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<br />Memo to Tony Waldron <br />Bowie No. 2 Geotechnical Adequacy <br />page 10 <br /> <br />should be initiated prior to the initial undermining of the stock pond. Subsequent to the <br />commencement of undermining the ponds should be frequently monitored for an <br />appropriate period of time to verify the culmination of potentially detrimental subsidence. <br />Following any repairs the pond should be frequently inspected until it is apparent that <br />additional damage will not occur. <br />MASS MOVEMENT FEATURES -LANDSLIDES <br />In order to verify the projected negative impact of subsidence upon landslides within the <br />permit area, it would be appropriate to visually inspect known historic and modern <br />landslides. Inspections should occur during the periods immediately following retreat <br />extraction in the immediate proximity of mapped historic and modern landslides. The <br />applicant should propose a detailed inspection methodology to detect subsidence cracking <br />ur rejuvenation of movement to the potentially effected landslides. This should include <br />inspection immediately following the annual ground water high stand of late June, during <br />which the majority of landslide movement normally occurs. These inspections should be <br />conducted annually in areas undermined for an appropriate period of time following retreat <br />extraction, to verify negative impact from subsidence. <br />