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Geologcca l hn lice Page 6 7'ecccs George's Service Feasibility Study Project No 425 2 April 28,2004 The AOPs have been very successful at treating gasoline compounds and the gasoline oxygenated fuel compounds AOPs are promising because they quickly destroy the ' contaminant rather then augmenting the relatively slow biological processes at the site Typically, AOPs use one or more of the following to create the hydroxyl radical ' • Hydrogen peroxide • Ozone ' • Fenton's reagent Oxygen Releasing Compounds (ORCs) ' Oxygen Release Compound (ORC) has been shown to aid in the natural attenuation degradation of petroleum hydrocarbons in the soil and groundwater ORCs could be used at this site relatively quickly and the installation process would be relatively inexpensive ' ORCs are magnesium peroxide compounds that slowly releases oxygen once it is hydrated The byproducts of the reaction are oxygen and magnesium hydroxide The material continues to release oxygen in the subsurface for approximately 6 months after application The ORCs are installed using a GeoProbe direct push rig and a pressure pump A series of borings are pushed to a determined depth then a slurry of ORC is pumped through the drill rods under pressure as the rods are retrieved from the boring The borings are drilled in a grid pattern in the area of highest groundwater contamination The application and cost of ORC and an AOP are very similar, however the AOP has the 1 advantage because it is directly breaking down the contaminant where the ORC is only increasing oxygen to aid in bioremediation Bioremediation is a relatively slow process that can be dependent on site conditions other then dust oxygen levels 3.0 ASSOCIATED PROJECT COSTS ' 31 In Situ Chemical Treatment GTI has obtained estimates to perform in situ remediation at the site The following estimates are based on similar work at other sites A three bidding process will be used to ' determine actual costs upon approval of a Corrective Action Plan Description Estimated Costs Project Planning & Coordination $ 7,000 Install Injection Wells (install and modify0 arious depth wells) 30,000 In Situ Oxidation Estimate (16 events) 95,000 Background Data Collection 2,000 ' Background Data (Gen Min, TOC, metals, alkalinity, COD, BOD, etc) 2,000 Field Work Supervision & Sampling - Infection Cycle (bi-weekly) 18,000 Analyses During Infection Cycle (GW analyses) 9,000 ' Project Management & Supervision 10,000 Data Evaluation & Reporting 10,000 Abandon Injection Wells 9,000 $192,000 1