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°min = <br />(t)2 (s)2 <br />(d Xbar)2 <br />where: n~ =minimum sample size <br />s =sample standard deviation <br />t =the Student's t distribution value at the 90% level <br />d =percent acceptable deviation from the mean (] 0%) <br />X~ =sample mean <br />III. RESULTS <br />C~ <br />The new greasewood reference azea (NGWRA) encompasses approximately 2.4 acres <br />northwest of the Cameo Refuse Disposal Area No. 1 situated on aneast-facing colluvial <br />toeslope and fan. The NGWRA is bisec;ted by the channel of the ephemeral drainage <br />through the area. The east boundary is the BLM Book Cliffs access road and the west <br />boundary is the break in slope where a :noticeable change in vegetation occurs. UTM <br />coordinates of the center of the NGWRA are 106,050 feet E and 1,019,500 feet N. The <br />observed slope ranges from less than one degree to ten degrees, with the majority of the . <br />azea on slopes approximating two degrees in slope. Aspect was predominantly east. Soils <br />were generally silty in texture, with rock ii•agments increasing with an increase in upslope <br />position. <br />Four lifeforms were encountered during the sampling of the NGWRA. They included <br />graminoids, forbs, succulents, and shrubs. Fifteen individual plant species were <br />encountered during cover sampling. Of the species encountered, eleven were perennial <br />and four were annual. The six graminoid species were evenly distributed between cool <br />and warm season species. Both forb species encountered were identified as cool season. <br />Shrubs were all deciduous in habit and 'the succulent was evergreen Six species were <br />graminoids, two were forbs, one was succulent, and six were deciduous shrubs and low <br />shrubs. Twelve species were native in origin and three were introduced. The plant species <br />encountered and their characteristics are presented in Table 1. <br />Vegetation Cover <br />Total vegetation cover of the NGWRA was 49.07 percent. Based on cover sampling, <br />graminoids represented 35.47 percent mean cover (67.61% relative cover), forbs <br />accounted for 0.93 percent mean cover (1.42% relative cover), the succulent provided <br />0.13 percent mean cover (0.20% relative cover), and woody plants represented 12.53 <br />percent mean cover and 30.77 percent relative cover. <br />• <br />-4- <br />