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i <br /> SMITI3 - EMERY COMPANY <br /> y lirc Frill5rrvru hrdclytmi(Itf Ftslmt Laboratory L,,tandrtihtd79O4 <br /> i <br /> 781 I 351 Wa,,h rigton 130u10,ird a loAn),LkL Cahforma 90021 a (213)749 3411 a Fax (213)746-7228 <br /> P0 Bux Rtif1 5(1 FluntLr s Point Shipyard Bld1, H4 a San Francisco California 94188 a (415)330 3000 a Fix (415)330 3030 <br /> 14271,st La Palma A,LnaL a Anahum C-ihfornca 92807 a (714)693 1026 a Fax (714)693 1034 <br /> March 16, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 40681726 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4068172604 <br /> Batch No 4070602-1 <br /> Date Analyzed 03/11/94 <br /> I <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (u /E 1) (ug/1) (ug/1) % REC RANGE(%) R P D <br /> Benzene (S) ND 11 4 11 8 104 <br /> Benzene (DS) ND 11 4 12 2 107 77-120 3% <br /> Toluene (S) 1 5 11 4 11 8 91 <br /> Toluene (DS) 1 5 11 4 12 1 93 75-115 2% <br /> Ethyl Benzene (S) ND 11 4 11 9 105 <br /> Ethyl Benzene (DS) ND 11 4 12 1 106 60-130 1% <br /> Xylene (S) ND 34 2 34 2 100 <br /> Xylene (DS) ND 34 2 34 7 101 50-130 2% <br /> 5 a Spike <br /> DS — Duplicate Spike <br /> R P D Q Relative Percent Difference <br /> ND — None Detected <br /> ALL REPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OF CLIENTS AUTHORIZATION FOR PUBLICATION OF OUR REPORT CONCLUSIONS OR EX <br /> TRACTS FROM OR R€GARD$NG THEM IS RESERVED PENDING OUR WRITTEN APPROVAL AS A MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />