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Enti.tj' Factor Terms CWCB NRCS aMID 4 % at 30 years 8.25% at 25 Years 8.25% at 25 Years .0578 .0957 .0957 The terms are determined by each agency. aMID terms were based on NRCS values. Annual amortization costs are shown in Table V-C, Part A. b. Operation and Maintenance Costs O&M costs will include payroll for the maintenance crew, repairs, equipment replacement and vehicle maintenance, which are specific to each alternative (Table V-C, Part B). Routine daily maintenance consists of driving the route on a regular basis to adjust water turnouts and make sure there are no serious problems. There will also be periodic maintenance such as mowing weeds and making minor repairs. Major repairs might consist of replacing broken sections, repairing outlet valves and similar items. Routine daily maintenance on the ditch will be somewhat greater than on the pipeline. Weed control is more difficult and the ditch must be cleaned on an annual basis. There is greater potential for vandalism or damage from weather extremes. For the pipeline alternative, maintenance crews will probably have to clean the trash rack on a regular basis. It is probable that concrete will have to be repaired on a routine basis for the open ditch. 6. Methods for Numerical Comparison of Alternatives Both economic and non-economic factors will be compared using a Qualitative Evaluation Matrix (Decision Matrix). This concept was developed by EP A for evaluating alternatives for wastewater Facility Plans. Although costs are involved for each non-monetary factor, they are difficult to enumerate. The matrix provides a procedure for a more systematic and objective comparison. The procedure is to assign each factor or criteria a weighted value; in this case, each has a value of 5. Each alternative is then scored with respect to each criteria on a scale from 1 to 5, with the highest number being more favorable. In the evaluation matrix, the alternatives being evaluated are placed in columns and each is aligned against the criteria factors, which are placed in rows. This arrangement is shown in Table V-D. The values or scores are then added and the alternative with the highest total score is the highest ranking. The monetary factors can also be assigned a weighted value. In this case, it was assumed that monetary factors should be at least equivalent in overall V-14 I I I I I I I I I I I I I I I I I I I