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SECO -R <br /> ARCO Service Station No.6080 <br /> QMR 3007 I <br /> October 29,2007 <br /> Page 3 <br /> GROUNDWATER SAMPLE RESULTS AND DISTRIBUTION <br /> Dissolved MTBE Distribution <br /> MTBE has historically been detected in MW-1 through MW-3, with the highest concentration in <br /> MW-1. reported at 170 pglL in June 2001. MTBE concentrations have declined since 2001. <br /> MTBE was detected above the laboratory method reporting limits (MRL) only in one (MW-1) of <br /> the three wells sampled during 3Q07 at a concentration of 0.65 pg/L. <br /> i <br /> I <br /> Dissolved DIPS Distribution <br /> DIPE has historically been detected in only MW-3, with the highest concentrations reported at <br /> 13 pglL in December 2006. DIPE concentrations have dropped since 2006. i.DIPE was <br /> detected above the laboratory MRL in only one (MW-3) of the three wells sampled during 3Q07 <br /> at a concentration of 2.4 pg/L. <br /> QUALITY ASSURANCE 1 QUALITY CONTROL <br /> Analytical data was quality assured and quality controlled, using the SECOR Lab Validation <br /> Form. The data is acceptable without issue. <br /> 3 <br /> j <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> i <br /> I <br /> i <br /> 6080 3Q07 QMR.doe SECOR lntemationa!Incorporated <br />