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Item Evaluation Criteria Comments/Discussion Site Investigations (conk) of the hydraulic lift and below the grease trap locations were below reporting limits for all constituents analyzed Soil samples collected at the bottom of the current UST location reported maximum TPHg and benzene concentrations of 190 mg/kg and 0 59 mg/kg,respectively July 1991 Monitoring Well Installation• In July 1991, GSI advanced three soil borings to a maximum depth of 31 fbg which were completed as monitoring wells C-1 through C-3 The maximum TPHg and benzene in soil was reported at 13 mg/kg and 011 mg/kg, respectively,in C-2 at 16 fbg August 1997 Site Assessment In August 1997, Gettler Ryan Inc (G-R) advanced four soil borings, B-1 through B-4, to approximately 24 fbg No TPHg, benzene or methyl tert-butyl ether (MTBE) was reported in any soil or grab- groundwater sample y�jS��tP r -December-2005-Site Assessment- In December 2005, Cambria advanced three soil borings to define the vertical and lateral extent of hydrocarbons in soil and groundwater No TPHg or benzene was reported in any soil sample MTBE was only reported in one soil sample at a concentration of 0 003 mg/kg No TPHg or benzene was reported to any grab-groundwater sample collected MTBE was reported at concentrations ranging from non-detect to a maximum of 42 pg/L MTBE impact appears to be limited to water bearing zones at approximately 30 fbg 2 3 Soil Definition Status The primary source of hydrocarbon impact appears to be the first generation UST complex Soil was over-excavated to approximately 16 fbg Confirmation bottom samples from the former UST pit indicate maximum TPHg and benzene concentrations of 450 mg/kg and 2 4 mg/kg, respectively Soil appears defined up-gradient by soil borings B-4 and B-6, cross-gradient by monitoring well C-3 and down-gradient by soil • boring B-7 Minor amounts of h drocarbon 2