same page, however, it <br />mentions the material from two waste rock plies should be buried in <br />these side slopes. Please clarify this apparent discrepancy. <br />4. Lumsden Canyon Gravel Pit, File No. 83-216: The seed mixture <br />proposed for pits No. 1 and No. 2 Incorporate grass species that <br />are somewhat difficult to establish. Also, the seed mixture <br />proposed far exceeds the SCS recommended 40 seeds/sq. ft. drill <br />rate or 80 seeds/sq. ft. broadcast rate. The following seed <br />mixture modifies the seeding rate to conform with the SCS <br />recommendations and incorporate some extra grass species. <br />