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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />correction of adverse conditions through engineered <br />design and construction may be an acceptable mitiga- <br />tion technique if the methods are supported by care- <br />ful investigation and evaluation, by a qualified <br />professional engineer or geologist, of the physical <br />extent, seriousness, and causes of geologic problems. <br />Those methods may involve, among others: refraining <br />from removing natural support material in the area <br />immediately beneath or adjacent to the slide area; <br />addition of artificial support to the area in the form <br />of rock or earthfill buttressing, retaining walls or <br />cribbing, concrete slurry, rock bolting and reinforced <br />pilings; permanent improvement and control of surface <br />and subsurface drainage; and stabilization of the slide <br />area by chemical treatment, bridging weak zones, re- <br />moval of unstable material, and avoidance of loading <br />on unstable areas. <br /> <br />(c) Rockfall areas <br /> <br />Decrease of rockfall hazard to an acceptable level may <br />be an acceptable mitigation technique if supported by <br />qualified technical evidence. Methods may involve, <br />among others: <br /> <br />(I) Stabilization of rocks by bolting, gunite appli- <br />cation (cementing), outright removal of unstable <br />rocks (scaling), cribbing, or installation of <br />retaining walls; <br /> <br />(II) Slowing or diverting the moving rocks by rock <br />fences, screening, channeling and dams, or by <br />concrete barriers or covered galleries; or <br /> <br />(III) Installation of physical barriers against rock <br />impact around vulnerable structures. <br /> <br />(d) Mudflow areas <br /> <br />I <br /> <br />Correction of adverse conditions through engineered <br />design and construction may be an acceptable mitigation <br />technique if supported by proper technical evidence. <br />This may include channelization, diversion dikes, <br />debris catchment basins, special foundation, and other <br />means. <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />(e) Unstable or potentially unstable slopes <br /> <br />Engineered design and construction can be used in areas <br />where instability is moderate and is amendable to re- <br />medial engineering. Applicable techniques are contained <br />in ]-205(1) (b) Ii) of these regulations. <br /> <br />-8- <br />