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-3- <br />S. To assure river restoration, you shall monitor for river bank stability and sediment <br />transport for a period of three (3) years. This period shall commence upon completion of <br />the temporary and permanent construction activities and the post-construction report. <br />The first monitoring report will be due in December 2012, with subsequent reports due in <br />December 2013 and December 2014. You shall submit monitoring reports to the Corps <br />annually for three (3) years as described above. The major components of the <br />monitoring include surveys of the bank stability and sediment transport and visual and <br />photo documentation of structures and excavation areas. Surveys are required annually <br />for a period of three (3) years and are described below; <br />BANK STABILITY SURVEYS <br />Two types of surveys shall be required, annually for a period of three (3) years, and are <br />conducted to determine the impacts of high flow conditions on bank stability. Elevation <br />surveys will be conducted at the selected locations identified on the enclosed Sheet 1- <br />Work Area Cross Sections of the Colorado River (i.e., upstream, within, and downstream <br />of the restored river reach). Data from these surveys will be used to construct cross <br />sections and a linear profile of the river channel. <br />The second type of bank stabilization survey shall be a visual and photo - documentation <br />survey of the stream banks to evaluate the effects of high water on the stability of the <br />restored river channel. Any displaced rocks used for bank stability or in- stream <br />structures will be noted and repaired on an annual basis following Special Condition <br />number 7 above. The visual and photo - documentation survey will also note the health of <br />the transplanted riparian vegetation. Dead vegetation will be replaced with healthy <br />plants, again per maintenance Special Condition number 7. <br />SEDIMENT TRANSPORT SURVEYS <br />In the Chambers Pit reach of the river, six cross sections are located across the main <br />channel and will be monitored to determine the amount of sediment deposited in the <br />channel after spring runoff. If the channel doesn't meet design dimensions, material will <br />be removed from the channel in a manner consistent with Special Condition number 7 <br />above. <br />9. You shall revegetate the bankful bench and riprap areas with willow live stakes in <br />accordance with the submitted plans and the enclosed Vegetation Rip -rap guidance. For <br />the duration of the monitoring period, you will replace dead vegetation yearly in order to <br />maintain a desired and final willow density of a live plant every 6 feet. <br />10. You must sign the enclosed Compliance Certification and return it to this office within 30 <br />days after completion of the authorized work. <br />This verification is valid for one year from the date of this letter or until the NWP is modified, <br />reissued, or revoked, whichever comes first. Failure to comply with the General Conditions of this <br />NWP, or the project - specific Special Conditions of this authorization, may result in the suspension <br />or revocation of your authorization. <br />