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Mr Mike Infurna <br /> . <br /> April 21, 2005 <br /> Page 2 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Well MW1 contained TPHg, benzene, toluene, ethylbenzene, and xylenes at concentrations of <br /> 800 parts per billion (ppb), 37 ppb, 0 9 ppb, 9 1 ppb, and 2 8 ppb, respectively No MTBE <br /> was detected in well MW 1 <br /> Well MW2 contained TPHg, benzene, toluene, ethylbenzene, and xylenes at concentrations of <br /> 290 ppb, 11 ppb, 1 0 ppb, 45 ppb, and 1 7 ppb, respectively No MTBE was detected in well <br /> MW2 <br /> No gasoline constituents were detected in well MW3 Analytical data are summarized in Table <br /> 2 Laboratory reports and chain-of-custody documentation are included in Attachment B <br /> SU1VIlVi4,RY AND CONCLUSIONS <br /> Groundwater flow beneath the site was toward the northeast, which is consistent with historical <br /> measurements Low levels of TPHg and BTEX constituents were detected in groundwater <br /> samples collected from wells MW1 and MW2 No gasoline constituents were detected in well <br /> MW3 No MTBE was detected in any site well <br /> • The current levels of benzene and TPHg in well MW1 represent reductions of 82% and 62%, <br /> respectively, from historic highs The current levels of benzene and TPHg in well MW2 <br /> represent reductions of 94% and 97%, respectively, from historic highs These trends <br /> illustrate that that natural attenuation processes are actively reducing contaminant <br /> concentrations beneath the site Tune versus concentration plots of benzene and TPHg, <br /> respectively, in wells MW1 and MW2 are presented to Figures 3 and 4 <br /> Please contact the undersigned at (209) 838-9888 if you have any questions regarding this report <br /> Respectfully, r�n <br /> s` r <br /> Ground Zero Analysis, Inch <br /> C1-_� J011:11i P rY�1 <br /> Jo P Lane r\"�tL <br /> CA Registered Geologist 6795 <br /> n `1 <br /> Attachments ='- ' <br /> .__ <br /> G 1GROUNDZETESTANATESTANA 0361REPORTSIANNUAL05b doc <br />