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J Ethylbenzene Soil/15. 0 14 ppm Ethylbenzene Soil/20 . 0 ' 14 ppm Toluene Soil/15. 0 ' Toluene 6. 5 ppm Soil/20 . 0 ' 16 ppm Total Xylenes Soil/15 . 0 ' 120 ppm Total Xylenes Soil/20. 0 ' 95 ppm TPH-D S03.1/15. 0 ' TPH-D Soil/20. 0 ' 75ppm 54 ppm TPH-G. . .Total Petroleum Hydrocarbons as Gasoline TPH-D. . .Total Petroleum Hydrocarbons as Diesel PPm. . .Parts per million bgs• . .Below ground surface CONCLUSIONS AND RECOMMENDATIONS The soil samples acquired at depths of 15, 0 ' and 20. 0 ' bgs within boring SB-3 were moist to very moist and apparently within the capillary fringe immediately above the water table. Fuel hydro-- d1�t carbons present within these samples were in concentrations likely to be of concern, particularly if groundwater has been } -f 5� e impacted (as appears to be the case) . Figure #3 shows that (qa '"._ the blows per foot (measured at five foot intervals in eachf. � of the borings) generally decrease to the south, indicat#Zig P that the soil stiffness, or hardness, decreases to this VY direction. One may interpret this to mean that the undergroun - � � storage tanks which are known to have existed onsites may have been located at the southwestern corner of the property; and the backfill used following the excavation of these tanks is less well compacted than are the native soils. Given the concentrations of contaminants detected within boring SB-3 , and in consideration of the porosities and hydraulic conductivities typical of the clays and sands encountered in the borings advanced during Uriah ' s investigation, it is estimated that the area of soil contamination may extend across as much as one-half of the Togo 's Restaurant parking lot between 74 . 0 ' bgs and, perhaps, 25. 0 ' bgs. P In order to acquire the additional information necessary to more thoroughly define the contaminant plume, calculate the volume and types of soils impacted, and design a cost effective, efficient, and appropriate remediation system, it is ed that three additional soil borings be advancommend- ed is recommend- locations rec locations specified in Figure #2 as EB-4. EB-5, and EB-6. As requested, a review of remediation technologies is presented within Appendix "C" . 7.