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A AYE B R 0 A Mr Nfichaellnfurna • April 6, 2005 these borings delineate these constituents in soil above 40 fbg TPHd was detected at 1 6 ppm at 51 fbg in CPT-1 and at 2 0 ppm at 52 fbg in CPT-2 Therefore, CPT-1 and CPT-2 also delineate TPHd in soil above 60 and 58 tbg, respectively Soil samples collected from well boring S-2 contained TPHg concentrations of 28 ppm at 25 fbg and 570 ppm at 30 fbg TPHg was not detected in soil collected from the other well borings No benzene or fuel oxygenates (by EPA Method 8260) were detected in soil from any of the well borings Cambria's July 14, 1998 Site Investigation Report documents these activities 2003 Site Investigation During August 2003, Cambria advanced five CPT borings (CPT-3 through CPT-7) Shallow soil samples (from 5 to 15 fbg) from the borings were analyzed for TPHd The 5-tbg samples from borings CPT-3, CPT-4, and CPT-7 contained 1 2 to 11 ppm TPHd TPHd was not detected in deeper samples, and the laboratory noted that the hydrocarbon patterns did not match the diesel standard and were unidentifiable Groundwater samples were collected from all the borings in primarily sandy zones TPHd was detected in groundwater samples from all the borings at concentrations ranging from 53 to 680 ppb The laboratory noted that none of the hydrocarbons reported as TPHd matched the laboratory's diesel standard Upon further review, the laboratory determined that the hydrocarbons • were aged gasoline TPHg was also detected in groundwater samples from all the borings at concentrations ranging from 79 to 2,000 ppb The laboratory noted that some of the hydrocarbons reported as TPHg did not match the laboratory's gasoline standard and were due to the presence of aged gasoline Benzene was detected in groundwater samples from borings CPT-4 and CPT-6 at concentrations ranging from 1 6 to 21 ppb 1,2-DCA was detected in the sample collected in boring CPT-6 at 85 tbg at 0 64 ppb Cambria's February 27, 2004 Site Investigation Report summarizes this investigation Groundwater Monitoring Program There are four inomtormg wells on site (S-1 through S-4) and two off-site monitoring wells (S-5 and S-6), located north of the subject site in Elmwood Avenue Wells S-1 through S-4 are sampled quarterly, and wells S-5 and S-6 are sampled annually during the first quarter During the third quarter 2004 sampling event, TPHd was detected in wells S-1 through S-4 at concentrations ranging from 56 to 4,500 ppb, however, the pattern generated by these samples did not match the laboratory's standard for diesel TPHg was detected in wells S-1 and S-2 at concentrations of 2,600 and 13,000 ppb, respectively Benzene was detected in well S-1 at 230 ppb, and well S-3 contained 14 ppb 1,2-DCA Wells S-5 and S-6 were not sampled during the tlurd quarter 2004 sampling event 3