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0.50 meterz quadrat. Production material was air dried until weights varied by no more than <br />0.lg. <br />2.2.4 Species Composition <br />Species composition information was derived from quantitative vegetation cover data. <br />Relative cover information provided a basis for evaluation of the importance of each <br />encountered plant species and lifeform and for comparison to the final revegetation success <br />criterion. The table presenting data summaries for total vegetation cover also contains the <br />relative cover by species, and a column depicting the numerical ranking of each species by <br />relative cover within the area. <br />2.3 SAMPLE NUMBERS/SAMPLE ADEQUACY <br />For the purposes of vegetation monitoring at the Keenesburg Mine, set numbers of samples <br />were established for the parameters to be sampled by Savage and Savage and Coors Energy <br />Company. The number of samples taken for each parameter was consistent with numbers <br />agreed to in the past by CDRMS. <br />Since the purpose of this sampling was the monitoring of the vegetative condition at the <br />revegetated areas of the mine, sampling need not meet sample adequacy requirements. <br />Minimum sample sizes and standard deviation are reported as an indication of variability of the <br />sampled parameters. Comparisons between sample mean parameter values assume that the <br />sample mean value accurately represents the population mean in all cases. <br />2.4 SPECIES IDENTIFICATION AND VERIFICATION <br />Species identification was accomplished in the field through the use of plant identification keys <br />(Harrington, 1954, Weber, 1990; Whitson, 1987; Zimdahl, 1990, Stubbendieck, et al, 1995). <br />In cases where plant identification was inconclusive in the field, voucher specimens were <br />pressed for lab identification. <br />3.0 RESULTS <br />3.1 QUANTITATIVE EVALUATION: RECLAMATION AREA 30 <br />Reclamation Area 30 encompasses 9.68 acres of reclamation in one parcel within the <br />Keenesburg Mine permit area. Reclamation Area 30 was formerly part of the B Pit mining <br />area and was reclaimed to a gently east-sloping landform blending into the native undisturbed <br />area to the west and the reclaimed mining and operational areas to the east. Final revegetation <br />seeding with the permanent seed mix took place in November 2006. Specific vegetation <br />information for Reclamation Area 30 is contained in Tables 1, 2, and 3. <br />E <br />Coors Energy Company Keenesburg Mine Page 8 <br />2010 Revegetation Monitoring Report