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A Success Story: <br /> Ozone • . • • Pilot Test <br /> at . n MtBE, Site in Long Island, • <br /> Background <br /> LFR Levine Fricke conducted a pilot study to evaluate the efficacy of an ozone and air-sparging system for in- <br /> situ treatment of methyl tertiary-butyl ether(MtBE)and benzene, toluene, ethylbenzene and xylenes (B-1 EX) <br /> impacted groundwater at a gasoline spill site on Long Island, New York Two ozone-air sparge points were <br /> installed at different depths in a single borehole to maximize the conical diffusion of the gasses in the medium- <br /> to coarse-giain sand aquifer Monitoring wells were installed at twelve and twenty-eight feet downgradient of <br /> the sparge points to measure the magnitude of hydraulic effect and to monitor changes in groundwater quality <br /> resulting from addition of ozone and air <br /> Results MTBE and BTEX Concentrations vs Time <br /> Pressure data from down-hole transducers and Pilot Test Well LFR-4(12'from Ozone Sparge Well) <br /> b0 <br /> measurements of dissolved oxygen in groundwater - na �- <br /> ni l;-4 4° rt� g <br /> were used to evaluate the area of influence of the40 <br /> �� <br /> sparging s stens These data confirmed that he <br /> y at t ozone- <br /> air sparge system had a down-gradient radius of 35 b ' <br /> h yw µ �t ♦ x t R <br /> 30 <br /> ` <br /> Influence of at least 28 feet _ 1, ens <br /> i zs <br /> Changes in MtBE concentration in groundwater were20 <br /> monitored and destruction rates estimated using 15 Ap 7` vta�a� � 5 ' <br /> rp..r4 �3 <br /> analytical results from weekly samples collected from � 1 a � _ <br /> 10 <br /> the monitoring points The graphs at right plot MtBE <br /> concentration versus time for LFR-4 (12 feet down- s <br /> gradient of the sparge well) and LFR-2 (28 feet 1/29/2001 202001 2118/2001 212812001 311012009 3Rof1001 Z 30ao01 410/2001 <br /> downgradient of the sparge well) <br /> Pilot Test Well LFR-2 (28'from ozone Sparge Well) <br /> After four weeks of ozone-air sparging MtBE 7" _ m <br /> concentrations in LFR-2 decreased from 6,304 parts <br /> per billion (ppb) to 1,700 ppb, a 73% destruction rate sono »` � � � � ti;��1 A <br /> MtBE concentrations continued to decrease for three <br /> s x � — <br /> weeks after the four-week ozone-air sparging period ; <br /> to 79 ppb, a 99% destruction rate, at week 7 BTEX a 4000 M <br /> °° _ � <br /> concentrations in LFR-2 realized similar decreases 3000 x� <br /> I 4 F <br /> LFR-4 MtBE concentrations decreased from 45 ppb to 2000 <br /> 1 I ppb in the four week ozone-air sparge period, a4 'w <br /> 76% destruction rate MtBE concentrations continued 1006 <br /> to decrease for three weeks after the four-week ozone- R W. 'I ` ' <br /> a � <br /> air sparging period to 2 ppb, a 96%destruction rate, V2912001 2/8/2601 ?Jl& of Mar2001 3/102W1 3120f2001 313=001 4MI2001 <br /> at week 7 BTEX was not initially detected in this <br /> well, however a spike in BTEX concentrations Legend _ e,,,,,8.,„ o-,Y,a <br /> occurred after two weeks of ozone sparging <br /> Conclusions <br /> LFR has performed a successtul pilot clearly demonstrating the efficacy of the ozone and air sparging <br /> technology for remediation of MtBE and BTEX impacted groundwater This innovative remedial technology is <br /> a cost-effective and timely alternative for the conventional pump and treat remedial technologies <br />