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observations reported in the April 10, 2002 inspection report. Please address each of <br />the identified discrepancies, and provide either documentation of the adequacy of <br />the existing installation or a schedule for completion of any necessary field <br />modification. Please in addition document compliance of any segments not <br />specifically addressed in the inspection report. - <br />• Segment 1-Design indicates check dams spaced at 30' intervals. Inspection report <br />indicated one non-riprap section of ditch, apparently within Segment 1, in <br />which rock check spacing was at least 200 feet. <br />Segment 2 and 3 design specifies 6" D-50 riprap along entire length of each <br />segment. Inspection report indicates that, in some sections of these segments, rock <br />checks at various spacings were used in lieu of riprap. 12iprap sections appeazed <br />to be 6" D-50 angulaz rock. <br />Segment 4 and 5 design specifies, respectively, 40' and 50' check dam spacing. <br />Inspection report indicated approximate check spacing of 45' for these segments. <br />• Segment 6 design specification is one rock check every 175 feet. Inspection report <br />indicates rock checks spaced at 66' to 75' intervals. <br />No velocity controls were specified for Segment 7. <br />• 31 foot check-dam spacing was specified for Segment 8. Inspection indicated <br />check spacing ranging from 45' to 90' within the segment. <br />No velocity controls were specified for Segment 9. <br />6" D-50 riprap was specified for Segments 10 and 11 and confumed by the <br />inspection. <br />90' check spacing was specified for Segment 12. Inspection documented 6 rock <br />checks with spacing between 60' and 90'. <br />d) Subsequent pages provide SEDCAD channel designs for the various segments. <br />Following is a segment specific comparison of permit specified channel dimensions <br />versus observations reported in the April 10, 2002 inspection report. The permit design <br />specifies a triangulaz ("V") shape for all channel segments. Please address each of the <br />identified discrepancies, and provide either documentation of the adequacy of the <br />existing installation or a schedule for completion of any necessary field <br />modification. Please in addition, document compliance of any segments not <br />specifically addressed in the inspection report. <br />Deserado Mine Apri130, 2002 <br />12 <br />