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1 - <br /> 13 September 2001 <br />' AGE-NC Project No 95-0128 <br /> Page 6 of 7 <br />' 34 ANALYTICAL RESULTS FROM SOIL SAMPLES <br />' A total of eleven soil samples were analyzed for TPH-g, TPH-d, BTEX and MTBE <br /> • TPH-g, TPH-d, and BTEX compounds were not detected above laboratory reporting Iimits <br />' in any of the soil samples collected and analyzed <br /> • MTBE was detected In two of the soil samples collected from bonngs MTBE was detected <br /> in sample MW15-30 at 0 062 milligram per kilogram mg/kg and in sample MW16-30 at <br />' 0 063 mg/kg <br /> • Analytical results of soil samples are summanzed on Table 4 The laboratory reports (MAI <br /> Laboratory I D No 69994 to 70004), quality assurance and quality control (QA/QC) report <br /> and chain-of-custody forms are included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' The following conclusions were drawn from the results of investigation this quarter <br />' • TPH-g, TPH-d, and BTEX compounds were not detected above laboratory reporting limits <br /> in any of the soil samples collected from pilot borings MTBE was detected in the soil <br /> samples collected from thirty feet bsg from borings MW 15 and MW 16 ,these concentrations <br />' may be more reflective of impacted ground water in the pore spaces of the soil than of <br /> adsorbed MTBE <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 /> • Figures 4 depicts the dissolved MTBE isocontours <br />' 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, Iower or non-detectable concentrations in the down-gradient and cross <br /> 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 <br /> The dissolved MTBE plume has not been defined east of well MW-15 and MW-16 <br /> • <br /> i <br /> Advanced GeoEavironmental Inc <br />