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~, F~ ~~~~uiu~~~ilVllll ~ 999 y . S av~ eu-c.v~- ~- ~ s•5 oG' .....s Y ~tiv~se~~- MEMO •WESTERN T0: Mr. Mike Savage RESOURCE Reclamation Specialist DEVELOPMENT CORP. Colorado Mined land Reclamation P.O Box 467 FROM: Dav i d L. Johnson 71t Walnul Slreel ~~~w-a Boulder, Colorado 80306 Western Resource Development 130:f) 44&9009 SUBJECT: Vegetation Program for the proposed • Mack 3 Loadout, Mesa County, Colorado SUMMARY: DATE: August 15, le:" nu c~ 1 S 1983 trfINFD L~YD IIF.CIF'd?.tlntl O;IISION Cola. Ucpl. of P!atural fesoarces As discussed by telephone on July 15, 1983, Sheridan Enterprises plans to develop a rail loadout on a 7-acre site just east of Mack along U.S. 50. The site was disturbed when the railroad was developed. Dir} excavated for the below grade railroad bed has been scattered parallel to the railroad. Much of the mounded soil has now been revegetated. Various Atrlplex shrubs and a few perennial grasses along with numerous weedy species and, of course, cheat grass dominate the site. ~~ Experimental Design The entire 7 acres wilt be sampled as one community type. A reference area wt,ll not be established as premining inventory data will be used to develop reclamation standards. Quantitative data will be collected at sample points randomly selected. Random sample selection will be accomplished using a grid overlying the project site. Grid cells will be 30 m by 30 m. Using pairs of random numbers and Cartesian coordinates, fifty sample points (maximum number requlredl will be selected. Cover, pru ductlon, and woody plant density sampling will occur at the same randomly located point. Sample adequacy For cover, production, and density will be calculated per the foliowing formula: _ T=s~ nmin IdRIT where nmin = minimum sample size t = t value for 2-Called test It = 1.282 for 80~ confidence) s = smple standard deviation d = detectable change in the mean z = sample mean -1-