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Erosion and Sediment Pollution Control Program Manual.pdf

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FIGURE 17.1<br />

Sinkhole Repair with a Bentonite Cap<br />

PA DEP<br />

Loose material shall be excavated from the sinkhole <strong>and</strong> expose solution void(s) if possible.<br />

Enlarge sinkhole if necessary to allow for installation of filter materials. Occupational Safety<br />

<strong>and</strong> Health Administration (OSHA) regulations must be followed at all times during excavation.<br />

Stones used for the “bridge” <strong>and</strong> filters shall have a moderately hard rock strength <strong>and</strong> be<br />

resistant to abrasion <strong>and</strong> degradation. Shale <strong>and</strong> similar soft <strong>and</strong>/or non-durable rock are not<br />

acceptable.<br />

363-2134-008 / March 31, 2012 / Page 328

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