ARCHIVED REPORTS 2009 YEAR 3 PHYTOEMEDIATION TREE MONITORING REPORT

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SECTION 4:YEAR 3 TREE MONITORING RESULTS ' TABLE 42 ' Health and Vigor by Monitoring Year Year 1 (2007) Year 2(2008) Year 3(2009) ' Health and Vigor Health and Vigor Health and Vigor Planting Site Score Score Score ' Area 2.6 24 25 Addition to Area A 2.2 2.4 2.5 Area AA 2.2 2.2 2.4 , Area B 1.8 1.6 2.3 Area C 1.6 1.3a 1.9 ' Area D 1.5 1.4a 1.7 Average Health and Vigor Score ' (All Sites) 1.96 1.9° 2.2° 'Subsequent to annual tree monitoring, tree replanting in Areas C and D was performed in late-November 2008. Survivorship in these areas assessed in Year 3(2009). , °Due to rounding,scores for both 2007 and 2008 are 1.9.The average health and vigor score in 2007 was 1.94;the average health and vigor score in 2008 was 1.90. Notes: Vigor Ranks: , (3)-high vigor score (2)-medium vigor score (1)-low vigor score (0)-tree dead ' 4.1 Area A , Area A supports all three planting zones (lower,middle and higher) and therefore has a high diversity of planted tree species (Figures 1-3 and 1-4). Six species of trees were planted ' in this area. Year 1 (2007) ' The mortality rate in this planting area in Year 1 (2007) was low (Table 4-1). Three box elder trees died in 2007(3 out of 42 trees) (CH2M HILL 2008). These trees were all located in the higher planting zone where depth to groundwater is greatest. On average,for all six species ' combined,plant survivorship in Area A was 93 percent in Year 1 (2007). The average heath and vigor score was 2.6,which corresponded to a rank in between"high" and "medium'. Year 2 (2008) ' The mortality rate in this planting area remained low in Year 2 (12 percent). Four box elder , trees and one black willow tree died (or 5 out of 42 trees). All of the box elders were within the higher planting zone,where conditions are driest. The black willow tree was within the lower planting zone,a more mesic part of the planting area. On average,for all species , combined,plant survivorship in Area A in 2008 was 88 percent,slightly lower than in Year 1 (2007). The average heath and vigor score of 2.4 is slightly lower than that observed in Year 1 (2.6),but this score is still in between"high" and "medium' ranks. This was the highest ' 42 SAC/166749/PANAGON(YEAR3_2D09 HOLTTREE_MONITORING_REPORT.DOC)