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Ss <br /> COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client EMCON Service Request- L9702274 <br /> Project 2 110 STOCKTON/#20805-1 14 008/T0#20791 00 Date Collected: NA <br /> LCS M,iti i. 1Iapar Date ReLeived- NA <br /> Date Extracted: NA <br /> Date Analyzed- 7/3/97 <br /> Laboratory Control Sample Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> EPA Methods 8020/Modified 8015 <br /> Units uL/L, (ppmv) <br /> CAS <br /> Percent <br /> Recovery <br /> True Recovery <br /> Acceptance <br /> Analyte Value Result Recovery Lints <br /> Benzene I0 0 110 1I0 60-140 <br /> Toluene 10 0 10 6 106 60-140 <br /> Ethvlbenzene 10 0 I0 9 109 60-140 <br /> TPH as Gasoline` 710 779 110 60-140 <br /> * TPH as gasoline Is defined as C6 (Benzene) through C12 (Dodecane) <br /> LLV121594 <br /> Page 7 <br />