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flattens noticeably between MW-10 and MW-11, due to the anomalous <br /> rise in the water level in MW-11- <br /> 4.2 Groundwater Sample Analysis <br /> Except for MW-1/5-20-93 , all water samples were ND (not detected) <br /> for all target analytes (Appendix A) . In MW-1/5-20-93 , TPH-g was <br /> detected at a concentration of 1, 500 Ag/l, benzene at 1. 1 gg/1, <br /> toluene at 2 . 1 gg/1, ethylbenzene at 53 Mg/l, and xylene at 78 <br /> Ag/l. The results indicate a large reduction in contaminant <br /> concentrations since the February monitoring event, as well as <br /> major reduction in the size of the contaminant plume (Figure 4) . <br /> 5. 0 CONCLUSIONS & RECOMMENDATIONS <br /> Groundwater contamination continues to decrease at this site. In <br /> MW-1, the concentration of TPH has decreased by 80 % and the <br /> concentration of BTE&X has decreased by 60% since GeoAudit began <br /> the monitoring program in September 1992 . The concentrations of TPH <br /> and BTE&X in all other wells are now below detection limits. The <br /> decrease in concentrations is probably due to removal of vadose- <br /> zone contaminated soil, coupled with biodegradation or other <br />. natural factors. <br /> GeoAudit recommends that the wells be monitored again in August <br /> 1993 . <br /> 6 . 0 LIMITATIONS <br /> Our professional services were performed using that degree of care <br /> and skill ordinarily exercised by environmental consultants <br /> practicing in this or similar localities. The findings were mainly <br /> based on analytical results provided by an independent laboratory. <br /> Evaluations of the geologic conditions at the site for the purpose <br /> of this investigation are made from a limited number of available <br /> data points. No other warranty, expressed or implied, is made as to <br /> the professional recommendations contained in this report. <br />• <br /> t <br /> 3 <br />