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' k9l KLEINFELDER 6 CONCLUSIONS AND RECOMMENDATIONS 6.1. Conclusions Kleinfelder conducted a soil and groundwater assessment at West Clay Properties to evaluate the presence and migration of fuel constituents Twelve (12) soil samples were collected from the borings B-1, MW-1, MW-2, and MW-3 Three (3) groundwater samples were collected from the monitoring wells located at the subject site 6.1 1 Soil Assessment • The objective of the soil assessment was to assess levels of fuel constituents in the soil around the former underground storage tank location Concentrations of TPH-Kerosene ranged from none detected to 10 mg/kg, for benzene from 0 03 to 11"mg/kg, for Toluene from none detected to 15 mg/kg, for Xylenes from none detected to 86 mg/kg, for TPH-Gasoline from none detected to 1,200 mg/kg, and for TRPH from none detected to 56 4 mg/kg 6.1.2 Groundwater Assessment There were three objectives of the groundwater assessment and sampling f fuel constituents in groundwater near the former To assess the presence o ' underground storage tank location o To assess the groundwater gradient direction and the potential groundwater flow directions • To assess the lateral extent of fuel constituent migration in groundwater, if any Concentration of the TPH-Kerosene ranged from none detected to 11,600 µg/l, for Benzene from 1 7 to 3,400 µg/l, for Toluene from none detected to 10,400 µg/1, for Ethylbenzene from none detected to 3,200 µg11, for Xylenes from none detected to 2,900 µg11, for TPH- Gasoline from 78 to 81,000 µg/i, and for TRPH from none detected to 14,400 µg/l 6.2 Recommendations Based on the results of the soil and groundwater assessment, Kleinfelder has the following recommendations 1 Further assessment of the extent of gasoline range hydrocarbons in the soil and groundwater beneath the site ETIs and WC194 Copyright 1994 Kleinfelder, Inc Page 9 of 11