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<br /> <br />REVIEW QUESTION <br />2.06.8 Surface Coal Mining and Reclamation Operations on <br />reas, or A ~acent to reas nc u ing A uvia <br />a ey oors <br />The alluvial valley floor discussion presented in the application is inade- <br />quate. Valleys of particular concern with respect to the mine are Hayden <br />Gulch, Dowden Gulch, Williams Fork at and downstream of the confluence of <br />Hayden and Dowden Gulch, and Dry Creek. Another area of great concern is <br />the Yampa River Valley as impacted by the loadout facility. The.appli- <br />cation mentions the presence of agricultural activity in this area. <br />A reconnaissance level alluvial valley floor study is required from the op- <br />erator.. This study should comply with Section 4.25 of the regulations and <br />should include a map of the total life of mine area (on a llSGS 7-I /2 minute <br />topographic sheet base) showing alluvium in these streams including valley <br />bottoms and floodplain terraces. Identification of areas of existing or <br />historic flood irrigation practice, riparian vegetation which indicates <br />subirrigation, and a discussion of regular flood irrigation practice in <br />areas of, similar or smaller drainage size for considering any potential <br />subirrigation must be provided. <br />RESPONSE <br />' See attached copy of proposal to conduct the Alluvial Valley <br />Floor reconnaissance study. <br /> <br />