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. . . The proposed length of the modifications to the streambank is approximately 365 feet. In any case, proper placement of the bedding and riprap or riprap for alternative I, and the riprap for alternative 2 is extremely important. Proper installation and securing of the concrete mats for alternative 3 is equally important. Whichever alternative is chosen, the material must be properly toed in at least 3 feet below the grade of the streambed to prevent failure of the project. Proper depth of bedding and rock is also very important. It is recommended that a qualified engineer perform construction inspections during and after construction of the project to check for proper installation. Plan and detail sheets for the proposed construction alternatives are presented in Appendix A. The landowners should spread a native grass seed mixture on all disturbed ground areas immediately following construction. Willow posts should be planted at regular intervals above the revetment line on the channel side slopes to provide further stabilization. The homeowners should also obtain a construction bid for each of the alternatives prior to making a final decision on the desired approach. The engineer's quantity and cost estimates are presented in the next section. VI. QUANTITY AND COST ESTIMATES Quantity and cost estimates for the three selected alternatives have been prepared for this feasibility study. These estimates are based on data from previous projects, available cost information at the time of this study, and engineering judgment. Actual construction bids from local contractors may vary. Due to the nature and extent of emergency work in the project area and surrounding communities, actual material and labor costs may be unreasonably inflated to take advantage of the demand. The numbers presented below represent the engineer's estimate of "reasonable" costs for the specified alternatives. 8