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Tree basal area averaged 219 ant (.29 sq. Et.) throughout all the stands sailed. The largest tree sar~led had a basal area of 2884 ant (dbh = • 60.6 a~ . The age-size regression mxiel for aspen would predict an age of 184 years for this large aspen. The largest tree coned was lI6 years and average age of aspen fell in the range of 31-75 years. Average height of the shrub stratum in aspen was 143.6 an. The largest shrubs +~ese Gambel oak and chokecherry, 372.9 and 287.0 an, respectively. Shrub height has greater in aspen for individual species than in the two major vegetation types on the study area, reflecting the increased moisture regime in aspen. Average age of the shrub stratum was also the highest within aspen stands on the study area. Aspen areas on Seneca II were wnsidered a subtype within the mixed brush vegetation type. All aspen areas sailed supported an understory vegetation identical to that of the mixed brush vegetation type, thus the aspen subtype did not require a specific reference area: The reference area for the mixed brush type/aspen subtype vegetation type, of which the aspen subtype is a part, was systematically sample3 and • these results are presented in the paragraphs that follow. The mixed brush type/aspen subtype reference area comprises approximately 9.7 acres and is located in an area not proposed for development just off the southwestern edge of the study site (Map 1, Appendix A). 1Wentybne species were encountered >n cover quadrats and the site had a diversity index of 2.26. Total vegetation basal Dover on the site was 12.8$. The grass stratum exhibited the highest percent basal rover with 6.98 as oppose3 to 3.0 and 3.4~ basal saver for the forb aryl shrub strata, respectively. Com[un herbaceous understory species included slender wheatgrass (1.7~ cover and 52~ frequency) and oommn yarrocr (1.28 weer and 98~ frequency). Snowberry was the gust wmronly enwuntered shrub on the control site (688 frequency) and had the highest basal rover of any shrub althouch both servioeberry and Gambel oak evidenced higher canopy cover (14.9 and 12.38, respectively). lJ - 349d - (Rev. 5/86)