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COLUMBIA ANALYTICAL SERVICES, INC i <br /> QA/QC Report <br /> Client ARCO Produos Compam Service Request- S9700500 <br /> Pioleij 21 M STOCKTON/20ti05-114 0US/TO#20791 00 Date Collu.ted• 3/20/07 <br /> Samlile Mati n Air Date RLtxived 3/21/97 <br /> Date Erti acted N/A <br /> Date Analried 3121197 <br /> Duplicate Suiuntaty <br /> BTEX mid Total Volatile Hydrocarbons <br /> Units uL/L (ppmv) <br /> Sample Namc Batcli QC <br /> Lab Code S970050 1-00 <br /> Dulilii_ate Relative <br /> Sample Sampie Percent <br /> Analvte MRL Result Result Average Difference <br /> Benzene 0l 60 50 55 17 <br /> Toluene U 1 250 230 280 8 <br /> Ethylbenzene 0l 28 25 27 9 <br /> Xylenes Total U 2 180 160 170 12 <br /> Total Volatile H1dCOCarbons <br /> C1 -05 5 1900 1300 1,200 38 <br /> CG-C12 5 3400 3400 3,400 <1 <br /> TPH as Gasoline* 5 3400 3400 3,400 <1 <br /> Note ppmV= mg/in' \ 124 45 (gas constant)/ molecular weight (MW)] <br /> MW Ben/enc= 79 Toluene= 92 Ethvibeimene= 106, Total Xylenes= 106 <br /> MW Gasoline= 100 <br /> * TPH as gasokine is defined as C6 (benzene)through C12 (dodecane)and uses,i <br /> molecular height of 100 to calculate the ppmv <br /> UI iP140u01'1 <br /> Page 8 <br />