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4 <br />reverse siphon located within the survey area. Information on the <br />• date of construction of this ditch could not be found in the reca-ds <br />at the Boulder County Courthouse. <br />A small irrigation ditch running through the survey area, they <br />Clough and True ditch, takes water from the South Branch supply ditch. <br />A portion of this ditch will reportedly be re-routed as a result of the <br />proposed gravel quarrying activities. The date of original approFriation <br />of water by means of the Clough and True is April 15, 1862 (cf. Appendix 11. <br />It was approved and entered on record on June 2, 1882. No other information <br />on this ditch could be found in the records of the Boulder County Court- <br />house. <br />The locations of the ditches described above are shown in Figure 2. <br />Recommendations <br />It is recommended that no known aboriginal cultural remains will be <br />affected by the proposed action nor is it likely that subsurface <br />aboriginal cultural remains will be encountered. Neither the Sout:~ <br />Branch supply ditch or the Oligarchy ditch will be affected by the <br />gravel quarrying operations. It is also recommended that the Clow7h <br />and True ditch is not sufficiently unique, either historically or <br />technologically, to warrant eligibility for nomination to the <br />National Register of Historic Places. <br />• <br />