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LSECTION 3:TREE SYSTEM MONITORING METHODOLOGY <br /> L. 3.1.5 Post Plant-Establishment Monitoring <br /> 1 The purpose of post plant-establishment monitoring is to assess tree survivorship and <br /> Lhealth and vigor of the phytoremediation system following the period in which most active <br /> site maintenance was performed (for example,irrigation). Typically,water needs decrease <br /> as the roots reach the natural water table, and, eventually,supplemental water will no <br /> longer be needed.Once trees no longer require irrigation or other active maintenance they <br /> are considered to be established. <br /> LThe need for weed control and other site maintenance actions is also expected to decrease as <br /> the trees are established.Weed control will be conducted on an as-needed basis during the <br /> entire 5-year monitoring period. Weed control is to decrease the water demands of the trees <br /> due to competing weeds,and reduce the risk of fire due to dense weeds and grasses at the <br /> site. <br /> If problems are identified during the post plant-establishment period that may adversely <br /> L affect the success of the phytoremediation system,remedial measures will be identified and <br /> implemented as part of ongoing site maintenance activities. <br /> L 3.2 Site Maintenance <br /> Site maintenance was performed during the 3-year plant establishment period as described <br /> I in the Phytoremediation Cleanup Plan. As trees become naturally established,limited site <br /> maintenance is being conducted during the post plant-establishment period and is planned <br /> for Year 5 (2011).Weed control or supplemental watering may be conducted in limited areas <br /> during Year 5,but this will be determined on an as-needed basis. Maintenance activities <br /> performed to date include: <br /> L • Replacement of trees damaged by beavers <br /> • Irrigation of planted trees <br /> L • Irrigation system inspection checks <br /> • Periodic irrigation system repairs and maintenance <br /> • Weed control within planting basins and within the planting area <br /> L • Maintenance of the watering basins and mulch <br /> • Other plant replacement(as needed) <br /> • Installation and maintenance of wire cages around trees for beaver protection <br /> LLimited pruning of trees that are outgrowing wire cages <br /> L <br /> L <br /> SAC11667491103500001(YEAR4-2010_HOLTTREE_MONITORIN(3_REPORT-FINAL.DOCX) 3-3 <br /> r <br />