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• Several locations were observed along the landside of the levee where groundwater was <br /> seeping through the in-situ soil material. It is highly likely that the source of the groundwater <br /> is from the Dry Creek ditch, which is located near the streamside toe of the levee. The <br /> groundwater seeps appear to be well below the level of the compacted fill material, and is <br /> actually seeping through the undisturbed soils below the base of the levee. This seepage <br /> situation as it exists today does not appear to pose a threat to the structural integrity of the <br /> levee. It is recommended that a piping analysis be performed at two locations along the levee <br /> by a licensed geotechnical consultant. The locations should be selected near the seepage areas <br /> or where the levee geometry would be the most susceptible to piping problems. <br /> • Acceptable interior drainage is provided on the landside of the levee. <br /> • There are no closure structures, slide gates, or other features that would require human <br /> intervention during an actual flood emergency. The levee can fully function as a flood <br /> control measure as it exists today. Providing that the levee meets FEMA's levee criteria <br /> (compaction, stability, freeboard, etc.), then the CWCB feels comfortable that the levee <br /> provides adequate 100-year flood protection for land areas on the northwest side of the levee. <br /> cc: Division of Minerals and Geology <br /> C:\seca\projects\boulder\cu-flatiron tripl.doc <br /> 2 <br />