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In response to: Criteria for slopes on parking lots posted by Gus Drum on June 27, 2000 at 09:45:02:
My initial reaction is that someone has made a mistake in the broader planning process. Cutting a parking lot that should be at a 0.5 to 3% slope (maybe a 5% slope max since the vegetation makes it sound like ice and snow aren't an issue at the site) into a 12-15% slope is going to require major earthwork, with the accompanying runoff and erosion management issues. If the site is all that steep, the decision to put a parking lot there needs to be revisited.