ENFORCE37753 - Laserfiche WebLink

Home Browse Search

~l (about 30% to 50%) of the normal critical area seeding rate. Thi=_. will provide a seeding of between 2U and 50 live seeds per square foot. The mixture will be the same as that to be used on the slope. TIhETABLl= FCR CCf?RECTIVE ACTION: Because the slope is west: facing, seeding too early could result in a major mortality of grass seed in earl) winter if significant germination occurred. Therefore, grass seeding will not occur until mid to late October 1989. Tree planting will not occur wtil the spring of 1990. Trees planting in this area is usually safely done in mid to late April or very early Maki, PREVErlTATIVE ACTION: Corrective action takes care of the existi+ig problem, but without preventative action a similar incident could happen again, Therefore, Castle Concrete will take the following actions to reduce the prd~ability 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 pushes along the edge and even with the blatle shifted to roll material inward like a sna..plow, the outer edge of the blade can still spill outward. A backhoe, although it can still have spillage out the sides of the bucket, has better cmtrol because it pulls up and away from the slope rather than pushing al mg the slope. O,ce the backhoe has pulled material up the slope and into the quarry area, the dozer could be used to push the material to the loading area. 3. Harming below a slope crest where spillage can occur ccauld stop most of any spillage, especially the smaller rocks which tend to not rol:. very far. The berm, however, would need to be very large to stop a rock weighing several 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 treat. This was recently attempted with good success ai the Queen's Canyon Quarry where a large rock was precariously perched m the side of the canym_ The net, after being wrapped . i J J COZf2ECTIVE ACTION PLAN SNYDER ROC7C SPILLS PAC£ '7