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The valuation is based on replacement of the same species in a location back from where the road cut may eventually end. This would be 12-15 feet back from the preset cut. Nursery stock ofDouglas-fir is not readily available but it is believed 2-4 foot stock can be obtained. Ponderosa pine could be substituted For the Douglas-fir since they grow naturally in the same ecosystem. Trees larger than 4' would be too difficult to handle and move to the planting site. When replacing larger trees, a reasonable approach is to use smaller survivable-sized trees and determine the number of years for them to reach and equivalent size (called parity). In 30 years, aDouglas-fir or ponderosa pine could reach a size that would create a forested effect and would be similar to other younger trees now in the area. To determine the monetary value, the cost of the tree and its installation are compounded over the 30 year time period. A 6% interest rate is used for this valuation (Federal Discount Rate for Project Evaluations). The figures are then adjusted for location (42%) and condition of the original trees (87%). Since the site is rocky and dry and a nursery would not likely plant and guarantee the trees, two trees are recommended for each tree that maybe lost. The basis of this is there could be 50% mortality. In addition to the installed plant cost, there is a maintenance cost. Transplanted trees need water for survival. It is estimated irrigation will be needed for four years after planting. An irrigation system with a 1"poly pipe running from the dwelling to the planting site along with drip emitters for distributing the water will be required. Thirty gallons of water should be applied monthly if rainfall is not adequate. This irrigation pipe can be attached to the dwellings outside spigots. Rather than poly pipe, sections of garden hose can be run to the trees as needed. The cost of installation and maintenance for four years is $900. Based on the Replacement Cost Method, I determined values as: Installed Plant Cost $3,600. Maintenance Cost $ 900. Total Apprised Value $4,500. In my opinion, the Trunk Formula Method reflects the most accurate estimate of value in this case. The Cost to Cure Method of valuation is also appropriate. As previously mentioned, the construction of a retaining structure to prevent continued sloughing is an option. A retaining structure or wall would prevent further damage to the existing trees. If the cut slope was stabilized and soil placed over the exposed roots, there would not be a loss of the trees. The determination of this cost is an engineering function and beyond the scope of general Plant Appraisal.