ARCHIVED REPORTS_2010 YEAR 4 PHYTOREMEDIATION TREE MONITORING REPORT

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SECTION 4:YEAR 4TREE MONITORING RESULTS Year 1 (2007) Two trees,one box elder and one Fremont cottonwood (out of a total of 60 trees),died in this planting area.The average percent survivorship was 97 percent(Table 4-1). This sub area has the highest plant survivorship of all six planting areas.The average heath and vigor score is 2.2,which is slightly higher than a"medium' rank. Year 2 (2008) Limited replanting in the Addition to Area A planting sub area was conducted in 2007 to replace trees killed by beavers. As shown in Table 4-1,plant survivorship increased between 2007 and 2008 (from 97 percent in Year 1 [2007] to 100 percent in Year 2 [2008]).The average heath and vigor score in Year 2 (2008) was 2.4,slightly higher than the 2007 rank of 2.2.A score of 2.4 is roughly in between"medium' and"high" ranks. Year 3 (2009) As shown in Table 4-1,plant survivorship in this planting area decreased slightly between J Year 2 (2008) and Year 3 (2009) (from 100 percent in Year 2 to 97 percent in Year 3).This rate of survivorship (97 percent) is the highest calculated for all planting areas in Year 3 (2009) (Table 4-1). Two Fremont cottonwoods died in this planting area in Year 3 (2 out of 60 trees). One tree was uprooted during the mid-October windstorm and the other tree was likely l damaged by beavers. J The average heath and vigor score in Year 3 (2009) was 2.5 (Appendix A),slightly higher than the 2007 and 2008 ranks of 2.2 and 2.4(Table 4-2). A score of 2.5 is roughly in between "medium' and"high" ranks. J Year 4(2010) A total of 60 trees were planted in Addition to Area A. In Year 4 (2010), tree mortality was not observed in this planting area (100 percent survivorship) (Appendix A).This is a slight increase over the 97 percent survival rate observed in Year 3 (2009) (Table 4-1). This increase in tree survival is due to new growth recorded on trees previously assumed dead. In Year 4 (2010),one of the wind-damaged cottonwoods in this planting area that was recorded as dead in Year 3 (2009) formed new lateral branches next to the broken stem.Stump-sprouts (new growth arising from the ground) were noted in Year 4 (2010) next to the cottonwood that had been topped by beavers in Year 3 (2009). In Year 4 (2010),the average heath and vigor score was 2.3 (Appendix A).A score of 2.3 is slightly lower than in between"medium' and"high" ranks.Scores have varied little over the last four monitoring years. The Year 4(2010)health and vigor score of 2.3 is slightly lower than the 2009 (2.5) and 2008 (2.4) scores,but is higher than the 2007 score of 2.2 (Table 4-2). 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 J recommended for the lower planting zone were installed (Fremont cottonwood and black willow). A total of 23 trees were planted in this area. 4-4 SAC11667491103600001(YEAR4-2010HOLTTREE MONITORING REPORT-FINAL.DOCX)