Laserfiche WebLink
• • III IIIIIIIIIIIII III <br />United States Soil P. 0. Box 773389 <br />Department Conservation Steamboat Springs <br />o f A car i c u I t u r e__..____ _._.__...,__._.__S e r v i _c e_,___.._____._____ __..__...._.__C o_I. o r a.d o .~_ 80477 <br />February 20, 1991 <br />Markus Middleton <br />Cyprus Yampa Valley Coai Corp. <br />29587 RCR A+27 <br />Oak Creek, Co. 80467 <br />Dear Mr.Middleton: <br />RE: Review of USLE Calculations as requested; Technical Revision <br />90-06, Permit C-84-062. <br />Per your request to have the USDA Soil Conservation Service review <br />your USLE calculations and address questions presented by David Berry <br />of the CMLRD. <br />5b. Is K factor of .32 correct? <br />The K factor for the soils are based on an undisturbed soil. <br />If major disturbances take place the K factor could increase <br />several times. The published K factor for the soil Splitro <br />should be .20 for both top soil and subsoil. The K factor <br />for the Buckskin soil is .32 for topsoil and .37 for <br />subsoil. This discrepancy effects the USLE in all the <br />following answers. <br />Sa. Has the USLE calculations been properly applied? <br />If K factor of .32 is correct then the answer is yes. <br />The K factor should be .20 for Splitro or .37 for Buckskin <br />the soil. <br />DEMONSTRATION AREA 2. LS factor for 400' X 20% slope, <br />should be 8.0 not 3.0. However, the final answer is <br />correct. <br />DEMONSTRATION AREA 3. LS factor should be 3.5 not 3.0. <br />However the answer is correct. <br />