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J. H. KLEINFELDER&ASSOCIATES 11 soil chemistry summary for the recently collected samples has been prepared (Table 2 within Appendix A). Available laboratory data (soils and ground water) including methods of analysis and detection limits are included within Appendix E. A series of soil iso—chem maps have been prepared from the available laboratory analytics and illustrate the ; occurrence and distribution of gasoline and related compounds within the vadose zone. Figures 21 through 34 show the distribution and occurrence of contaminants using contour lines of equal concentration in an areal view. Figures 35 through 38 show the distribution and occurrence of contaminants using contour lines of equal concentration in a cross—section format. Soil boring locations used in Figures 35 through 38 are shown on the Geologic Cross Section, Location Map (Figure 4). The soil iso -chem maps processed using the cross—sectional format (Figures 35 through 39) correspond in scale and location with Geologic Cross Section A—A' . i. The vertical and aerial distribution of gasoline and its associated constituents in soil are displayed on Figures 21 through 38. The L cross—sections and maps are iso—chem drawings representing the approximate i ` distri."t—ion of gasoline and associated constituents at the site. Each i soil iso—ahem drawing was generated and processed by lnteractiye Surf r r Mo lain developed by Dynamic Graphics using a Digital Equipment Corporation VAK-11/750 computer. The computes printouts were then hand i f adjusted to fit the gaologic conditions and data boundaries not included t E in thr•. computer program. These drawings (Figures 21 through 38) were i constructed using probable geologic pathways, geologic controls and data boundaries. The following scenario preser..s a probable series of events describing the migration of contamination through the soil from two point sources. The r s direction for migration of the contamination at the site is based gravity controlled pathways derived from an interpretation of the geological conditions observed at the site. The following scenario is ` only one of many interpretations that could be made from the data so far accumulated. This interpretation does not take into consideration contamination from sources cutside of the boundaries of this site. ` 53-87-443 20