Appendix B

Cost Calculations Over 150-Year Life Cycle of the GAEP

 

The assumptions used in calculating the costs of the coverage are as follows:

 

plastic: replaced every 10 years at a cost of $140,000/sq. mi.

 

installation: also every 10 years at a cost of $35,000/sq. mi.

 

monitoring: cost per sq. mi. is $8750, 50% from labor and 50% from

equipment (replaced every 30 years)

 

maintenance: cost per sq. mi. is $30,000, 65% from equipment (replaced

every 30 years) and 35% from labor

 

The cost of the plastic cover for coverage installed in year 1 and carried through to year 150 for 1 sq. mi. is as follows:

 

Plastic $140,000 x 15 replacements = $2,100,000

Installation $ 35,000 x 15 replacements = $ 525,000

Monitoring

Labor $ 4,375 x 150 years = $ 656,250

Equipment $ 4,375 x 5 replacements = $ 21,875

Maintenance

Labor $ 30,000 x 0.35 x 150 years = $1,575,000

Equipment $ 30,000 x 0.65 x 5 replacements = $ 97,500

Total $4,975,625

 

$4,975,625 x 67,000 sq. mi. = $333 billion for all year 1 coverage at the end of year 150. Divided by the tons of carbon equivalent emissions offset of 19.5 billion gives $17.1/ton.