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' 21 December 2001 <br /> AGE-NC Project No 99-0637 <br /> Page 3 of 3 <br /> The analytical results of ground water samples are summarized on Table 2 The laboratory reports <br /> (MAI Lab I D No 81334 through 81337),QA/QC report and chain-of-custody form are included in <br /> Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IBased on the data collected from the site, AGE finds <br /> • Ground water flow at the site on 18 October 2001 was inferred to be toward the southeast <br /> at a low gradient of 0 0004 feet/feet <br /> I • MTBE was detected in the ground water sample collected from MW4 at a concentration of <br /> 4,300µg/1(EPA Method 8260) No other analytes were detected in the groundwater samples <br /> collected at the site The lateral extent of MTBE-impacted ground water has been defined <br /> toward the northeast through southeast, but is not defined from north to west to south of <br /> MW4, located west of the former UST pit The current MTBE isocontour map is depicted <br /> on Figure 4 <br /> I5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> continued quarterly monitoring of the ground water monitoring wells on-site The next monitoring <br /> event should be performed in January 2001 <br /> A work plan to install additional monitoring wells and advance deep soil borings has recently been <br /> approved by PHS-EHD AGE anticipates the work will be performed during the first quarter 2002 <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluation of the hydrogeo logic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> points(ground water samples)and subsurface conditions may vary away from these data points No <br /> other warranty,expressed or implied, is made as to the professional recommendations contained in <br /> this report <br /> • <br /> Advanced Ceo$nvironmentai,Inc <br /> I <br />