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� <br /> Tier 2 Anaivsis usinq TACO Equations S17 and R26 <br /> Table 1 shows that the concentration of BTEX compounds in soii samples collected from the <br /> Huck's Convenience Store at 3595 Larkdale Court in Decatur, Illinois exceeded the Tier 1 <br /> soil remediation objectives. Similarly, Table 2 shows that the BTEX concentrations in the <br /> most recent groundwater samples collected from monitoring wells MW-4 and MW-8, and <br /> piezometer PZ-4 exceeded the Class I groundwater remediation objectives. To estimate the <br /> distance to which the contamination might be expected to migrate from these locations and <br /> thus define the limits of contamination, AET performed modeling using TACO equations S17 <br /> and R26. <br /> TABLE 1: SOIL SAMPLE ANALYSIS RESULTS (m /k ) <br /> �i Analyte Soil Soil Soi� B-2 B-3 B-14 � 8-18 <br /> ;, Cleanup Cleanup Cleanup (5 ft) ; (5 ft) (5 ft) i (7.5 ft) <br /> i � Objectives Objectives Objectives <br /> Ingestion Inhalation Migration j <br /> to GW <br /> ;i Benzene 12.0 0.8 0.03 0.33 0.9 0.11 U.36 <br /> I' Eth Ibenz. 7,800 400 13 0.2 2.5 0.088 4.5 <br /> il Toluene 16,000 650 12 0.18 1.8 0.0039 <0.065 <br /> i� X lenes 160,000 320 150 0.51 1.3 1.2 15 <br /> Bold entries (including italicized non-detects) exceed cleanup objectives for migration to groundwater. <br /> �, Analyte Soil Soil Soil #1 #2 #7 #8 <br /> li Cleanup Cleanup Cleanup (10 ft) (6 ft) (7.5 ft) (6 ft) <br /> ��; Objectives Objectives Objectives <br /> ;� I� Ingestion Inhalation Migration <br /> �� to GW <br /> � Benzene 12.0 0.8 0.03 2.7 6.8 0.14 0.48 <br /> � Eth Ibenz. 7,800 400 13 15 16 0.76 9.2 <br /> �� Toluene 16,000 650 12 5.3 14 0.82 4.8 I <br /> i; X lenes 160,000 320 150 25 13 2.3 18 <br /> ,� <br /> Bold entries (including italicized non-detects)exceed cleanup objectives for migration to groundwater <br /> TABLE 2: GROUNDWATER SAMPLE ANALYSIS RESULTS (mg/L) <br /> �� Analyte Class 1 MW-9 MW-14 MW-18 <br /> Groundwater <br /> � Cleanup <br /> �II Objectives <br /> ; <br /> �i Benzene 0.005 0.45 0.008 0.17 <br /> � Eth Ibenz. 0.7 0.36 024 0.46 <br /> i' Toluene 1.0 <0.05 <0.005 <0.5 <br /> �ii X lenes 10.0 6.4 0.66 ' 4.7 <br /> � <br /> Bold entries (including italicized non-detects) exceed cleanup objectives. <br /> The first step in the Tier 2 analysis for the migration to groundwater exposure route consists <br /> of calculating the factor for leaching from soil to groundwater using Part 742 equation S17 to <br />