ARCHIVED REPORTS 2011 YEAR 5 PHYTOREMEDIATION TREE MONITORING REPORT

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SECTION 4:YEAR 5 TREE MONITORING RESULTS ' Year 3 (2009) In Year 3 (2009) ten trees were recorded as dead in Area D (or approximately 20 percent of 50 planted). Black willows continued to have the highest mortality rate (7 trees recorded as dead) at this site. Two box elder and one valley oak also died. The average percent survivorship in this planting area in Year 3 (2009)was 80 percent,slightly lower than the previous monitoring year (2008) survivorship rate of 82 percent. In 2007,this was the only planting sub area with a percent survivorship lower than the 80 percent threshold. In 2008 ' and 2009, this site met the 80 percent survivorship goal. However,this site continues to have the highest mortality rate of all six planting areas (Table 4-1). The average heath and vigor score recorded in Year 3 (2009) was 1.7,a little more than halfway between"low" and"medium' ranks. This health and vigor score was the lowest of all six sub areas. Year 4 (2010) This site continues to have the highest mortality rate of all six planting sub areas (Table 4-1), ' likely a result of poor soils and surface disturbance. In Year 4 (2010),11 trees were recorded as dead in Area D (or approximately 22 percent of the 50 trees planted) (Appendix A).This value is below the 80 percent survivorship criterion. Area D is the only planting sub area in Year 4 (2010) that failed to achieve this success criterion. Similar to previous monitoring years,black willows had the highest mortality rate (6 trees ' recorded as dead) at this site.Three box elder and two valley oak also died (Appendix A). The willows and box elder may still have a live root-stock,and could resprout from the base,but this cannot be determined at this time. 1 The average percent survivorship in this planting area in Year 4 (2010) was 78 percent, slightly lower than the previous monitoring year (2009) survivorship rate of 80 percent ' (Table 4-2).Tree survivorship in 2008 was 82 percent, slightly exceeding the success criterion. In 2007, survivorship was 78 percent,below the 80 percent survivorship success criterion. ' The average health and vigor score in this planting sub area in Year 4 (2010) is 1.6. This is slightly lower than the Year 3 (2009) score of 1.7 and is also the lowest score recorded in any of the planting sub areas in Year 4 (2010). The Year 4 (2010) score of 1.6 corresponds to a little more than halfway between"low" and"medium' ranks.The health and vigor scores for this planting sub area in monitoring Years 1 and 2 (2007 and 2008) were also low (1.5 and 1.4) (Table 4-2). Year 5 (2011) In Year 5 (2011), the average plant survivorship rate was 76 percent,the lowest of all six ' planting sub areas (Table 4-1),likely a result of poor soils and surface disturbance (e.g., compaction). This percentage is slightly lower than the Year 4 (2010) plant survivorship (78 percent). In Year 5 (2011),12 trees were recorded as dead in Area D (or 24 percent of the 50 trees planted) (Appendix A).This survivorship value is below the 80 percent survivorship objective. Area D is the only planting sub area in Year 5 (2011) that failed to achieve this goal. ' SAG14203071113570001(YEAR5-2011 HOLTTREE MONITORING_REPORT-FINAL.DOCX) 4-11