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samples. The PAHs pyrene and chrysene(PAHs)were detected in the soil sample collected from <br /> GMX-32 at concentrations of 57 and 79 mg/kg,respectively. <br /> Petroleum constituents were detected in the grab groundwater sample from boring GMX-29,which <br /> was advanced on site within the area of affected soil. Constituents quantified as TPHd were reported <br /> at 660 4g/1 in the sample when a silica gel preparation procedure was not performed and TPHd was <br /> detected at 160µg/1 following the silica gel preparation procedure). TPHd was reported at 360 WA <br /> in the aliquot that was filtered prior to extraction and analysis. These collective results indicate that <br /> much of the original TPHd quantification(660µg/t)is due to polar biogenic byproducts resulting <br /> -from intrinsic bioremediation and non-dissolved constituents adhered to particulates in the sample. <br /> TPHg was detected at a concentration of 140µg/l,benzene was detected at 0.6µgd,and TEX were <br /> detected at concentrations up to 4µg/1. Fluorene and phenanthrene were the only PAHs detected, <br /> both at concentrations of 0.1 µg/l. <br /> Grab groundwater samples from borings GMX 25,GMX-30,GMX-31 and GMX-33 were collected <br /> from locations approximately 10 to 100 feet downgradient of affected soil. Material quantified as <br /> TPHd was detected in all samples analyzed without a silica gel preparation procedure,at <br /> concentrations ranging from 86 to 560µg/1. However,TPHd was not detected in any of these <br /> samples following a silica gel Preparation procedure, indicating that the constituents detected without <br /> the silica gel preparation are polar biodegradation byproducts resulting from in situ biodegradation of <br /> the residual petroleum in soil. TPHg,benzene,ethylbenzene and PAHs were not detected in any of <br /> these samples. Low concentrations of toluene(0.8µg/1 in GMX-30)and xylenes(1.1 and 1.9 WA in <br /> GMX-30 and GMX-31,respectively)were detected. Grab groundwater analytical results are <br /> summarized in Table 2 and presented on Figure 3. The analytical laboratory reports for the sod and <br /> grab groundwater samples are presented in Appendix C. <br /> 6.0 CONCLUSIONS <br /> Based on the results of this and previous investigations,Geomatnx has developed the following <br /> conclusions about site conditions. <br /> Two areas of petroleum hydrocarbon affected soil have been identified at the site,one on <br /> the eastern portion of the property and one on the western portion of the property. Based <br /> on the results of a forensic evaluation(Geomatrix,2000), some of the soil on the castem <br /> portion of the property may be affected by degraded low-boiling-range compounds(such <br /> w gasoline)as well as high-boiling-range compounds(such as crude oil). The degraded <br /> low-boiling-range compounds may be associated with the former Mohawk gasoline <br /> station at the site. <br /> \ASF DUTDATA\nOC_WE\60DOSW 17ANT0M80SOTWWRM10VW .DOC 6 <br />