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Mr Mike Infurna March 27, 2006 C A M B R I A SUMMARY OF PREVIOUS ENVIRONMENTAL WORK 1991 UST Removal and Replacement In June and July 1991, GeoStrategies Inc (GSI) observed the removal of one 5,000-gallon UST, two 10,000-gallon USTs, one 1,000-gallon used-oil UST, product lines, four hydraulic hoists, one 15-gallon fluid tank, a grease trap and an oil/water separator Soil samples collected in the former UST cavity reported maximum total petroleum hydrocarbons as gasoline (TPHg) and benzene at 450 milligrams per kilogram (mg/kg) and 2 4 mg/kg, respectively Soil samples collected at the bottom of the former used-oil UST cavity reported maximum concentrations of TPHg and benzene at 2 4 mg/kg and 0 0056 mg/kg, respectively Soil samples collected at the bottom 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 0 11 mg/kg, respectively, in C-2 at 16 fbg August 1997 Site Assessnient 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 GROUNDWATER MONITORING The site has been on a quarterly groundwater monitoring and sampling schedule since 1991 No TPHg or benzene was reported in any site well during the first quarter 2006 MTBE was reported in monitoring wells C-1 and C-2 at concentrations of 4 pg/L and 70 µg/L, respectively SUBSURFACE INVESTIGATION RESULTS The objective of this investigation was to obtain additional information and combine this with previous site information in order to develop a site conceptual model (SCM) The SCM presents the hydrogeology and the remaining petroleum hydrocarbons in soil and groundwater at the site To complete this objective, on January 25, 2006, Cambria advanced three Geoprobe0 soil borings • 2