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IV. ECONOMIC MONITORING AND EVALUATION tv t~ 1. setting & Methodology r-:. -J Cost of contract data was collected on 176 Salinity Planning Worksheets(SPW). The SPW collection has been for all contracts since 1992. Due to workload and need for database maintenance, future collection will be on fifty percent of the contracts. Detailed economic information was collected from producers that expressed an interest in a more in depth evaluation of effects from installing improved irrigation systems.' ' The average size of farms in contracts is 1.54 acres. Major crops in the area include: alfalfa, pasture grass, apples, and corn. stock reported are up to 800 head of beef with an average of 99 on 44 places and 3500 head of sheep with an average of 569 on 11. places. 2. Changes in Agricultural Production Items A summary of benchmark and treatment effects for plans included in the economic database as collected is presented below in table 8. Table 8 - Benchmark and Treatment Effects of Salinity Control Practices , Benchmark Treatment Grouo del1verv systems System type unlined ditch underground pipe Average Number of units served 4.85 # 4.85 # Average System length 5,657 ft 5,1.97 ft Labor per contract 30 hrs 90+ % reduction Farm deliverv systems System type unlined ditch underground pipe or lined ditch Average System length 5,093 ft 4,779 ft Labor per contract 43 hrs 7 hrs Field aoolication systems oer acre system type unlined ditch buried pipe & gated pipe or sideroll Non Machine Labor for Operation and Maintenance of system 1.6 hrs/acre 7 hrs/acre Table 9 shows the average total and annual cost for the installation of an improved irrigation system (total, government cost share, and producer costs), operation and maintenance costs and cost per ton of salt saved for on-farm systems based on planned contract data. Table 1.0 shows the same values as table 9 except for it displays group 21