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1 <br /> � t <br /> 15 May 2000 <br /> '`. <br /> AGE-NC P1oject No 95-0135 , <br /> Page 3 of 4 r <br /> � r <br /> I i (ethylbenzene m MW-1A) BTEX compounds were not detected in samples MW-3A and MW-3B <br /> t <br /> s Of the oxygenated fuel additives, only,DIPE and MTBE were detected in water samples collected <br />' this quarter DIPE was detected in wells MW-lA,MW-2A and MW-2B at concentrations of 3 0µg/l, <br /> 25 µg/l and 29µg/1, i especttvely MTBE was detected in well MW-2B at a concentration of 36 µg/l <br />'. Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report , <br /> (PET AG0330-01 to 06), Quality Control and Quality Assurance(QA/QC) and chain-of-custody at e <br /> in Appendix B <br /> 4 0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the r esults of this investigation <br />' ® On 30 Mat ch 2000 the shallow ground water flow direction at the site was generally toward <br /> the northeast and the deep gt ound water flow direction was toward the southeast Ground <br /> water elevation has di opped an avec age 1 92 feet between the December 1999 and March <br /> 2000 monitoring events <br /> O The analytical data from the lower screened casing intervals of wells MW-1 and MW-2 <br /> findicated that the highest concentratton'of dissolved hydrocarbons remains to the western <br /> portion of the site <br />' C Monitoring well MW-3 appears to` be located near the eastern margin of the dissolved <br /> hydt ocarbon plume <br /> C The lateral extent of dtssolv6d hydrocarbons is not defined to the west, south and north of i <br />' well MW-1 or south and north-of well MW-2 <br /> t <br /> G The fuel additives DIPE and MTBE were detected on the site MTBE was detected at , <br /> 1 <br /> concentrations,exceeding the State of California action level <br /> i <br /> V 1 <br /> F it �. <br /> '50. RECOMME� i nNDATIONS " <br /> s <br />' Based on the results of this and previous investigations, AGE recornmends <br /> o Continued quarterly monitoring of the site The,next monitoring event should conducted to <br /> June 2000 <br /> Additional soil borings should be installed to assess the lateral extent of hydrocarbon- <br /> I <br /> 1 <br /> 9dvanced GeoEnvironmental,Inc <br /> r <br />