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STATE OF COLOIZP~DO <br />Roy Romer, <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Dtr~ctor <br />DATE: July 25, 1989 <br />T0: Carl Mount, Susan Mowry ~ <br />FROM: Tim King ~~ <br />RE: Seneca II Topsoil Depth <br />After sorting out two separate topsoil replacement maps and drilling 186 <br />holes, I have arrived at an average topsoil replacement depth figure of <br />16.46 inches for all years for all area of the Seneca I? Mine. This figure <br />was derived from sampling which took place over two summer seasons; July 1988 <br />and July 1989. <br />The average depth for each year for each area is shown below. <br /> Wadge Pit Wolf Creek Pit Other Area <br /> <br />°-197 <br />- <br />- ~. <br />~ 11.75* <br />~~`/8 14.83 13.33 - <br />1979 18.18 12.50 - <br />1980 19.09 - - <br />1981 16.70 13.25 12.00 <br />X1982 14.90 11_DO* 13.72 <br />1983 12.50 20.57 14.00 <br />1984 15.20 21.50 12.50 <br />YT:485~ ~,11v22*~ 26.72 17.33 <br />1986, 12.60 28.00 16.00 <br />1987•. 16.00 28.00 16.66 <br />1988' 19.00 19.75 '.5.00 <br />* Indicates less than minimum reouired topsoil replacement depth of 12 inches, <br />as specified by the permit application. <br />The vegetation which I noted in most areas is alfalfa, three feet hioh. <br />However, the 1966 through 1988 areas show much slower growth. And in at least <br />one case in a 1988 area, only weeds are present, although mine officials agree <br />that this area had been seeded the previous spring. <br />8343E/sca <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3557 <br />