TABLE ES-6
SUMMARY OF COST ESTIMATES FOR
REMEDIAL ALTERNATIVES
| ALTERNATIVE | CAPITAL COSTS* | TOTAL O&M PRESENT WORTH COST* |
NET PRESENT WORTH AT 7% RATE* |
| Alternative 1. No Action with Monitoring |
$52,200 | $865,200 | $917,400 |
| Alternative 2. Engineered Cell |
$8,002,000 | $1,234,000 | $9,236,000 |
| Alternative 3. Moderate Excavation, Off-site Disposal, and RCRA Cap |
$14,520,000 | $982,200 | $15,510,000 |
| Alternative 4. Large-scale Excavation and Off-site Disposal |
$24,130,000 | $489,900 | $24,620,000 |
| Alternative 5. Moderate Excavation, Soil Washing, Off-site Disposal, and RCRA Cap |
$14,910,000 | $982,200 | $15,900,000 |
| Alternative 6. Moderate In-situ Vitrification and RCRA Cap |
$19,160,000 | $982,200 | $20,140,000 |
Notes:
* Rounded-off figures (net present worth cost does not
always equal sum of capital and O&M cost).
7% discount rate after inflation is used for present worth figures.
All monitoring costs are determined using a duration of 100 years except
for Alternative 4 which uses a duration of 50 years.