Laserfiche WebLink
Mr. Miguel Hamarat <br />March 9, 2012 <br />Page 2 <br />full operation in 2010 when the lower canal became inundated by the TSF. An as -built <br />survey was conducted in September 2010 and Wheeler personnel performed a site walk - <br />through in September 2011 to document changes that have been implemented following the <br />2007 phase of construction. The current configuration of the canal system is shown on <br />Drawing UC -1 -01 Rev4, which is a revised version of the original record drawing. <br />The following list summarizes the improvements that have been incorporated into the canal <br />system after preparation of the 2007 closeout report. <br />• Several riprap -lined rundowns were constructed on the cut slopes on the uphill side <br />of the canal to mitigate back erosion caused by overland inflows, primarily occurring <br />during the snow melt and early summer season. <br />• A gabion retaining wall was installed on the left side of the access road, above the <br />canal where the canal is inside a culvert, from about Station 37 +30 to 38 +20. The <br />gabion wall ranges from about four to seven feet tall and was installed to mitigate <br />sloughing on the cut slope below a Tri -State powerpole. The powerpole was in -place <br />at the time of the canal construction. <br />• A rock - filled toe drain was installed along the toe of a large fill section on the right <br />outer bank of the canal from Station 68 +00 to 74 +00. The intent of this toe drain is to <br />facilitate proper drainage of the embankment fill material. <br />• A six - inch - diameter corrugated HDPE (CHDPE) drain pipe was installed beneath the <br />canal at Station 74 +00 to collect seepage from the canal invert and convey it in a <br />controlled manner to the right outer bank. The intent of this configuration is to <br />mitigate oversaturation of the outer bank fill material caused by leakage from the <br />canal. <br />• 60- inch - diameter CHDPE pipe was installed from Station 88 +40 to 92 +05 to lengthen <br />the existing canal culvert and to mitigate concerns about sloughing from the steep <br />cut slope above the left inner ban k. <br />• 60- inch - diameter CHDPE pipe was installed from Station 95 +46 to 95 +79 to provide <br />vehicular access across the canal. <br />