Doing the Math on Teacher Pensions: How to Protect. Teachers and Taxpayers. Do the math on teacher pensions and it just doesnât add up. In 2014 teacher pension systems had a total of a half trillion. dollars in unfunded liabilities â a debt load that climbed more than $100 billion in just the last two years. Across the.
1 These prices can double for a roadway-quality driveway (geotextile fabric covered with three layers of compacted gravel, each about 3-4 thick), or $450 -$1,800 for 12'x25' and $11,000 -$60,000 or more for a driveway 12' wide and a quarter-mile long. A cubic yard of driveway-grade crushed gravel costs about $10 -$60 or more, depending on whether it is picked up by the customer at the gravel yard or delivered to the job site, and the size and type of gravel used.
1 A gravel driveway starts at roughly $0.75 -$3 or more a square foot, or $300 -$1,000 for a 12'x25' single-car driveway. 2  Costs can double for a roadway-quality driveway. 3  Loose gravel will need replenishing periodically, but a correctly designed, installed and maintained gravel driveway can last 50-100 years or more. Macadam typically lasts 6-10 years and provides the decorative and rustic appearance of a gravel driveway but with a firm base. 2  An asphalt driveway costs about $2 -$5 a square foot, or $1,200 -$3,000 for 12'x50' to $31,000 -$75,000 for a 12' lane a quarter mile long.