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    Authorized Open Erodible Area. The resident engineer will limit the amount of surface area of erodible earth material exposed at one time due to excavation, borrow fill within the project, contractor furnished borrow and excess material disposal site.

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    CHAPTER 4 DRAINAGE DESIGN 4.1 General Considerations. Roads will affect the natural surface and subsurface drainage pattern of a watershed or individual hillslope.

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    Back — The roof or upper part in any underground mining cavity. Backfill — Mine waste or rock used to support the roof after coal removal. Barren — Said of rock ...

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    Slippery Rock University Official University News. ... SRU trustees to meet March 22-23 3/19/2018. Slippery Rock University's council of trustees will meet March 22-23.

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    rate of percussive drilling. They developed a good correlation between penetration rate and a set of rock properties, but the relation was complex.

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