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10. The present wooden bridge over Deep Deep Bay is in danger of collapse. The highway department is currently considering two alternatives to alleviate the situation and provide for expected increases in future traffic. One plan is a conventional street bridge and the other is a tunnel under the bay. The department is familiar with bridge construction and maintenance but has no experience with maintenance costs for tunnels. The following data have been developed for the bridge: First cost $17,000,000 Painting every 6 years $1,000,000 Deck resurfacing every 12 years $3,000,000 One structural overhaul at the end of 30 years $4,000,000 Annual maintenance $300,000 10. The present wooden bridge over Deep Deep Bay is in danger of collapse. The highway department is currently considering two alternatives to alleviate the situation and provide for expected increases in future traffic. One plan is a conventional street bridge and the other is a tunnel under the bay. The department is familiar with bridge construction and maintenance but has no experience with maintenance costs for tunnels. The following data have been developed for the bridge: First cost $17,000,000 Painting every 6 years $1,000,000 Deck resurfacing every 12 years $3,000,000 One structural overhaul at the end of 30 years $4,000,000 Annual maintenance $300,000