ARCHIVED REPORTS 2009 YEAR 3 PHYTOEMEDIATION TREE MONITORING REPORT

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' SECTION 4 Year 3 Tree Monitoring Results ' This section provides the results of the Year 3 (2009) tree monitoring event. Monitoring was performed on October 22, 2009. The Year 3 (2009) tree monitoring results are presented below for each of the six tree planting sub areas. A tabular summary of tree survivorship and health and vigor data for Year 3 (2009) is provided in the table in Appendix A. A comparison of health and vigor and tree survivorship rates for Years 2007,2008, and 2009 is presented in Tables 4-1 and 4-2.For details on 2007 and 2008 tree survivorship and health and vigor ranks by planting sub area,refer to the Year 1 and Year 2 Phytoremediation Tree Monitoring Reports for the Source Area at the SFPP, L.P. Holt Release Site, Holt, California ' (CH2M HILL 2008a,2008b). Photographs of all planting areas were obtained during the annual tree-monitoring field visit to document tree system health and performance and are provided in Appendix B. The approximate location of the three planting zones is depicted in Figure 1-3.The location of the six tree planting sub areas is shown in Figure 1-4. TABLE 4-1 Tree Survivorship by Monitoring Year ' Year 1 (2007) Year 2(2008) Year 3(2009) Percent Percent Percent Planting Site Survivorship Survivorship Survivorship ' Area A 93% 88% 86% Addition to Area A 97% 100% 97% Area AA 96% 96% 96% Area B 90% 86% 96% Area C 80% 80% 93% Area D 78% 82% 80% ' Average Percent Survivorship (All Sites) 900W 90%' 91% 'The average Year 2(2008)survivorship rate is 89.6 percent(rounded in Table 4-1 and Appendix A to 90 ' percent).This is essentially the same as observed in Year 1 (2007).The overall survivorship rate in 2007 was 89.5 percent. Note: Limited tree replanting was conducted in 2007 and 2008. Replanting caused survivorship averages in some parts ' of the site to increase between Years 1 through 3. ' SACI166749/PANAGON(YEAR3_2D99_HOLTTREE-MONITORING REPORT.DOC) 4-1