ARCHIVED REPORTS_2010 YEAR 4 PHYTOREMEDIATION TREE MONITORING REPORT

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L SECTION 4:YEAR 4 TREE MONITORING RESULTS I `. Year 1 (2007) One Fremont cottonwood died in this planting area in 2007.The survivorship rate for this " sub area totaled 96 percent,the second highest of all the planting areas during Year 1 (2008) monitoring. The average health and vigor score in 2007 was 2.2, slightly greater than a "medium" rank. Year 2 (2008) Results of Year 2(2008) monitoring were almost equivalent to results from Year 1 (2007). L The Fremont cottonwood that died in this planting area during 2007 was not replanted,and this tree was also included in the mortality counts for 2008. The survivorship rate for this L sub area was the same as that observed in 2007(96 percent). The total health and vigor scores in 2008 (51)were very similar to those calculated for 2007(50). The average health and vigor score for 2008 was 2.2,the same average score as calculated in 2007. However,the health and vigor score values for Fremont cottonwood increased slightly and willow decreased slightly compared to the previous monitoring year. Year 3 (2009) One Fremont cottonwood within this planting area was recorded as dead during Year 3 (2009) monitoring(Appendix A). This tree died in 2007 and was not replanted.Therefore,it has been included in tree mortality counts in all three monitoring years. No additional trees b" (out of a total of 23 planted) died in Year 3 (2009)within this planting area.The Year 3 survivorship rate within this planting area is 96 percent. This is the same survivorship value Lrecorded in previous monitoring years (Table 4-1). The average health and vigor score for 2009 in this planting area was 2.4,slightly higher than the score calculated for Years 1 and 2 (2.2 in both years) (Table 4-2). Year 4 (2010) This planting area was one of two planting areas with 100 percent survivorship in Year 4 L (2010) (Appendix A). One Fremont cottonwood was recorded as dead in Year 3 (2009) (Appendix A). In Year 4 (2010), growth was noted stump-sprouting near the base of this Lcottonwood,and this new growth was counted as a live tree in Year 4 (2010) (Appendix A). The average health and vigor score recorded in 2010 was 2.4 (Appendix A), the same value calculated in 2009 (Table 4-2). This score is roughly in between a "medium' and"high" rank. Fremont cottonwood in this planting area had lower health and vigor scores (2.2) than the black willows (2.6) (Appendix A).Lower health and vigor scores for the cottonwoods in this planting area are mainly due to"leaf scorch" (leaf margins that appeared"burned"). L This could be caused by high boron,salinity or plant pathogens;however,the cause is uncertain. L 4.4 Area B Planting Area B is composed of lower and middle planting zones (Figures 1-3 and 1-4). A total of 49 trees were installed in this area. Three tree species (box elder,Fremont cottonwood,and black willow)were planted according to these zones. i L LSAC1166749/103500001(YEAR4.2010_HOLTTREE MONITORING_REPORT-FINAL.DOCX) 4-5