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heic;ht ul .rpproxinr.rtch• t;ll(1 to b511 feel. Cavities may' be ettended brvond 2(NI <br />fret in dianu°ter h, test maximum Efruduilinn iahabifity while maintaintn~; cacih' <br />intrZ;t•it~ . l'hr ravrh' will nut f?e a void Lxcausr ~mlv a portion of lhr vohnn~~ will <br />havr lzren Honed. 'fhe irunlublc oil shale, marlstune, and tuff matrix will remain <br />after sohttion mining. Al the f'iirance Site, the prapusrd nuninl~ ultrrval <br />contains fit? to ~ S percent oil shah arni other residual rock. <br />I~rvtsrd I cbruar~• 2(111-1 <br />