Laserfiche WebLink
15 November 2005 <br /> . AGE-NC Project No 04-1045 <br /> Page 3 of 4 <br /> Two or more BTEX compounds were detected in ground water samples collected from wells MW-1 <br /> through MW-3,the maximum BTEX concentrations were detected in well MW-1 at concentrations <br /> of 8,500 µg/l benzene,62,000 µg/1 toluene,7,500m pg/l ethylbenzene and 59,000 pg/1 total xylenes <br /> The fuel additives 1,2-DCA and TAME were detected in the ground water sample collected from <br /> well MW-1 at concentrations of 380 gg/1 and 150 µg11, respectively <br /> No other analytes were detected at or above laboratory reporting limits in the analyzed ground water <br /> samples The analytical results of the ground water samples collected on 04 August 2005 are <br /> summarized in Table 2 A map depicting the distribution of toluene contamination is shown on <br /> Figure 4 The laboratory report(CTELroject No CT214-0508042), QA/QC reports and chain of <br /> custody form are included in Appendixf Documents confirming the upload of laboratory electronic <br /> I deliverable format (EDF) files and depth to water measurements to GeoTracker are included in <br /> Appendix D '4M <br /> �1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IBased on the data collected from the site, AGE concludes <br /> • At the time of the August 2005 monitoring event,ground water was inferred to flow towards <br /> the southwest at a gradient of 0 001 ft/ft, which appears to be a reversal to the generally <br /> northeasterly flow in the area Due to the low hydraulic gradient at the site on 04 August <br /> I 2005, slight variations in ground water measurements or changes of recharge/discharge of <br /> the local ground water could greatly modify the inferred ground water flow direction <br /> • TPH-g was detected only in well MW-1, at a concentration of 210,000 µg/l The TPH-g <br /> concentration was the highest detected since monitoring began in November 2004 <br /> • BTEX compounds were detected in ground water samples collected from wells MW-1 <br />' through MW-3, at maximum concentrations of 8,500 pg/1 benzene, 62,000 µg11 <br /> toluene,7,500 µg/l ethylbenzene and 59,000 µg/1 total xylenes from well MW-1 <br /> I • 1,2-DCA and TAME were detected only in the ground water sample from MW-1, at <br /> concentrations of 380 pg/l and 150 µg11, respectively <br /> • The concentrations of BTEX compounds and 1,2-DCA detected in well MW-1 exceeds <br /> California DHS' Maximum Contaminant Levels for these compounds in drinking water <br /> Advanced GcoFnvironmental,Inc <br /> I <br />