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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client ARCO Products Conipanv SeM#-o- Request: S9700307 <br /> Project 2169 STOCKTON/20805-146 01 O/TO#20682 00 Date Analyzed. 2/21/97 <br /> Initial Calibration Venfication(ICV) Summary <br /> BTEX .tnd Total Volatile Hydrocarbons <br /> Units mg/m3 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anahte Value Result Recovery Limits <br /> Benzene 25 <br /> Toluene 24 96 $0-120 <br /> 25 24 96 80-120 <br /> Ethvibenzenc 25 25 100 80-120 <br /> Xvlenes Total 75 70 93 80-120 <br /> Gasoline 250 240 96 80-120 <br /> MethN I tort-Blit\I Ether 25 26 104 80-120 <br /> Page 11 <br />