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TERRA VAC Estimated Costs: Excavation Alternative I (Class II Landfill Dispqsal) • Excavate, backfill, and compact -- 6,800 cu yd. (with shoring and dewatering) —$270,000 • Hauling soil for off site disposal and delivery of backfill ---$115,000 • Soil disposal at a Class II landfill --$176,000 Total estimate cost of this over excavation alternative is approximately $561.060. Excavation Alternative II (Class III L andflI Di�posa]) • Excavate, backfill and compaction -- 6,800 cu yd. (with shoring and dewatering) —$270,000 $ 7a,000 • Hauling soil for off site disposal and delivery of backfill ---$115,000 • Soil disposal at a Class III landfill —$82,000 Total estimated cost of this over excavation alternative is approximately $467,000. 9.3 Oxygen Releasing Compounds Oxygen Release Compound, ORC®, is a patented formulation of magnesium peroxide capable of slow and sustained release of molecular oxygen when hydrated.. Naturally occurring micro-organisms thrive in the oxygen-enriched environment facilitated by ORC; these aerobic microbes begin to degrade toxic organic hydrocarbon compounds into harmless by-products. Typically, ORC will release oxygen for about six months to one year. The manufacturer states that field test results have shown that ORC significantly enhances the aerobic-bioremediation of contaminated soil and groundwater more cost-effectively than alternative treatment methods. Terra Vac downloaded a copy of the manufacturer ORC Applications Software from the Internet. Terra Vac performed three application models to estimate the cost of the ORCs required to treat the site. The three application models performed included; • ORC slurry backfill • ORC slurry injection into 31 geoprobes spaced 10 apart, • Source treatment using eight monitoring wells spaced 9 feet apart. Appendix G presents the three application model print outs. The ORC cost required to remediate this site ranges from $194,000 to $216,000 exclusive of well or geoprobe installation costs. A fourth application model used for unknown contaminant levels p showed ORC costs of approximately $221,000. Total cost for remediating the site using i this approach is conservatively estimated at $250,000 -- $300,000, Terra Vac is unable to estimate the time required to complete the remediation using this method, 9.4 Vapor Extraction and Air Sparging Terra Vac has determined that dual vapor extraction (I)VE) may not be an appropriate remediation technology for the clean up of impacted vadose zone soils. In a letter report, dated April 12, 1995, Terra Vac recommended soil vapor extraction augmented with air it Project 30-0212 13 caalton130-02121caplrev5lcap-rev5.doe July 15, 1998 A I,