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C A B R A Mr Michael Infurna • June 22, 2005 51 fbg in CPT-1 and at 2 0 ppm at 52 fbg in CPT-2 Therefore, CPT-1 and CPT-2 also delineated TPHd in soil above 60 and 58 fbg, 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 documented 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-fbg 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 fbg at 0 64 ppb Cambria's February 27, 2004 Site Investigation Report summarized this investigation Groundwater Monitoring Program There are four monitoring wells on site (S-1 through S-4) and two off-site monitoring wells (S-5 and S-6), located north of the site in Elmwood Avenue Wells S-1 through S-4 are sampled quarterly, and wells S-5 and S-6 are sampled annually dunng the first quarter During the first quarter 2005 sampling event, TPHd was detected in wells S-1, S-2, and S-3 at concentrations ranging from 150 to 2,700 ppb, however, the laboratory noted that the hydrocarbon reported was in the early diesel range and did not match the standard for diesel TPHg was also detected in wells S-1, S-2, and S-3 at concentrations ranging from 140 to 15,000 ppb Benzene was detected in wells S-1 and S-3 at 300 and 6 2 ppb, respectively Well S-3 contained 9 8 ppb 1,2-DCA No petroleum hydrocarbons or 1,2-DCA were detected in wells S-4, S-5, and S-6 SITE INVESTIGATION WORK PLAN ADDENDUM Permit Cambria will obtain an appropriate drilling permit from SJCEHD 3