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square yard basis, the basin planning costs for trees /shrubs as part of natural resource <br />enhancement were approximately $25 /SY, while the recommended unit costs would be <br />approximately $6 /SY for either trees or shrubs. Another significant factor in the decrease of the <br />natural resource enhancement unit cost was the quantity of erosion control per SY in the basin <br />planning quantity tables. The basin planning quantity tables indicated that 0.008 acres (38.7 SY) <br />of erosion control would be applied every SY. It appears that this quantity was an error and that <br />the correct quantity for erosion control per SY would be 0.0002 AC (1 SY) per SY. <br />Open Waterway Improvements <br />Before this review, open channel improvements were divided into two different types (i.e., Type <br />1 and Type 2). Both the Type 1 and Type 2 improvements included traffic control, excavation, <br />hydroseeding, trees and shrubs, riprap, and erosion control. The estimated construction costs per <br />unit were based on lineal feet. During this review, it was determined that there was a need to <br />determine quantities for each open waterway improvement project specifically, rather than rely <br />on general quantities for the various construction activities /materials. The quantities that are <br />input into the cost tables have a significant impact on the overall cost of open waterway <br />improvements. The quantity of excavation, the area to be hydroseeded and the area disturbed for <br />which erosion control would be needed vary greatly between projects. Therefore, we are not <br />recommending a general construction unit cost for open waterway improvements. We are <br />recommending that each project be evaluated individually and that costs are developed based on <br />the recommended unit costs for construction activities and materials provided in Table 1. In <br />addition, if each open waterway improvement project is evaluated individually there is no longer <br />a need for two different types of improvements. Therefore, we recommend that these <br />improvements be combined into one category. <br />