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2.8 SAMPLE ADEQUACY <br />e <br /> SamFle adequacies for cover, prcduction, and density were cal- <br /> culated for each vegetation type. The sample adequacy formula is as <br /> follows: <br />' t=sz <br /> nmin _ <br />(dx) <br />' where n = <br />min minimum sample size <br /> t = t value for 2-tailed test at 90~ confidence for herbaceous <br /> vegetation types ft = 1.645) or 80~ confidence for woody <br /> vegetation types It = 1.282) <br /> s = sample standard devia tion fn-1) <br /> d = desired detectable ch ange in the mean (0.1I <br />' x = sample mean <br />' 2.9 TIME OF SAMPLING <br />All sampling was completed during the first two weeks of August 1984. <br />t 2.10 AGENCY COORDINATION <br />' David Johnson, Western Resource Development 1WRD) met.with Mike <br />Savage of CMLR the week of 9 July 1984 to review CMLR's vegetation <br />stipulations for the Trinidad Basin Mine. On 15 July 1984, WRD, per <br />' the consent of Trinidad Basin Mining, submitted a vegetation sample <br />plan designed to address CMLR stipulations. <br /> On 1 August 1984, David Johnson, David Buckner, and Richard Clark <br />' all of WRD again met with Mike Savage. The vegetation sampling program <br /> for the Trinidad Basin Mine was reviewed and discussed. This program <br /> was aproved with one modification. Because extensive portions of the <br /> Pinyon-Juniper N;oodland Complex were previously mined, it was decided <br /> that the remaining unaffected areas of this vegetation type would be <br /> sampled as an extended reference area. This sampling strategy precluded <br /> sampling a corresponding affected area while the extended reference <br />' area would be the reclamation standard. <br /> On 7 August 1984, David Johnson informed Mike Savage that portions <br />t of the Meadow vegetation type were actually seeded, introduced bunch <br /> grasses. It was agreed that these areas would not be included as part <br /> of the Meadow to be sampled. Furthermore, since the remaining portions <br /> of the predominantly native Meadow included many disturbances from <br />' historic mining operations Ie.g., coal spoils, home sitesl, it was <br />1 <br />-4- <br />1 <br />