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INTERIVATIOIVAL TECHNOLOGY CORPORATION Ms. Mary Maeys 4 January 15, 1996 Attachment 3 0 of this report contains Tables 1 and 2 (generated by Reidel Environmental and IT Corporation, respectively) These tables include all analytical data collected to date from Location 2 (beneath the Lindsay Street sidewalk). A total of 25 samples from this area were analyzed for BTEX concentrations. No detectable BTEX concentrations were encountered in any of the 25 samples; therefore, no BTEX modeling could be performed for Location 2 IL Contaminant Distribution Issue A How was impacted area established? r Response A Impacted areas for Location 1 and 2 were established using the soil sample analytical data collected to date. ' Location 1 - near Abandoned USTs in Buildin Basement. The impacted area ge _ - p is assumed to be 12 feet long by 6 feet wide by 6 feet deep This assumption is based on known data points, the known integrity of the tank and the typical migratory behavior of fugitive petroleum Few data points exist in the basement area, however, the concentrations immediately adjacent to the abandoned 300 gallon tank are noted to be significantly greater than concentrations encountered further away This is to be expected as a point source release will migrate only slightly in the horizontal plane. Since the tank appeared to be sound during completion of triple rinsing and abandonment procedures, significant horizontal migration is not expected. ' For calculation of the vertical fugitive diesel distribution, the base of the abandoned tank was assumed to be 5.0 feet below the basement floor The ' maximum sampling depth achieved was 9.9 feet below the basement floor. Since the area surrounding the abandoned USTs is covered by a 300 x 100 foot building, vertical migration of contaminants is stifled (no driving forces to ' vertical migration such as leaky utilities and precipitation). Therefore, an area six feet deep is assumed. ' The figure section of this report contains a plan view, a cross section location map, and a cross-sectional view of the assumed impacted area at Location I (Figures 1-3). Location 2 - Beneath the Lindsay Street Sidewalk. The impacted area is assumed to be 21 feet long x 10 feet wide x 5 feet deep. This assumption is based on known data points The figure section of this report contains a plan view, a cross section location map, and a cross-sectional view of the assumed impacted area at Location 2 (Figures 4-6).