Laserfiche WebLink
<br />Nc+w Horizon Mine: 2007 Vegetation Samptirtg for Phase 3 8ortd Release <br />Table 2 shows the values for the t-test. Because tG is greater than ta, the nail hypothesis is <br />rejected, reclaimed area production is deemed to exceed Ct, and revegetatian is deemed <br />successful in 2007 for production. <br />Table 2. Statistical values fvr the 2-sample reverse-null t-test, Phase 3 Irrigated Pa~-ture reclaimed area <br />production vs. the reference area standard. <br /> irrigated Pasture Phase <br />3 Reclaimed Area trrigated Pasture <br />Re#erence Area <br />Mean Production, Ibslacre X 3,712.6 2,512.5 <br />Standard Deviations 1,124.3 1,726.3 <br />No. of S lee n 39 44 <br />Sam le Ade ua Demonslrater3 Yes No <br />Standard Error SE = s/~1n 2131.33 260.25 <br />SE Satterthwaite 3fl9.26 <br />De Tees of Freedom d_ Satterthwafte 73 <br />Calculated t value ~ 3705.3()4 <br />t, {table t-value) (1-tailed, P=0.14, df <br />Satterthwaite ~~ <br />1.293 <br />4.0 RESULTS: DRYLANt7 PASTURE <br />4.1 Drviand Pasture Reference Area <br />Measurements of cover (live vegetation including annual plants) for each transed and summary <br />statistics are shown in Table A4. We completed 21 cover transec#s, and sample adequacy was <br />demonstrated. Production data and summary statistics are sown in Table A10. We sampled 49 <br />pto#s without reaching sample adequacy, due to the uneven production in the reference area. <br />4.2 Drviand Pasture Phase 3 Band Release Area <br />Measurements of cover (live vegetation including annual plants) for each transect and summary <br />statistics are shown in Table A6. We ~mpfefed 23 cower transacts, and sample adequacy was <br />demonstrated when annual plants are included. Mean cover of live vegetation was 28.4%. <br />However, CDRMS regulations alines cover of annual vegetation to count towards demonstration <br />of bond release up to t0% of total cover, and beyond that to a maximum equal to the amount of <br />annual plant cover in the reference area. Amounts of live annual plant caner in the study areas <br />were as follows: <br />Dryland Pasture ReGaimed Area: Annual Grass i.0% <br />Annual Forb 15,3% <br />Total 16.3°h <br />Dryland Pasture Reference Area: Annual Grass 0.2°!0 <br />Annual Forb 14.1 <br />Total 14.3°l0 <br />8ia-Logic Environmental <br />November 12, 2007 <br />Attachment 1-9 <br />