_INSPECTION - C1980005 (9) - Laserfiche WebLink

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3 u III. COMMENTS-COMPLIANCE Below are comments on the inspection. The comments include discussion of observations made during the inspection. Comments also describe any enforcement actions taken during the inspection and the facts or evidence supporting the enforcement action. condition of liner material, and apparent channel functioning and stability were noted and compared to permit specifications. Observations were also made regarding the apparent stability of hillslope locations throughout the area, including the site of the small slump located to the east of PM-8, which had been noted and repaired in 2008, and the various locations where gullies or areas of concentrated rill erosion had been graded, roughened and seeded. Attachment 1 to this inspection report is a spreadsheet listing of site locations where measurements and/or digital photographs were taken, along with pertinent data and comments. The attachment addresses each of the three areas inspected during the SL-4 inspection(East Wadge Area, Solid Waste Disposal Site, and Channel PM-12A). Pertinent photos are included in Attachment 2 to this report. In general, the drainage improvements made within the East Wadge Area since 2007 appear to have been quite effective. A few widely scattered rills up to 10" deep were noted between the 2- track route and V-Ditch#1, and in a few locations on the slopes between V-Ditches. These scattered rills all appeared to be healing; hand maintenance such as small rock checks or staked straw wattles in some locations would likely accelerate recovery. The rills should be monitored under the operator's approved rill and gully plan to ensure continued recovery. No equipment work is recommended for these isolated hillslope rills. The 2008 slump repair area appeared stable, with no new cracks or other indications of movement apparent(Photo #460). No additional slumps or areas of cracks or other indicators of potential mass instability were observed in the East Wadge Area. Regraded/roughened/seeded areas which had been eroded prior to TR-41 drainage improvements appear to be erosionally stable, although vegetation is still at an early successional stage in these areas (Photo# 464). The V-Ditches were in general constructed in accordance with approved designs, although vegetation along the channels is not yet well established, and shallow scour was observed in some locations. Typical V-Ditch segments are depicted in Photo#450 and 462. The operator will need to monitor the condition of the V-Ditch channels to ensure that adequate vegetation does become established, and that channel rills do not worsen. The V-Ditches are generally over-sized, and hand installation of small rock checks, straw wattles, or similar structures in series could be employed without compromising ditch capacity. Such structures may be useful to minimize scour until a stabilizing vegetative cover becomes established. One problem location was observed with respect to V-Ditch construction and functioning, which will need to be repaired prior to Phase 1 bond release approval. The lower-most segment of V-3 (approximately 30 feet in length extending up from the junction with PM-8) was steeper than 5