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1 I <br /> x 06 July 1999 <br /> AGE-NC Project No 95-0135 <br /> Page 3 of 4 ^ <br /> t TPH-g was detected at a concentration of 21,000 µg/l in the sample from well MW-IA Sample <br /> MW-1B, collected from the upper screened casing of the well, contained TPH-g at a concentration <br /> Iof 910 µg1! ` <br /> The maximum toluene concentration detected was 83 µg/1, encountered in MW-IA The maximum <br /> ethylbenzene and total xylenes concentrations of 1,000 µg/l and 290 µg/l, respectively, were <br /> encountezed in sample MW-1 A <br /> The,oxygenated fuel additives DIPS and TBA were fuel additive detected in the water samples <br /> collected from the site DIPS was detected in wells MW-1B,,MW-2A and MW-3A at concentrations <br /> of 1 8 µg/l, 200 µg/l and 1 2�g/l, respectively TBA was detected in wells MW-1B, MW-2B and <br /> MW-3A at concentrations of 23 ug1l, 650 µg11 and 16 µg/l, respectively <br /> Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report <br /> (MAI Laboratory ID 99137 through 99142), Quality Control and Quality Assurance (QA/QC) and <br /> chain-of-custody are in Appendix B <br /> i r <br /> 40 SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> On 20 November 1998,the,ground water flow direction at the site was generally toward the <br /> north Ground water elevation has risen an average 0 22 feet between the sampling events <br /> The analytical data from the lower screened casing intervals of wells MW-1 and MW-2 <br /> indicted that the highest concentration of dissolved hydrocarbons remains in the western <br /> 1 portion of the,site and in the deep screened interval ' ^ �I <br /> Monitoring well MW-3 appears to be located near the eastern margin of the dissolved <br /> hydrocarbon plume The lateral extent of dissolved hydrocarbons is not defined west, south <br />' and north of well MW-1 or south and north of well MW-2 <br /> z <br /> I 4 , <br /> 5.0 RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends the following 5 <br /> A regular quarterly monitoring program should be established The neat monitoring event <br /> should conducted as soon as possible <br /> A <br /> 4dimrcedGcoEmiron mtntal Inc <br />