ARCHIVED REPORTS_2010 YEAR 4 PHYTOREMEDIATION TREE MONITORING REPORT

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L LSECTION 4 L Year 4 Tree Monitoring Results LThis section provides the results of the Year 4 (2010) tree monitoring event.Monitoring was performed on November 16,2010. The Year 4 (2010) tree monitoring results are presented 1 below for each of the six tree planting sub areas. A tabular summary of tree survivorship L and health and vigor data for Year 4 (2010) is provided in the table in Appendix A. A comparison of health and vigor and tree survivorship rates for Years 2007,2008,2009,and 2010 is presented in Tables 4-1 and 4-2.For details on 2007, 2008,and 2009 tree survivorship and health and vigor ranks by planting sub area,refer to the Year 1, Year 2,and Year 3 Phytoremediation Tree Monitoring Reports for the Source Area at the SFPP, L.P. Holt Release Site, LHolt, California (CH2M HILL 2008a,2008b,and 2010). Photographs of all planting areas were obtained during the annual tree-monitoring field L 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) Year 4(2010) L Percent Percent Percent Percent Planting Site Survivorship Survivorship Survivorship Survivorship Area A 93% 88% 86% 93% Addition to Area A 97% 100% 97% 100% ` Area AA 96% 96% 96% 100% w Area B 90% 86% 96% 96% Area C 80% 80% 93% 93% L Area D 78% 82% 80% 78% Average Percent LSurvivorship(All Sites) 900W 900/0' 91% 93% NOTES: '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. 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. ` In planting areas Addition to Area A and Area A,trees that were damaged in the 2009 windstorm and counted as dead in Year 3(2009)resprouted from the rootstock in Year 4(2010),forming new growth.These resprouts were counted as live trees during Year 4(2010)monitoring,and this resulted in increases in survivorship between Year 3 L (2009)and Year 4(2010). LSAC(1667491103500001(YEAR42010_HOLTTREE MONITORING_REPORT-FINALDOCX) 41