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00) 91 Vapor Extraction Feasibility Study Findings and Recommendations Both the VOC field screening and laboratory analytical data demonstrate that soil vapor hydrocarbon concentrations can be extracted from the vadose zone Data collected during the VEFT demonstrates that vapor extraction can be utilized for remediation of vadose zone soils at the site, and that vapor extraction technology is appropriate for remediation The established radius of influence for vapor extraction based on the feasibility study is at least 66 feet However, a more conservative radius of influence of approximately 50 -feet can be established as a reasonable design parameter Based on the design radius of influence, an additional two vapor extraction wells should be installed on-site In addition, the VEFT demonstrates that remediation equipment capable of extracting and treating 250 CFM of soil vapor could be used for remediating the site The hydrocarbon removal rate (R) is a function of volumetric flow rate (V) of the specific remediation equipment used and hydrocarbon concentration (C) of the influent soil vapor stream Based on a theoretical maximum flow rate of 250 ACFM for a proposed vapor extraction remediation system and a maximum TPHg concentration of 17,000 ppmv from analytical data collected during the VEFT, a theoretical maximum_hvdrorarbon removal rate (R) of 1,422 pounds per day (lb/dav) from the site can be caiculated from the fullowing-4LLdLL i. R=(V C Mw F1)/(F2 F3), where R -- Hydrocarbon Removal Rate (lb/day), V — Volumetric Flow Rate (ACFM), C — Hydrocarbon Concentration, Mw — Molecular Weight of Gasoline (86 lb/lb-mole), F1 — Minute to Day Conversion (1,440 minutes/day), F2 — Conversion Factor (1,000,000/parts per million), F3 — Ideal Gas Mass Conversion (370 cubic feet/lb-mole) However, the actual maximum destruction capability of a typical 250 CFM thermal oxidizer is approximately 600 lb/day Therefore the destruction capabilities of the proposed remediation system equipment should be used as the limiting factor for calculation hydrocarbon mass removal rates 9 2 Air Sparge Feasibility Study Findings and Recommendations Data collected during the ASFT demonstrates that air sparging may be utilized for remediation of vadose zone soils and groundwater at the site, and that air sparge technology is appropriate for remediation The established design radius of influence for air sparging based on the feasibility study is at least 59 feet However, a more conservative air sparge radius of influence of approximately 50 feet can be established as a reasonable design parameter In addition, the ASFT demonstrates that air sparge remediation EZ 100966 CAP S \EZ ServelEZ 1009661Reports1100966CAP 18 ATC ASSOC73te5 lnc ATC Project No 43 25827 0026