Admin Order 58-12-14 - Laserfiche WebLink

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November 1, 2001 Addendum to Natural Resource Enhancement and Open Waterway Improvement Construction Unit Costs As requested by the City, URS has reviewed and recommended revisions to the construction activity /material unit costs developed for the Storm Drainage Master Planning project for open channel improvements (Types 1 and 2), natural resource enhancement, and natural resource revegetation. The distinction between these project types for basin planning was as follows: • Open channel improvements (Type 1) — Modify existing channels. Construction activities and materials included traffic control, excavation (0 to 10 foot bottom width, 4 to 6 foot depth, 3:1 side slopes), hydroseed, and erosion protection at inlets and outlets. • Open channel improvements (Type 2) — Modify existing channels. Construction activities and materials included the same elements as for Type 1 except channel excavation was increased to a 10 to 20 foot bottom width and 6 to 10 foot depth. • Natural resource enhancement — Plant additional vegetation. • Natural resource revegetation — Remove invasive vegetation, grade and revegetate. For each of these project types, overall unit costs were developed based on unit costs for construction activities and materials including: traffic control, general excavation, hydroseeding, trees and shrubs, riprap, and erosion control. In this letter, we revised our unit costs for the project construction activities and materials based on a review of bid tabulations from two recently completed enhancement projects in Eugene (i.e., the 1135 and ACE projects), the Longfellow Creek Habitat Improvement Project in Seattle, Washington, the Oregon Department of Transportation Historical Bid Price Listings, and the RS Means 2000 Heavy Construction Cost Data book. This letter report includes a description of how the specific construction activities /materials unit costs were revised, a discussion of how recommended unit costs were identified, a recommended new unit cost for natural resource enhancement, and a recommendation for computing construction costs for open waterway improvements. Unit Costs Compiled from Other Projects /Sources Table 1 presents the unit costs from the above mentioned projects and sources for each of the appropriate construction activities /materials. Clearing and grubbing, and grading were added to the list of construction activities and materials because it is likely that with most natural resource enhancement projects some clearing and grubbing of invasive vegetation or dead trees will be necessary and that regrading of the top soil will also be necessary. The range of unit costs, which can be compared with the existing basin planning unit costs, is provided in Table 1. From this range, we developed new recommended unit costs to be used for the construction activities /materials elements of the project types. For those elements that had unit costs from more than two projects /sources (i.e., general excavation, hydroseeding, trees, shrubs, and riprap) the average of the unit costs was recommended. For elements that had only two sources (i.e., clearing and grubbing, grading, and erosion control), the numbers were compared with the existing basin planning costs and an average was taken of all three. The recommended unit costs (rounded up to the nearest dollar) are presented in Table 1. 3