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Gary Isaac <br />CAM-Colorado, LLC <br />August 29, 2008 <br />Page 18 <br />hydrology designs or make changes to the Sedcad designs to reflect the soils on <br />Map 04. <br />E. On page H-3 of the hydrology design for pond H, the curve number determination <br />for the salt desert shrub resulted in a number of 86. However, as shown on page <br />H-4, a curve number of 88 for salt desert shrub was used in the pond H runoff <br />determination. Please correct this discrepancy. <br />F. On page H-3 of the curve number determination for pond H, a soil type of . <br />Persayo Sandy Loam is used for the salt desert shrub community. Referring to <br />Map-04, however, there does not appear to be any such soil type in the drainage <br />area for pond H. Map-04 does show that Chipeta Clay is in the pond H drainage <br />area, but this soil type is not used in any of the curve number determinations. <br />Please explain the use of these soil types in the hydrology designs or make <br />changes to the Sedcad designs to reflect the soils on Map 04. <br />G. On page B-4 of the curve number determinations for pond B, a soil type of <br />Persayo Sandy Loam is used for the salt desert shrub community and Avalon <br />Sandy Loam is used for the Juniper Shrub community. However, these two soil <br />types are not shown on Map-04 being within the drainage area for pond B. <br />Conversely, Map -04 shows that Chipeta Silty Clay is in the pond B drainage area <br />but this soil type is not used in any of the pond B curve number determinations. <br />Please explain the use of these soil types in the hydrology designs or make <br />changes to the Sedcad designs to reflect the soils on Map 04. <br />H. On page D-3 of the curve number determinations for pond D, a soil type of <br />Persayo Sandy Loam is used for the salt desert community. This soil type does <br />not appear on Map-04 for the pond D drainage area. Two other soil types, Chipeta <br />Clay and Aga Very Gravelly Loam do appear in the pond D drainage area shown <br />on Map-04 but are not used in the curve number determinations. Please explain <br />the use of these soil types in the hydrology designs or make changes to the Sedcad <br />designs to reflect the soils on Map 04. <br />45. Referring to Map 15-1, it appears that there are several places where runoff from <br />adjoining slopes could flow freely onto or into certain support facilities in the portal area. <br />One such area is pond A while another is the portal bench. Three other areas are the <br />access road leading up to the water tank, the haul road switchback just above the start of <br />ditch RD-A14, and the northwest side of the material storage area adjacent to that same <br />haul road switchback. The Division requests that CAM consider additional ditches in <br />these areas to keep runoff from adversely affecting pond performance, bench stability and <br />road stability.