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h -y- <br /> 30 January 2004 <br /> AGE-NC Project No 01-0865 <br /> Page 4of7 <br /> The fuel additive MTBE was detected in the samples collected from wells MW-2 through MW-9 <br /> and EW-1 at concentrations ranging from 7 1 gg/l (MW-9) to 68,000 µg/l (MW-2), an iso- <br /> concentration map illustrating the approximate distribution of dissolved MTBE is depicted on <br /> Figure 6 In addition, the fuel additives TAME was detected in the samples collected from wells <br /> MW-2,MW-3,MW-6 and EW-1 at concentrations ranging from 19 gg/l(MW-3)to 54µg/l(EW-1), <br /> and TBA was detected in the samples collected from wells MW-2 and EW-1 at 860 gg/l and <br /> 110 gg/l, respectively <br /> No other fuel additives were detected at or above laboratory reporting limits in the ground water <br /> samples Previous and current ground water analytical results are summanzed on Table 2 The <br /> laboratory report (CTEL Lab Project No CT241-0401003), QA/QC report and chain-of-custody <br /> form are included in Appendix C <br /> 3 3 ANALYTICAL RESULTS OF SURFACE WATER SAMPLES <br /> No target analytes were detected at or above laboratory reporting limits in the surface water samples <br /> Previous and current surface water analytical results are summarized on Table 2 The laboratory <br /> • report (CTEL Lab Protect No CT241-0401003), QA/QC report and chain-of-custody form are <br /> included in Appendix C <br /> 4.0 ANNUAL SITE ASSESSMENT ACTIVITIES <br /> The following is a summary of the environmental assessment activities at the site during the 2003 <br /> calender year <br /> 41 SUBSURFACE INVESTIGATIONS <br /> AGE conducted the following subsurface investigations in year 2003 <br /> • On 03 and 04 November 2003, AGE advanced four soil borings at the site to assess the <br /> lateral and vertical extent of MTBE-impacted soil and ground water Soil probe borings B 14 <br /> through B17 were advanced vertically to depths ranging from 16 feet bsg to 28 feet bsg <br /> Continuous core soil samples were collected from all borings, grab ground water samples <br /> were also collected from every probe boring location A total of 15 soil samples and four <br /> ground water samples were submitted for laboratory analysis <br /> • On 15 through 17 December 2003,AGE advanced four Cone Penetration Test(CPT)borings <br /> . (CPT1 through CPT4) at the site to assess the vertical lithology and the extent of <br /> hydrocarbons-impacted ground water The CPTs were advanced between 90 and 110 feet <br /> Advanced GeoEnvironmentai,Inc <br />