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I <br />' 20 December 2001 <br /> AGE-NC Project No 95-0128 <br />' Page 8 of 9 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of investigation this quarter <br /> • The highest concentration of dissolved hydrocarbons quantified as TPH-g,TPH-d and overall <br /> BTEX compounds occurs in the areas east and northeast of the dispenser islands <br />' a The highest concentration of MTBE detected in the ground water occurs in monitoring well <br /> MW-11, which is situated in the median of Pacific Avenue High concentrations of MTBE <br />' exist in well MW-11, and lower or non-detectable concentrations in the down-gradient and <br /> cross gradient wells defined the dissolved MTBE plume toward the north and west This may <br /> indicate that the dissolved MTBE plume is detaching from the TPH/BTEX hydrocarbon <br />' plume Figures 4 depicts the dissolved MTBE isocontours <br /> • The dissolved MTBE plume has not been defined east of well MW-15 and MW-16 <br />' Ground water extraction and treatment has removed approximately 125,000 gallons of <br /> impacted ground water A total of 1 3 kg or 2 86 lbs of MTBE and 0 192 kg or 0 42 lbs of <br /> benzene have been removed from the ground water extracted <br />' 5 0 RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends <br />' 0 Continued quarterly monitoring of the ground water monitoring network <br />' 9 Continued interim ground water extraction and treatment <br /> • Assessment of the dissolved MTBE east of wells MW-15 and MW-16 <br /> 1 <br /> Advanced GeoEnvironmentai Inc <br />