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' 08 November 2004 <br /> . AGE-NC-99-0570 <br /> Page 3 of 4 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to ground water ranged from 15 34 feet below well casing grade in well MW-3 to <br /> I 16 72 feet below well casing grade in well MW-5 (Table 1) The relative ground water elevation <br /> ranged from 9 61 to 12 40 feet below mean sea level (MSL) The top of the ground water table 4 <br /> occurred within the screened intervals of the wells Ground water was inferred to be flowing to the <br /> northwest at a significant hydraulic gradient of approximately 0 03 foot/foot(fl/ft) The ground water <br /> elevation contours are depicted on Figure 3 <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples MW-1 and MW-2 at concentrations of 240 micrograms per liter <br /> (gg/1) and 220 gg/l, respectively TPH-d was not detected in any of the samples analyzed <br /> BTEX compounds were detected in wells MW-1 and MW-2 at concentrations of 16 gg/l and 5 2µg/1 <br /> ethylbenzene, and 22 pg/1 and 2 9 gg/l xylenes, respectively r <br />' . No other target analytes were detected at or above laboratory reporting limits in any of the samples <br /> analyzed Laboratory results of water samples are summarized in Table 2 The laboratory reports <br /> (CTEL Prod ect No CT214-0410167),quality assurance/quality control(QA/QC)reports,and chain <br /> of custody forms are included in Appendix D Documents confirming the upload of laboratory <br /> electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are <br /> included in Appendix E <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> Based on the results of the October 2004 monitoring event,AGE draws the following conclusions <br /> • Ground water flow direction was towards the northwest from the former dispenser area at <br /> a hydraulic gradient of 0 030 ft/ft This flow direction and gradient are similar to previous <br /> monitoring events - <br /> • MTBE was not detected in any of the ground water samples analyzed <br /> • TPH-g was detected in monitoring wells MW-1 and MW-2 at concentrations of 240 gg/l and <br /> 220 jig/I, respectively <br /> • In the fourth quarter 2004,TPH-g,BTEX,and MTBE decreased significantly in well MW-2 <br /> r <br /> • <br /> Advanced GeoEnviron mental,Inc <br /> I <br />