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-iii iiiiiiiiiiiiiiii <br />Fc~o}t'k'~R90 DEPARTMtiv i ur 9vH I vnn~ r+ESOURCES <br />U MOnle Paieoe ExeCWrve pueclDr <br />:~tlfo,r ° MINED LAND RECLAMATION DI <br />•~ • DAVID C. SHELTON, Director <br />r 1876 s <br />Pocharo D Lamm <br />Governor <br />DATE: June 14, 1983 <br />TU: Bob Liddle <br />FRUid: Sandy Emrich <br />Rf: Colorado Westmoreland Ines Waste Disposal Area Topsoil Salvage Plan <br />C.W.P. conducted a soil analysis for the top 24" of soil in the proposed <br />waste rock site. They are proposing to salvaye the top 8" to 9". They <br />say that the soils from the "B" horizon (from 9" to bedrock) are <br />unsuitable for topsoil material due to a lack of oryanic matter and a <br />greater number of stones. <br />The organic matter is not a prohibitive factor for topsoil salvage, the <br />percentages are acceptable. Based on the percent organic matter 24" of <br />soil should be salvaged. <br />, Stones may present a problem. C.W.P. should do a sieve analysis to <br />determine the percent coarse fragments ( 2mm). Ns a very general rule, <br />if the coarse fragments are greater than 40% (by weight) the soil may be <br />considered unsuitable. This is a site specific analysis that depends on <br />baseline conditions to detennine the unsuitable limit. <br />In conclusion, I would recommend that 24 inches of topsoil be salvaged, <br />unless C.W.P. demonstrates using a sieve analysis that the coarse <br />fragment percent is too high. <br />I also looked at the Overburden Analysis Report dated t4ay 6, 1983. The <br />pH is 9.5 and is above suspect levels. Also a pH of 9.5 makes it <br />unsuitable as a plant growth medium. The S.A.R. (25.0) does not <br />correlate with the CaC03%(14.6). <br />/ep <br />Doc. No. 3487 <br />" 4 <br />423 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (303) 866-3567 <br /> <br />,.,, <br /> <br />