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HOUSTON LABORATORY <br /> 8880HOUSTON <br /> TEXAS <br /> 77054E <br /> HOUSTON TEXAS 77054 <br /> (713)660-0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> talysis Gasoline Range Organics WorkOrder 99110007 <br /> Method CA GRO Lab Batch ID R4282 <br /> Method Blank Samples in Analytical Batch <br /> CID- - HP_R_9911038-90098 Units mg/L Lab Sample ID Client Sample ID <br /> alysis Date 11/03/1999 12 31 Analyst CJ 99110007-01A MW-6 <br /> 99110007-02A MW-1 <br /> 99110007-03A MW-3 <br /> 99110007-04A VEW-2 <br /> Analyte Result Rep Limit 99110007-05A MW-4 <br /> Gasoline Range Cr anics ND 0 050 <br /> Surr 1 4-Di luorobenzene 8381 62-144 9911 D007-06A MW-2 <br /> Surr 4-Bromotluorobenzene 91 2 44-153 99110007-07A MW-7 <br /> 99110007-08A MW-5 <br /> 99110007-09A Trip Blank <br /> ' Laboratory Control Sample(LICS <br /> RunID HP—R-991 103B-90036 Units mg/L <br /> Analysis Date 11/03119991547 Analyst CJ <br /> i <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Gasoline Range Organics 1 0 731 731 641 131 <br /> Matrix Spike MS)!Matrix Spike Duplicate MSD <br /> Sample Spiked 99110007-02 <br /> RunID HP_R_9911033 90038 Units mg/L <br /> Analysis Date 11/03/1999 10 35 Analyst CJ <br /> Analyte Sample MS MS Result MS% MSD MSD Result MSD% RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added ! <br /> VasOl,jne�RageOrganics NDI 0 9 051 57 0 091 0491 54 6 432, 36 36 160 <br /> ;Viers NDIU-Not Detected at the Reporting Limit "-Recovery Outside Advisable QC Limits _ <br /> B-Analyte detected in the associated Method Blank D-Surrogate Recovery Unreportable due to Dilution <br /> ' J-Estimated value between MDL and PQL <br /> 99110007 Page 13 <br /> 11112J9910 57 40 AM <br />