ARCHIVED REPORTS 2011 YEAR 5 PHYTOREMEDIATION TREE MONITORING REPORT

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SECTION 4:YEAR 5 TREE MONITORING RESULTS 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 [20071 to 100 percent in Year 2 [20081). 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 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 damaged by beavers. 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. ' 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). Year 5 (2011) As shown in Appendix A,no trees were recorded as dead in this planting sub area in Year 5 ' (2011).The tree survivorship rate is 100 percent (Table 4-2). High tree survivorship (above 97%) was also noted in all previous monitoring years (Table 4-1). This planting sub area has the highest average survivorship rate of any of the six planting sub areas (Table 4-1). A small fire adjacent to Whiskey Slough Road during summer 2011 singed the foliage of a few trees in this planting sub area in Year 5 (2011). One trees was recorded as dead as a ' direct result of the fire,and the fire burned the lower branches of the trees located closest to '� SAC/4203071113570001(YEAR5-2011 HOLTTREE MONITORING_REPORT-FINAL.DOCX) 4-5