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• • 2.0 PW70REMEDIATI0N 2.1.4 North of Warehouse Area Figure 5 shows the conceptual design for the area north of the warehouse. The northern edge is approximately 190 feet wide;the southern edge is approximately 240 feet wide and approximately 100 feet long.This area will have 5 rows of variable length with an estimated capacity of 90 trees. 2.2 Preparation, Planting, and Maintenance Site preparation includes all site activities to be performed prior to tree planting. These activities include: • Remove broken asphalt and other undesirable materials on the ground adjacent to the forming bagging plant. • Establish level grade in all four planting areas (this will require dry conditions). • Layout tree areas for proper spacing. • Install new water meter and subsurface water supply for irrigation of new trees. • Procure hybrid poplar whips and willow poles. • Drill boreholes and plant hybrid poplar whips and willow poles. ' • Install irrigation system to be functional by May 2000 (may also be installed after planting). 1 A schematic of a planted poplar"whip"is shown on Figure 6. A nominal 8-inch borehole will be drilled to a nominal depth of 5 feet below grade using a truck-mounted auger. The whip will be placed in the hole and the hole will be backfilled manually using native material. Lastly, a protective cage will be secured at the ground surface to minimize damage from rodents and other pests. It is estimated that it could take up to 4 years for the new groves to reach a stage of closed canopy(a condition where the branches of trees intersect both within the row and also between rows). It is expected that the poplar groves will be inspected and maintained on a twice monthly basis during the first five growing seasons.Contractor responsibilities include visiting twice monthly to maintain the poplar groves,replanting trees that have been lost,maintaining the irrigation system,and performing routine maintenance such as weed and leaf removal. Leaf removal is an essential element for the continued success of this remedy,in that decaying leaves could add nitrogen to the system if they are not removed. Irrigation in the existing grove for the first two growing seasons consisted of watering once weekly for a period of 12 hours. A similar approach will be used for the new groves.Based on results in the existing test grove,it is anticipated that the root system of the trees will reach groundwater and will no longer require irrigation after the first two growing seasons. RDD/003670317.DOC(CAH710.D0C) 9