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August 23, 2004 <br />Page 3 of 3 Pages <br />In order to characterize lower stream flows during irrigation season, sampling during the 3rd <br />calendar quarter should be done after July 15. The prevailing weather conditions (raining, <br />snowmelt, extended dry period, etc.) should be recorded in the sampling record. <br />We aze assessing the need for sampling on Morgan Gulch just above the Yampa River <br />confluence. <br />Low-flow flumes installed in erodible alluvial materials aze subject to damage. Flumes integral <br />with weirs and crest gages, designed to pass the 100-yeaz, 24-hour storm event, maybe <br />appropriate. An alternative is to staff gage and calibrate flows through existing culverts and <br />under existing bridges. <br />3.3 Geochemistry. <br />The work plan proposes one hole in the initial box-cut azea. This may provide the information <br />for Colowyo to determine feasibility. To meet the State guidelines, however, your proposed total <br />geochemical baseline program (Phases 1, 2, and 3) should have a density of one hole per squaze <br />mile with a minimum of three drill holes. <br />The pazameter of swell should be added to Table 3.5. <br />That portion of the work plan that indicates sampling "should" or "may" be conducted in <br />accordance with State guidelines should be changed to read that the sampling "will" be <br />conducted in accordance with State guidelines. <br />We believe the meeting was most beneficial. As we discussed during the meeting, we look <br />forward to a joint reconnaissance of the azea at the eazliest available time. Please call me if you <br />have any questions. <br />Yours truly, <br />~~ ~ ~d-~` <br />Byron G. Walker <br />Environmental Protection Specialist <br />Cc: Dan Hernandez, Division (e-mail) <br />Kent Gorham, Division (e-mail) <br />Tom Kaldenbach, Division (e-mail) <br />Jane Binns, Division (e-mail) <br />