Laserfiche WebLink
1 <br /> ' 11 August 2004 <br /> AGE-NC Project No 98-0432 <br /> ' Page 3 of 4 <br /> ' The ground water flow direction was inferred to be towards the north,at a gradient of approximately <br /> 0 0023 ft/ft near the former UST locations (Figure 3) <br /> ' 3 2 GROUND WATER ANALYTICAL RESULTS <br /> ' TPH-d and BTEX compounds were not detected in the ground water sample collected this quarter <br /> TPH-g was detected in the sample from well MW-1 with a concentration of 220 microgram per liter <br /> (µg/1) MTBE was detected in water samples MW-1 and MW-2 at concentrations of 220 µg/1 and <br /> ' 2 2 µg/l, respectively No additional petroleum hydrocarbon compounds were detected in the <br /> samples analyzed Analytical results from ground water samples are summarized in Tables 2 and 3 <br /> The laboratory reports (CTEL Project No CT214-0407042), quality assurance and quality control <br /> ' (QA/QC)reports and chain of custody forms are included in Appendix B GeoTracker confirmation <br /> pages of the submitted laboratory electronic deliverable format (EDF) files are included in <br /> Appendix C <br /> 1 T <br /> t4 0 SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> ' During the July 2004 monitoring event, ground water was 2 feet lower than the previous <br /> quarterly sampling event, the ground water flow direction was north at a gradient of <br /> ' 0 0023 ft/ft in the area of the former USTs, which was consistent with the prevailing north <br /> to northwesterly flow directions at the site <br /> i <br /> • TPH-g was detected only in sample MW-1 at a concentration of 220 µg/1 <br /> ' MTBE was detected in samples MW-1 and MW-2 The dissolved MTBE concentrations <br /> have declined consistently since initiation of ground water monitoring at the site, only the <br /> ' MTBE concentratio n well MW-1 was above the DHS' Maximum Contaminant Level of <br /> 11 llig/I <br /> 5.0. RECOMMENDATIONS <br /> ' Based on the results of this investigation,AGE recommends <br /> ' Continuation of quarterly ground water monitoring, the next monitoring event is scheduled <br /> for October 2004 <br /> • <br /> 1 < <br /> Advanced GeoEnvironmental,Inc <br />