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Mr. William R. Beavers <br />Mr. Pete Evans <br />August 13, 1980 <br />• Page -2- <br />However , felt. M~RJ w.I) rot rt~~[~rorc w new (~rr.n~L vl~til .i ~r •~,.~k, <br />existing operations. 11 1 <br />ll~f •11 }C 11iM I~. ty. ~.,Lhor ,S Ir•i ~Jd [~ I.. 'µC in lip ~i~s:T Or.. <br />Reference areas would be located in two vegetation types, the pinyon-juniper and <br />the mixed shrub type. A reference area in the pinyon-juniper vegetation should be <br />of a size approximately equal to and in the immediate vicinity of the portal fa- <br />cilities location. <br />Collection of species for a species list will be accomplished in the Spring of <br />1981. At this time the presence of threatened, endangered, and noxious weedy <br />species will be noted. Specimens will be verified at the University of Colorado. <br />Cover data will be obtained by randomly placing quadrats of 1/2 R 2 meters in size <br />within each reference area. Within each quadrat, species cover, cover by rack, <br />bare ground, and litter will be noted. Enough data to be statistically accurate <br />with confidence levels at 80Y. will be taken. <br />Productivity of all herbaceous material will be obtained within each reference <br />area. Major species will be separated, while minor species will be combined by <br />lifeform. Tissue collected will be oven dried at 105 degrees centigrade for at <br />least 24 hours and weighed to the nearest .1 of a gram. Productivity of all her- <br />baceous material will be obtained in 1/2 X 2 meter quadrats within the reference <br />areas. Enough data will be obtained to be statistically accurate with confidence <br />levels at 807.. <br />Shrub tree density will be obtained within each of the reference areas by counting <br />the number of individuals of each species in at least 25, 50-meter square plots. <br />Plots will be randomly placed and will have neither duplication nor overlap. <br />"enough data to be statistically accurate with confidence levels at 80Z will be ob <br />tained. <br />Species diversity values will be calculated utlllzing cover data. The Shannon- <br />Wienet index of diversity will be utilized. <br />Data obtained from the mixed shrub and pinyon-juniper reference areas will suffice <br />for the minimal disturbance which occurred in the oakbrush vegetation type. Pro- <br />ductivity of the orchard vegetation type will be assessed by noting the amount of <br />produce produced. <br />If the foregoing correctly states your understanding of the meeting and discus- <br />sions, please indicate by signing in the appropriate block below. Lf not, please <br />amend this document to your understanding and sign in the appropriate block. <br />Please sign all copies and return one copy to CWI Eor our files. <br />Sincerely, <br />Patricia t4. Farnsworth <br />Mine Engineer <br />