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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TX 77054 <br /> Quality Control Report (713)660-0901 <br /> EXXON Company U S A <br /> uP39az 1 <br /> knalysis Volatile Organics by Method 82608 WorkOrder 01120303 <br /> Method SW8260B Lab Batch 1D R49656 <br /> Method Blank Samples in Analytical Batch <br /> lunlD K_011212A 946189 <br /> Units ug/L 1 <br /> Lab Sample ID Client Sample ID <br />�nalysis Date 12/12/2001 16 11 Analyst JC 01120303-02B MW 3 <br /> 01120303-038 MW 4 <br /> 01120303-04B MW 5 <br /> Analyte Result IRep L1mit1 <br /> Methyl tebu but I ether ND5 01 <br /> I Surr 1 2 Dichlorcethane-d4 104 0 62-130 <br /> 1 Surr 4-Bromofluorobenzene 10201 70-1301 <br /> Surr Toluene-d8 1 106 01 74-1221 <br /> Laboratory Control Sample(LCS) <br /> RunID K-01 1212A946188 Units ug/L <br /> Analysis Date 12112(2001 15 14 Analyst JC <br /> Analyte Spike I Resuit Percent Lower Upper ' <br /> I Added Recovery Limit Limit <br /> i1 1-❑ichloroethene 501 411 �82 61J 145 <br /> 1Benzene 501 511 1021 761 1271 <br /> 1Chlorobenzene 501 531 106 751 130 <br /> 1Toluene 1 50^ 541 1081 761 1251 <br />' Tnchloroethene E 50J 521 - -1041 711 120 <br /> Matrix Spiike(MSJ l Matrix Spike Duplicate(MSD) <br /> Sample Spiked 01120157-03 <br /> RunID K_011212A-946193 Units ug/L <br />' Analysis Date 12/12/2001 17 36 Analyst JC <br />' Analyte Sample MS MS Result MS% MSD 1 MSD Resuit 1 MSD% RP=Low Result Spike Recovery Spike 1` Recovery Added Added1 <br /> 1,1-Dichlorcethene NDI 25001 20001 80 2500 23001 9201 141 141 381 1721 <br /> nzene NDI 25001 26001 104 2500 26001 1041 01 11 F—6611341 <br /> iorobenzene NDI 25001 28001 112 2500 28001 2121 Ol 131 67` 1151 <br /> Totuene NDI 25001 28001 112 2500 28001 1121 OI 131 59 1251 <br /> chloroethene ND1 25001 27001 108 2500 28001 1121 41 141 61; 1341 <br /> qualifiers ND/U-Not Detected at the Reporting Limit MI -Matrix Interference <br /> 8-Analyte detected 1n the associated Method Blank D-Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL '-Recovery Outside Advisable QC Limits <br /> fThe percent recoveries for QC samples are correct as reported Due to significant figures and <br /> ounding, the reported RPD may differ from the displayed RPD values but 1s correct as reported 12/19/01 3 48 17 PM <br />