ARCHIVED REPORTS 2011 YEAR 5 PHYTOREMEDIATION TREE MONITORING REPORT

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SECTION 4:YEAR 5 TREE MONITORING RESULTS , the road. It is possible that these trees could die over the next few years, slightly increasing , the overall tree mortality in this planting sub area. In Year 5 (2011),the average heath and vigor score was 2.0 (Appendix A). A score of 2.0 corresponds to a"medium' rank. This vigor score is slightly lower than scores calculated in previous monitoring years (Table 4-2). The health and vigor score dropped slightly in Year 5 , (2011)because one tree was recorded as dead and the lower branches of a few trees located next to the road were burned in the fire. Most of the vegetation is likely to re-grow next year. However,it is possible that the burned trees could later succumb to insects or , pathogens, and these trees will be re-examined during future system checks or site visits. 4.3 Area AA Area AA is located adjacent to an area of standing water that was caused by and is now maintained by a levee break. Because groundwater conditions are high, only trees ' recommended for the lower planting zone were installed (Fremont cottonwood and black willow). A total of 23 trees were planted in this area. 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). 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 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 (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 recorded 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). 4-6 SACJ4203071113570001(YEAR5-2011 HOLTTREE_MONITORING-REPORT-FINAL.DOCX)