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-17- <br />Mr. Richard Atkinson <br />• May 14, 1981 <br />Page Three <br />x <br />Reviewing the reference "Agrialturcl Handbook No. 537" USDA, 1978, <br />recommended in The Adequacy Review, v+e concur that this reference is better <br />for selection of the C factor as additional factors such as land slope ar~d slope <br />length limits are conssdered. From the tables 9 cnd 10 of this reference v+e <br />then selected these values of CS: <br />Condition CS <br />Area being reclaimed <br />Straw mu c , T/acre, on slopes 26:~ to 33?6 0>17 <br />Undisturbed and fully restcred crEa <br />No eppreciab e ~nopy, gress, 80?S ground cover 0.013 <br />Averoce condition in area being reclaimed <br />Averege between stcvr mulched crew cnd fully <br />restcred area equcl to 5~ o (0.17 t 0.013) O.C42 <br />• Next th,e mining and rEClcrction operctions were reviewed cnd the prcr:~ lions <br />of'the erecs under rec cmction cnd undisturbed or-fully reclaimed were estimatEd <br />for Streeter Gulch and Guiui A. (Taylor Gulch vrJS not estimated cs mining prc- <br />a; ession through .this crc~ is scheduled for after the yea r 2000, and therefore not of <br />,. <br />immediate concern.) The rE5"Jlti are as listed: <br />Area (acres) °,5 <br />Areas. Disturbed . Un~isturbed Disturbed Undisturbed <br />and and under or and under cr <br />Years reclamation(1) fully reclaimed reclamation fully reclaimed <br />Streeter Gulch (1367a) <br />1981-1986 139 1228 10.2 89.8 <br />.1986-1991 181 1186 13.2 85.8 <br />1991-1996 112 1255 8.2 91.8 <br />1996-1999 41 1326 3.0 97.0 <br />Av = 8.6 Av = 91.4 <br />Gulch A (667a) <br />1981-1986 l4 653 ; 2.1 97,9 <br />1956-1991 76 591 11.4 88.6 <br />]99]-1996 I67 500 25.0 75.0 <br />1996-1999 155 512 23.2 76.8 <br />. Av = 15.4 A.v = 84,6 <br />(i) Assuming 5 years from first disivrbance cf an area , <br />until area fully reclaimed <br />