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(about 30% to 50%7 of the normal critical area seeding rate. This will provide a seeding of between 20 and 50 live seeds per square foot. The mixture will be the • same as that to be used on the slope. TIhEfABLE FOR C~CTIVE ACTION: "" Because the slope is west facing, seeding too early could result in a major mortality of grass seed in early winter if significant germination occurred, Therefore, grass seeding will not occur until mid to late October 1989. Tree planting will not occur until the spring of 1990. Tree planting in this area is usually safely done in mid to late April or very early May. PREVENTATIVE ACTION: Corrective action takes care of the existing problem, but without preventative action a similar incident could happen again. Therefore, Castle Concrete will take the following actions to reduce the probability of such an event occurring again. 1. Close supervision of dozer operator whenever working near the edge of a mining limit where spillage would create a problem. With such supervision, areas where rocks could be pushed over the side can be identified and special operational . adjustments made to avoid the spillage. 2. Possible use of a backhoe to work the edges of a mining limit. With a dozer, there is limited control of rock spillage available. A dozer rushes along the edge and even with the blade shifted to roll material inward like a snowplow, the outer edge of the blade can still spill outward. A backhoe, alth xrgh it can still have spillage out the sides of the bucket, has better control b~~ause it pulls up and away from the slope rather than pushing along the slope. Once the backhoe has pulled material up the slope and into the quarry area, the dozer ~=ould be used to push the material to the loading area. 3. Berming below a slope crest where spillage can occur could stop most of any spillage, especially the smaller rocks which tend to not roll ver;~ far. The berm, however, would need to be very large to stop a rock weighing se~~eral tons. That size of rock would simply need to be handled in such a way as to keep it from going over the side. 4. Cable nets to pull large rocks away from the slope crest. 'This was recently attempted with good success on the Queen's Canyon Quarry where a large rock was precariously perched m the side of the canyon. The net, after b~aing wrapped • CORRECTIVE ACTION PLAN SNYDER ROCK SPILLS PAGE 7