Laserfiche WebLink
III. COMMENTS -COMPLIANCE <br />Below are comments on the inspection. The comments include discussion of observations made during the <br />inspection. Comments also describe any enforcement actions taken during the inspection and the facts or <br />evidence supporting the enforcement action. <br />Independent of the alternative selected to stabilize the azea; MWH also recommended that <br />surface water run-off and run-on control measures be implemented as soon as possible. These <br />measures should consist of adequately designed and lined surface water diversion channels and <br />down-drains where necessary. In addition, surface slope protection measures such as vegetation <br />or placement of riprap should also be implemented. <br />Adequately designed surface water diversion channels and surface slope protection measures <br />were never installed or implemented. The one down drain that was installed above the slide <br />damaged area was removed and a berm replaced, which duetted surface water back onto the <br />outer edge of the road and on to the safety berm and slide damaged area. This is documented in <br />the DMG's August 2002 inspection report, which states the following. "The road drainage run <br />out that receives the outflow from Culvert D-4 has been bladed and a berm has been built up in <br />front of this run out. Please consider removing the berm at this location. This drainage run out <br />serves an important function in keeping runoff away from the outslope above Pond 012. Keeping <br />surface runoff away from the slide azea below the Haul Road D embankment is a critical <br />component of the mitigation plan for the slide that occurred at this location." <br />SCC did not remove the berm at this location. The berm remained throughout the 2002/2003 <br />winter and 2003 spring runoff. Photographs taken by the DMG during an aerial inspection <br />conducted on Apri127, 2003, showed that the slope appeazed saturated in some locations and <br />new cracks had formed just above the Pond 012 inlet and immediately below the Haul Road D <br />embankment. <br />The site appears to remain unstable and additional cracking and slumping has been noted in <br />several inspection reports subsequent to the initial slide. Additional movement and instability at <br />the site of the slide has been noted on several occasions and documented in the following DMG <br />inspection reports issued: June I5, 2001, Apri130, 2002, Apri101 and Apri128, 2003. <br />During the previous inspection conducted on June 11, 2003, SCC indicated that their slope <br />stability consultant was preparing a report with recommendations for repairing and stabilizing the <br />slide damaged area, and that the report would be available by the end of Tune. During the July <br />inspection, SCC provided the DMG with one page of a letter report from their consultant <br />(Montgomery Watson Hazza), which presented further recommendations to remediate and <br />control the slide. The letter report was dated June 23, 2003. Based on this inspection, none of <br />the additional steps recommended by MWH have been implemented at the site. <br />