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SECTION 4:TREE MONITORING RESULTS <br /> The averageg health and vigor score in this planting sub area in Year 5 (2011) is 1.7.The Year <br /> 5 (2011) score of 1.7 corresponds to a little more than halfway between"low" and"medium" <br /> ranks.The score of 1.7 is slightly higher than the Year 4 (2010) score of 1.6,but Area D ' <br /> continues to have the lowest health and vigor score recorded of any of the planting sub <br /> areas (Table 4-2). <br /> Year 6 (2012) <br /> In Year 6 (2012),the rate of tree survivorship in Area D was 78 percent,the lowest of all six <br /> planting sub areas.This rate is slightly higher than the Year 5 (2011) plant survivorship ' <br /> (76 percent)but is still below the 80 percent survivorship objective. Area D is the only <br /> planting sub area in Year 6 (2012) that failed to achieve this goal.The lower survivorship <br /> rate in this sub area compared with tree survivorship elsewhere onsite is likely a result of <br /> very poor soil texture,low fertility,and surface disturbance. As described in Section 5,the <br /> final survivorship criterion of 80 percent is calculated on a site basis (and includes all six <br /> planting sub areas). In all six monitoring years (Years 1 through 6), the survivorship rate for ' <br /> the entire site exceeded the 80 percent success criterion by a wide margin (Table 4-2). <br /> In Year 6 (2012),11 trees were recorded as dead in Area D (or 22 percent of the 50 trees ' <br /> planted) (Appendix A).Similar to previous monitoring years,black willows had the highest <br /> mortality rate (5 trees recorded as dead) in this planting area. One black willow that was <br /> recorded as dead in Year 5 (2011) showed some new growth and was counted as"live" in ' <br /> Year 6 (2012).Three box elder, two valley oak,and one Fremont cottonwood were noted as <br /> dead in Year 6 (2012) (Appendix A).Trees planted in this sub area may re-sprout from the <br /> root-stock or show new growth,and this will be re-examined during future site visits and <br /> system checks <br /> The average health and vigor score in Area D in Year 6 (2012) is 1.8,which corresponds to a <br /> little more than halfway between"low" and"medium' ranks. The score of 1.8 is slightly <br /> higher than the Year 5 (2011) score of 1.7 but Area D continues to have the lowest health and <br /> vigor score of any of the planting sub areas (Table 4-2). <br /> 414 ' <br />