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-•1O May 1998 <br /> AGE-NC Project No. 95-0106' <br />' :.Page'3 of 4 <br /> Analysis by EPA Method.8250 did not detect MTBE in any of the:samples analyzed, but did detect <br />' 1,2=dichloroethane at a concentration'of 1.0b in the sample collected from MW-1. Additionally-' <br /> pp p Y, <br /> isopropylbenzene{18 ppb), hapthalene (85 ppb);n-propyl benzene{33.ppb); 1,2,4-trimethylbenzene. <br /> (270 ppb);. 1,3,5-trimethylbenzene'(33'ppb) and vinyl acetate .(21 ppb), were detected by EPA <br />' ,.Method:8260 in•the sam lecollected from MW4.3TE&X concentrations detected by EPA Method <br /> 8260 Were similar;to the.concentrations detected by EPA.Method 8020. The BTE&X concentrations <br /> d'etected.by EPA Method 8250'are presented in�Table 3:`Oxygenated'volatile organic compounds <br /> were hot`detected in an .of-theground atersamples: Analytical results of ground water., <br /> samples , <br /> are summarized on Table 2. <br /> IV. <br /> ,Thelaboratory-report- (MAI Laboratory° ID. 87843 through;87849),and',chain-of-cusiody-are,in <br /> Appendix B. ` <br /> A. SUMMARY/CONCLUSIONS . <br /> :The following conclusions were drawn from the results of,this investigation: <br /> • On 06 April 1998, ground water flow direction at the site was generally toward the north. <br /> Based on data from other sites in.the'area, it is-likely that the flow direction varies seasona'lly' <br />' from northeast to northwest: <br />: Ground water elevation at the site decreased an average 1.87 feet since the last_quarterly . <br /> monitoring event <br /> Petroleum.hydrocarbons'were,detected only in wells MW-4, located offsite and down <br /> gradient (north) ofthe-former_UST excavation,-and in 1VIW-1 located hear the.former UST <br /> excavation: <br /> MTBE.was not detected in.any of the'ground'water-samples by EPA Method 8260:However, <br /> Ilow concentrations of L2-diehloroethane were detected in the sample collected from MW-1,,: <br /> as well as isopropyThenzene; napthale <br /> o ne; n-propyl-berizene, 1,2,4-trimethylbenzene; '1',3­5- <br /> as <br /> vinyl:acetate,in.the sample collected frorri MW-4: <br /> •a . Maximum contaminant levels (Iv1CLs) have-not been established forvinyl acetate. The 1.0: ' <br /> ppb 1,2-DCA detected in'MW=1 exceeds the State Department of'Health Services 0.5 ppb <br /> I :maximum contaminant-level (MCL) for'that-compound. t: ' <br /> • Oxygenated-volatile'organic•compounds were not present at detectable concentrations in any <br /> of the ground water samples. <br /> •_ In general; the'.tconcentrations of analytes.detected. in the ground ,water samples have <br /> . ""- <br /> Advanced-GeoEnvironmcntal,Inc. <br />