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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client 4RCO Products Compam Servll.e Request 59600163 <br /> Project 2130 Stockton/0905-114 004 / TO#18957 00 D,tte Analyzed 1/26196 <br /> Initial Calibration Verification(ICV) Summary <br /> BTEX and Total Volatile Hvdrocarbons <br /> Units mg/m3 <br /> CAS <br /> Percent <br /> Recovery <br /> Tnn PLrLLnt Acceptance <br /> Analyte Value Result Recu%er-, Limits <br /> Benzene 16 15 1 94 85-115 <br /> Toluene 16 149 93 85-115 <br /> Ethvlbenzene 16 14 1 88 85-115 <br /> Xvlenes Total 48 422 88 85-115 <br /> Gasoline 200 207 104 40-110 <br /> Note ppm\, = nig/nn' 124 4i (gas constant)/ niolecutar weight(MW)J <br /> MW Benzene = 79 Toluene = 92 Etlw1benzene= 106 Total Xtilenes = 106 <br /> MW G.uohne = 89 <br /> ILV21AVOo01o7 <br /> Page 8 <br />