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Tf
<br /> 31 October 1997
<br /> AGE-NC Project No 95-0137
<br /> Page 3 of 5
<br /> The following is a summary of volatile organic compounds detected in the wells at the site
<br /> • Tert-Butyl alcohol was detected at was detected in wells MW-1, MW-3 and MW-4 at
<br /> concentrations of 39, 14 and 14 ppb, respectively MTBE was only detected in well MW-1
<br /> at a concentration of 6 7 ppb While DIPE was only detected in well MW-3 at a
<br /> concentration of 14 ppb
<br /> • Bromochlormethane, n-Butyl benzene, sec-butyl benzene, 1,2-dichloropropane,
<br /> Isopropylbenzene, n-Propyl benzene, napthlene, 1,2,4-trimethylbenzene and 1,3,5-
<br /> trimethylbenzene were detected in well MW-1 at concentrations of 2 0 ppb, 2 7 ppb, 3 9 ppb,
<br /> 2 6 ppb, 3 7 ppb, 11 ppb,4 8 ppb, 41 ppb, and 8 6 ppb, respectively 1,2-dichloroethane and
<br /> Vinyl acetate were also detected an well MW-1 at concentrations of 150 ppb and 2 5 ppb,
<br /> respectively
<br /> • 1,2-dichloroethane,p-isopropyl toluene,napthlene,n-propyl benzene, 1,2,4-tnmethylbenzene
<br /> and 1,3,5-trimethylbenzene were detected an well MW-2 at concentrations of 160 ppb, 44
<br /> ppb, 110 ppb, 52 ppb, 300 ppb and 77 ppb, respectively
<br /> • N-butyl benzene, sec-butyl benzene, tert-butyl benzene, isopropylbenzene, napthlene, n-
<br /> propyl benzene, 1,2,4-trimethylbenzene and 1,3,5-tramethylbenzene were detected in well
<br /> MW-3 at concentrations of 5 6 ppb, 5 7 ppb, 2 7 ppb, 7 3 ppb, 25 ppb, 7 2 ppb, 31 ppb and
<br /> 16 ppb, respectively
<br /> • Sec-butyl benzene, dichloroethane, 1,2-dichloropropane and vinyl acetate were detected in
<br /> well MW-4 at concentrations of 2 8 ppb, 210 ppb, 16 ppb and 13 ppb, respectively
<br /> • Sec-butyl benzene detected in well MW-5 at a concentration of 2 0 ppb
<br /> Analytical results of ground water samples analyzed by EPA methods 8015m and 8020 are
<br /> summarized in Table 2 Analytical results for ground water samples analyzed by EPA methods 8260
<br /> are summarized in Table 3 The laboratory report (MAI Lab ID Numbers 81474 through 81478),
<br /> quality assurance and quality control (QA/QC) and chain-of-custody are included in Appendix B
<br /> 4 0. CONCLUSIONS AND RECOMMENDATIONS
<br /> 41 CONCLUSIONS
<br /> Based upon data collected during the October 1997 monitoring, AGE concludes the following
<br /> • The highest concentration of gasoline related dissolved hydrocarbons continues to be in the
<br /> area of monitoring well MW-2, located near the northern edge of the site Detectable
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