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i <br /> <br />Erosion Management Corrections Pikeview Quarry (M-77-211) <br />Shop slope erosion: <br />Cause: When this slope was graded the soil was pushed with a dozer from the <br />top of the slope to the bottom. As a result, the thinnest soil is near the top of the slope. In <br />this local area, much of the soil layer was quite thin and over the years has thinned further <br />because of weak revegetation development. Underlying the soil is limestone waste which is <br />quite erodible on such slopes. The rills and low grade gullies you noted have developed in that <br />waste material. The problem has not expanded into adjacent land, but needs to be corrected <br />or a major storm event could severely damage land immediately downslope from the area of <br />note. <br />Correction: Correction will involve placing a thick layer of rich soil over the <br />riled areas and adjacent areas where soil thickness and vegetation cover is fairly thin. The <br />thickness will vary as the rills need to be filled. The ridges between the rills should receive <br />a minimum of four to six inches of soil. The soil will contain good quantities of woody <br />material to add strength and further control erosion. <br />The soil will be pushed as far over the slope as possible. Distribution from there will <br />be by hand, using rakes. Heavy equipment, such as a bulldozer, cannot be used to distribute <br />the soil. Once started down the slope, it would be unlikely the dozer could back up the hill. <br />That would require going all the way to the bottom of the hill. If that was done much of the <br />excellent growth downslope of the riling would be destroyed and would need to be corrected. <br />Using that process would also create a new erosion hazard that could become worse than the <br />initial problem. Once the soil is spread the area will be seeded with the same mixture <br />previously used on the rest of the slope. All of this work will be completed well before June <br />9 as a June planting would probably not be successful on this south facing slope. <br />Drainage Course Erosion: <br />Cause: When this slope was created a small low spot th the berm at the top of <br />the slope allowed water from a large thunderstorm to run down the slope. The damage, in the <br />form of a large and deep gully, was produced before the drainage path could be blocked. <br />Only minor expansion has occurred since then. <br />Correction: A large amount of soil containing woody material will be placed <br />at the top of the slope. This will be carefully pushed down the slope with a bulldozer. <br />Although the vegetation upslope from the gully will be destroyed, this is the only way to <br />repair the damage. After filling the gully with soil and branches, it, and damaged land upslope <br />from the gully, will be seeded with the same mixture used on the adjacent land. This work <br />will be completed well before June 9 as a June planting would probably not be successful on <br />this south facing slope. <br />Page 1 <br />